Waste water hydrogen production and carbon dioxide capture combined fuel production system and central heating system

Abstract

The utility model discloses a waste water hydrogen production and carbon dioxide capture combined fuel production system and a central heating system. Therefore, the technical problems that purification treatment and electrolytic hydrogen production can be performed on the wastewater, and an ideal application outlet can be found for hydrogen after electrolytic hydrogen production and tail end carbon dioxide of a carbon capture utilization and storage technology can be solved. Comprising a wastewater treatment and hydrogen production system which is used for carrying out purification treatment and electrolytic hydrogen production on municipal wastewater and / or industrial wastewater and storing generated hydrogen; the carbon dioxide trapping system is used for recovering and storing carbon dioxide in the industrial flue gas; and the system for preparing methane and / or methanol through synthesis of hydrogen and carbon dioxide is used for preparing methane and / or methanol by taking the hydrogen from the wastewater treatment and hydrogen production system and the carbon dioxide from the carbon dioxide capture system as raw materials.

Description

Technical Field

[0001] The utility model relates to a system for producing methane and / or methanol by combining wastewater hydrogen production with carbon dioxide capture and a central heating system. Background Art

[0002] Municipal wastewater, industrial wastewater and industrial flue gas are the main sources of pollution emissions. Among them, industrial flue gas usually contains a large amount of carbon dioxide produced by combustion. Capturing and utilizing carbon dioxide in industrial flue gas is an important aspect of carbon emission reduction. Carbon capture, utilization and storage (CCUS) technology is the most effective and direct means of carbon emission reduction. In recent years, although CCUS technology has made great progress, it still faces challenges such as high operating costs and limited end-of-pipe consumption.

[0003] Wastewater treatment methods mainly include biological methods, electrochemical reaction (electrolysis) methods, membrane treatment methods, ion exchange methods, and evaporation crystallization methods. The biological method is to oxidize, decompose, and adsorb salts and organic matter in wastewater through the metabolism of microorganisms to remove pollutants. The electrolysis method is to remove salts from water through electrolysis. The membrane treatment method uses the difference in the selective permeability of the membrane to separate, purify, and concentrate the target substances. The ion exchange method is a method of removing salts from the raw water by exchanging anions and cations in the saline wastewater with anions and cations fixed by the ion exchange resin. The evaporation crystallization method is a method of using the principle of evaporation to evaporate water, increase the salt concentration of the wastewater, and analyze the salt.

[0004] The electrolysis method has strong adaptability to saline wastewater and high desalination efficiency, but the electrolysis method requires the use of a large number of electrolytic cells and related equipment, which are expensive. In addition, the replacement of electrodes will further increase the cost of use. Therefore, the electrolysis method has the problems of high operating costs and large floor space. On the contrary, the membrane treatment method occupies a relatively small area, but the membrane treatment method usually has high requirements for the quality of the influent water (mainly to prevent the membrane from being polluted too quickly, resulting in a rapid decrease in membrane flux). If the electrolysis method is to be combined with the membrane treatment method, the electrolysis system is often set before the membrane treatment system, so that the membrane treatment system can be used to further deeply treat the wastewater treated by the electrolysis system.

[0005] On the other hand, the electrochemical reactors that can be used for the above-mentioned electrolysis method mainly include electrocatalytic oxidation (ECO) reactor and electrocoagulation (EC) reactor. Their basic structures are similar, that is, they both include an electrolysis device and a DC power supply, and the anode and cathode of the electrolysis device are connected to the positive and negative electrodes of the DC power supply respectively. The main difference between the two is the difference in electrode materials.

[0006] Electro-Catalytic Oxidation (EO) is a process that utilizes the oxidation of the anode (usually a titanium-based metal oxide coated electrode) and / or the electric field to generate free radicals to promote the oxidation and decomposition of pollutants, thereby achieving wastewater treatment. It can be divided into direct oxidation and indirect oxidation. The direct oxidation method is to directly oxidize pollutants on the surface of the anode to achieve the purpose of removing pollution. The indirect oxidation method is to decompose water molecules through an electric field to produce oxidants such as hydroxyl radicals, which react with pollutants in the wastewater to remove pollution.

[0007] Electro-coagulation (EC) is a process in which metal ions in the anode (usually aluminum or iron electrodes) are dissolved in wastewater, and metal hydroxides are generated through hydrolysis reaction. Metal hydroxides act as flocculants to condense suspended solids and colloids in wastewater, thereby achieving the purpose of removing pollution. At the same time, hydrogen ions in the cathode are reduced to hydrogen after receiving electrons, and overflow in the form of fine bubbles, and floccules and oily substances in the wastewater float to the surface of the water through flotation.

[0008] At present, the functions of electrocatalytic oxidation technology and electrocoagulation technology are relatively simple, and the recovery and utilization of hydrogen has not been realized. If hydrogen is to be recovered, a diaphragm is often required between the anode and the cathode. The main function of the diaphragm is to prevent the mixing of the gas products of the two electrodes. The setting of the diaphragm will lead to a complex structure of the electrolysis device, increased costs, and reduced stability and ease of maintenance. If a diaphragm is not set between the anode and the cathode, the gas products of the two electrodes are mixed, and the mixed gas needs to be separated in order to recover the hydrogen, which increases the difficulty of hydrogen recovery.

[0009] At present, diaphragm materials are manufactured and used independently. The ideal diaphragm material should have the following characteristics: first, good ion conductivity, high porosity, and low resistivity; second, high gas barrier, high hydrophilicity, and high corrosion resistance; third, thin thickness, small pore size, high mechanical strength, and good dimensional stability; fourth, low cost and long service life. Currently, common diaphragms are polymer diaphragms, ceramic diaphragms, etc.

[0010] In short, there is currently no technical solution that combines wastewater hydrogen production with carbon dioxide capture, which can not only achieve wastewater purification and hydrogen production by electrolysis, but also find an ideal application outlet for the hydrogen after electrolysis and the end-point carbon dioxide of carbon capture, utilization and storage technology. Utility Model Content

[0011] The utility model aims to provide a wastewater hydrogen production and carbon dioxide capture combined fuel production system and a central heating system, so as to solve the technical problem of being able to achieve wastewater purification and hydrogen production by electrolysis while finding an ideal application outlet for the hydrogen after hydrogen production by electrolysis and the terminal carbon dioxide of carbon capture utilization and storage technology.

[0012] In the first aspect, a wastewater hydrogen production and carbon dioxide capture combined fuel production system is provided, comprising: a wastewater treatment and hydrogen production system, the wastewater treatment and hydrogen production system is used to purify municipal wastewater and / or industrial wastewater and electrolyze hydrogen production, and store the generated hydrogen; a carbon dioxide capture system, the carbon dioxide capture system is used to recover and store carbon dioxide in industrial flue gas; a hydrogen and carbon dioxide synthesis methane and / or methanol system, the hydrogen and carbon dioxide synthesis methane and / or methanol system is used to use the hydrogen from the wastewater treatment and hydrogen production system and the carbon dioxide from the carbon dioxide capture system as raw materials to prepare methane and / or methanol; wherein the wastewater treatment and hydrogen production system The system includes a first water electrolysis hydrogen production device and a hydrogen storage device, wherein the first water electrolysis hydrogen production device is a wastewater electrolysis hydrogen production device, wherein the wastewater electrolysis hydrogen production device is used to purify municipal wastewater and / or industrial wastewater and to produce hydrogen by electrolysis, and the hydrogen storage device is used to store the hydrogen produced in the wastewater treatment and hydrogen production system; wherein the wastewater electrolysis hydrogen production device includes a shell, an anode, a cathode and an exhaust structure, wherein the anode is installed in the shell and is used to oxidize the wastewater by an anode electrochemical reaction, the cathode is installed in the shell and is used to produce hydrogen by a cathode electrochemical reaction, and the exhaust structure is installed on the shell and is used to output the hydrogen produced by the cathode out of the shell.

[0013] According to an embodiment of the utility model, the wastewater treatment and hydrogen production system, the carbon dioxide capture system and the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol are respectively arranged in the same industrial park; the wastewater treatment and hydrogen production system is connected to the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol through a hydrogen transportation system, and the wastewater treatment and hydrogen production system is connected to at least one wastewater source point in the industrial park through a wastewater transportation system; the carbon dioxide capture system is connected to the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol through a carbon dioxide transportation system, and the carbon dioxide capture system is connected to at least one industrial flue gas source point in the industrial park through a flue gas transportation system.

[0014] According to an embodiment of the utility model, the wastewater treatment and hydrogen production system is arranged in a wastewater treatment plant, and the carbon dioxide capture system and the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol are respectively arranged in the same industrial park; the wastewater treatment and hydrogen production system is connected to the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol through a hydrogen transportation system, and the wastewater treatment and hydrogen production system is connected to the wastewater source point in the wastewater treatment plant through a wastewater transportation system; the carbon dioxide capture system is connected to the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol through a carbon dioxide transportation system, and the carbon dioxide capture system is connected to at least one industrial flue gas source point in the industrial park through a flue gas transportation system.

[0015] According to an embodiment of the utility model, in the wastewater treatment and hydrogen production system, the cathode is a hollow structure having a shell layer and a hollow layer, and the hollow structure has an opening; the shell layer includes a cathode layer and a diaphragm layer which are manufactured as one body and arranged from the inside to the outside; the cathode layer is a porous body with dense pores, and the porous body is used to connect a power source; the diaphragm layer is made of a diaphragm material attached to the outer surface of the cathode layer to form a diaphragm located between the cathode layer and the anode; the hollow layer provides a hydrogen output channel, and the opening outputs hydrogen through the exhaust structure.

[0016] According to an embodiment of the utility model, the exhaust structure includes a gas-liquid separator arranged on the shell, the gas-liquid separator has a gas-liquid separation chamber, and the gas-liquid separation chamber is connected to the opening; the gas-liquid separation chamber and the shell form a connector through the opening, the gas-liquid separation chamber is connected to a reflux pipeline system, and the reflux pipeline system is used to return the liquid in the gas-liquid separation chamber to the shell.

[0017] According to an embodiment of the utility model, the wastewater treatment and hydrogen production system includes a wastewater membrane filtration and concentration device, which is used to perform membrane filtration and concentration treatment on municipal wastewater and / or industrial wastewater to obtain clean water and concentrated water respectively; the wastewater electrolysis hydrogen production device is used to purify the concentrated water and produce hydrogen by electrolysis; the wastewater treatment and hydrogen production system also includes a second water electrolysis hydrogen production device, which is an alkaline water electrolysis hydrogen production device, and the second water electrolysis hydrogen production device is used to use the clean water to perform electrolysis hydrogen production.

[0018] According to an embodiment of the utility model, the wastewater membrane filtration and concentration device includes a low-pressure reverse osmosis filtration device and a high-pressure reverse osmosis filtration device, the concentrated water output end of the low-pressure reverse osmosis filtration device is connected to the input end of the high-pressure reverse osmosis filtration device, the concentrated water output end of the high-pressure reverse osmosis filtration device is connected to the input end of the first water electrolysis hydrogen production device, and the clean water output end of the low-pressure reverse osmosis filtration device is connected to the input end of the second water electrolysis hydrogen production device through a pure water preparation device.

[0019] According to an embodiment of the utility model, the wastewater membrane filtration and concentration device comprises an ultrafiltration membrane filtration device, and the output end of the ultrafiltration membrane filtration device is connected to the input end of the low-pressure reverse osmosis filtration device.

[0020] According to an embodiment of the utility model, the high-pressure reverse osmosis filtration device adopts a disc-tube reverse osmosis filtration device; the low-pressure reverse osmosis filtration device adopts a roll-type reverse osmosis filtration device.

[0021] In a second aspect, a central heating system is provided, comprising: a heating boiler and the wastewater hydrogen production and carbon dioxide capture combined fuel production system of the first aspect, wherein the methane and / or methanol produced by the wastewater hydrogen production and carbon dioxide capture combined fuel production system is the fuel of the heating boiler.

[0022] It can not only purify wastewater and produce hydrogen by electrolysis, but also find an ideal application outlet for the hydrogen produced by electrolysis and the end-use carbon dioxide of carbon capture, utilization and storage technology.

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this specification are used to assist the understanding of the present invention. The contents provided in the drawings and the related descriptions in this specification can be used to explain the present invention, but do not constitute an improper limitation on the present invention.

[0025] Figure 1 This is a schematic structural diagram of a wastewater electrolysis hydrogen production device according to an embodiment of the utility model.

[0026] Figure 2 for Figure 1 Schematic diagram of the AA section after cutting.

[0027] Figure 3 for Figure 2 A schematic diagram of the wastewater electrolysis hydrogen production device from another angle is shown.

[0028] Figure 4 for Figure 1 Schematic diagram of the cathode appearance.

[0029] Figure 5 for Figure 1 Schematic diagram of the material layer structure of the cathode.

[0030] Figure 6 It is a schematic diagram of the structure of the anode and cathode in the wastewater electrolysis hydrogen production device according to an embodiment of the utility model.

[0031] Figure 7 for Figure 6 A schematic diagram of the structure shown from another angle.

[0032] Figure 8 This is a flow chart of a method for manufacturing a cathode of a water electrolysis hydrogen production device according to an embodiment of the utility model.

[0033] Fig. 9 It is a structural schematic diagram of a wastewater treatment and hydrogen production system according to an embodiment of the utility model.

[0034] Fig.10 It is a schematic diagram of a central heating system according to an embodiment of the utility model. DETAILED DESCRIPTION

[0035] The utility model is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the utility model based on these descriptions. Before describing the utility model in conjunction with the accompanying drawings, it should be particularly noted that:

[0036] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0037] The embodiments of the utility model involved in the following description are usually only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0038] Regarding the terms and units in this specification: The terms "include", "comprises", "have" and any variations thereof in this specification and the corresponding claims and related parts are intended to cover non-exclusive inclusions. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0039] Figure 1This is a schematic structural diagram of a wastewater electrolysis hydrogen production device according to an embodiment of the utility model. Figure 2 for Figure 1 Schematic diagram of the AA section after cutting. Figure 3 for Figure 2 A schematic diagram of the wastewater electrolysis hydrogen production device from another angle is shown. Figure 4 for Figure 1 Schematic diagram of the cathode appearance. Figure 5 for Figure 1 Schematic diagram of the material layer structure of the cathode. Figure 1-Figure 5 As shown, the wastewater electrolysis hydrogen production device includes: a shell 11, an anode 12 and a cathode 13.

[0040] The anode 12 is installed in the housing 11 and is used to oxidize the wastewater through an anode electrochemical reaction.

[0041] The anode 12 here can be the same as or similar to the anode of the electrocatalytic oxidation reactor (such as a titanium-based metal oxide coating electrode).

[0042] The cathode 13 is installed in the housing 11 and is used to generate hydrogen through cathode electrochemical reaction.

[0043] The cathode 13 is a hollow structure having a shell layer 131 and a hollow layer 132 , and the hollow structure has an opening 133 .

[0044] The shell layer 131 includes a cathode layer 1311 and a diaphragm layer 1312 which are manufactured as one body and arranged from inside to outside.

[0045] The cathode layer 1311 is a porous body with dense pores, and the porous body is used to connect to a power source.

[0046] Usually, the power source is a DC power source, and the porous body is used to connect to the negative electrode of the DC power source. Meanwhile, the anode 12 is used to connect to the positive electrode of the DC power source.

[0047] The diaphragm layer 1312 is made of a diaphragm material attached to the outer surface of the cathode layer 1311 to form a diaphragm.

[0048] The hollow layer 132 provides a hydrogen output channel, and the opening 133 is used to output the hydrogen in the hollow layer 132 .

[0049] The housing 11 is provided with an exhaust structure, and the opening 133 outputs hydrogen through the exhaust structure.

[0050] The main purpose of configuring the cathode 13 to have a hollow structure having a shell layer 131 and a hollow layer 132 is to provide a hydrogen output channel through the hollow layer 132 .

[0051] The cathode layer 1311 is configured as a porous body with dense pores, thereby increasing the specific surface area of ​​the cathode layer 1311, improving the cathode electrochemical reaction efficiency, and allowing hydrogen to enter the hollow layer 132 through the pores.

[0052] Since the cathode 13 is a hollow structure having a shell layer 131 and a hollow layer 132, the hollow structure has an opening 133, the shell layer 131 includes a cathode layer 1311 and a diaphragm layer 1312 manufactured as one and arranged from the inside to the outside, the cathode layer 1311 is a porous body with dense pores, and the porous body is used to connect the power supply, and the diaphragm layer 1312 is made of a diaphragm material attached to the outer surface of the cathode layer 1311 to form a diaphragm, and the hollow layer 132 provides a hydrogen output channel, and the opening is used to output hydrogen 133. Thus, the diaphragm and the cathode are integrated. For hydrogen production by electrolysis, the separate recovery of hydrogen can be achieved and it helps to simplify the structure of the wastewater electrolysis hydrogen production device.

[0053] In addition, since the diaphragm layer 1312 is made of a diaphragm material attached to the outer surface of the cathode layer 1311 to form a diaphragm, the diaphragm layer 1312 (i.e., the diaphragm) actually also acts as a filter membrane on the outer surface of the cathode layer 1311, which can prevent particulate matter in the wastewater from entering the cathode layer 1311 through the diaphragm layer 1312 and causing clogging of the pores of the cathode layer 1311.

[0054] Optionally, the cathode layer 1311 is a porous body with dense three-dimensional interconnected pores, and the porous body is a metal porous material, thereby further increasing the specific surface area of ​​the cathode layer 1311 .

[0055] Specifically, the metal porous material may include a sintered metal porous material. The sintered metal porous material is a metal porous material formed by sintering powder and belongs to a powder metallurgy product. Based on the preparation characteristics of the sintered metal porous material, the sintered metal porous material is densely covered with three-dimensional interconnected pores.

[0056] Specifically, the metal porous material may include an intermetallic compound porous material. The intermetallic compound porous material generally has both the corrosion resistance of ceramics and the conductivity of metals, and is more suitable as a material for the cathode layer 1311 .

[0057] The metal porous material may be a nickel-based metal porous material (such as nickel foam) to ensure better hydrogen evolution performance of the cathode layer 1311 .

[0058] Optionally, the membrane material comprises an inorganic membrane. Generally speaking, an inorganic membrane is more likely to be stably combined with a metallic porous material.

[0059] Optionally, the diaphragm material may include any one of a ceramic membrane, a polymer-ceramic membrane hybrid membrane, and a nanocomposite membrane. Ceramic membranes, polymer-ceramic membrane hybrid membranes, and nanocomposite membranes are all existing electrolyte diaphragms. The ceramics therein may include alumina ceramics or silicon nitride ceramics.

[0060] Typically, the diaphragm layer 1312 itself and / or the diaphragm layer 1312 and the cathode layer 1311 may also form an asymmetric composite layer structure.

[0061] like Figure 1-Figure 5 As shown, in a specific embodiment, the hollow structure is a plate-shaped hollow structure. In this way, the cathode 13 is a cathode plate, which is convenient for installation and use in the groove-shaped housing 11.

[0062] On this basis, if Figure 4 As shown, generally speaking, the opening 133 is provided on the side wall of the plate-like hollow structure that forms the thickness of the plate-like hollow structure.

[0063] Figure 6 This is a schematic structural diagram of the anode and cathode in a wastewater electrolysis hydrogen production device according to an embodiment of the utility model. Figure 7 for Figure 6 A schematic diagram of the structure shown in another angle. Figure 6 As shown, the hollow structure is a tubular hollow structure, and the end of the tubular hollow structure is provided with the opening 133. Meanwhile, the anode 12 is a cylinder and is sleeved outside the cathode 13.

[0064] Figure 8 This is a flow chart of a method for manufacturing a cathode for a water electrolysis hydrogen production device according to an embodiment of the utility model. Figure 8 As shown, the manufacturing method of the cathode may include:

[0065] Step S1: obtaining a first powder, and placing the first powder into a pressing mold to press-form a hollow blank;

[0066] Step S2: placing the hollow blank into a heating furnace for a first sintering to obtain a sintered metal porous material, wherein the sintered metal porous material is densely covered with three-dimensional interconnected pores;

[0067] Step S3: coating the outer surface of the sintered metal porous material with a second powder, and then placing the sintered metal porous material coated with the second powder into a heating furnace for a second sintering so that the second powder forms a diaphragm layer, which is used as a diaphragm.

[0068] The manufacturing method of the cathode for the water electrolysis hydrogen production device adopts powder metallurgy. The pressing mold can adopt an isostatic pressing mold; the specific process parameters of the first sintering and the second sintering can be set according to actual needs.

[0069] like Figure 1-Figure 5 As shown, in a specific embodiment, the shell 11 is placed vertically, and the shell 11 has an electrolysis zone 111 and a flotation zone 112 arranged in sequence from bottom to top; the anode 12 and the cathode 13 are arranged in the electrolysis zone 111, and there is an air flow floating channel between the anode 12 and the cathode 13, and the air flow floating channel is used to oxidize the wastewater entering the electrolysis zone 111 by the anode 12 through the anode electrochemical reaction. The gas (such as oxygen) and / or the gas generated by the shell 11 located in the The gas generated by the aeration device 14 at the lower part of the electrolysis zone 111 is introduced into the flotation zone 112; when the air flow upward channel is used to introduce the gas generated by the aeration device 14 at the lower part of the electrolysis zone 111 in the shell 11 into the flotation zone 112, the aeration device 14 is provided at the lower part of the electrolysis zone 111 in the shell 11; the top of the flotation zone 112 is also provided with a foam cleaning mechanism 15, and the foam cleaning mechanism 15 is used to discharge the foam generated at the top of the flotation zone 112 out of the shell 11.

[0070] Specifically, a water distributor 16 is provided in the housing 11 at the lower part of the electrolysis zone 111, and the water distributor 16 is used to introduce wastewater. The water distributor 16 can be a pipe with a plurality of water outlet holes.

[0071] Specifically, the foam cleaning mechanism 15 includes an overflow weir, and the housing 11 is provided with an overflow port communicated with the overflow weir.

[0072] Therefore, the above-mentioned wastewater electrolysis hydrogen production device also serves as an air flotation device to further improve the wastewater purification treatment effect of the wastewater electrolysis hydrogen production device. Since the diaphragm layer 1312 is made of a diaphragm material attached to the outer surface of the cathode layer 1311 to form a diaphragm, the cathode layer 1311 is isolated from the air flow flotation channel by the diaphragm, and when aeration is performed through the aeration device 14, the air does not contact the hydrogen, which greatly reduces the safety hazard.

[0073] In addition, a cathode mounting interface structure 113 is disposed in the shell 11 , an input portion of the cathode mounting interface structure 113 is connected to the opening 133 via a sealing connection structure, and an output portion of the cathode mounting interface structure 113 is connected to the exhaust structure.

[0074] The exhaust structure includes a gas-liquid separator 17 arranged on the shell 11, and the gas-liquid separator 17 has a gas-liquid separation chamber, and the gas-liquid separation chamber is connected to the opening 133 (through the cathode mounting interface structure 113); the gas-liquid separation chamber 17 and the shell 11 form a connector through the opening 133, and the gas-liquid separation chamber is connected to a reflux pipeline system (not shown in the figure), and the reflux pipeline system is used to return the liquid in the gas-liquid separation chamber to the shell 11.

[0075] A mechanical stirring and / or heating device may also be provided in the gas-liquid separator 17 to promote the precipitation of hydrogen in the gas-liquid separator 17 and discharge it from the gas-liquid separator 17 .

[0076] Fig. 9 The schematic diagram of the structure of a wastewater treatment and hydrogen production system according to an embodiment of the utility model is shown in FIG. The wastewater treatment and hydrogen production system can be used as an application mode of the above-mentioned wastewater electrolysis hydrogen production device.

[0077] like Fig. 9 As shown, the wastewater treatment and hydrogen production system includes: a wastewater membrane filtration and concentration device 2, which is used to perform membrane filtration and concentration treatment on the wastewater to obtain clean water and concentrated water respectively; a first water electrolysis hydrogen production device 3, which is a wastewater electrolysis hydrogen production device, and the wastewater electrolysis hydrogen production device is used to purify the concentrated water and electrolyze hydrogen; wherein the wastewater electrolysis hydrogen production device includes a shell, an anode, a cathode and an exhaust structure, the anode is installed in the shell and is used to oxidize the wastewater through an anode electrochemical reaction, the cathode is installed in the shell and is used to generate hydrogen through a cathode electrochemical reaction, and the exhaust structure is installed on the shell and is used to output the hydrogen generated by the cathode to the shell.

[0078] In a specific embodiment, the first water electrolysis hydrogen production device 3 adopts Figure 1-Figure 5 The wastewater electrolysis hydrogen production device shown.

[0079] In an optional embodiment, the wastewater treatment and hydrogen production system includes a second water electrolysis hydrogen production device 4, which is an alkaline water electrolysis hydrogen production device, and the second water electrolysis hydrogen production device 4 is used to use the clean water to electrolyze hydrogen.

[0080] In an optional embodiment, the wastewater membrane filtration and concentration device 2 includes a low-pressure reverse osmosis filtration device 21 and a high-pressure reverse osmosis filtration device 22, the concentrated water output end of the low-pressure reverse osmosis filtration device is connected to the input end of the high-pressure reverse osmosis filtration device, and the concentrated water output end of the high-pressure reverse osmosis filtration device is connected to the input end of the first water electrolysis hydrogen production device.

[0081] In an optional embodiment, the wastewater treatment and hydrogen production system includes a second water electrolysis hydrogen production device 4, which is an alkaline water electrolysis hydrogen production device, and the clean water output end of the low-pressure reverse osmosis filtration device is connected to the input end of the second water electrolysis hydrogen production device.

[0082] In an optional implementation, the clean water output end of the low-pressure reverse osmosis filtration device is connected to the input end of the second water electrolysis hydrogen production device through a pure water preparation device.

[0083] In an optional implementation, the wastewater membrane filtration and concentration device 2 comprises an ultrafiltration membrane filtration device 23, and the output end of the ultrafiltration membrane filtration device is connected to the input end of the low-pressure reverse osmosis filtration device.

[0084] In an optional implementation, the high-pressure reverse osmosis filtration device 22 is a disc-tube reverse osmosis filtration device; and the low-pressure reverse osmosis filtration device 21 is a roll-type reverse osmosis filtration device.

[0085] In an optional embodiment, the clean water from the high-pressure reverse osmosis filtration device 22 is used for reuse or used in a second water electrolysis hydrogen production device to produce hydrogen by electrolysis.

[0086] The above wastewater treatment and hydrogen production system first performs membrane filtration and concentration treatment on the wastewater through the wastewater membrane filtration and concentration device 2 to obtain clean water and concentrated water respectively, and then purifies the concentrated water and electrolyzes hydrogen through the wastewater electrolysis hydrogen production device 3. Since the treatment amount of concentrated water is greatly reduced, the operating cost and floor space of the wastewater electrolysis hydrogen production device can be reduced. Since the wastewater electrolysis hydrogen production device has strong adaptability to saline wastewater, the desalination efficiency of the concentrated water can be ensured. The above wastewater treatment and hydrogen production system is particularly suitable for low-salt wastewater (TDS value ≤ 3000mg / L).

[0087] Fig.10 This is a schematic diagram of a centralized heating system according to an embodiment of the utility model. Fig.10 The central heating system is used for central heating of the city, and includes a heating boiler 5 and a wastewater hydrogen production and carbon dioxide capture combined fuel production system 6. The methane and / or methanol produced by the wastewater hydrogen production and carbon dioxide capture combined fuel production system 6 is the fuel of the heating boiler 5.

[0088] The wastewater hydrogen production and carbon dioxide capture combined fuel production system 6 comprises a wastewater treatment and hydrogen production system 61 , a carbon dioxide capture system 62 , and a hydrogen and carbon dioxide synthesis system 63 for producing methane and / or methanol.

[0089] The wastewater treatment and hydrogen production system 61 is used to purify municipal wastewater and / or industrial wastewater and produce hydrogen by electrolysis, and store the generated hydrogen.

[0090] The carbon dioxide capture system 62 is used to recover and store carbon dioxide in industrial flue gas.

[0091] The hydrogen and carbon dioxide synthesis methane and / or methanol system 63 is used to prepare methane and / or methanol using the hydrogen from the wastewater treatment and hydrogen production system 61 and the carbon dioxide from the carbon dioxide capture system 62 as raw materials.

[0092] In a specific embodiment, the wastewater treatment and hydrogen production system 61, the carbon dioxide capture system 62 and the hydrogen and carbon dioxide synthesis methane and / or methanol system 63 are respectively arranged in the same industrial park; the wastewater treatment and hydrogen production system 61 is connected to the hydrogen and carbon dioxide synthesis methane and / or methanol system 63 through a hydrogen transportation system, and the wastewater treatment and hydrogen production system 61 is connected to at least one wastewater source point in the industrial park (such as the wastewater output port of the factory) through the wastewater transportation system; the carbon dioxide capture system 62 is connected to the hydrogen and carbon dioxide synthesis methane and / or methanol system 63 through a carbon dioxide transportation system, and the carbon dioxide capture system 62 is connected to at least one industrial flue gas source point in the industrial park (such as the industrial flue gas emission port of the factory) through a flue gas transportation system.

[0093] The wastewater treatment and hydrogen production system 61 here specifically adopts Fig. 9 The wastewater treatment and hydrogen production system shown in the figure has a hydrogen storage device connected to the wastewater electrolysis hydrogen production device and the alkaline water electrolysis hydrogen production device at the same time, so as to recover and store the hydrogen produced by the wastewater electrolysis hydrogen production device and the alkaline water electrolysis hydrogen production device, and provide the hydrogen to the hydrogen and carbon dioxide synthesis methane and / or methanol system 63.

[0094] The carbon dioxide capture system 62 here adopts the existing carbon dioxide absorption and desorption equipment, which can recover the carbon dioxide in the industrial flue gas and store it in the carbon dioxide storage device, and provide the carbon dioxide to the hydrogen and carbon dioxide synthesis system 63 to produce methane and / or methanol.

[0095] The hydrogen and carbon dioxide synthesis system 63 for producing methane and / or methanol is also a mature equipment, which uses the hydrogen from the wastewater treatment and hydrogen production system 61 and the carbon dioxide from the carbon dioxide capture system 62 as raw materials to prepare methane and / or methanol.

[0096] In a specific embodiment, the wastewater treatment and hydrogen production system 61 is arranged in a wastewater treatment plant (such as an urban sewage treatment plant), and the carbon dioxide capture system 62 and the hydrogen and carbon dioxide synthesis methane and / or methanol system 63 are respectively arranged in the same industrial park (the industrial park is usually a factory concentration area adjacent to the wastewater treatment plant); the wastewater treatment and hydrogen production system 61 and the hydrogen and carbon dioxide synthesis methane and / or methanol system 63 are connected through a hydrogen transportation system, and the wastewater treatment and hydrogen production system 61 is connected to the wastewater source point in the wastewater treatment plant through a wastewater transportation system; the carbon dioxide capture system 62 and the hydrogen and carbon dioxide synthesis methane and / or methanol system 63 are connected through a carbon dioxide transportation system, and the carbon dioxide capture system 62 is connected to the industrial flue gas source point in the industrial park through a flue gas transportation system.

[0097] It can be seen that the above-mentioned centralized heating system actually becomes a centralized wastewater and industrial flue gas treatment point in industrial parks or cities. It can not only purify wastewater and produce hydrogen by electrolysis, but also find an ideal application outlet for the hydrogen produced by electrolysis and the end-use carbon dioxide of carbon capture, utilization and storage technology.

[0098] The oxygen generated by water electrolysis during the operation of the wastewater treatment and hydrogen production system 61 can also be recovered separately. The recovered oxygen can be provided to the heating boiler 5 for auxiliary combustion. The carbon dioxide generated after the heating boiler 5 is burned can also be recovered by the carbon dioxide capture system 62, thereby achieving recycling.

[0099] The above is a description of the relevant contents of the utility model. A person skilled in the art will be able to implement the utility model based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of patent protection.

Claims

1. Wastewater hydrogen production and carbon dioxide capture combined fuel production system, characterized by: include: A wastewater treatment and hydrogen production system, which is used to purify municipal wastewater and / or industrial wastewater and produce hydrogen by electrolysis, and store the generated hydrogen; A carbon dioxide capture system, wherein the carbon dioxide capture system is used to recover and store carbon dioxide in industrial flue gas; A system for synthesizing methane and / or methanol by hydrogen and carbon dioxide, wherein the system for synthesizing methane and / or methanol by hydrogen and carbon dioxide is used to prepare methane and / or methanol using hydrogen from the wastewater treatment and hydrogen production system and carbon dioxide from the carbon dioxide capture system as raw materials; The wastewater treatment and hydrogen production system comprises a first water electrolysis hydrogen production device and a hydrogen storage device, wherein the first water electrolysis hydrogen production device is a wastewater electrolysis hydrogen production device, and the wastewater electrolysis hydrogen production device is used to purify municipal wastewater and / or industrial wastewater and to produce hydrogen by electrolysis, and the hydrogen storage device is used to store the hydrogen produced in the wastewater treatment and hydrogen production system; The wastewater electrolysis hydrogen production device comprises a shell, an anode, a cathode and an exhaust structure. The anode is installed in the shell and is used to oxidize the wastewater through an anode electrochemical reaction. The cathode is installed in the shell and is used to generate hydrogen through a cathode electrochemical reaction. The exhaust structure is installed on the shell and is used to output the hydrogen generated by the cathode out of the shell.

2. The wastewater hydrogen production and carbon dioxide capture combined fuel production system according to claim 1, characterized in that: The wastewater treatment and hydrogen production system, the carbon dioxide capture system and the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol are respectively arranged in the same industrial park; the wastewater treatment and hydrogen production system is connected to the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol through a hydrogen transportation system, and the wastewater treatment and hydrogen production system is connected to at least one wastewater source point in the industrial park through a wastewater transportation system; the carbon dioxide capture system is connected to the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol through a carbon dioxide transportation system, and the carbon dioxide capture system is connected to at least one industrial flue gas source point in the industrial park through a flue gas transportation system.

3. The wastewater hydrogen production and carbon dioxide capture combined fuel production system according to claim 1, characterized in that: The wastewater treatment and hydrogen production system is arranged in a wastewater treatment plant, and the carbon dioxide capture system and the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol are respectively arranged in the same industrial park; the wastewater treatment and hydrogen production system is connected to the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol through a hydrogen transportation system, and the wastewater treatment and hydrogen production system is connected to a wastewater source point in the wastewater treatment plant through a wastewater transportation system; the carbon dioxide capture system is connected to the hydrogen and carbon dioxide synthesis system for producing methane and / or methanol through a carbon dioxide transportation system, and the carbon dioxide capture system is connected to at least one industrial flue gas source point in the industrial park through a flue gas transportation system.

4. The wastewater hydrogen production and carbon dioxide capture combined fuel production system according to claim 1, 2 or 3, characterized in that: In the wastewater treatment and hydrogen production system, the cathode is a hollow structure having a shell layer and a hollow layer, and the hollow structure has an opening; the shell layer includes a cathode layer and a diaphragm layer which are manufactured as one body and arranged from the inside to the outside; the cathode layer is a porous body with dense pores, and the porous body is used to connect a power source; the diaphragm layer is made of a diaphragm material attached to the outer surface of the cathode layer to form a diaphragm located between the cathode layer and the anode; The hollow layer provides a hydrogen output channel, and the opening outputs hydrogen through the exhaust structure.

5. The wastewater hydrogen production and carbon dioxide capture combined fuel production system as claimed in claim 4, characterized in that: The exhaust structure includes a gas-liquid separator arranged on the shell, the gas-liquid separator has a gas-liquid separation chamber, and the gas-liquid separation chamber is connected to the opening; the gas-liquid separation chamber and the shell form a connector through the opening, the gas-liquid separation chamber is connected to a reflux pipeline system, and the reflux pipeline system is used to return the liquid in the gas-liquid separation chamber to the shell.

6. The wastewater hydrogen production and carbon dioxide capture combined fuel production system according to claim 1, 2 or 3, characterized in that: The wastewater treatment and hydrogen production system includes a wastewater membrane filtration and concentration device, which is used to perform membrane filtration and concentration treatment on municipal wastewater and / or industrial wastewater to obtain clean water and concentrated water respectively; the wastewater electrolysis hydrogen production device is used to purify the concentrated water and produce hydrogen by electrolysis; the wastewater treatment and hydrogen production system also includes a second water electrolysis hydrogen production device, which is an alkaline water electrolysis hydrogen production device, and the second water electrolysis hydrogen production device is used to use the clean water to perform electrolysis hydrogen production.

7. The wastewater hydrogen production and carbon dioxide capture combined fuel production system as claimed in claim 6, characterized in that: The wastewater membrane filtration and concentration device comprises a low-pressure reverse osmosis filtration device and a high-pressure reverse osmosis filtration device, wherein the concentrated water output end of the low-pressure reverse osmosis filtration device is connected to the input end of the high-pressure reverse osmosis filtration device, the concentrated water output end of the high-pressure reverse osmosis filtration device is connected to the input end of the first water electrolysis hydrogen production device, and the clean water output end of the low-pressure reverse osmosis filtration device is connected to the input end of the second water electrolysis hydrogen production device via a pure water preparation device.

8. The wastewater hydrogen production and carbon dioxide capture combined fuel production system as claimed in claim 7, characterized in that: The wastewater membrane filtration and concentration device comprises an ultrafiltration membrane filtration device, and the output end of the ultrafiltration membrane filtration device is connected to the input end of the low-pressure reverse osmosis filtration device.

9. The wastewater hydrogen production and carbon dioxide capture combined fuel production system according to claim 7, characterized in that: The high-pressure reverse osmosis filtration device adopts a disc-tube reverse osmosis filtration device; the low-pressure reverse osmosis filtration device adopts a roll-type reverse osmosis filtration device.

10. Central heating system, characterized in that: include: Heating boilers; as well as According to the wastewater hydrogen production and carbon dioxide capture combined fuel production system as described in any one of claims 1 to 9, methane and / or methanol produced by the wastewater hydrogen production and carbon dioxide capture combined fuel production system is the fuel of the heating boiler.

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