Combustion furnace system

Abstract

The utility model discloses a combustion furnace system, which belongs to the technical field of combustion furnaces and is characterized in that an inlet end of a combustion furnace is connected with a fuel gas tank and a fan, a spark plug is arranged in the inlet end of the combustion furnace, and the spark plug is electrically connected with a controller; an SOEC system is arranged in the outlet end of the combustion furnace, a condensation separator is arranged at the upper end of the combustion furnace, and the inlet end of the condensation separator is connected with the SOEC system; the outlet end of the condensation separator is connected with the inlet end of the solution tank, and the outlet end of the solution tank is connected with the gas separator; the gas separator is connected with the hydrogen cylinder and the gas cylinder, and the hydrogen cylinder and the gas cylinder are connected with the inlet end of the combustion furnace. Heat of the hearth in the combustion furnace can be fully utilized as a temperature environment for working of the SOEC, external extra energy loss is avoided, gas generated by working of the SOEC can continue to serve as supplementary gas to be thrown into the combustion furnace, a complementary cycle is formed by the gas and the supplementary gas, and the energy utilization rate is overall improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of combustion furnaces, and particularly relates to a combustion furnace system. Background Technique

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] Generally, the combustion furnace system used in industry mainly includes a combustion furnace body, a controller, a fuel gas tank, an air inlet device, etc. According to the actual heat demand, the temperature is adjusted. When in use, the temperature control equipment mainly controls the fuel inlet flow through the temperature sensing signal to adjust the temperature of the combustion chamber, and the formed hot air flows out through the outlet of the combustion furnace to meet the use under different temperature requirements.

[0004] Since the furnace chamber is in a high-temperature environment, on the one hand, it can provide sufficient heat supply for the subsequent processes, and on the other hand, it can serve as a good environment for high-temperature operation equipment. Solid oxide electrolyzer (SOEC) as a new generation of hydrogen production technology can efficiently and cleanly couple with renewable energy and convert it into chemical energy, and it is an efficient and environmentally friendly energy conversion device. SOEC has the advantages of high energy conversion efficiency, large current density, strong stability, and no need to use precious metal catalysts, and it is a promising hydrogen production method, but its operating temperature range needs to be higher than 650 °C, which is also one of the main reasons hindering its large-scale development.

[0005] At present, in order to further improve the power generation efficiency, gas power plants generally adopt gas-steam combined cycle power generation. During the power generation process, by-product high-temperature water vapor is used for steam cycle power generation. However, the carbon dioxide generated by gas combustion urgently needs to be treated and utilized. In the application scenarios of rich renewable energy resources or cheap valley electricity prices of the power grid, how to make full use of the tail gas generated by the combustion furnace is an urgent problem to be solved in this field. Content of the Utility Model

[0006] Aiming at the above problems, the utility model provides a combustion furnace system, which can make full use of the heat in the furnace chamber of the combustion furnace as the temperature environment for the operation of SOEC, avoiding additional external energy loss. The gas generated during the operation of SOEC can continue to be input into the combustion furnace as a supplementary gas, and the two form a complementary cycle, overall improving the energy utilization rate.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A combustion furnace system includes a combustion furnace. The inlet end of the combustion furnace is connected to a fuel gas tank and a blower. A spark plug is disposed inside the inlet end of the combustion furnace, and the spark plug is electrically connected to a controller. An SOEC system is disposed inside the outlet end of the combustion furnace. A condensation separator is disposed at the upper end of the combustion furnace, and the inlet end of the condensation separator is connected to the SOEC system. The outlet end of the condensation separator is connected to the inlet end of a solution tank, and the outlet end of the solution tank is connected to a gas separator. The gas separator is connected to a hydrogen cylinder and a gas cylinder, and the hydrogen cylinder and the gas cylinder are connected to the inlet end of the combustion furnace.

[0009] Further, the outlet end of the combustion furnace is connected to the inlet end of a heat exchanger.

[0010] Further, a first control valve is disposed on the pipeline connecting the hydrogen cylinder and the inlet end of the combustion furnace. One end of the first control valve is connected to the hydrogen cylinder, and the other end is connected to the combustion furnace.

[0011] Further, a second control valve is disposed on the pipeline connecting the gas cylinder and the inlet end of the combustion furnace. One end of the second control valve is connected to the gas cylinder, and the other end is connected to the combustion furnace.

[0012] Further, the upper end of the gas separator is connected to the hydrogen cylinder through a pipeline.

[0013] Further, the side of the gas separator is connected to the gas cylinder through a pipeline.

[0014] Further, the SOEC system includes an SOEC anode, an SOEC electrolyte, an SOEC cathode, and a power source.

[0015] Further, one end of the SOEC anode is provided with the SOEC electrolyte, and one end of the SOEC electrolyte is provided with the SOEC cathode.

[0016] Further, the SOEC anode is connected to the positive electrode of the power source through a wire, and the SOEC cathode is connected to the SOEC cathode through a wire.

[0017] Further, lime water is contained in the solution tank.

[0018] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0019] (1) The present utility model makes full use of the heat inside the furnace of the combustion furnace as the temperature environment for the SOEC to work, avoiding additional external energy loss. The gases (hydrogen and carbon monoxide) generated by the SOEC during operation can be continuously input into the combustion furnace as supplementary gases, forming a complementary cycle between the two, and overall improving the energy utilization rate.

[0020] (2) In the present utility model, hydrogen and carbon monoxide are input into the combustion furnace as supplementary combustion gases. When the intake air volume is changed and the combustion furnace is restarted, the stability of the flame can be improved, making it not easy to go out. When hydrogen is present during the combustion of hydrocarbon fuels, it can effectively promote their full combustion. When temperature increase is required, the intake air volume of hydrogen can be controlled by the controller to achieve the purpose of rapid temperature increase.

[0021] (3) In the present utility model, the combustion products (water and carbon dioxide) in the furnace are recycled as part of the tail gas, and the generated carbon monoxide and hydrogen are recovered and utilized, reducing the cost of hydrogen production and carbon emissions at the same time, which is beneficial to energy conservation and emission reduction.

[0022] (4) In the present utility model, the proportion of water in the hot air of the combustion furnace is reduced. If the hot air is used in the drying field, the error of the drying process can be effectively reduced; carbon dioxide in the tail gas discharged from the SOEC is recovered, further reducing carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The schematic drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model.

[0024] Figure 1 is a structural diagram of the combustion furnace system of the present utility model;

[0025] Figure 2 is a structural diagram of the SOEC system of the present utility model;

[0026] In the figure: 1. Combustion furnace; 2. Controller; 3. Fuel gas tank; 4. Fan; 5. Spark plug; 6. SOEC system; 7. Condensation separator; 8. Solution tank; 9. Gas separator; 10. Hydrogen cylinder; 11. Gas cylinder; 12. First control valve; 13. Heat exchanger; 14. SOEC anode; 15. SOEC electrolyte; 16. SOEC cathode; 17. Power supply; 18. Second control valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations of the present utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0028] The following combines the drawings to describe the present utility model in detail. An embodiment of the present utility model discloses a combustion furnace system, as Figure 1As shown in the figure, it includes a combustion furnace 1. The inlet end of the combustion furnace 1 is connected to a fuel gas tank 3 and a blower 4. A spark plug 5 is arranged inside the inlet end of the combustion furnace 1, and the spark plug 5 is electrically connected to a controller 2. An SOEC system 6 is arranged inside the outlet end of the combustion furnace 1. A condensation separator 7 is arranged at the upper end of the combustion furnace 1, and the inlet end of the condensation separator 7 is connected to the SOEC system 6. The outlet end of the condensation separator 7 is connected to the inlet end of a solution tank 8, and the outlet end of the solution tank 8 is connected to a gas separator 9. The gas separator 9 is connected to a hydrogen cylinder 10 and a gas cylinder 11, and the hydrogen cylinder 10 and the gas cylinder 11 are connected to the inlet end of the combustion furnace 1.

[0029] The outlet end of the combustion furnace 1 is connected to the inlet end of a heat exchanger 13. The heat exchanger 13 is an energy-saving device that realizes heat transfer between materials among two or more fluids at different temperatures. It enables heat to be transferred from a fluid with a higher temperature to a fluid with a lower temperature, so that the fluid temperature reaches the specified index of the process, to meet the needs of the process conditions. At the same time, it is also one of the main devices to improve the energy utilization rate.

[0030] A first control valve 12 is arranged on the pipeline connecting the hydrogen cylinder 10 and the inlet end of the combustion furnace 1. One end of the first control valve 12 is connected to the hydrogen cylinder 10, and the other end is connected to the combustion furnace 1. A second control valve 18 is arranged on the pipeline connecting the gas cylinder 11 and the inlet end of the combustion furnace 1. One end of the second control valve 18 is connected to the gas cylinder 11, and the other end is connected to the combustion furnace 1. The upper end of the gas separator 9 is connected to the hydrogen cylinder 10 through a pipeline. The side part of the gas separator 9 is connected to the gas cylinder 11 through a pipeline. Lime water is contained in the solution tank 8. The hydrogen, carbon monoxide and oxygen generated after treating the waste gas are respectively transported to the hydrogen cylinder 10 and the gas cylinder 11 through the first control valve 12 and the second control valve 18.

[0031] As Figure 2 As shown in the figure, the SOEC system 6 includes an SOEC anode 14, an SOEC electrolyte 15, an SOEC cathode 17 and a power supply 17. One end of the SOEC anode 14 is provided with the SOEC electrolyte 15, one end of the SOEC electrolyte 15 is provided with the SOEC cathode 17, the SOEC anode 14 is connected to the positive pole of the power supply 17 through a wire, and the SOEC cathode 17 is connected to the SOEC cathode 17 through a wire.

[0032] The fuel gas tank 3 is connected to the combustion furnace 1. The intake system adjusts the intake air volume by controlling the blower 4. After the fuel and air are fully mixed in the combustion chamber, the switch of the combustion furnace 1 is turned on. After being detected by the controller 2, a high voltage is released and the fuel is ignited under the action of the spark plug 5. According to the set temperature, the controller 2 automatically adjusts the intake fuel volume. The heat accumulates and is output in the furnace until it reaches about 700 °C. The carbon dioxide and water vapor generated by combustion are transmitted towards the end of the furnace along with the wind speed, and part of them enters the SOEC cathode 17; the SOEC system 6 starts co-electrolysis under its temperature environment, and its electrochemical reaction is as follows:

[0033] The reaction occurring at the cathode is: H2O + 2e - → O 2- + H2 CO2 + 2e - → O 2- + CO

[0034] The reaction occurring at the anode is: O 2- - 2e - → O2

[0035] Total reaction: H2O → 1 / 2O2 + H2 CO2 → CO + 1 / 2O2

[0036] The SOEC system 6 is a solid oxide electrolytic cell, which has internal flow channels itself. Carbon dioxide and water vapor enter the cathode flow channel driven by hot air. The reaction gas in the cathode flow channel enters the porous electrode reaction layer through spontaneous diffusion. Water vapor and carbon dioxide simultaneously undergo electrochemical reactions here and participate in electrolysis. The generated oxygen ions reach the anode through the oxygen ion vacancies of the electrolyte and undergo electrochemical reactions under the action of the electrode catalyst to generate oxygen. Thus, in the SOEC system 6, the gas is divided into two streams (cathode flow channel, anode flow channel), and the pipelines tightly connected to its outlet carry it out to the condensation separators 77 of each part. The gas discharged from the cathode flow channel mainly includes carbon monoxide, hydrogen, and part of the excess water vapor and carbon dioxide in the reaction. It is cooled and condensed in the condenser to remove the water vapor in the mixed gas. Connected to the outlet of the condensation separator 7 is a solution tank 8 filled with clear lime water. The mixed gas is introduced from the bottom of the tank, and the upper end serves as the outlet of the solution tank 8, aiming to recover the carbon dioxide in the mixed gas, which can reduce carbon emissions to a certain extent; the mixed gas coming out of the solution tank 8 is separated in the gas separator 9 and separated into the corresponding recovery gas cylinders 11, and the obtained hydrogen and carbon monoxide fuels are returned to the combustion furnace 1 again to participate in combustion support. The controller 2 automatically controls the intake air volume of hydrogen and carbon monoxide through the flame induction signal.

[0037] The mixed gas discharged from the SOEC anode 14 includes oxygen, partially reacted excess carbon dioxide and water vapor. The mixed gas also enters the condensation separator 7 to condense and discharge the contained water vapor. The mixed gas is simultaneously introduced into the solution tank 8 filled with clarified lime water together with the mixed gas discharged from the cathode to remove carbon dioxide. Immediately afterwards, the remaining gas is separated into hydrogen, carbon monoxide and oxygen in the gas separator 9, thereby forming a fuel recycling system.

[0038] When the temperature required in industry is relatively high, the temperature environment created by the combustion chamber exactly meets the operating temperature of the SOEC. Considering the high compatibility between the two, the combustion furnace 1 operating at high temperature can be coupled with the SOEC to form a combined system. Generally, the fuel passed through the combustion furnace 1 is mainly hydrocarbon fuel, and the combustion products are mainly carbon dioxide and water (in the form of water vapor at high temperature), which can just be used as the reaction products of the SOEC to produce hydrogen and carbon monoxide to supply the combustion furnace 1 to promote combustion.

[0039] The combined system integrates the combustion furnace 1 and the SOEC system 6, enabling the two to complement each other's advantages. The combustion furnace 1 generates thermal energy, and the SOEC system 6 generates chemical energy. The hydrogen production device makes full use of the high-temperature environment of the combustion furnace 1, and the combustion furnace 1 obtains a certain amount of supplementary gas. From the perspective of hydrogen production, the additional energy consumption for starting the SOEC system 6 is avoided, and a certain amount of hydrogen and carbon monoxide fuels are produced while outputting thermal energy, converting from large-molecule hydrocarbon fuels to small-molecule low-carbon fuels, thus realizing carbon recycling. The water vapor content in the output hot gas is reduced, simplifying the difficulty of subsequent processes. Similarly, the carbon dioxide in the tail gas output by the SOEC system 6 is recycled, reducing carbon emissions. The heating rate and flame stability of the combustion furnace 1 are improved, promoting the complete combustion of hydrocarbon fuels in the furnace.

[0040] When the air intake is changed, the flame in the furnace fluctuates significantly, making the combustion phenomenon unstable, and even flameout may occur. The hydrogen and carbon monoxide co-electrolyzed and produced by the SOEC system 6 can be separated and collected, and can be controlled to enter the combustion chamber as supplementary gas for supplementary combustion through control. Some studies have shown that hydrogen can promote combustion to a certain extent during the combustion of hydrocarbon fuels, increasing the flame propagation distance to achieve the purpose of ignition, thereby improving combustion stability. The SOEC system 6 converts part of the combustion products, water vapor and carbon dioxide, into hydrogen and carbon monoxide for recycling, which can reduce the moisture content ratio at the outlet of the combustion furnace to a certain extent. If the output hot air is used in technical fields such as drying, it can indirectly reduce the error of dried products. At the same time, it also reduces carbon dioxide emissions to a certain extent, which is beneficial to energy conservation and emission reduction.

[0041] Although the specific implementation manners of the present utility model have been described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present utility model. Those skilled in the art should understand that various modifications or deformations that can be made without creative efforts on the basis of the technical solution of the present utility model are still within the protection scope of the present utility model.

Claims

1. A combustion furnace system, characterized in that: It comprises a combustion furnace, wherein the inlet end of the combustion furnace is connected to a fuel gas tank and a blower, a spark plug is arranged inside the inlet end of the combustion furnace, and the spark plug is electrically connected to a controller; a SOEC system is arranged inside the outlet end of the combustion furnace, a condensation separator is arranged at the upper end of the combustion furnace, and the inlet end of the condensation separator is connected to the SOEC system; the outlet end of the condensation separator is connected to the inlet end of a solution tank, and the outlet end of the solution tank is connected to a gas separator; the gas separator is connected to a hydrogen cylinder and a gas cylinder, and the hydrogen cylinder and the gas cylinder are connected to the inlet end of the combustion furnace.

2. A combustion furnace system according to claim 1, characterized in that: The outlet end of the combustion furnace is connected to the inlet end of the heat exchanger.

3. A combustion furnace system according to claim 1, characterized in that: A first control valve is arranged on the pipeline connecting the hydrogen cylinder and the inlet end of the combustion furnace. One end of the first control valve is connected to the hydrogen cylinder, and the other end is connected to the combustion furnace.

4. A combustion furnace system according to claim 1, characterized in that: A second control valve is arranged on the pipeline connecting the gas cylinder and the inlet end of the combustion furnace, one end of the second control valve is connected to the gas cylinder, and the other end is connected to the combustion furnace.

5. A combustion furnace system according to claim 1, characterized in that: The upper end of the gas separator is connected to the hydrogen bottle through a pipeline.

6. A combustion furnace system according to claim 5, characterized in that: The side of the gas separator is connected to the gas cylinder through a pipeline.

7. A combustion furnace system according to claim 1, characterized in that: The SOEC system includes a SOEC anode, a SOEC electrolyte, a SOEC cathode and a power source.

8. A combustion furnace system according to claim 7, characterized in that: A SOEC electrolyte is disposed at one end of the SOEC anode, and a SOEC cathode is disposed at one end of the SOEC electrolyte.

9. A combustion furnace system according to claim 7, characterized in that: The SOEC anode is connected to the positive electrode of the power supply through a wire, and the SOEC cathode is connected to the SOEC cathode through a wire.

10. A combustion furnace system according to claim 1, characterized in that: Lime water is contained in the solution tank.

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