Hydrogen combustion device and method for heat accumulating type heating furnace

Abstract

The hydrogen combustion device comprises a heating furnace body, regenerative burners, hydrogen burners, a drainage device, a gas inlet and smoke exhaust pipeline and a heat accumulator bottom plate, the hydrogen burners and the regenerative burners are arranged on the two sides of the heating furnace body in pairs respectively, the gas inlet and smoke exhaust pipeline is connected to the upper ends of the regenerative burners, and the gas inlet and smoke exhaust pipeline is connected to the lower ends of the regenerative burners. A heat accumulator bottom plate is arranged at the bottom of a heat accumulator in the heat accumulating type burner, the heat accumulator bottom plate is of a grid structure, and the lower end of the heat accumulator bottom plate is connected with a drainage device. Compared with the prior art, the method has the beneficial effects that CO2 emission of iron and steel enterprises can be effectively reduced, emission of harmful gases and dust such as nitrogen oxides and sulfides is reduced, effective recovery of combustion products is realized, the combustion products can be reused, and environmental protection is realized. And powerful technical and equipment support is provided for green and environment-friendly sustainable development of enterprises.

Description

Technical Field

[0001] The present invention belongs to the technical field of metallurgical manufacturing, and particularly relates to a hydrogen combustion device and method for a regenerative heating furnace. Background Art

[0002] The metallurgical industry is a typical high-energy-consuming and high-carbon-emission industry, facing severe carbon emission reduction pressure. As a clean energy, hydrogen energy is one of the most effective ways to reduce carbon emissions in iron and steel enterprises.

[0003] At present, although the traditional regenerative combustion technology in the metallurgical industry can effectively reduce the fuel consumption of the heating furnace and maximize the recovery of the physical heat carried out by the flue gas discharged from the furnace. However, it cannot overcome the environmental pollution problems caused by harmful gases and dust such as CO2, nitrogen oxides, and sulfides discharged from the flue gas. Therefore, the present invention proposes a combustion technology using hydrogen energy applicable to industrial furnaces such as regenerative heating furnaces and forging furnaces in the metallurgical industry. This technology can fundamentally reduce the carbon emission problems of regenerative heating furnaces, forging furnaces and other industrial furnaces in the metallurgical industry, reduce the emissions of harmful substances such as nitrogen oxides and sulfides and dust, and at the same time, can realize the recycling of combustion products. Summary of the Invention

[0004] The present invention provides a hydrogen combustion device and method for a regenerative heating furnace, aiming to effectively reduce carbon emissions in iron and steel enterprises, realize the effective recovery of the combustion product water, and can be reused.

[0005] To achieve the above object, the present invention is implemented by the following technical solutions:

[0006] A hydrogen combustion device for a regenerative heating furnace includes a heating furnace body, a regenerative burner, a hydrogen burner, a drainage device, an intake and exhaust pipe, and a regenerator bottom plate. On both sides of the heating furnace body, a hydrogen burner and a regenerative burner are respectively arranged in pairs. The upper end of the regenerative burner is connected to the intake and exhaust pipe. At the bottom of the regenerator in the regenerative burner, a regenerator bottom plate is provided. The regenerator bottom plate is a grid structure, and the lower end of the regenerator bottom plate is connected to the drainage device.

[0007] The regenerator bottom plate is made of high-temperature resistant waterproof material.

[0008] The drainage device includes a drainage tank, a drainage valve, a drainage branch pipe, and a drainage main pipe. The drainage tank has an inclined bottom surface. At the lowest point of the inclined bottom surface, the drainage branch pipe is connected. A plurality of drainage branch pipes are connected to the drainage main pipe.

[0009] The inclination angle of the drainage tank is not greater than 20°.

[0010] A method for using a hydrogen combustion device of a regenerative heating furnace specifically includes: the hydrogen burners on both sides of the heating furnace body are used alternately. When the regenerative burner on one side of the heating furnace body is burning, the combustion-supporting air enters the furnace chamber of the heating furnace body through the intake and exhaust pipeline and the regenerative burner, and the hydrogen entering through the hydrogen burner arranged in pairs with the regenerative burner mixes and burns with the combustion-supporting air in the furnace; at this time, the regenerative burner on the other side discharges smoke, and the hydrogen burner on that side is closed; then reverse combustion is carried out, and the regenerative burners and hydrogen burners on both sides of the heating furnace body are reversely switched synchronously.

[0011] When the regenerative burner on one side of the heating furnace body is burning and the flue gas is discharged through the regenerative burner on the other side, the heat of the flue gas is absorbed by the regenerator arranged above the regenerator bottom plate in the regenerative burner on that side. While the temperature of the flue gas decreases, water will overflow. The water overflowing from the flue gas seeps out through the regenerator bottom plate and is discharged through the drainage device. The cooled flue gas is discharged through the intake and exhaust pipeline.

[0012] The cycle for the synchronous reversal of the regenerative burners and hydrogen burners on both sides of the heating furnace body is 60 ± 10 seconds.

[0013] The temperature of the flue gas discharged through the intake and exhaust pipeline is not higher than 210 °C.

[0014] The temperature of the flue gas discharged through the intake and exhaust pipeline is controlled at 180 - 210 °C.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The proposal and application of the present invention can effectively reduce the CO2 emissions of iron and steel enterprises, reduce the emissions of harmful gases and dust such as nitrogen oxides and sulfides, realize the effective recovery of combustion products, which can be reused, and provide strong technical and equipment support for the enterprise to achieve green, environmental-friendly and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the device of the present invention.

[0018] Figure 2 is Figure 1 a side view of

[0019] In the figure: 1 - heating furnace body, 2 - regenerative burner, 3 - intake and exhaust pipeline, 4 - regenerator bottom plate, 5 - drainage trough, 6 - drain valve, 7 - main drainage pipeline, 8 - drainage branch pipeline, 9 - hydrogen burner. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following further describes the specific embodiments of the present invention with reference to the drawings.

[0021] This invention is based on the existing regenerative combustion technology. The main purpose is to reduce the emissions of harmful gases and dust, especially CO2 emissions, from industrial furnaces such as regenerative heating furnaces and forging furnaces in metallurgical enterprises. The specific implementation methods are as follows:

[0022] See Figure 1 、 Figure 2 , a hydrogen combustion device for a regenerative heating furnace, comprising a heating furnace body 1, regenerative burners 2, hydrogen burners 9, a drainage device, an intake and exhaust gas pipeline 3, and a regenerator bottom plate 4. On both sides of the heating furnace body 1, hydrogen burners 9 and regenerative burners 2 are arranged in pairs respectively. The upper end of the regenerative burner 2 is connected to the intake and exhaust gas pipeline 3. At the bottom of the regenerator in the regenerative burner 2, there is a regenerator bottom plate 4. The regenerator bottom plate 4 is of a grid structure, and the lower end of the regenerator bottom plate 4 is connected to the drainage device.

[0023] The regenerator bottom plate is made of high-temperature resistant waterproof materials, such as SUS 314 stainless steel, AISI 310S stainless steel, etc.

[0024] The drainage device includes a drainage trough 5, a drainage valve 6, drainage branch pipelines 8, and a drainage main pipeline 7. The drainage trough 5 has an inclined bottom surface. At the lowest point of the inclined bottom surface, the drainage branch pipeline 8 is connected. A number of drainage branch pipelines 8 are connected to the drainage main pipeline 7.

[0025] The inclination angle (the angle with the horizontal plane) of the drainage trough 5 is not greater than 20°.

[0026] A usage method of a hydrogen combustion device for a regenerative heating furnace specifically includes: the hydrogen burners 9 on both sides of the heating furnace body 1 are used alternately. When the regenerative burner 2 on one side of the heating furnace body 1 is burning, combustion-supporting air enters the furnace chamber of the heating furnace body 1 through the intake and exhaust gas pipeline 3 and the regenerative burner 2, and the hydrogen entering through the hydrogen burner 9 arranged in pairs with this regenerative burner 2 mixes and burns with the combustion-supporting air in the furnace; at this time, the regenerative burner 2 on the other side discharges smoke, and the hydrogen burner 9 on that side is closed; then reverse combustion is carried out, and the regenerative burners 2 and hydrogen burners 9 on both sides of the heating furnace body 1 are reversely switched synchronously.

[0027] When the regenerative burner 2 on one side of the heating furnace body 1 is burning and the flue gas is discharged through the regenerative burner 2 on the other side, the heat of the flue gas is absorbed by the regenerator in the regenerative burner 2 on that side, and the temperature of the flue gas drops significantly. The discharged flue gas is the combustion product of hydrogen and air, and the main component is water. While the temperature of the flue gas drops, a large amount of water overflows from the regenerator, seeps out through the regenerator bottom plate 4, and is then discharged through the drainage device. The cooled flue gas is discharged through the intake and exhaust gas pipeline 3.

[0028] The period for synchronous commutation of the regenerative burners 2 on both sides of the heating furnace body 1 and the hydrogen burners 9 is 60 ± 10 seconds.

[0029] The temperature of the flue gas discharged through the intake and exhaust pipe 3 is not higher than 210°C.

[0030] The exhaust temperature of the intake and exhaust pipe 3 is determined by factors such as the production rhythm and furnace conditions of industrial furnaces such as heating furnaces and forging furnaces, and is generally controlled between 180 and 210°C, or lower.

[0031] Example 1: Take a continuous rolling heating furnace with a rated output of 180 t / h as an example.

[0032] Such as Figure 1 And Figure 2As shown in the figure, the device consists of a heating furnace body 1, regenerative burners 2, air intake and flue gas discharge pipes 3, regenerator bottom plates 4, drain troughs 5, drain valves 6, main drain pipes 7, drain branch pipes 8, and hydrogen burners 9. Among them, when the regenerative burner 2 is burning, the air intake and flue gas discharge pipe 3 is used as the pipe for the combustion-supporting air to enter. When the regenerative burner 2 is not burning, it is used as the flue gas discharge pipe. Its working principle is that the regenerative burner 2 and the hydrogen burner 9 are installed in pairs on the heating furnace body 1. When the regenerative burner 2 on the A side is burning, the combustion-supporting air enters the furnace through the air intake and flue gas discharge pipe 3 and mixes with the hydrogen entering the furnace through the hydrogen burner 9 on the A side for combustion in the furnace. The regenerative burner 2 on the B side discharges flue gas, and the flue gas is discharged from the furnace body through the air intake and flue gas discharge pipe 3 on the B side. At this time, the hydrogen burner 9 on the B side is closed. After a period of commutation, when the regenerative burner 2 on the B side is burning, the hydrogen burner 9 on the B side is opened, and the combustion-supporting air enters the furnace of the heating furnace body 1 through the air intake and flue gas discharge pipe 3 on the B side to mix with hydrogen for combustion. The regenerative burner 2 on the A side discharges flue gas, and the flue gas is discharged from the furnace body through the air intake and flue gas discharge pipe 3 on the A side, and the hydrogen burner 9 on the A side is closed. The flue gas discharge temperature of the air intake and flue gas discharge pipe 3 is controlled at 200 °C. The synchronous commutation period of the hydrogen burner 9 and the regenerative burner 2 is set to 60 seconds. When the regenerative burner 2 on the A side is burning, the drain valve 6 on the same side is closed. The drain valve 6 on the B side is opened, and the flue gas is discharged through the regenerative burner 2 on the B side. Its heat is absorbed by the regenerator in the regenerative burner 2, and the temperature drops significantly. The discharged flue gas is the combustion product of hydrogen and air, and its main component is water. When the flue gas temperature drops, a large amount of water will overflow. The overflowing water is discharged through the regenerator bottom plate 4. The regenerator bottom plate 4 uses a grid-structured high-temperature resistant waterproof material, and above it is the honeycomb ceramic regenerator in the regenerative burner 2. The regenerator chamber box below the regenerator bottom plate 4 is transformed into a drain trough 5 with an inclination angle of 20°. The water enters the drain branch pipe 8 from the drain trough 5, passes through the drain valve 6 and converges into the main drain pipe 7, and is sent to the water storage tank for recycling through the main drain pipe 7. The remaining gas after the flue gas heat exchange is discharged from the air intake and flue gas discharge pipe 3 on the B side. The structure of the regenerative burner 2 on the A side is the same as that on the B side. When the regenerative burner 2 on the A side discharges flue gas, the method of discharging and collecting the water overflowing from the flue gas is exactly the same as that on the B side. When the regenerative burner 2 on the B side is burning, the drain valve 6 below is in the closed state.

[0033] The hydrogen supply volume in this embodiment is about 8000 m 3 / h, the air consumption coefficient is 1.05, the consumed air volume is about 20000 m 3 / h, about 6.4 tons of water is generated in the flue gas, basically eliminating CO2 emissions, and the generated water can be completely recycled.

[0034] Example 2: Taking a chamber-type forging heating furnace with a rated output of 80 t / h as an example, the device structure and working mode of this embodiment are the same as those of Example 1.

[0035] The hydrogen supply volume in this embodiment is about 3000 m 3 / h, the air consumption coefficient is 1.1, and the consumed air volume is about 7857 m 3 / h. About 2.4 tons of water is generated in the flue gas, and CO2 emissions are basically eliminated. The generated water can be completely recycled and utilized.

Claims

1. A hydrogen combustion device for a regenerative heating furnace, characterized in that, It includes a heating furnace body, regenerative burners, hydrogen burners, a drainage device, an intake and exhaust pipe, and a regenerator bottom plate. The hydrogen burners and regenerative burners are arranged in pairs on both sides of the heating furnace body respectively. The upper end of the regenerative burner is connected to the intake and exhaust pipe. The regenerator bottom plate is arranged at the bottom of the regenerator in the regenerative burner. The regenerator bottom plate is of a grid structure, and the lower end of the regenerator bottom plate is connected to the drainage device.

2. The hydrogen combustion device of a regenerative heating furnace according to claim 1, characterized in that, The regenerator bottom plate is made of high-temperature resistant waterproof material.

3. The hydrogen combustion device of a regenerative heating furnace according to claim 1, characterized in that, The drainage device includes a drainage trough, a drain valve, drainage branch pipes, and a main drainage pipe. The drainage trough has an inclined bottom surface. The drainage branch pipe is connected to the lowest point of the inclined bottom surface. A plurality of drainage branch pipes are connected to the main drainage pipe.

4. The hydrogen combustion device of a regenerative heating furnace according to claim 3, characterized in that, The inclination angle of the drainage trough is not greater than 20°.

5. A method for using the hydrogen combustion device of the regenerative heating furnace according to any one of claims 1-4, characterized in that, Specifically, it includes: The hydrogen burners on both sides of the heating furnace body are used alternately. When the regenerative burner on one side of the heating furnace body burns, the combustion-supporting air enters the furnace chamber of the heating furnace body through the intake and exhaust pipe and the regenerative burner. The hydrogen entering through the hydrogen burner arranged in pairs with this regenerative burner mixes and burns with the combustion-supporting air in the furnace. At this time, the regenerative burner on the other side exhausts smoke, and the hydrogen burner on that side is closed. Then, reverse combustion is carried out, and the regenerative burners and hydrogen burners on both sides of the heating furnace body are reversely switched synchronously. When the regenerative burner on one side of the heating furnace body burns and the flue gas is discharged through the regenerative burner on the other side, the heat of the flue gas is absorbed by the regenerator in the regenerative burner on that side. While the temperature of the flue gas decreases, water overflows from the regenerator, seeps out through the regenerator bottom plate, and is then discharged through the drainage device. The cooled flue gas is discharged through the intake and exhaust pipe.

6. The usage method of a hydrogen combustion device for a regenerative heating furnace according to claim 5, characterized in that, The period for the synchronous reversal of the regenerative burners and hydrogen burners on both sides of the heating furnace body is 60 ± 10 seconds.

7. The method of using a hydrogen combustion device for a regenerative heating furnace according to claim 5, characterized in that, The temperature of the flue gas discharged through the intake and exhaust pipe is not higher than 210°C.

8. The method of using a hydrogen combustion device for a regenerative heating furnace according to claim 7, characterized in that, The temperature of the flue gas discharged through the intake and exhaust pipe is controlled at 180 - 210°C.

Images