CN106340660A - Energy supply method and system - Google Patents

Abstract

The invention discloses an energy supply method and system. The system includes: an electrolytic stack, which is used to electrolyze water with electric energy to generate electrolytic gas; a fuel cell stack, which is connected to the electrolytic stack, and is used to output electric energy according to the chemical reaction generated by the electrolytic gas; a heat exchange device, which is connected to the electrolytic stack and/or the fuel cell stack, wherein the heat exchanger is used to absorb the heat generated by the electrolysis of the electrolysis stack when it is connected to the electrolysis stack, and/or when it is connected to the fuel cell stack, absorb the heat generated by the fuel cell The heat generated by the chemical reaction of the stack; the heat supply device is connected with the heat exchanger, and is used to output heat energy by using the heat provided by the heat exchanger. The invention solves the problem of low energy conversion efficiency of the energy supply system in the related art.

Description

Energy supply method and system

technical field

The present invention relates to the field of energy, in particular to an energy supply method and system.

Background technique

The combined heat and power system (referred to as the combined heat and power system) can provide heat and electricity to the community. The combined heat and power system can use a variety of energy sources, including the use of new energy, for example, through the combination of fuel cell stacks and electrolytic hydrogen production. The integrated heat and power cogeneration system can use new energy sources such as wind energy and solar energy to perform grid-connected peak regulation on the grid. The combined heat and power system using proton exchange membrane fuel cell stacks requires hydrogen to provide energy. Hydrogen is usually stored in the form of high-pressure hydrogen. The scale of the hydrogen storage device restricts the sustainability of the discharge, and hydrogen fuel needs to be regularly replenished to the hydrogen storage device.

The schemes for providing hydrogen fuel in the combined heat and power system in the prior art mainly include:

(1) Use a reformer to convert hydrogen-rich fuel into hydrogen and provide it to the fuel cell stack. However, there are many problems in the technical solution. For example, the reformer needs to consume extra power, the circuit is complicated, and causes heat energy loss;

(2) Hydrogen is produced through the electrolysis stack, and the mains electricity is used as the source of electrolysis energy. However, this system includes electrolysis stacks and fuel cell stacks respectively, and the integration of the system is low, resulting in insufficient reliability and sustainability; the use of mains electricity as the main source of electrolysis energy results in low energy utilization efficiency of the system .

(3) Adopt the combined heat and power system of electrolysis stack and fuel cell stack integrated battery pack, integrate the electrolysis stack and fuel cell stack stack, recycle water for many times, and provide oxygen and hydrogen for supply Fuel cell stack, but its control process is more complicated, and the overall energy efficiency is lower.

Aiming at the problem of low energy conversion efficiency of the energy supply system in the related art, no effective solution has been proposed so far.

Contents of the invention

The main purpose of the present invention is to provide an energy supply method and system to solve the problem of low energy conversion efficiency of the energy supply system in the related art.

In order to achieve the above object, according to one aspect of the present invention, an energy supply system is provided. The system includes: an electrolytic stack, which is used to electrolyze water with electric energy to generate electrolytic gas; a fuel cell stack, which is connected to the electrolytic stack, and is used to output electric energy according to the chemical reaction generated by the electrolytic gas; a heat exchange device, which is connected to the electrolytic stack and/or the fuel cell stack, wherein the heat exchange device is used to absorb the heat generated by the electrolysis of the electrolysis stack when it is connected to the electrolysis stack, and/or to absorb the fuel when it is connected to the fuel cell stack The heat generated by the chemical reaction of the battery cell stack; the heat supply device is connected with the heat exchange device, and is used to output heat energy by utilizing the heat provided by the heat exchange device.

Further, the heat supply device includes: a water tank, which communicates with the heat exchange device, and is used for heating water with the heat provided by the heat exchange device.

Further, the heat exchange device includes: a condenser, communicated with the electrolysis stack and/or the fuel cell stack, and communicated with the water tank, for condensing the water vapor in the electrolysis gas and/or the exhaust gas generated by the fuel cell stack steam, wherein the water tank is used to recover condensed water, and the condensed water is water formed by condensation of water vapor in the condenser.

Further, the system further includes: a gas-water separator, connected between the condenser and the water tank, for separating condensed water and dehydrated gas, wherein the dehydrated gas is the gas obtained after condensation and dehydration of the electrolysis gas and/or tail gas.

Further, the condenser is connected with the electrolytic cell stack, and the system also includes: a compressor connected with the gas-water separator for compressing the dehydrated gas obtained after the electrolytic gas is condensed and dehydrated; a humidifier connected between the compressor and the Between the fuel cell stacks, it communicates with the water tank through the humidifier circuit, which is used to humidify the compressed gas with the water provided by the water tank through the humidifier circuit and recover unused water.

Further, the system also includes: a gas storage bottle, connected between the compressor and the humidifier, for storing compressed gas.

Further, the heat supply device further includes: a heat absorbing trap, which communicates with the heat exchange device and the water tank, and is used for heating the water by using the water provided by the water tank and the heat provided by the heat exchange device.

Further, the system also includes: a burner, which is connected to the fuel cell stack, and is used to burn the exhaust gas generated by the fuel cell stack; the heat exchange device also includes: a first heat exchanger, which is connected to the burner and the heat sink Pass, used to absorb the heat generated by the burner and provide the heat to the heat sink.

Further, the heat exchanging device also includes: a second heat exchanger, communicated with the heat absorbing sink, communicated with the electrolytic cell stack and/or the fuel cell stack, and used to absorb the heat of the electrolytic cell stack and/or the fuel cell electricity Heap heat and provide heat to the heat sink.

Further, the system further includes: an electrolysis water circuit, which communicates with the electrolysis stack and the water tank, wherein the water tank is used to provide the electrolysis stack with water required for electrolysis and recover non-electrolyzed water through the electrolysis water loop.

Further, the system also includes: a water pump, arranged in the electrolysis water circuit, for pumping the water in the water tank into the electrolysis stack.

Further, the system further includes: a cooling water circuit, which communicates with the fuel cell stack and the water tank, and the water tank is used to provide cooling water to the fuel cell stack through the cooling water circuit and recover the cooling water.

Further, the system also includes: a water replenishing device, communicated with the water tank, for replenishing water in the water tank when the water in the water tank is lower than the first threshold; and/or a drainage device, communicated with the water tank, for The water in the water tank is discharged when the water is higher than the second threshold.

In order to achieve the above purpose, according to one aspect of the present invention, an energy supply method is provided. The method includes: using electric energy to electrolyze water through an electrolytic stack to generate electrolytic gas; outputting electric energy through a fuel cell stack according to the chemical reaction of the electrolytic gas; absorbing heat generated by electrolysis of the electrolytic stack, and/or absorbing the chemical reaction of the fuel cell stack The heat generated by the reaction; the heat absorbed is used to output heat energy.

The present invention uses electric energy to electrolyze water to generate electrolytic gas through the electrolytic stack, outputs electric energy through the fuel cell stack according to the chemical reaction of the electrolytic gas, absorbs the heat generated by the electrolysis of the electrolytic stack and/or absorbs the heat generated by the chemical reaction of the fuel cell stack ; Utilize the absorbed heat to output heat energy, which solves the problem of low energy conversion efficiency of the energy supply system in the related art, and absorbs the heat generated by the electrolysis of the electrolytic stack and/or absorbs the heat generated by the chemical reaction of the fuel cell stack through the heat exchange device , thus achieving the effect of improving the energy conversion efficiency of the energy supply system.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

1 is a schematic diagram of an energy supply system according to a first embodiment of the present invention;

2 is a schematic diagram of an energy supply system according to a second embodiment of the present invention;

3 is a schematic diagram of heat exchange of an energy supply system according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a water cycle of an energy supply system according to an embodiment of the present invention; and

Fig. 5 is a flowchart of an energy supply method according to an embodiment of the present invention.

detailed description

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances for the embodiments of the application described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Embodiments of the present invention provide an energy supply system.

FIG. 1 is a schematic diagram of an energy supply system according to a first embodiment of the present invention. As shown in FIG. 1 , the system includes an electrolysis stack 10 , a fuel cell stack 20 , a heat exchange device 30 and a heat supply device 40 .

The electrolysis cell stack 10 is used to electrolyze water with electric energy to generate electrolysis gas.

The electrolysis gas produced by the electrolysis stack 10 after electrolysis of water includes at least hydrogen and oxygen, and may also include non-electrolyzed water vapor. The electrolysis gas carries a part of the heat generated by the electrolysis process.

The fuel cell stack 20 communicates with the electrolysis stack 10 and is used to output electric energy according to the chemical reaction generated by the electrolysis gas.

The fuel cell stack 20 uses hydrogen and oxygen in the electrolysis gas as the energy source of electric energy, and generates electric energy through the chemical reaction of hydrogen and oxygen. The energy supply system in this embodiment can provide electric energy to the outside, and the electric energy is the electric energy provided by the fuel cell stack 20 .

The heat exchange device 30 is in communication with the electrolysis stack 10 and/or the fuel cell stack 20, wherein the heat exchange device 30 is used to absorb the heat generated by the electrolysis of the electrolysis stack 10 when communicating with the electrolysis stack 10, and/or Or when communicating with the fuel cell stack 20, absorb the heat generated by the chemical reaction of the fuel cell stack 20.

The heat generated by the electrolysis of the electrolysis stack 10 may be the heat generated by the device itself of the electrolysis stack 10 due to the electrolysis process, or the heat carried by the electrolysis gas generated after electrolysis. The electric energy generated by the chemical reaction of the fuel cell stack 20 may be the heat generated by the fuel cell stack 20 itself due to the chemical reaction process, or the heat carried by the exhaust gas generated by the fuel cell stack 20 after the chemical reaction.

Specifically, the energy supply system provided by this embodiment can be realized in the following forms:

1) The heat exchange device 30 communicates with the electrolytic cell stack 10, and the heat exchange device 30 absorbs the heat generated by the electrolysis of the electrolytic cell stack 10. More specifically, the heat exchange device 30 communicates with the electrolytic cell stack 10 and can absorb the The heat of the device itself and/or the heat carried by the electrolysis gas generated by the absorption electrolysis stack 10;

2) The heat exchange device 30 communicates with the fuel cell stack 20, and the heat exchange device 30 absorbs the heat generated by the chemical reaction of the fuel cell stack 20. More specifically, the heat exchange device 30 communicates with the fuel cell stack 20 and may absorb The heat of the fuel cell stack 20 device itself and/or the heat carried by the tail gas produced by absorbing the chemical reaction of the fuel cell stack 20;

3) The heat exchanging device 30 communicates with the electrolytic cell stack 10 and the fuel cell stack 20, and the communication mode is shown in FIG. 20 the heat generated by the chemical reaction, wherein the heat exchange device 30 absorbs the heat generated by the electrolysis of the electrolysis stack 10 and the heat generated by the chemical reaction of the fuel cell stack 20 in the same way as the method in 1) and 2), and will not be repeated here repeat.

The heat supply device 40 communicates with the heat exchange device 30 , and is used for outputting heat energy by using the heat provided by the heat exchange device 30 .

The heat supply device 40 outputs heat energy to the outside through the heat provided by the heat exchange device 30. Optionally, the way of providing heat energy may be by providing hot water and/or hot air, using the heat absorbed by the heat exchange device 30 to heat water and/or or gas to provide thermal energy to the outside world.

The energy supply system provided by this embodiment uses electric energy to electrolyze water to generate electrolytic gas through the electrolytic cell stack 10, outputs electric energy through the fuel cell stack 20 according to the chemical reaction of the electrolytic gas, and absorbs the heat and/or absorbs the heat generated by the electrolysis of the electrolytic cell stack 10. The heat generated by the chemical reaction of the fuel cell stack 20; the absorbed heat is used to output heat energy, which solves the problem of low energy conversion efficiency of the energy supply system in the related art, and absorbs the heat generated by the electrolysis of the electrolytic stack 10 through the heat exchange device 30 and /or absorb the heat generated by the chemical reaction of the fuel cell stack 20, thereby achieving the effect of improving the energy conversion efficiency of the energy supply system.

The heat supply device 40 may include a water tank, which communicates with the heat exchange device, and is used for heating water with the heat provided by the heat exchange device. Optionally, the water tank can be an integrated constant temperature water tank.

In order to prevent too little and/or too much water in the water tank, the system may also include a water replenishing device and/or a draining device. The water filling device is connected with the water tank, and is used for replenishing water in the water tank when the water in the water tank is lower than the first threshold value; the drainage device is connected with the water tank, and is used for draining the water in the water tank when the water in the water tank is higher than the second threshold value .

When the volume of water inside the water tank is lower than V1, it is supplied with water by an external water source, and the water supply rate Q ₁ (g/s) is obtained by formula (1), wherein P _EC is the electric power of the electrolytic cell 10, V _cell is the average working voltage of 10 cells of the electrolytic stack, F is the Faraday constant, is the molecular weight of water;

$\begin{array}{cc}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; E.</span>}\mathrm{<span\; class="notranslate">\; C</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; l</span>}\mathrm{<span\; class="notranslate">\; l</span>}}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; o</span>}}& <span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; )</span>\end{array}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

When the volume of the water inside the water tank is higher than V2, the water is drained to the outside through the drain valve, and the drain rate _Q2 (g/s) is obtained by formula (2), where _PFC is the power generated by the fuel cell stack 20, V _cell is the average operating voltage of 20 fuel cell stacks, F is the Faraday constant, is the molecular weight of water;

$\begin{array}{cc}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}\mathrm{<span\; class="notranslate">\; C</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; l</span>}\mathrm{<span\; class="notranslate">\; l</span>}}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; o</span>}}& <span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; )</span>\end{array}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Through the above water replenishment and drainage control scheme, the volume of water inside the water tank can be kept between V1 and V2 at all times. The specific values of V1 and V2 can be set according to specific conditions, for example, V1 is set to 10%-25% of the volume of the water tank, and V2 is set to 75%-90% of the volume of the water tank.

The heat exchange device 30 may include a condenser, which communicates with the electrolysis stack 10 and/or the fuel cell stack 20 for condensing water vapor in the electrolysis gas and/or water in the tail gas generated by the fuel cell stack 20 Steam, the condenser can absorb the heat released when the water vapor condenses.

When the heating device 40 includes a water tank, the water tank communicates with the condenser for recovering condensed water. The condensed water is water formed by condensation of water vapor in the condenser, and the condensed water carries the heat released when the water vapor condenses.

The system may also include a gas-water separator connected between the condenser and the water tank for separating condensed water and dehydration gas, wherein the dehydration gas is the gas obtained after condensation and dehydration of electrolysis gas and/or tail gas .

The condenser communicating with the electrolytic stack 10 includes the condenser communicating only with the electrolytic stack 10 , and also including the condenser communicating with the electrolytic stack 10 and the fuel cell stack 20 . When the cooler and heater are connected to the electrolytic stack 10, the system may also include a compressor and a humidifier.

The compressor is connected with the gas-water separator, and can compress the dehydrated gas obtained after the electrolysis gas is condensed and dehydrated.

The humidifier is connected between the compressor and the fuel cell stack 20, and communicated with the water tank through the humidifier circuit. The humidifier can use the water provided by the water tank to humidify the compressed gas and recover unused water through the humidifier circuit.

The humidifier circuit can include two passages, one passage is the direction of water flow from the water tank to the humidifier, a water pump can be set on this passage to pump water from the water tank to the humidifier, and the other passage is the direction of water flow from the humidifier direction of flow to the tank.

The system may also include a gas storage bottle connected between the compressor and the humidifier for storing compressed gas.

The condenser communicating with the fuel cell stack 20 includes the condenser communicating only with the fuel cell stack 20 , and also including the condenser communicating with the fuel cell stack 20 and the electrolysis stack 10 .

When the heating device 40 includes a water tank, the system may also include an electrolytic water circuit, which communicates with the electrolytic cell 10 and the water tank, wherein the water tank is used to provide the electrolytic cell 10 with the water required for electrolysis through the electrolytic water circuit and recover non-electrolyzed water. The system may also include a water pump, which is arranged in the electrolysis water circuit and is used to pump the water in the water tank into the electrolysis stack 10 .

The system may also include a cooling water circuit, the cooling water circuit communicates with the fuel cell stack 20 and the water tank, and the water tank is used to provide cooling water to the fuel cell stack 20 through the cooling water circuit and recover the cooling water. A water pump may also be provided on the path from the water tank to the fuel cell stack 20 in the cooling water circuit to pump water from the water tank into the fuel cell stack 20 as cooling water. After the cooling water flows out from the fuel cell stack 20 , it carries the heat generated by the chemical reaction of the fuel cell stack 20 .

The heat supply device may also include a heat absorbing trap, which is in communication with the heat exchanging device and the water tank, and is used for heating the water by using the water provided by the water tank and the heat provided by the heat exchanging device.

In order to reduce exhaust emissions, the system may also include a burner, which is connected to the fuel cell stack and is used to burn the exhaust gas generated by the fuel cell stack. In order to utilize the heat generated during the combustion of exhaust gas, the heat exchange device may also include a first heat exchanger, which is in communication with the burner and the heat sink, and is used to absorb the heat generated by the burner and provide the heat to the heat sink. heat trap.

The heat exchange device 30 may also include a second heat exchanger, the second heat exchanger communicates with the heat sink, communicates with the electrolytic cell stack 10 and/or the fuel cell stack 20, and is used to absorb the heat of the electrolytic cell stack 10 And/or the heat of the fuel cell stack 20 and provide the heat to the heat sink.

Fig. 2 is a schematic diagram of an energy supply system according to a second embodiment of the present invention. This embodiment can be used as a preferred implementation manner of the above-mentioned first embodiment.

As shown in Figure 2, 001 is the electric energy input to the electrolytic cell 10, which is the new energy surplus electric energy during the valley period of the power grid, for example, electric energy, solar energy and/or wind energy, etc., during the charging period of the energy supply system as input energy. 002 is the electric energy output by the fuel cell stack 20, and the energy supply system outputs the electric energy generated by the fuel cell stack 20 during discharge. When the energy supply system is charging or discharging, heat energy can be generated. The system recovers heat energy through the heat exchange device and the water tank 41. As shown in FIG. 2, there are six heat exchange devices in this embodiment, including HE1-HE6. Preferably, the water tank 41 is an integrated constant temperature water tank, and the system provides heat energy to users in the form of hot water.

101 to 106 in Fig. 2 are the gas input and output on the anode side of the fuel cell stack 20, wherein 101 is the hydrogen (containing a certain amount of water vapor) generated by the electrolysis stack 10 through electrolysis of water; 102 is the hydrogen gas after condensation and dehydration of 101 , 102 is used for heat recovery through HE1 during condensation and heat release, and the condensed water 402 is recycled to the integrated constant temperature water tank; 103 is the hydrogen output from the hydrogen cylinder; 104 is the hydrogen (containing a certain amount of water vapor) humidified by the humidifier, and humidification requires a certain amount of water. Heat and water input, the heat and water required for humidification are supplied by the constant temperature deionized water in the integrated constant temperature water tank; 105 is the remaining hydrogen (containing a certain amount of water vapor) after the fuel cell reaction generates electricity, and condenses 105 through HE3 The heat during heat release is recovered, and the condensed water 406 is recycled to the integrated constant temperature water tank; 106 is the remaining hydrogen after condensation and dehydration, which is burned by the burner to release heat, and the heat is recovered by HE5; The heat is recovered by the cold water flow.

201-206 in Fig. 2 are the gas input and output on the cathode side of the fuel cell stack 20, wherein, 201 is the oxygen (containing a certain amount of water vapor) produced by the electrolytic stack 10 through electrolysis of water; 202 is the oxygen after condensation and dehydration, The heat is recovered through HE2, and the condensed water 403 is recycled to the integrated constant temperature water tank; 203 is the oxygen output from the oxygen cylinder, which is used as the oxidant for the fuel cell reaction, and the oxidant of the fuel cell can also be air, and 301 and 302 are the air supply process ; 204 is the oxygen and/or air (containing a certain amount of water vapor) after humidification by the humidifier. Humidification requires a certain amount of heat and moisture input, and the heat and moisture required for humidification are all carried out by the constant temperature deionized water in the integrated constant temperature water tank. supply; 205 is the remaining oxygen and/or air (containing a certain amount of water vapor) after the fuel cell reaction generates electricity, and the condensed heat is recovered through HE4, and the condensed water 407 is recycled to the integrated constant temperature water tank; 206 is the remaining after condensing and dehydrating Oxygen and/or air, exhaust.

401-409 in FIG. 2 are liquid water processes, including electrolytic reaction water, cooling water, and steam condensed water. Among them, 401 is the electrolytic water circulation loop of the electrolytic stack 10, the water required for electrolysis is provided by the deionized water inside the integrated constant temperature water tank, and the heat generated by the reaction of the electrolytic stack 10 is recovered to the integrated constant temperature water tank; 402 is the condensed water of hydrogen , recovered to the integrated constant temperature water tank; 403 is the condensed water of oxygen, which is recovered to the integrated constant temperature water tank; 404 is the water supply circuit of the cathode and anode humidifier, which realizes water supply through the integrated constant temperature water tank; 405 is the cooling water circuit of the fuel cell, which is integrated The constant temperature water tank is also used as a cooling water circulation tank; 406 is the fuel cell anode exhaust condensed water, which is recycled to the integrated constant temperature water tank; 407 is the fuel cell cathode tail gas condensed water, which is recycled to the integrated constant temperature water tank; 408 is the external water supply; External drainage.

Using the energy supply system in Fig. 2, the condensed water, the heat of electrolysis of the electrolysis stack 10, and the heat of the chemical reaction of the fuel cell stack 20 are recovered through the integrated constant temperature water tank, so as to fully utilize the energy. Compared with the system of recovering condensed water with multiple water tanks, it has the following advantages: First, it reduces the number of water tank components, liquid pumps, heat exchange devices, and control components; second, the operating temperature of the electrolytic stack 10 and the fuel cell stack 20 Similar, the two share the water tank, and seamless mode switching can be achieved when switching between charging and discharging modes, because no matter the electrolytic cell 10 or the fuel cell, the start-up process from normal temperature to normal operating temperature requires a certain amount of time. It may reach several minutes to dozens of minutes; thirdly, the heat and moisture required by the humidifier are directly obtained from the integrated constant temperature water tank, while the heat generated by the fuel cell stack 20 and the electrolytic stack 10 directly enters the integrated constant temperature water tank, The heat exchange process is directly exchanged in the integrated constant temperature water tank, which saves the heat exchange process of multiple separate heat exchange devices, and the efficiency of the heat exchange device is bound to be lower than 100%. Every time a heat exchange device is used, it will generate A certain amount of heat and energy is lost, so the design of the integrated constant temperature water tank can directly couple the heat source and the heat sink, greatly improving the efficiency of heat recovery.

Fig. 3 is a schematic diagram of heat exchange of an energy supply system according to an embodiment of the present invention. E1～E8 in Figure 3 are the heat released or absorbed by the corresponding components in the system respectively. When the energy supply system connection mode in Figure 3 is adopted, the heat represented by E1～E8 are as follows:

E4 is the heat required by the anode and cathode humidifiers of the fuel cell, which is the heat absorbed by the humidifier from the water tank 41, while E1, E2, E3, E5, E6, E7, and E8 are all electrolytic stacks 10 or fuel cell stacks 20 The heat released during the heat release process to the water tank 41. Among them, E1 is the heat released by the electrolysis stack 10 during the electrolysis reaction process of water, E5 is the heat released by the chemical reaction of the fuel cell stack 20, and both are recovered to the water tank 41, and the water tank 41 is used as the heat exchange module 1; E2 and E3 are respectively The heat released when the water vapor in hydrogen and oxygen condenses is recycled to the heat exchange module 2; E6 and E7 are the heat released when the water vapor in the anode and cathode tail gas condenses, respectively, and is recycled to the heat exchange module 3; E8 is the fuel cell anode tail gas The heat released by combustion of the remaining hydrogen is recovered to the heat exchange module 4 . The heat XE1, XE2, XE3, and XE4 recovered by heat exchange module 1, heat exchange module 2, heat exchange module 3, and heat exchange module 4 are supplied to external cold water to raise the temperature, and finally provide users with hot water at the required temperature.

Fig. 4 is a schematic diagram of a water cycle of an energy supply system according to an embodiment of the present invention. In Figure 4, W1-W9 represent the water flows of 401-409 liquid water processes respectively. When the connection mode of the energy supply system in Figure 4 is adopted, the liquid water represented by W1-W9 are as follows:

All moisture recovery and supply are carried out through the water tank 41 . W1, W4 are the required water flow of the corresponding modules of the system; W2, W3, W6, W7 are the output water flows of the corresponding modules of the system, that is, the water flow recovered by the water tank 41; W5 is the cooling water circulation flow of the fuel cell stack 20; W8 is the water tank 41 at low temperature After a certain water level, the water flow that needs to be supplied; W9 is the water flow that is discharged outside after the water tank 41 exceeds a certain water level.

The embodiment of the present invention also provides an energy supply method. It should be noted that the energy supply method in the embodiment of the present invention can be executed by the energy supply system of the present invention.

Fig. 5 is a flowchart of an energy supply method according to an embodiment of the present invention. As shown in Figure 5, the method includes the following steps:

Step S501, using electric energy to electrolyze water through the electrolysis stack to generate electrolysis gas.

In step S502, the chemical reaction generated by the fuel cell stack according to the electrolysis gas is used to output electric energy.

Step S503, absorbing the heat generated by the electrolysis of the electrolysis stack, and/or absorbing the heat generated by the chemical reaction of the fuel cell stack.

Step S504, using the absorbed heat to output thermal energy.

In the energy supply method provided in this embodiment, the electrolytic cell stack utilizes electric energy to electrolyze water to generate electrolytic gas, and the fuel cell stack generates chemical reactions according to the electrolytic gas to output electric energy, absorbing the heat generated by the electrolysis of the electrolytic cell stack and/or absorbing the fuel cell The heat generated by the chemical reaction of the stack; the absorbed heat is used to output heat energy, which solves the problem of low energy conversion efficiency of the energy supply system in the related art, and absorbs the heat generated by the electrolysis of the electrolytic stack through the heat exchange device and/or absorbs the fuel cell The heat generated by the chemical reaction of the stack has achieved the effect of improving the energy conversion efficiency of the energy supply system

It should be noted that the steps shown in the flowcharts of the accompanying drawings may be performed in a computer system, such as a set of computer-executable instructions, and that although a logical order is shown in the flowcharts, in some cases, The steps shown or described may be performed in an order different than here.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (14)

1. a kind of energy supplyystem is it is characterised in that include:

Electrolysis pile, for being electrolysed water to produce water electrolytic gas using electric energy；

Fuel cell pile, is connected with described electrolysis pile, for producing chemical reaction output electricity according to described water electrolytic gas Energy；

Heat-exchange device, is connected with described electrolysis pile and/or described fuel cell pile, wherein, described heat-exchange device For with described electrolysis pile be connected when, absorb described electrolysis pile electrolysis produce heat, and/or with described fuel When battery pile is connected, absorb the heat that described fuel cell pile chemical reaction produces；

Heating plant, is connected with described heat-exchange device, for the heat output heat energy being provided using described heat-exchange device.

2. system according to claim 1 is it is characterised in that described heating plant includes:

Water tank, is connected with described heat-exchange device, for the heat water being provided using described heat-exchange device.

3. system according to claim 2 is it is characterised in that described heat-exchange device includes:

Condenser, is connected with described electrolysis pile and/or described fuel cell pile, is connected with described water tank, for cold Coagulate the vapor in the tail gas that the vapor in described water electrolytic gas and/or described fuel cell pile produce, wherein, described water Case is used for reclaiming condensed water, and described condensed water is the water that described vapor condenses formation in described condenser.

4. system according to claim 3 is it is characterised in that described system also includes:

Moisture trap, connects between described condenser and described water tank, for separating described condensed water and dehydrated air, its In, described dehydrated air is the gas that described water electrolytic gas and/or described tail gas obtain after condensation dehydration.

5. system according to claim 4 is it is characterised in that described condenser is connected with described electrolysis pile, described System also includes:

Compressor, is connected with described moisture trap, de- for compress that described water electrolytic gas obtain after condensation dehydration Aqueous vapor body；

Humidifier, connection, between described compressor and described fuel cell pile, is connected with described water tank by humidifier loop Logical, for humidifying compressed gas and reclaiming untapped water using the water that described water tank provides by described humidifier loop.

6. system according to claim 5 is it is characterised in that described system also includes:

Gas bomb, connects between described compressor and described humidifier, for storing described compressed gas.

7. system according to claim 2 is it is characterised in that described heating plant also includes:

Heat absorption trap, is connected with described heat-exchange device and described water tank, for the water that provided using described water tank and described heat The heat water that switch provides.

8. system according to claim 7 it is characterised in that

Described system also includes: burner, is connected with described fuel cell pile, and for burning, described fuel cell pile produces Raw tail gas；

Described heat-exchange device includes: first heat exchanger, is connected with described burner and described heat absorption trap, for absorbing State the heat of burner generation and heat is supplied to described heat absorption trap.

9. system according to claim 7 is it is characterised in that described heat-exchange device also includes:

Second heat exchanger, is connected with described heat absorption trap, is connected with described electrolysis pile and/or described fuel cell pile Logical, for absorbing the described heat of electrolysis pile and/or the heat of described fuel cell pile and heat being supplied to described suction Hot trap.

10. system according to claim 2 is it is characterised in that described system also includes:

Electrolysis water loop, connection described electrolysis pile and described water tank, wherein, described water tank is used for by described electrolysis water loop The required water of electrolysis is provided and reclaims the water not being electrolysed to described electrolysis pile.

11. systems according to claim 10 are it is characterised in that described system also includes:

Water pump, is arranged in described electrolysis water loop, for the water in described water tank is pumped into described electrolysis pile.

12. systems according to claim 2 are it is characterised in that described system also includes:

Chilled(cooling) water return (CWR), connects described fuel cell pile and described water tank, and described water tank is used for by described chilled(cooling) water return (CWR) There is provided cooling water to described fuel cell pile and reclaim described cooling water.

13. systems according to claim 2 are it is characterised in that described system also includes:

Water replanishing device, is connected with described water tank, in when the water in described water tank is less than first threshold to described water tank Moisturizing；And/or

Drainage arrangement, is connected with described water tank, discharges described water tank when being higher than Second Threshold for the water in described water tank In water.

A kind of 14. energy resource supply methods are it is characterised in that include:

Produce water electrolytic gas by being electrolysed pile using electric energy electrolysis water；

Chemical reaction is produced according to described water electrolytic gas by fuel cell pile and exports electric energy；

Absorb the heat that described electrolysis pile electrolysis produces, and/or, absorb the heat that described fuel cell pile chemical reaction produces Amount；

Using the heat output heat energy absorbing.