TECHNICAL FIELD

[ 0001 ] The application relates to the technical field of waste water recovery, in particular to a waste water recovery system .

BACKGROUND ART

[ 0002 ] The hydrogen production by water electrolysis is a mature way for preparing hydrogen gas , and has the characteristics of green and environmental protection, flexible production, realization of large-scale distributed utilization, high hydrogen gas purity and the like .

[ 0003 ] However, in the process of hydrogen production by water electrolysis , the electrolytic cell forms a set with the gas-water separator . A small amount of water vapor is contained in the gas separated by the gas-water separator . Water drops are captured via the water-drop trapping net of the gas-water separator . The captured water drops accumulate at the bottom of the gas-water separator . For example , a small amount of electrolytic alkali liquor is contained in the waste water discharged from the alkaline water electrolysis hydrogen production system . If the waste water is directly discharged, the environment would be polluted, so that the waste water needs to be collected, stored and treated periodically . However, not only a storage space needs to be designed for this purpose , but also the subsequent waste water treatment also needs an investment of huge cost .

[ 0004 ] Accordingly, there is a need to ameliorate one or more of the problems presented in the related technical solutions described above .

[ 0005 ] It is noted that this section is intended to provide a background or context to the embodiments of the disclosure that are recited in the claims . The description herein is not admitted to be prior art by inclusion in this section .

SUMMARY OF THE INVENTION

[ 0006 ] An obj ect of this invention is to provide a waste water recovery system, which realizes the collection and recovery of the waste water that is produced at the waste drain of the gas-water separator in the hydrogen production system by water electrolysis , so as to reuse the same as the raw materials water electrolysis .

[ 0007 ] The purpose of the invention is realized by adopting the following technical solutions :

[ 0008 ] The invention provides a waste water recovery system, which is applied to hydrogen production system by water electrolysis , and the waste water recovery system includes :

[ 0009 ] a liquid storage device , which is in communication with the hydrogen production system by water electrolysis , so as to store the waste water discharged by a gas-water separator of the hydrogen production system by water electrolysis ;

[ 0010 ] a liquid level gauge , which is provided on the liquid storage device to acquire liquid level information in the liquid storage device ;

[ 0011 ] a liquid pumping device , which is connected with the liquid storage device and is used for transporting the waste water in the liquid storage device to a water replenishing port of the hydrogen production system by water electrolysis through a pipeline ;

[ 0012 ] a switching device, which is provided on the pipeline and is used for controlling the on-off of the pipeline ; and

[ 0013 ] a non-return device , which is provided on the pipeline between the liquid pumping device and the switching device so as to prevent the waste water in the pipeline from flowing back towards the liquid pumping device .

[ 0014 ] In some optional embodiments , the waste water recovery system further comprises a controller communicatively coupled to the liquid level gauge to obtain liquid level information of the liquid level gauge, the controller is communicatively coupled to the liquid pumping device and the switching device to control operation of the liquid pumping device and the switching device .

[ 0015 ] In some optional embodiments , a sending module is provided on the liquid level gauge , and the sending module is used to send liquid level information to the controller .

[ 0016 ] In some optional embodiments , the liquid storage device comprises a water seal tank, a liquid inlet is provided at a preset position on the side wall of the water seal tank, the liquid inlet is in communication with a sewage discharge outlet of the gaswater separator in the hydrogen production system by water electrolysis , and a liquid outlet is provided at the lower end of the water seal tank .

[ 0017 ] In some optional embodiments , an exhaust gas port is provided at the top of the water seal tank, and an overflow port is provided at the upper end of the side wall .

[ 0018 ] In some optional embodiments , the liquid pumping device comprises a plunger pump, and the liquid inlet end of the plunger pump is connected with the liquid outlet of the water seal tank .

[ 0019 ] In some optional embodiments , the switching device comprises a pneumatic ball valve that opens when the liquid pumping device is activated and closes when the liquid pumping device stops .

[ 0020 ] In some optional embodiments , the hydrogen production system by water electrolysis comprises a water replenishing device , and the water replenishing device is connected with a water replenishing port of the hydrogen production system by water electrolysis ; the waste water recovery system further comprises a controller, wherein the controller is respectively communicatively connected with the liquid level gauge and the water replenishing device so as to acquire liquid level information of the liquid level gauge in real time and control one of the waste water recovery system and the water replenishing device to replenish water to a water replenishing port of the hydrogen production system by water electrolysis .

[ 0021 ] In some optional embodiments , the water replenishing port of the hydrogen production system by water electrolysis is connected with the water replenishing device and the pipeline through a t-branch pipe . [ 0022 ] In some optional embodiments , the non-return device is a non-return valve .

[ 0023 ] Compared with the prior art, the beneficial effects of this application include at least : by means of the sequential provision of the liquid storage device , the liquid level gauge , the liquid pumping device , the non-return device and switching device outside the hydrogen production system by water electrolysis , and firstly by means of buffering the waste water flowing from the gas-water separator of the hydrogen production system by the liquid storage device , and of carrying out liquid level monitoring in real time by the liquid level gauge that is provided on the liquid storage device , so that when the liquid level reaches an upper limit or a lower limit , the liquid pumping device is controlled to start or stop to transport the waste water in the liquid storage device through the pipeline to the water replenishing port of hydrogen production system by water electrolysis , thereby realizing the recovery and reuse of the waste water . By virtue of such device , the pollution caused by waste water discharged from hydrogen production by water electrolysis to the environment can be reduced, and the resulted cost of sewage treatment can be substantially reduced .

DRAWINGS DESCRIPTION

[ 0024 ] Fig . 1 is a schematic structural diagram of a waste water recovery system according to an embodiment of the present invention .

[ 0025 ] Fig . 2 is an enlarged schematic structural diagram of the liquid storage device of fig . 1 . [0026] In the drawings: 100. a hydrogen production system by water electrolysis; 101. a gas-water separator; 102. a water replenishing port; 200. a liquid storage device; 201. a liquid inlet; 202. a liquid outlet; 203. an exhaust gas port; 204. an overflow port; 300. a liquid level gauge; 400. a liquid pumping device; 500. a pipeline; 600. a non-return device; 700. a switching device .

DETAILED EMBODIMENTS

[0027] Exemplary embodiments will now be described more comprehensively with reference to the accompanying drawings. Exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus repetitive description thereof will be omitted.

[0028] The words used in this application to describe positions and orientations are provided by way of example in the drawings, but can be modified as required and are intended to be encompassed by the protection scope of the present application.

[0029] Referring to fig. 1, the embodiment of the present application provides a waste water recovery system, which is applied to a hydrogen production system 100 by water electrolysis, and which waste water recovery system includes: a liquid storage device 200, a liquid level gauge 300 , a liquid pumping device 400 , a switching device 700 and a non-return device 600 .

[ 0030 ] The liquid storage device 200 is in communication with the hydrogen production system 100 by water electrolysis to store the waste water discharged by the gas-water separator 101 of the hydrogen production system 100 by water electrolysis ; the liquid level gauge 300 is provided on the liquid storage device 200 to acquire liquid level information in the liquid storage device 200 ; the liquid pumping device 400 is connected with the liquid storage device 200 and is used for transporting the waste water in the liquid storage device 200 to the water replenishing port 102 of the hydrogen production system 100 by water electrolysis through a pipeline 500 ; the switching device 700 is provided on the pipeline 500 and is used for controlling the on-off of the pipeline 500 ; the non-return device 600 is provided on the pipeline 500 between the liquid pumping device 400 and the switching device 700 to prevent the waste water in the pipeline 500 from flowing back toward the liquid pumping device 400 .

[ 0031 ] Specifically, the gas-water separator 101 in the hydrogen production system 100 by water electrolysis would discharge the condensed waste water regularly . The condensed waste water enters the liquid storage device 200 through the pipeline 500 to be buffered . The liquid level gauge 300 provided in the liquid storage device 200 monitors the liquid level in the liquid storage device 200 in real time . When the liquid level reaches the upper limit or the lower limit , the liquid level gauge 300 sends a remote transmission signal , and the remote transmission signal can be directly sent to the liquid pumping device 400 and the switching device 700 of the next-stage treatment, or the remote transmission signal can also be sent to the controllers connected with the liquid pumping device 400 and the switching device 700 , without any limitation at this point . It should be noted that the remote transmission signal may be a start signal or a stop signal , or may be a signal for liquid level value . The liquid pumping device 400 controls the liquid pumping operation to start or stop when receiving a start signal or a stop signal transmitted from the liquid level gauge 300 .

[ 0032 ] More specifically, when the liquid pumping device 400 is started, the switching device 700 at the subsequent stage of the liquid pumping device 400 controls the opening of the liquid pumping pipeline 500 , so that the waste water in the liquid storage device 200 is transported to the water replenishing port 102 of the hydrogen production system 100 by water electrolysis through the pipeline 500 . Furthermore , to prevent waste water in the pipeline 500 from flowing back into the liquid pumping device 400 , a non-return device 600 , which, in one example , is a check/non-return valve , is provided at the pipeline 500 between the liquid pumping device 400 and the switching device 700 proximate the switching device 700 . The non-return valve is mainly a valve that is autonomously opened or closed by the force of medium flowing to prevent the medium from flowing backwards , and the specific structure can be understood by referring to the prior art , and is not described herein in detail again . [ 0033 ] The technical scheme has the advantages that by means of the sequential provision of the liquid storage device 200 , the liquid level gauge 300 , the liquid pumping device 400 , the non-return device 600 and the switching device 700 outside the hydrogen production system 100 by water electrolysis , and firstly by means of buffering the waste water flowing from the gas-water separator 101 of the hydrogen production system 100 by water electrolysis by the liquid storage device 200 , and of carrying out liquid level monitoring in real time by the liquid level gauge 300 that is provided on the liquid storage device 200 , so that when the liquid level reaches the upper limit or the lower limit, the liquid pumping device 400 is controlled to start or stop, to transport the waste water in the liquid storage device 200 through the pipeline 500 to the water replenishing port 102 of the hydrogen production system 100 by water electrolysis , thereby realizing the recovery and reuse of the waste water . By virtue of such device , the pollution caused by waste water discharged from the hydrogen production by water electrolysis to the environment can be reduced, and the resulted cost of sewage treatment can be substantially reduced .

[ 0034 ] For example , in one embodiment , the waste water recovery system further comprises a controller communicatively coupled to the liquid level gauge 300 to obtain liquid level information of the liquid level gauge 300 . The controller is communicatively coupled to the liquid pumping device 400 and the switching device 700 to control operation of the liquid pumping device 400 and the switching device 700 . Specifically, the controller is in communication connection with the liquid level gauge 300 , the liquid pumping device 400 and the switching device 700 respectively, and the controller can acquire liquid level information sent by the liquid level gauge 300 in real time . The liquid level information can be specifically a liquid level value . The controller compares the liquid level value with a threshold value to j udge whether to send a start or stop instruction to the liquid pumping device 400 and the switching device 700 . The configuration of the controller is such that various instruction information can be shared in time conveniently, and the response speed of each device is improved .

[ 0035 ] For example , in one embodiment , the liquid level gauge 300 is provided with a sending module thereon, and the sending module is used for sending liquid level information to the controller . Specifically, the sending module on the liquid level gauge 300 may be wire-connected by a controller, or may be connected by wireless communication, which is not limited herein .

[ 0036 ] For example, in one embodiment, as shown in fig . 2 , the liquid storage device 200 includes a water seal tank . A liquid inlet 201 is provided at a predetermined position on a side wall of the water seal tank . The liquid inlet 201 is in communication with a sewage outlet of the gas-water separator 101 in the hydrogen production system 100 by water electrolysis . A liquid outlet 202 is disposed at a lower end of the water seal tank . Specifically, the liquid inlet 201 is disposed at a position on the side wall of the water seal tank and lower at the water seal tank for the waste water of the gas-water separator 101 in the hydrogen production system 100 by water electrolysis to flow in . The liquid outlet 202 is provided at the lower end of the water seal tank for the waste water in the liquid storage device 200 to flow into the liquid pumping device 400 at the next stage . In one example, the water seal tank is open with an air outlet 203 at the upper part and an overflow port 204 at the upper end of the side wall . Specifically, the hydrogen production system 100 by water electrolysis is generally a pressure type water electrolysis system, and the exhaust gas port 203 and the overflow port 204 provided by the water seal tank are in communication with the atmosphere . The hydrogen production system 100 by water electrolysis can discharge the waste water generated from condensation into the water seal tank for storage via the pressure from itself . When the liquid storage amount in the water seal tank reaches the upper limit set by the liquid level gauge 300 , the liquid level gauge 300 gives a signal , and the liquid pumping device 400 is activated and starts to operate . The configuration of the exhaust gas port 203 and the overflow port 204 can ensure the safety and reliability of the whole waste water recovery system during the operation process .

[ 0037 ] For example , in one embodiment , the liquid pumping device 400 comprises a plunger pump . The liquid inlet end of the plunger pump is connected with the liquid outlet 202 of the water seal tank . Specifically, the plunger pump is required to be able to overcome the pressure of the hydrogen production system 100 by water electrolysis itself , so as to recover the waste water generated from condensation into the hydrogen production system 100 by water electrolysis , to avoid the condensed waste water from being discharged to the outside to affect the environment, and to reduce the cost of establishing a storage device for storing the waste water .

[ 0038 ] For example , in one embodiment , the switching device 700 includes a pneumatic ball valve that opens when the liquid pumping device 400 is activated and closes when the pumping device 400 stops . Specifically, the pneumatic ball valve is a ball valve fitted with a pneumatic actuator . The pneumatic actuator is in communication connection with the controller due to the fact that the execution speed of the pneumatic actuator is relatively high, so that the pneumatic actuator can execute after receiving an instruction sent by the controller, and that the on-off efficiency of the control pipeline 500 is improved .

[ 0039 ] For example , in one embodiment , the hydrogen production system 100 by water electrolysis comprises a water replenishing device connected with a water replenishing port 102 of the hydrogen production system 100 by water electrolysis ; the waste water recovery system further comprises a controller, and the controller is in communication connection with the liquid level gauge 300 and the water replenishing device respectively so as to acquire liquid level information of the liquid level gauge 300 in real time and control one of the waste water recovery system and the water replenishing device to replenish water to the water replenishing port 102 of the hydrogen production system 100 by water electrolysis . Specifically, the controller controls the water replenishing device to stop replenishing water when the waste water recovery system operates by acquiring the liquid level information of the liquid level gauge 300 in real time , so as to avoid the simultaneous operation of condensation-generated waste water recovery and normal water replenishing and the influence on the hydrogen production system 100 by water electrolysis .

[ 0040 ] For example, in one embodiment , the water replenishing port 102 of the hydrogen water electrolysis production system 100 is connected with the water replenishing device and the pipeline 500 through a T- branch pipe . Specifically, the scrubber water replenishing port 102 of the water electrolysis hydrogen production system 100 is in communication with a pipeline 500 , and in order to combine the pipeline 500 where the water replenishing device and the pneumatic ball valve are located into this pipeline 500 , a T-branch pipe is provided among the three .

[ 0041 ] Although embodiments of the present application have been shown and described, it is understandable that the above embodiments are exemplary and should not be construed as limiting the present application, and that those skilled in the art can make changes , modifications , substitutions and alterations to the above embodiments without departing from the principle and purpose of the present application, and all such changes should fall within the protection scope of the claims of the present application .