A comprehensive device that uses waste heat from kilns to produce hydrogen for power generation, heating, drying, and hot water

Abstract

The present invention provides a comprehensive device for utilizing waste heat flue gas from a kiln to produce hydrogen for power generation, heating, drying, and hot water, and relates to the application of waste heat flue gas, especially the application field of waste heat flue gas for hydrogen generation and power generation. It comprises a mixed liquid storage tank, a heat accumulator, and a hydrogen buffer tube. The heat accumulator is equipped with a superheating coil and a tube array. The mixed liquid storage tank is equipped with a hydrogen buffer tube. The mixed liquid storage tank is equipped with a ventilator. The liquid outlet of the mixed liquid storage tank is connected to a No. 1 metering pump via a No. 1 pipeline. A liquid outlet valve is installed on the No. 1 pipeline. The No. 1 metering pump is connected to the inlet end of the superheating coil via a No. 2 pipeline. A pressure gauge and a protective gas valve are installed on the No. 2 pipeline. The present invention realizes the practical use of utilizing waste heat flue gas from a kiln to produce hydrogen for power generation, and using the waste gas after power generation for combustion, heating, and drying, thereby reducing the cost of combustion and power generation, and meeting the national requirements for energy conservation, consumption reduction, and emission reduction.

Description

Technical Field

[0001] The present invention provides a comprehensive device for utilizing waste heat flue gas from a kiln to produce hydrogen for power generation, heating, drying, and hot water, and relates to the application of waste heat flue gas, especially the application field of waste heat flue gas for hydrogen generation and power generation. Background Art

[0002] Methanol-to-hydrogen production refers to the process of mixing methanol with water vapor and then subjecting it to a catalyst under certain temperature and pressure conditions, causing the methanol to undergo a cracking reaction and ultimately produce hydrogen and carbon dioxide. The methanol-water vapor mixture is heated and catalytically converted in a reformer to produce hydrogen and carbon dioxide. The reaction equation is as follows:

[0003] Main reaction:

[0004] CH3OH=CO+2H2↑+90.7KJ / mol

[0005] CO+H2O=CO2+H2↑-41.2KJ / mol

[0006] Side effects:

[0007] 2CH3OH=CH3OCH3+H2O↑+24.9KJ / mol

[0008] CO+3H2↑=CH4↑+H2O↑+206.3KJ / mol

[0009] The industrial method for producing hydrogen from methanol involves mixing methanol and desalted water in a specific ratio and feeding it into a vaporizer for vaporization. The vaporized methanol vapor is then superheated in a superheater and fed into a converter, where a catalyst is installed. The methanol vapor undergoes a cracking reaction inside the converter, producing hydrogen and carbon dioxide. This process requires thermal oil, a thermal oil pump, and its associated power consumption, and the equipment occupies a large area. In real life, waste heat from furnaces is mostly discharged into the air, wasting the energy released within the waste heat. Currently, methanol-to-hydrogen production is a self-absorbent reaction. If we can effectively utilize the waste heat from the flue gas for this self-absorbent reaction, we can eliminate the need for external energy sources such as natural gas, liquefied petroleum gas, and electricity. We can also cleverly use the resulting mixture to generate electricity before combustion. Therefore, we propose a comprehensive device that utilizes waste heat from furnace flue gas to produce hydrogen for power generation, heating, drying, and hot water. Summary of the Invention

[0010] The present invention provides a comprehensive device for utilizing waste heat flue gas from a kiln to produce hydrogen for power generation, heating, drying, and hot water. This device realizes the practical use of utilizing waste heat flue gas from a kiln to produce hydrogen for power generation, and using the waste gas after power generation for combustion for heating and drying, thereby reducing combustion and power generation costs and complying with national requirements for energy conservation, consumption reduction, and emission reduction.

[0011] The present invention provides a comprehensive device for generating electricity, heating, drying and hot water by using waste heat and flue gas from a kiln, comprising a mixed liquid storage tank, a heat accumulator and a hydrogen buffer tube. The heat accumulator is equipped with a superheated coil and a tube array. The mixed liquid storage tank is equipped with a hydrogen buffer tube. The mixed liquid storage tank is equipped with a ventilator. The liquid outlet end of the mixed liquid storage tank is connected to a No. 1 metering pump through a No. 1 pipeline. A liquid outlet valve is installed on the No. 1 pipeline. The No. 1 metering pump is connected to the inlet end of the superheated coil through a No. 2 pipeline. The No. 2 pipeline is equipped with a liquid outlet valve. The No. 1 metering pump is connected to the inlet end of the superheated coil through a No. 2 pipeline. A pressure gauge and a protective gas valve are installed on the line. The outlet end of the superheated coil is connected to the inlet end of the tube through a connecting pipeline equipped with a tube inlet valve. The outlet end of the tube is connected to the inlet end of the hydrogen buffer tube through a connecting pipeline equipped with a tube outlet valve. The outlet end of the hydrogen buffer tube is connected to a flame arrester through a connecting pipeline. The flame arrester is connected to a generator through a connecting pipeline. The other end of the generator is connected to a hydrogen combustion gas splitter. The outlet ends on both sides of the hydrogen combustion gas splitter are connected to external equipment.

[0012] Furthermore, the tubes are filled with a catalyst.

[0013] Furthermore, a waste heat flue gas inlet is installed at the air inlet end of the heat accumulator, and the waste heat flue gas inlet is connected to the waste heat flue gas of an external kiln through a connecting pipeline.

[0014] Furthermore, a waste heat flue gas outlet is installed at the gas outlet end of the heat accumulator, and the waste heat flue gas outlet is connected to an external chimney through a connecting pipeline.

[0015] Furthermore, a coil inlet valve is installed on the second pipeline and on a side close to the superheating coil.

[0016] Furthermore, a No. 1 metering pump control valve is installed on the side of the No. 1 pipeline close to the No. 1 metering pump, and a No. 2 metering pump is installed on the side of the No. 2 pipeline close to the No. 1 metering pump. The No. 2 metering pump and the liquid outlet valve are connected through the No. 3 pipeline, and the No. 2 metering pump control valve is installed on the No. 3 pipeline.

[0017] Furthermore, a buffer tube valve is installed on the connecting pipeline between the tube array and the hydrogen buffer tube and on a side close to the hydrogen buffer tube.

[0018] Furthermore, a hydrogen outlet control valve and a hydrogen inlet control valve for the generator are sequentially connected to the connecting pipeline between the flame arrester and the generator.

[0019] Furthermore, the external equipment includes a kiln and a heating and drying furnace, and the two ends of the hydrogen combustion gas splitter are connected to the kiln and the heating and drying furnace through connecting pipelines, and the kiln control valve and the heating and drying furnace control valve are respectively installed on the connecting pipelines on both sides.

[0020] Furthermore, the other inlet end of the mixed liquid storage tank is connected to a mixed liquid inlet pipeline.

[0021] Furthermore, the hydrogen buffer tube is connected to a sewage pipe, and a safety valve is installed on the hydrogen buffer tube.

[0022] Beneficial effects of the present invention:

[0023] In this invention, waste heat flue gas is used to produce hydrogen, achieving the combined functions of power generation, reheating, and drying and combustion. The waste heat flue gas is used as the heat source for hydrogen production to undergo a self-absorbent reaction. The resulting mixed gas drives a generator to generate electricity, and the remaining gas is then burned for heating and drying. This reduces environmental pollution and enables the reuse of waste heat flue gas.

[0024] This invention utilizes waste heat from the kiln to meet the required 220-250°C temperature for hydrogen production, eliminating the need for natural gas, liquefied gas, or electricity for heating hydrogen production, thus saving energy and reducing consumption. It also eliminates the need for a thermal oil heat transfer circulation system. This reduces combustion and power generation costs, meeting national energy conservation, consumption reduction, and emission reduction requirements, with all indicators exceeding national environmental protection standards. This makes hydrogen energy visible and tangible, enabling practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a comprehensive equipment provided by the present invention that utilizes waste heat and flue gas from a kiln to produce hydrogen for power generation, heating, drying, and hot water.

[0026] 1. Waste heat flue gas; 2. Waste heat flue gas inlet; 3. Regenerator; 4. Waste heat flue gas outlet; 5. Chimney; 6. Tubing; 7. Superheat coil; 8. Tubing inlet valve; 9. Tubing outlet valve; 10. Metering pump No. 1; 11. Metering pump No. 2; 12. Pressure gauge; 13. Protective gas valve; 14. Coil inlet valve; 15. Liquid outlet valve; 16. Metering pump No. 1 control valve; 17. Metering pump No. 2 control valve; 18. Buffer pipe valve; 19. Mixed liquid storage tank; 20. Hydrogen buffer pipe; 21. Safety valve; 22. Ventilator; 23. Mixed liquid inlet pipeline; 24. Flame arrester; 25. Hydrogen outlet control valve; 26. Hydrogen inlet generator control valve; 27. Generator; 28. Hydrogen combustion gas diverter; 29. Kiln control valve; 30. Heating and drying furnace control valve; 31. Sewage pipe DETAILED DESCRIPTION

[0027] The present invention provides a comprehensive device for generating electricity, heating, drying and hot water by using waste heat and flue gas from a kiln, comprising a mixed liquid storage tank 19, a heat accumulator 3 and a hydrogen buffer tube 20. The heat accumulator 3 is equipped with an overheating coil 7 and a tube 6. The mixed liquid storage tank 19 is equipped with a hydrogen buffer tube 20. The mixed liquid storage tank 19 is equipped with a ventilator 22. The liquid outlet of the mixed liquid storage tank 19 is connected to a metering pump 10 via a No. 1 pipeline. A liquid outlet valve 15 is installed on the No. 1 pipeline. The No. 1 metering pump 10 is connected to the inlet end of the overheating coil 7 via a No. 2 pipeline. The No. 2 pipeline is connected to the inlet end of the overheating coil 7 via a No. 2 pipeline. A pressure gauge 12 and a protective gas valve 13 are installed on the line. The outlet end of the superheated coil 7 is connected to the inlet end of the tube 6 through a connecting pipeline equipped with a tube inlet valve 8. The outlet end of the tube 6 is connected to the inlet end of the hydrogen buffer tube 20 through a connecting pipeline equipped with a tube outlet valve 9. The outlet end of the hydrogen buffer tube 20 is connected to a flame arrester 24 through a connecting pipeline. The flame arrester 24 is connected to a generator 27 through a connecting pipeline. The other end of the generator 27 is connected to a hydrogen combustion gas diverter 28. The outlet ends on both sides of the hydrogen combustion gas diverter 28 are connected to external equipment.

[0028] Specifically, a catalyst is contained in the tubes 6. Under the action of the catalyst, the vaporized and superheated mixed liquid undergoes a cracking reaction to produce hydrogen.

[0029] Specifically, the heat accumulator 3 has a waste heat flue gas inlet 2 installed at the air inlet end. This inlet 2 is connected to the waste heat flue gas 1 from an external kiln via a connecting pipeline. The waste heat flue gas 1 from the kiln enters the heat accumulator 3 through the waste heat flue gas inlet 2 for heat storage, thus reusing the waste heat flue gas 1.

[0030] Specifically, the outlet end of the heat accumulator 3 is provided with a waste heat flue gas outlet 4, which is connected to an external chimney 5 via a connecting pipeline. The waste heat flue gas 3 can store heat in the heat accumulator 3 and then be discharged from the waste heat flue gas outlet 4.

[0031] Specifically, a coil inlet valve 14 is installed on the second pipeline and on a side close to the superheating coil 7 .

[0032] Specifically, a No. 1 metering pump control valve 16 is installed on the side of the No. 1 pipeline close to the No. 1 metering pump 10, and a No. 2 metering pump 11 is installed on the side of the No. 2 pipeline close to the No. 1 metering pump 10. The No. 2 metering pump 11 and the liquid outlet valve 15 are connected through the No. 3 pipeline, and the No. 2 metering pump control valve 17 is installed on the No. 3 pipeline.

[0033] Specifically, a buffer tube valve 18 is installed on the connecting pipeline between the tube array 6 and the hydrogen buffer tube 20, near the hydrogen buffer tube 20. After the buffer tube valve 18 is opened, the produced hydrogen can flow from the tube array 6 through the connecting pipeline into the hydrogen buffer tube 20, where it is cooled.

[0034] Specifically, the connecting pipeline between the flame arrester 24 and the generator 27 is sequentially connected with a hydrogen outlet control valve 25 and a hydrogen inlet generator control valve 26 .

[0035] Specifically, the external equipment includes a kiln and a heating and drying furnace. The two ends of the hydrogen combustion gas splitter 28 are connected to the kiln and the heating and drying furnace through connecting pipelines, and a kiln control valve 29 and a heating and drying furnace control valve 30 are respectively installed on the connecting pipelines on both sides.

[0036] Specifically, the other inlet end of the mixed liquid storage tank 19 is connected to a mixed liquid inlet pipeline 23 . The mixed liquid is added into the mixed liquid storage tank 19 through the mixed liquid inlet pipeline 23 .

[0037] Specifically, the hydrogen buffer pipe 20 is connected to a drain pipe 31 , and a safety valve 21 is installed on the hydrogen buffer pipe 20 .

[0038] Working principle of the present invention

[0039] In the present invention, the waste heat flue gas 1 enters the heat accumulator 3 through the connecting pipeline and the waste heat flue gas inlet 2, and the mixed liquid of methanol and desalted water is added to the mixed liquid storage tank 19 through the mixed liquid inlet pipeline 23. The liquid outlet valve 15, the No. 1 metering pump control valve 16, the No. 2 metering pump control valve 17, the protective gas valve 13, and the coil inlet valve 14 are opened. The mixed liquid in the mixed liquid storage tank 19 enters the superheated coil 7 through the No. 1 pipeline, the No. 2 pipeline, and the No. 3 pipeline. After the vaporization and overheating of the superheated coil 7, water-methanol vapor is obtained. Then the tube inlet valve 8 is opened and the mixed liquid enters the tube 6 through the connecting pipeline. The tube 6 is equipped with a catalyst. Under the action of the catalyst, the water-methanol vapor is cracked. The reaction produces hydrogen and carbon dioxide, and the carbon dioxide can be discharged to the chimney through the waste heat flue gas outlet. The tube outlet valve 9 and the buffer pipe valve 18 are opened, and the hydrogen enters the hydrogen buffer pipe 20 through the connecting pipeline for cooling. After the cooling is completed, the hydrogen outlet control valve 25 is opened, and the hydrogen enters the generator control valve 26. The hydrogen acts on the generator 27 through the connecting pipeline to generate flameless electricity, and then is sent to various combustion points by the hydrogen combustion gas diverter 28, the kiln control valve 29, and the heating and drying furnace control valve 30, thereby realizing the practical use of using the waste heat flue gas from the kiln to produce hydrogen and generate electricity, and then using the waste gas after power generation for combustion, heating and drying, thereby reducing the combustion and power generation costs.

[0040] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A comprehensive device for producing hydrogen, power generation, heating, drying and hot water using waste heat from kiln flue gas, characterized by: The invention comprises a mixed liquid storage tank (19), a heat accumulator (3), and a hydrogen buffer pipe (20), wherein the heat accumulator (3) is provided with a superheating coil (7) and a tube (6), the mixed liquid storage tank (19) is provided with a hydrogen buffer pipe (20), the mixed liquid storage tank (19) is provided with a ventilator (22), the liquid outlet end of the mixed liquid storage tank (19) is connected to a No. 1 metering pump (10) through a No. 1 pipeline, the No. 1 pipeline is provided with a liquid outlet valve (15), the No. 1 metering pump (10) is connected to a No. 2 pipeline and a No. 3 pipeline. The inlet end of the heating coil (7) is connected, a pressure gauge (12) and a protective gas valve (13) are installed on the second pipeline, the outlet end of the superheating coil (7) is connected to the inlet end of the tube (6) through a connecting pipeline installed with a tube inlet valve (8), the outlet end of the tube (6) is connected to the inlet end of the hydrogen buffer tube (20) through a connecting pipeline installed with a tube outlet valve (9), the outlet end of the hydrogen buffer tube (20) is connected to a flame arrester (24) through a connecting pipeline, and the flame arrester (24) is connected to the inlet end of the hydrogen buffer tube (20) through a connecting pipeline. The connecting pipeline is connected to a generator (27), the other end of the generator (27) is connected to a hydrogen combustion gas splitter (28), both sides of the outlet end of the hydrogen combustion gas splitter (28) are connected to external equipment, the tube (6) is filled with a catalyst, the air inlet end of the heat accumulator (3) is installed with a waste heat flue gas inlet (2), and the waste heat flue gas inlet (2) is connected to the waste heat flue gas (1) of the external kiln through the connecting pipeline, and the No. 1 metering pump control valve (1) is installed on the side of the No. 1 pipeline close to the No. 1 metering pump (10). 6), a second metering pump (11) is installed on the side of the second pipeline close to the first metering pump (10), the second metering pump (11) and the liquid outlet valve (15) are connected through a third pipeline, and a second metering pump control valve (17) is installed on the third pipeline, the external equipment includes a kiln and a heating and drying furnace, the two ends of the hydrogen combustion gas splitter (28) are connected to the kiln and the heating and drying furnace through connecting pipelines, and a kiln control valve (29) and a heating and drying furnace control valve (30) are installed on the connecting pipelines on both sides.

2. The comprehensive equipment for producing hydrogen, power generation, heating, drying and hot water by utilizing waste heat and flue gas from kilns according to claim 1, characterized in that: A waste heat flue gas outlet (4) is installed at the gas outlet end of the heat accumulator (3), and the waste heat flue gas outlet (4) is connected to an external chimney (5) via a connecting pipeline.

3. The comprehensive equipment for producing hydrogen, power generation, heating, drying and hot water by utilizing waste heat and flue gas from kilns according to claim 1 is characterized in that: A coil inlet valve (14) is installed on the second pipeline at one side close to the superheating coil (7).

4. The comprehensive equipment for producing hydrogen, power generation, heating, drying and hot water by utilizing waste heat and flue gas from kilns according to claim 1 is characterized in that: A buffer tube valve (18) is installed on the connecting pipeline between the tube array (6) and the hydrogen buffer tube (20) and on a side close to the hydrogen buffer tube (20).

5. The comprehensive equipment for producing hydrogen, power generation, heating, drying and hot water by utilizing waste heat and flue gas from kilns according to claim 1 is characterized in that: The connecting pipeline between the flame arrester (24) and the generator (27) is sequentially connected with a hydrogen outlet control valve (25) and a hydrogen inlet generator control valve (26).

6. The comprehensive equipment for producing hydrogen, power generation, heating, drying and hot water by utilizing waste heat and flue gas from kilns according to claim 1 is characterized in that: The other inlet end of the mixed liquid storage tank (19) is connected to a mixed liquid inlet pipeline (23).

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