Device for coupling low-carbon combustion process and adjusting method thereof

Abstract

The invention discloses a coupling low-carbon combustion process device and an adjusting method thereof, and relates to the field of coupling low-carbon combustion process devices, the coupling low-carbon combustion process device comprises a fuel supply system, an oxygen-enriched / total-oxygen supply system, an air supply system, a flue gas circulation system, a fuel combustion system and a flue gas treatment system; the fuel supply system is used for providing solid-phase fuel, liquid-phase fuel and gas-phase fuel; the oxygen-enriched / total-oxygen supply system is combined with the air supply system and used for changing the combustion atmosphere in the combustion furnace and achieving fuel oxygen-enriched / total-oxygen combustion. The flue gas treatment system comprises a two-stage heat exchanger, a cooling tower and a dust collector; the fuel combustion system is composed of a combustion furnace, an online flue gas analyzer and a temperature, pressure and flow detection device. According to the invention, the synergistic effect among different processes is realized, so that the defect of single process application of the existing platform is effectively overcome, a new solution is provided for low-carbon, high-efficiency and clean industrial combustion process, and multiple low-carbon combustion processes such as alternative fuel combustion, oxygen-enriched / oxygen-full combustion, flue gas circulation and the like are organically coupled.

Description

Technical Field

[0001] The present invention relates to the field of devices coupled with low-carbon combustion processes, and in particular to a device coupled with low-carbon combustion processes and a regulating method thereof. Background Art

[0002] As the world actively promotes the dual carbon goals, the low-carbon transformation of combustion processes in the industrial field, as an important source of carbon emissions, has become a key issue. Although traditional oxygen-enriched / full-oxygen combustion platforms can reduce carbon emissions to a certain extent, they face challenges when operating alone, such as difficulty in controlling combustion temperature and stringent requirements on equipment materials in high-temperature oxygen-rich environments. The flue gas recirculation process alone has limited effect in reducing nitrogen oxide emissions and regulating combustion temperature, and cannot interact with fuel combustion characteristics and oxygen-enriched / full-oxygen combustion, making it difficult to achieve overall optimization of the combustion process.

[0003] Existing low-carbon combustion platforms have many limitations when responding to increasingly stringent environmental protection and energy efficiency requirements. Most current combustion devices are only designed for a single low-carbon technology, and multi-process coupling technology is lacking. When alternative fuels are burned, there is a lack of coordination with other processes, making it difficult to effectively solve problems such as poor combustion stability of alternative fuels and calorific value fluctuations affecting system operating efficiency. To this end, we propose a device coupled with a low-carbon combustion process and its adjustment method. Summary of the Invention

[0004] The purpose of the present invention is to solve the defects in the prior art and to propose a device coupled with a low-carbon combustion process and a regulation method thereof.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A device coupled with a low-carbon combustion process, comprising a fuel supply system, an oxygen-enriched / full oxygen supply system, an air supply system, a flue gas circulation system, a fuel combustion system, and a flue gas treatment system;

[0007] The fuel supply system includes a gas fuel supply system, a solid fuel supply system and a liquid fuel supply system, which are used to provide solid, liquid and gas three-phase fuel;

[0008] The oxygen-enriched / full oxygen supply system is combined with the air supply system to change the combustion atmosphere in the combustion furnace;

[0009] The flue gas treatment system includes a two-stage heat exchanger, a cooling tower and a dust collector;

[0010] The fuel combustion system consists of a combustion furnace, an online flue gas analyzer, and a temperature, pressure, and flow detection device.

[0011] As a further solution of the present invention, the specific steps of providing solid, liquid and gas three-phase fuels by the gas fuel supply system, the solid fuel supply system and the liquid fuel supply system are as follows:

[0012] The gas fuel is delivered to the burner inlet through the gas regulating valve group;

[0013] Solid fuel is fed through a powder metering scale and transported by a fan.

[0014] Liquid fuel is transported by an oil pump, and a flow regulation system is set up to adjust the amount of liquid fuel.

[0015] As a further solution of the present invention, the specific steps of combining the oxygen-enriched / full oxygen supply system with the air supply system to change the combustion atmosphere in the combustion furnace are as follows:

[0016] By adjusting the gas mixer, the ratio of CO2, O2 and N2 can be infinitely adjusted. The adjustment ratio of each gas content is 5% to 99%. The mixed gas is transported in two ways:

[0017] S1, directly transported to the combustion furnace through the pipeline;

[0018] S2, after being mixed with the air from the air supply system, is transported to the combustion furnace to carry out the oxygen-enriched / full oxygen combustion experiment.

[0019] As a further solution of the present invention: the combustion furnace is provided with an observation window, and the internal insulation material of the combustion furnace is divided into two parts, the lower part of the combustion furnace is filled with mullite insulation bricks and high-temperature calcium aluminum silicate boards, and the upper part of the combustion furnace is filled with high-temperature spray coating, polycrystalline mullite blocks and zirconium-containing fiber modules.

[0020] As a further solution of the present invention: a total of 16 circulating flue gas injection ports are arranged at the front end of the combustion furnace, and the 16 circulating flue gas injection ports are respectively located in the outer circle away from the flame and the inner circle close to the flame, and each position is provided with 8 circulating flue gas injection ports.

[0021] As a further solution of the present invention: the two-stage heat exchanger, cooling tower and dust collector in the flue gas treatment system are used to cool the flue gas and collect dust.

[0022] A regulation method coupled with a low-carbon combustion process, the specific steps of the regulation method are as follows:

[0023] (1) The fuel supply system delivers gaseous fuel to the burner inlet through a gas regulating valve group; solid fuel is fed through a powder metering scale and the fuel is delivered by a fan; liquid fuel is delivered by an oil pump and a flow control system is set up to adjust the amount of liquid fuel. According to experimental needs, burners of different structures are configured to achieve single or mixed combustion of fuels;

[0024] (2) By adjusting the gas mixer, the ratio of CO2, O2, and N2 is infinitely adjusted according to the standard of adjusting the content of each gas within the range of 5% to 99%, and the gases are mixed. The mixed gas is then transported to the combustion furnace through a pipeline, or mixed with air from the air supply system and then transported to the combustion furnace;

[0025] (3) The internal insulation material of the combustion furnace is divided into two parts, the lower part uses mullite insulation bricks and high-temperature calcium aluminum silicate boards; the other parts of the upper part use high-temperature spray coatings, polycrystalline mullite blocks and zirconium-containing fiber modules;

[0026] (4) Using a high-temperature circulating fan, the flue gas after primary cooling is transported back to the front end of the combustion furnace. When conducting flue gas circulation experiments, the CO2 content in the furnace can be increased, CO2 enrichment can be achieved, and conditions for CO2 capture can be provided. The circulating flue gas temperature is adjusted by the cooling tower, and a total of 16 circulating flue gas injection ports are set at the front end of the combustion furnace, with 8 in the outer circle away from the flame and 8 in the inner circle close to the flame, to ensure that the circulating flue gas is evenly distributed in the furnace and that the circulating flue gas directly participates in the combustion;

[0027] (5) The flue gas treatment system is used to cool the flue gas and collect dust to meet emission requirements.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] It can not only give full play to the low-carbon advantages of alternative fuels, but also use oxygen-enriched / full-oxygen combustion to improve combustion efficiency and reduce carbon emissions. At the same time, it uses flue gas circulation to control pollutant generation and CO2 enrichment, and realize the synergy between different processes, thereby effectively overcoming the drawbacks of single process application on the existing platform, and providing a new solution for the low-carbon, high-efficiency and clean industrial combustion process, and organically coupling multiple low-carbon combustion processes such as alternative fuel combustion, oxygen-enriched / full-oxygen combustion, and flue gas circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0031] Figure 1 This is a system block diagram of a device coupled with a low-carbon combustion process and its adjustment method proposed by the present invention;

[0032] Figure 2 This is a diagram of the internal insulation structure of a multi-fuel combustion furnace in a device coupled with a low-carbon combustion process and an adjustment method thereof proposed by the present invention;

[0033] Figure 3 This is a diagram of the circulating flue gas inlet form in a device coupled with a low-carbon combustion process and its adjustment method proposed by the present invention.

[0034] In the figure: 1. Oxygen-enriched / full oxygen supply system; 101. Gas mixer; 2. Air supply system; 3. Gas fuel supply system; 301. Gas regulating valve group; 4. Solid fuel supply system; 401. Powder metering scale; 5. Liquid fuel supply system; 501. Oil pump; 502. Flow control system; 6. Flue gas circulation system; 601. High-temperature circulation fan; 7. Flue gas treatment system; 701. Two-stage heat exchanger; 702. Cooling tower; 703. Dust collector; 8. Fuel combustion system; 801. Combustion furnace; 802. Circulating flue gas inlet. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0037] Example

[0038] See also Figure 1-3 , the present invention provides a technical solution: a device coupled with a low-carbon combustion process and a regulation method thereof, comprising a fuel supply system for providing solid, liquid, and gaseous three-phase fuel, an oxygen-enriched / full oxygen supply system 1, an air supply system 2, a flue gas circulation system 6, a fuel combustion system 8, and a flue gas treatment system 7;

[0039] The fuel supply system can provide gaseous fuels such as natural gas and hydrogen, solid fuels such as pulverized coal and solid biomass pellets, and liquid fuels such as fuel oil and diesel. Gaseous fuel is delivered to the burner inlet via the gas regulating valve assembly 301; solid fuel is fed via a powder metering scale 401 and delivered using a blower; liquid fuel is delivered using an oil pump 501, and a flow control system 502 is provided to adjust the liquid fuel volume. Each fuel can be burned separately, or, depending on experimental needs, burners of different structures can be configured to supply two fuels simultaneously for mixed combustion.

[0040] The oxygen-enriched / full oxygen supply system 1 is combined with the air supply system 2 to change the combustion atmosphere in the combustion furnace 801, enabling the conduction of oxygen-enriched or full oxygen combustion experiments. By adjusting the gas mixer 101, the ratio of CO2, O2, and N2 can be infinitely adjusted, and the adjustment ratio of each gas content is 5% to 99%. The mixed gas can be directly delivered to the combustion furnace 801 through the pipeline, or it can be mixed with the air from the air supply system 2 and then delivered to the combustion furnace 801;

[0041] The fuel combustion system 8 consists of a combustion furnace 801, an online flue gas analyzer, a temperature, pressure, and flow detection device, etc., which can meet various fuel combustion requirements and monitor temperature distribution, flue gas components and content during the combustion process. The combustion furnace 801 is provided with an observation window, and the combustion flame shape can be observed with the naked eye or a high-speed camera. In order to reduce the overall weight of the combustion furnace 801 and to achieve the cleaning of incompletely burned solid and liquid fuels, the combustion furnace 801 divides the internal insulation material into two parts, the lower 120° range uses mullite insulation bricks + high-temperature calcium aluminum silicate board; the other parts of the upper part use high-temperature spray coating, polycrystalline mullite blocks and zirconium-containing fiber modules, such as Figure 2 As shown, it can meet the use requirement of combustion temperature of 1300℃, and the outer wall temperature of the furnace body is less than 60℃;

[0042] The high-temperature circulating fan 601 can be used to transport the flue gas after the first stage of cooling back to the front end of the combustion furnace 801. Experimental research on flue gas circulation can be carried out to increase the CO2 content in the furnace, achieve CO2 enrichment, and provide conditions for CO2 capture. The circulating flue gas temperature can be adjusted by the cooling tower 702. There are 16 circulating flue gas injection ports 802 at the front end of the combustion furnace 801, 8 of which are in the outer circle away from the flame and 8 in the inner circle close to the flame. The structure is as follows: Figure 3 As shown, the circulating flue gas is ensured to be evenly distributed in the furnace and to enable the circulating flue gas to directly participate in combustion; the flue gas treatment system 7 includes a two-stage heat exchanger 701, a cooling tower 702 and a dust collector 703, which cools the flue gas and collects dust to meet emission requirements.

[0043] The main feature of this invention is the innovative organic coupling of multiple low-carbon combustion processes such as alternative fuel combustion, oxygen-enriched / full oxygen combustion, and flue gas circulation; by rationally designing the device structure, the synergy between different processes is achieved, which can not only give full play to the low-carbon advantages of alternative fuels, but also use oxygen-enriched or full oxygen combustion to improve combustion efficiency and reduce carbon emissions. At the same time, with the help of flue gas circulation, pollutant generation and CO2 enrichment are controlled, thereby effectively overcoming the drawbacks of the existing platform's single process application and providing a new solution for the low-carbon, high-efficiency and clean industrial combustion process.

[0044] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes various replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device coupled with a low-carbon combustion process, characterized in that: It includes a fuel supply system, an oxygen-enriched / full oxygen supply system (1), an air supply system (2), a flue gas circulation system (6), a fuel combustion system (8), and a flue gas treatment system (7); The fuel supply system comprises a gas fuel supply system (3), a solid fuel supply system (4) and a liquid fuel supply system (5), and is used to provide solid, liquid and gas three-phase fuel; The oxygen-enriched / full oxygen supply system (1) is combined with the air supply system (2) to change the combustion atmosphere in the combustion furnace (801); The flue gas treatment system (7) comprises a two-stage heat exchanger (701), a cooling tower (702) and a dust collector (703); The fuel combustion system (8) is composed of a combustion furnace (801), an online flue gas analyzer, and a temperature, pressure, and flow rate detection device.

2. The device coupled with a low-carbon combustion process according to claim 1, characterized in that: The specific steps of the gas fuel supply system (3), the solid fuel supply system (4) and the liquid fuel supply system (5) providing solid, liquid and gas three-phase fuels are as follows: The gas fuel is delivered to the burner inlet through the gas regulating valve group (301); Solid fuel is fed through a powder metering scale (401), and the fuel is transported by the blowing of a fan; The liquid fuel is delivered by an oil pump (501), and a flow regulating system (502) is provided to regulate the amount of the liquid fuel.

3. The device coupled with a low-carbon combustion process according to claim 1, characterized in that: The specific steps of combining the oxygen-enriched / full oxygen supply system (1) with the air supply system (2) to change the combustion atmosphere in the combustion furnace (801) are as follows: By adjusting the gas mixer (101), the ratio of CO2, O2 and N2 is infinitely adjusted, and the adjustment ratio of each gas content is 5% to 99%. The mixed gas is transported in two ways: S1, directly transported to the combustion furnace (801) through the pipeline; S2, after being mixed with the air from the air supply system (2), it is transported to the combustion furnace (801) to realize the oxygen-enriched / full oxygen combustion experiment.

4. The device coupled with a low-carbon combustion process according to claim 1, characterized in that: The combustion furnace (801) is provided with an observation window. The internal insulation material of the combustion furnace (801) is divided into an upper and a lower part. The lower part of the combustion furnace (801) is filled with mullite insulation bricks and high-temperature calcium aluminum silicate boards, and the upper part of the combustion furnace (801) is filled with high-temperature spray coating, polycrystalline mullite blocks and zirconium-containing fiber modules.

5. The device coupled with a low-carbon combustion process according to claim 1, characterized in that: A total of 16 circulating flue gas injection ports (802) are provided at the front end of the combustion furnace (801), and the 16 circulating flue gas injection ports (802) are respectively located at an outer circle away from the flame and an inner circle close to the flame, wherein each position is provided with 8 circulating flue gas injection ports (802).

6. The device coupled with a low-carbon combustion process according to claim 1, characterized in that: The two-stage heat exchanger (701), the cooling tower (702) and the dust collector (703) in the flue gas treatment system (7) are used to cool the flue gas and collect dust.

7. A regulation method coupled with a low-carbon combustion process, characterized in that: The specific steps of this adjustment method are as follows: (1) The fuel supply system delivers gaseous fuel to the burner inlet through the gas regulating valve group (301); solid fuel is fed through the powder metering scale (401), and the fuel is delivered by the fan; the oil pump (501) is used to deliver liquid fuel, and a flow regulating system (502) is set to adjust the amount of liquid fuel. According to the experimental needs, burners with different structures are configured to achieve single fuel combustion or mixed combustion; (2) by adjusting the gas mixer (101), the ratio of CO2, O2, and N2 is infinitely adjusted according to the standard of adjusting the content of each gas to 5% to 99%, and the gases are mixed, and the mixed gas is then transported to the combustion furnace (801) through a pipeline, or mixed with air from the air supply system (2) and then transported to the combustion furnace (801); (3) The internal insulation material of the combustion furnace (801) is divided into two parts, the lower part adopts mullite insulation bricks and high-temperature calcium aluminum silicate boards; the other parts of the upper part adopt high-temperature spray coating, polycrystalline mullite blocks and zirconium-containing fiber modules; (4) Using a high-temperature circulating fan (601), the flue gas after primary cooling is transported back to the front end of the combustion furnace (801). When conducting flue gas circulation experiments, the CO2 content in the furnace can be increased, CO2 enrichment can be achieved, and conditions for CO2 capture can be provided. The circulating flue gas temperature is adjusted by a cooling tower (702), and a total of 16 circulating flue gas injection ports (802) are set at the front end of the combustion furnace (801), with 8 in the outer circle away from the flame and 8 in the inner circle close to the flame, to ensure that the circulating flue gas is evenly distributed in the furnace and that the circulating flue gas directly participates in the combustion; (5) The flue gas treatment system (7) is used to cool the flue gas and collect dust to meet emission requirements.

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