A gas stove gas supply system for combustion of mixed ammonia and its operation method

Abstract

The present invention relates to a gas stove gas supply system for mixed ammonia combustion and an operation method thereof, the system comprises an air injection system, an ammonia injection system, a gas injection system and a gas mixing and pressurizing system; wherein the air injection system is composed of an air inlet and an air chamber; the ammonia injection system and the gas injection system are both composed of a pipeline, a nozzle and a mixed gas contraction section; the gas mixing and pressurizing system is composed of a mixed gas straight section and a mixed gas expansion section; the ammonia injection system and the gas injection system are both connected to the gas mixing and pressurizing system. The present invention can realize the single combustion or mixed combustion of ammonia in a gas stove device, reduce the consumption of gas, and thus reduce the fossil energy consumption and CO2 emission in the combustion of the gas stove. At the same time, the gas stove can burn gas, ammonia, and a mixed gas of gas and ammonia at the same time through the optimization of the gas supply system.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas stove gas supply, and in particular relates to a gas stove gas supply system for combustion of mixed ammonia gas and an operating method thereof. Background Art

[0002] With the increasing amount of CO2 emissions in the industrial process, the greenhouse effect has become increasingly serious, causing the average temperature of the earth to rise and bringing more and more extreme weather. This has forced people to develop new energy, reduce greenhouse gas emissions, gradually replace traditional energy, and carry out energy conservation and emission reduction work in various fields.

[0003] Ammonia, as a carbon-free clean energy, can be produced through renewable energy sources such as wind power and photovoltaic power generation, thereby achieving greenness in the entire process of ammonia production and supply. Using ammonia as fuel can achieve clean and carbon-free processes in the entire process of ammonia preparation, storage, transportation and use, which plays a very important role in reducing CO2 emissions and achieving clean energy supply.

[0004] As a form of energy utilization in residents' lives, gas stoves consume a large amount of high-quality natural gas or liquefied petroleum gas. In addition, during the use of gas stoves, a certain amount of CO2 is emitted after the gas is burned, which has a negative impact on the environment. Reducing conventional energy consumption in residents' lives and reducing the use of natural gas can reduce dependence on natural gas resources and accordingly reduce CO2 consumption, which is of great practical significance for achieving carbon peak and carbon neutrality goals in the future.

[0005] Therefore, developing a new type of gas stove that burns ammonia, or using a mixed combustion of ammonia and natural gas, can effectively reduce the consumption of natural gas, and by utilizing the fast combustion rate of natural gas, it can overcome the technical difficulty of poor combustion characteristics of ammonia. Because ammonia is toxic, during the mixed combustion process, it is necessary to control the necessary ignition sequence and the mixing ratio, and reasonably control the gas stove to ensure that the ammonia and gas are completely burned with the air.

[0006] At present, the existing technology directly uses natural gas as the gas source of the gas stove. Under the action of the Venturi tube, pressurized gas is used as the induced driving force to suck air and mix it with the air. Then, the gas-air mixed gas formed after pressure expansion enters the gas stove burner for combustion, forming a premixed flame, which further contacts the surrounding air at the burner to form diffusion combustion.

[0007] There are currently no public reports or relevant literature on the method of directly burning ammonia using a gas stove; there are currently no relevant literature on mixing ammonia with gas and then burning it. Summary of the Invention

[0008] To address the above issues, the present invention proposes a gas stove gas supply system and operating method for mixed ammonia combustion. By introducing ammonia and natural gas into the gas stove for combustion, and taking into account ammonia's slow combustion rate, difficulty in igniting, and toxicity, the system controls the mixing ratio and order of ammonia and natural gas during the mixed combustion process, thereby achieving ignition and stable combustion of the ammonia using the flame of the natural gas. By modifying the fuel gas supply pipeline and mixing device in an existing gas stove, the system effectively mixes the ammonia and natural gas, thereby achieving mixed combustion within the gas stove.

[0009] This invention establishes an ammonia and air injection system. Through a Venturi injector, air is introduced and mixed with ammonia before being fed into the gas stove, achieving ammonia combustion alone. Alternatively, the ammonia-air mixture is mixed with gas before being fed into the gas stove, achieving ammonia-gas mixed combustion.

[0010] The present invention provides a gas supply system for a gas stove for combustion of mixed ammonia, the system comprising an air injection system, an ammonia injection system, a gas injection system and a gas mixing and pressurizing system; wherein the air injection system is composed of an air inlet and an air chamber; the ammonia injection system and the gas injection system are both composed of a pipeline, a nozzle and a mixed gas contraction section; the gas mixing and pressurizing system is composed of a mixed gas straight section and a mixed gas expansion section; the ammonia injection system and the gas injection system are both connected to the gas mixing and pressurizing system.

[0011] Furthermore, the ammonia injection system includes an ammonia injection pipe; the gas injection system includes a gas injection pipe; the ammonia injection pipe and the gas injection pipe form an annular sleeve structure in the air chamber; the annular sleeve structure has an ammonia pipeline inside and a gas pipeline outside.

[0012] Furthermore, the ammonia pipeline and the fuel gas pipeline converge at the nozzle to form a tapered structure.

[0013] Furthermore, the ammonia injection system, the fuel gas injection system and the air injection system are all located on the upstream side of the gas mixing and supercharging system.

[0014] Furthermore, the air ejection system includes an ammonia ejection air system and a gas ejection air system; the ammonia ejection air system includes an ammonia ejection air inlet and an ammonia ejection air chamber, and the gas ejection air system includes a gas ejection air inlet and a gas ejection air chamber.

[0015] Furthermore, the gas mixture boosting system consists of a straight section of a gas mixture, a straight section of an ammonia mixture and a gas mixture expansion section, wherein the straight section of the gas mixture and the straight section of the ammonia mixture intersect with each other, and the intersection angle is less than or equal to 90°; the straight section of the gas mixture is connected to the gas injection system, and the straight section of the ammonia mixture is connected to the ammonia injection system.

[0016] Furthermore, the gas mixing and pressurizing system is composed of an ammonia mixture straight section, an ammonia mixture expansion section, a fuel gas mixture straight section and a fuel gas mixture expansion section.

[0017] Furthermore, the ammonia injection system is connected to the gas-injected air inlet in sequence through the ammonia mixture straight section and the ammonia mixture expansion section; the gas injection system is connected to the gas mixture straight section and the gas mixture expansion section in sequence.

[0018] Furthermore, the gas injection system is sequentially connected to the gas mixture straight section and the gas mixture expansion section; the ammonia injection system is sequentially connected to the ammonia mixture straight section and the ammonia mixture expansion section; the ammonia injection system is arranged in parallel with the gas injection system.

[0019] Furthermore, the fuel gas mixture expansion section and the ammonia mixture expansion section are both connected to a mixing tee.

[0020] The present invention also provides an operating method of the gas supply system of the gas stove for combustion with mixed ammonia. When the gas stove is ignited and started, gas is first added, and premixed gas is formed by induced air, and then sent to the burner of the gas stove for ignition and combustion. After a certain delay t1, ammonia is added, and the ammonia is premixed with air, and then mixed with the premixed gas of the gas and sent to the gas stove for combustion. When the gas stove is ready to be shut down, the ammonia is first shut off, and after a certain delay t2, the gas is shut off.

[0021] The present invention also provides an operating method for the above-mentioned gas supply system for ammonia-mixed combustion. When the gas stove is ignited and started, gas is first added, and premixed gas is formed by induced air, and then sent to the gas stove burner for ignition and combustion. After a certain delay t1, ammonia is added. When the premixed gas of ammonia and air is mixed with the premixed gas of gas again, it is sent to the gas stove to realize mixed combustion of gas and ammonia; after confirming that the ammonia is successfully ignited and forms a stable flame, the gas is cut off; when preparing to shut down the gas stove, gas is first added, and then the ammonia is turned off. After a certain delay t2, the gas combustion is shut off.

[0022] Furthermore, t1 and t2 are determined during combustion according to the mixing ratio of the fuel gas and the ammonia gas, wherein t1 is greater than t2.

[0023] This invention provides a gas stove supply system and its operating method for ammonia-blended combustion. This system allows for the separate or mixed combustion of ammonia within the gas stove, reducing gas consumption and consequently lowering fossil fuel consumption and CO2 emissions. Furthermore, through optimization of the gas supply system, the gas stove can burn either natural gas, ammonia, or a mixture of both. Four different injection methods allow for flexible configuration of the gas supply system, achieving uniform mixing of ammonia, air, and natural gas.

[0024] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A diagram showing an apparatus for a common ammonia and fuel gas injection system according to a first embodiment of the present invention;

[0027] Figure 2 A diagram showing an apparatus of an independent ammonia and fuel gas injection system according to a second embodiment of the present invention;

[0028] Figure 3 A device diagram showing an ammonia injection system according to a third embodiment of the present invention arranged in an inlet passage of gas-injected air;

[0029] Figure 4 A diagram showing an apparatus for independently injecting, mixing, and expanding ammonia and fuel gas and then mixing them according to a fourth embodiment of the present invention;

[0030] Reference numerals: 1. air chamber; 2. gas mixture contraction section; 3. gas mixture straight section; 4. gas mixture expansion section; 5. gas inlet; 6. ammonia inlet; 7. annular sleeve; 8. air inlet; 9. gas-ammonia nozzle; 10. mixing tee;

[0031] 1a. Gas injection air chamber; 1b. Ammonia injection air chamber; 2a. Gas mixture contraction section; 2b. Ammonia mixture contraction section; 3a. Gas mixture straight section; 3b. Ammonia mixture straight section; 4a. Gas mixture expansion section; 4b. Ammonia mixture expansion section; 8a. Gas injection air inlet; 8b. Ammonia injection air inlet; 9a. Gas nozzle; 9b. Ammonia nozzle. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0033] The present invention provides a gas supply system for a gas stove for combustion of mixed ammonia, which includes an air injection system, an ammonia injection system, a gas injection system and a gas mixing and pressurizing system; the air injection system is composed of an air inlet and an air chamber; the ammonia injection system and the gas injection system are both composed of a pipeline, a nozzle and a mixed gas contraction section; the gas mixing and pressurizing system is composed of a mixed gas straight section and a mixed gas expansion section; the ammonia injection system and the gas injection system are both connected to the gas mixing and pressurizing system.

[0034] Depending on the different ways ammonia and fuel gas are mixed, this invention is divided into four different mixing methods.

[0035] The first embodiment of the present invention is Figure 1 The figure shows the installation diagram of the air injection system shared by ammonia and fuel gas. Figure 1 In the process, natural gas enters the gas pipeline through gas inlet 5, and ammonia enters the ammonia pipeline through ammonia inlet 6. The gas pipeline and the ammonia pipeline form a ring-shaped sleeve 7 in the air chamber 1. The inside of the ring-shaped sleeve 7 is the gas pipeline, and the outside is the ammonia pipeline. The two converge at the ammonia-gas nozzle 9 to form a cone shape. Figure 1 In the diagram shown, the fuel gas and ammonia gas share a common air ejection system, which consists of an air inlet 8 and an air chamber 1. The ammonia injection system, fuel gas injection system, and air ejection system are all located upstream of the gas mixing and pressurization system. The ammonia injection system and fuel gas injection system are connected sequentially to the straight section 3 and the expansion section 4 of the mixed gas.

[0036] The ammonia-gas mixture is ejected into the air chamber 1 through the ammonia-gas nozzle 9 to form a high-speed jet and a negative pressure, thereby drawing air from the air inlet 8 into the air chamber 1, forming a gas-ammonia-air premixed gas in the gas mixture contraction section 2, and then sequentially passing through the gas mixture straight section 3 and the gas mixture expansion section 4, thereby achieving full mixing of the gas-ammonia-air, pressure and velocity changes, and forming a premixed gas with uniform composition, which is then fed into the subsequent gas stove burner for combustion.

[0037] The second embodiment of the present invention is Figure 2 The figure shows the installation diagram of the independent ammonia and fuel gas injection system. Figure 2 The air injection system includes an ammonia-injected air system and a gas-injected air system. The ammonia-injected air system includes an ammonia-injected air inlet 8b and an ammonia-injected air chamber 1b, while the gas-injected air system includes a gas-injected air inlet 8a and a gas-injected air chamber 1a. The gas mixing and pressurizing system consists of a gas mixture straight section 3a, an ammonia mixture straight section 3b, and a gas mixture expansion section 4a. The gas mixture straight section 3a and the ammonia mixture straight section 3b intersect at an angle of less than or equal to 90°. The gas mixture straight section 3a is connected to the gas injection system, while the ammonia mixture straight section 3b is connected to the ammonia injection system.

[0038] Figure 2 In the embodiment, the ammonia inlet 6 and the fuel gas inlet 5 are respectively provided with air injection systems, and external air is injected through independent devices to form premixed gas, wherein ammonia is ejected from the ammonia inlet 6 through the ammonia nozzle 9b and forms a high-speed airflow, and air is introduced from the ammonia injection air inlet 8b and enters the ammonia injection air chamber 1b, and enters the ammonia mixed gas contraction section 2b together with the high-speed ammonia to further accelerate and mix, forming an ammonia-air mixed gas. Gas is ejected from the gas inlet 5 through the gas nozzle 9a to form a high-speed airflow, which introduces air from the gas induced air inlet 8a into the gas induced air chamber 1a, and enters the gas mixture contraction section 2a together with the high-speed gas to be mixed, and a gas-air mixture is formed in the gas mixture contraction section 2a; the ammonia-air mixed in the ammonia mixture contraction section 2b and the gas-air mixed in the gas mixture contraction section 2a intersect in the gas mixture straight section 3a, achieving full mixing of the ammonia-air mixture and the gas-air mixture in the gas mixture straight section 3a, and then decelerating and pressurizing in the gas mixture expansion section 4a to form a premixed mixed gas that meets the combustion requirements of the gas stove burner.

[0039] The third embodiment of the present invention is Figure 3 The figure shows an apparatus diagram in which the ammonia injection system is arranged in the inlet channel of the gas injection air. Figure 3The air-injection system includes an ammonia-injection air system and a gas-injection air system. The ammonia-injection air system includes an ammonia-injection air inlet 8b and an ammonia-injection air chamber 1b, while the gas-injection air system includes a gas-injection air inlet 8a and a gas-injection air chamber 1a. The gas mixing and pressurizing system consists of an ammonia mixture straight section 3b, an ammonia mixture expansion section 4b, a gas mixture straight section 3a, and a gas mixture expansion section 4a. The ammonia injection system is connected to the gas-injection air inlet 8a via the ammonia mixture straight section 3b and the ammonia mixture expansion section 4b, respectively. The gas injection system is connected to the gas mixture straight section 3a and the gas mixture expansion section 4a, respectively.

[0040] Figure 3 In the process, high-pressure ammonia is ejected at high speed from the ammonia inlet 6 through the ammonia nozzle 9b, drawing in external air, and passing through the ammonia induced air inlet 8b, drawing the external air into the ammonia induced chamber 1b, where it is mixed with the high-speed ammonia at the outlet of the ammonia nozzle 9b in the ammonia mixture contraction section 2b, and then enters the ammonia mixture straight section 3b and the ammonia mixture expansion section 4b in sequence. The ammonia-air mixture enters the gas induced air inlet 8a, and after being fully mixed, is injected into the gas induced chamber 1a.

[0041] After being ejected at high speed from gas inlet 5 through gas nozzle 9a, the gas passes through gas mixture contraction section 2a, drawing the ammonia-air mixture from gas injection air chamber 1a. This gas is introduced through gas injection air inlet 8a. The ammonia-air mixture, drawn into gas mixture contraction section 2a by high-pressure gas, is accelerated and mixed there to form gas-ammonia-air. The mixture then enters gas mixture straight section 3a and gas mixture expansion section 4a, where it is further mixed and pressurized before being delivered to the gas stove burner.

[0042] Fourth embodiment of the present invention, for example Figure 4 As shown, this is a diagram of a device in which ammonia and fuel gas are independently injected, mixed, and diffused before being mixed. Figure 4The air ejection system includes an ammonia ejection air system and a gas ejection air system. The ammonia ejection air system includes an ammonia ejection air inlet 8b and an ammonia ejection air chamber 1b, while the gas ejection air system includes a gas ejection air inlet 8a and a gas ejection air chamber 1a. The gas mixing and pressurization system consists of an ammonia mixture straight section 3b, an ammonia mixture expansion section 4b, a gas mixture straight section 3a, and a gas mixture expansion section 4a. The gas injection system is connected sequentially to the gas mixture straight section 3a and the gas mixture expansion section 4a; the ammonia injection system is connected sequentially to the ammonia mixture straight section 3b and the ammonia mixture expansion section 4b; the ammonia injection system is arranged parallel to the gas injection system. Both the gas mixture expansion section 4a and the ammonia mixture expansion section 4b are connected to the mixing tee 10.

[0043] Figure 4 In the process, high-pressure gas is ejected at high speed from the gas inlet 5 through the gas nozzle 9a, and then the external air is drawn in from the gas induced air inlet 8a, and enters the gas induced air chamber 1a, where the air is mixed with the gas in the gas mixture contraction section 2a, and then enters the gas mixture straight section 3a and the gas mixture expansion section 4a in sequence, forming a premixed gas (gas-air) suitable for combustion in the gas stove burner.

[0044] High-pressure ammonia gas is injected at high speed from ammonia inlet 6 through ammonia nozzle 9b, drawing in external air through ammonia air inlet 8b. This air enters ammonia air chamber 1b and mixes with ammonia in ammonia gas contraction section 2b. The mixture then sequentially enters ammonia gas straight section 3b and ammonia gas expansion section 4b, forming a premixed gas (ammonia-air) suitable for combustion in the gas stove burner. The two premixed gases pass through mixing tee 10, where gas-air and ammonia-air are combined and mixed to form a gas-ammonia-air premixed gas, which is then fed into the gas stove burner for combustion.

[0045] The aforementioned gas stove gas supply system for combustion mixed with ammonia takes into account the toxicity and odor of ammonia and the differences in the combustion characteristics of gas and ammonia, fully considering the mixing ratio and order of addition. The present invention takes special considerations when supplying a mixed gas of ammonia and gas, and mainly has two operating methods: the first method is the mixed combustion of gas and ammonia. When the gas stove is ignited and started, gas is first added, and premixed gas is formed by induced air. This is then fed into the gas stove burner for ignition and ignition. After a delay of a certain time t1, ammonia is added, and the ammonia is premixed with air, and then mixed with the premixed gas of gas and fed into the gas stove for combustion. When the gas stove is ready to be shut down, the ammonia is first shut off, and after a delay of a certain time t2, the gas is shut off to ensure that there is no odor caused by incomplete combustion of ammonia. The second method is to use gas as the combustion-supporting gas, and the gas stove mainly burns ammonia. When the gas stove is ignited and started, gas is first added, and premixed gas is formed by injecting air, and then sent to the gas stove burner for ignition and ignition. After a delay of a certain time t1, ammonia is added. When the premixed gas of ammonia and air is mixed with the premixed gas of gas again, it is sent to the gas stove to realize the mixed combustion of gas and ammonia. After confirming that the ammonia is successfully ignited and forms a stable flame, the gas is cut off, so that the gas stove can burn ammonia alone; when preparing to shut down the gas stove, gas is first added to realize the mixed combustion of gas and ammonia, and then the ammonia is turned off. After a delay of a certain time t2, the gas combustion is turned off to ensure that there is no odor caused by incomplete combustion of ammonia.

[0046] The above t1 and t2 are actually determined during combustion according to the mixing ratio of the fuel gas and ammonia, wherein t1 is greater than t2.

[0047] The present invention can utilize a gas stove to burn a mixture of ammonia and gas, thereby reducing gas consumption and lowering CO2 emissions; by controlling the mixing ratio of ammonia to gas, the probability of flashback of the gas stove burner and pipeline can be increased; by controlling the injection sequence of ammonia and gas, gas can be used as a combustion-supporting energy source for ammonia combustion, thereby preventing the problem of incomplete combustion and escape of ammonia; without changing the structure of the gas burner, the device can burn both gas and a mixture of ammonia and gas, thereby reducing the complexity of the system.

[0048] The application field of the present invention is civilian use. It can partially replace natural gas as the input gas source of gas stoves, increasing the diversity of gas stove fuel supply. It can be applied not only to fixed gas stoves, but also to mobile gas stoves, such as for outdoor cooking or portable gas stoves.

[0049] The main application prospect of the present invention lies in that with the increasingly stringent control of CO2 emissions in the future, the requirement for CO2 emission reduction in the civilian cooking gas stove industry will require the development of alternative fuels, or the blending of low-carbon and zero-carbon fuels to reduce the consumption of conventional energy such as natural gas, coal gas, liquefied petroleum gas, etc. The clean gas products produced by the combustion of ammonia have no CO2 emissions. Blending ammonia to replace part of the natural gas will have significant application prospects. In particular, with the large-scale development of renewable energy, the use of wind power and photovoltaic power generation to produce green ammonia can not only reduce the requirements for the distribution network, but also serve as an efficient and low-cost energy conversion and storage medium, which is convenient for large-scale manufacturing, transportation, storage and use, providing the basic conditions for the efficient and clean utilization of green ammonia, and also creating the possibility of blending ammonia into civilian cooking gas devices.

[0050] With the maturity of green ammonia production technology, in the near future, the use of ammonia in gas stoves to reduce CO2 emissions will become a trend, and the development and promotion of green gas stoves will reach thousands of households.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas supply system for a gas stove mixed with ammonia for combustion, characterized in that: The system includes an air injection system, an ammonia injection system, a fuel gas injection system and a gas mixing and pressurizing system; wherein, The air injection system is composed of an air inlet and an air chamber; The ammonia injection system and the fuel gas injection system are both composed of a pipeline, a nozzle and a mixed gas contraction section; The gas mixing and supercharging system is composed of a mixed gas straight section and a mixed gas expansion section; The ammonia injection system and the fuel gas injection system are both connected to the gas mixing and pressurizing system; The air injection system includes an ammonia injection air system and a gas injection air system; the ammonia injection air system includes an ammonia injection air inlet and an ammonia injection air chamber, and the gas injection air system includes a gas injection air inlet and a gas injection air chamber.

2. The system according to claim 1, characterized in that The gas mixing and pressurizing system is composed of a gas mixture straight section, an ammonia mixture straight section and a gas mixture expansion section, wherein: The straight section of the fuel gas mixture intersects with the straight section of the ammonia mixture, and the intersection angle is less than or equal to 90°; The straight section of the fuel gas mixture is connected to the fuel gas injection system, and the straight section of the ammonia mixture is connected to the ammonia injection system.

3. The system according to claim 1, characterized in that The gas mixing and pressurizing system consists of an ammonia mixed gas straight section, an ammonia mixed gas expansion section, a fuel gas mixed gas straight section and a fuel gas mixed gas expansion section.

4. The system according to claim 3, characterized in that The ammonia injection system is connected to the gas injection air inlet in sequence through the ammonia mixture straight section and the ammonia mixture expansion section; The gas injection system is connected to the gas mixture straight section and the gas mixture expansion section in sequence.

5. The system according to claim 3, characterized in that The gas injection system is connected to the gas mixture straight section and the gas mixture expansion section in sequence; The ammonia injection system is connected to the ammonia mixture straight section and the ammonia mixture expansion section in sequence; The ammonia injection system is arranged in parallel with the fuel gas injection system.

6. The system according to claim 5, characterized in that The fuel gas mixture expansion section and the ammonia mixture expansion section are both connected to the mixing tee.

7. An operating method of a gas stove gas supply system for combustion of mixed ammonia as claimed in any one of claims 1 to 6, characterized in that: When the gas stove is ignited, the gas is first fed in, and the premixed gas is formed by the induced air, and then sent to the burner of the gas stove for ignition and ignition. After a certain delay t1, ammonia is fed in, and the ammonia is premixed with the air, and then mixed with the premixed gas of the gas, and then sent to the gas stove for combustion; When preparing to shut down the gas stove, first turn off the ammonia, and then turn off the gas after a certain delay of t2.

8. An operating method of a gas stove gas supply system for combustion of mixed ammonia as claimed in any one of claims 1 to 6, characterized in that: When the gas stove is ignited, gas is first added, and premixed gas is formed by induced air, and then sent to the gas stove burner for ignition and ignition. After a certain delay t1, ammonia is added. When the premixed gas of ammonia and air is mixed with the premixed gas of gas again, it is sent to the gas stove to realize the mixed combustion of gas and ammonia; When it is confirmed that the ammonia is ignited successfully and forms a stable flame, cut off the gas; When you are ready to shut down the gas stove, first put in the gas, then turn off the ammonia, and after a certain delay t2, shut off the gas combustion.

9. The method according to claim 7 or 8, characterized in that: t1 and t2 are determined during combustion according to the mixing ratio of the fuel gas and the ammonia gas, wherein t1 is greater than t2.

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