Adjustable furnace end supplementary heating device
By accurately adjusting the coke oven gas supply pipeline and supplementing heating device, the problems of low temperature of the coke oven head and excessive emissions of non-methane hydrocarbons are solved, and the temperature of the coke oven head and the improvement of coke quality are achieved.
Patent Information
- Application Number
- CN202422338120.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-09-25
AI Technical Summary
The low temperature of modern coke oven heads leads to a decrease in the quality of coke, and the replenishment heating system of the furnace head leads to incomplete combustion of coke oven gas, resulting in excess of the total non-methane hydrocarbon emissions, forming a vicious cycle.
The gas pressure is accurately adjusted through the bypass pipe of the coke oven gas supply pipeline and the replenished heating riser. Combined with the replenished heating small branch pipe valve, the amount of gas in the coke oven is micro-regulated to ensure the precise control of the gas entering the combustion chamber, preventing the gas from entering the descending airflow, and reducing incomplete combustion.
The stable control of the temperature of the coke oven head is achieved, the emission of non-methane substances is reduced, and the quality and environmental benefits of coke are improved.
Smart Images
Figure CN223304383U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an adjustable furnace head supplementary heating device, belonging to the technical field of coke oven heating equipment in the metallurgical industry. Background Art
[0002] Modern coke ovens are a relatively mature type of coke oven. They are downward-flow coke ovens designed based on China's original coke ovens. Their structural features include dual fire channels, exhaust gas recirculation, downward injection of coke oven gas, compartmentalized regenerators, and a reheating system with downward adjustment of lean gas and air. Carbonization chamber heights are available in 4.3m, 6.0m, and 7.0m. Compared to smaller coke ovens, modern large coke ovens offer advantages such as increased coal loading density, improved coke quality, improved environmental benefits, reduced pollutant leakage and emission sources, lower capital construction and maintenance costs for a comparable size, and a smaller footprint. As coke ovens age, they experience low burner head temperatures, resulting in uneven coke production, impacting coke quality, and further deteriorating coke oven conditions. To stabilize burner head temperatures, a supplementary heating system has been introduced to effectively maintain these temperatures and improve the condition of the coke oven heads. In recent years, environmental regulations have made it difficult to achieve the target for reducing non-methane hydrocarbon (NMTH) emissions from coke oven exhaust. Long-term, repeated testing has revealed that the reason coke oven chimney NMTH emissions fall short of standards is largely due to incomplete combustion products from the coke oven gas entering the exhaust system during supplemental heating at the burner head. Failure to use supplemental heating at the burner head lowers the burner head temperature, leading to worsening coke oven conditions and the influx of raw gas into the exhaust, producing NMTHs, a vicious cycle. Utility Model Content
[0003] The purpose of the utility model is to provide an adjustable burner supplementary heating device, which accurately adjusts the gas pressure in the newly added horizontal pipe for supplementary heating by utilizing the bypass pipe regulating valve of the coke oven gas supply pipeline and the regulating orifice box of the supplementary heating riser, and then slightly adjusts the amount of coke oven gas entering each burner by the supplementary heating small branch pipe valve; on the one hand, the exchange cock can make the gas enter the corresponding combustion chamber burner fire channel as the exchange occurs, preventing the supplementary supply gas from entering the descending airflow, thereby ensuring the effective utilization of the supplementary heating gas; on the other hand, through precise control, the gas usage is reduced, the gas-air ratio is guaranteed, and the production of non-methane substances due to incomplete combustion of coke oven gas is greatly reduced, thereby solving the above-mentioned problems existing in the background technology.
[0004] The technical solution of the utility model is: an adjustable furnace head supplementary heating device, comprising a coke oven gas supply pipeline bypass pipe, a supplementary heating riser, a supplementary heating horizontal pipe, a supplementary heating newly added horizontal pipe, a supplementary heating small branch pipe, a supplementary heating addition and subtraction cock, a supplementary heating riser regulating orifice box, a supplementary heating exchange cock, a supplementary heating small branch pipe valve, a coke oven gas supply pipeline bypass pipe shut-off valve and a coke oven gas supply pipeline bypass pipe regulating valve, wherein the coke oven gas supply pipeline bypass pipe is installed at the coke oven gas supply pipeline manual regulating valve of the coke oven gas supply pipeline; the supplementary heating riser is connected to the basement part of the coke oven gas supply pipeline, the supplementary heating horizontal pipe is vertically connected to the top of the supplementary heating riser, the supplementary heating newly added horizontal pipe is sectionally laid on the coke machine side, one end of the supplementary heating newly added horizontal pipe is connected to the supplementary heating horizontal pipe, and the other end is connected to the furnace head fire channel lower nozzle through the supplementary heating small branch pipe;
[0005] The shut-off valve and regulating valve of the bypass pipe of the coke oven gas supply pipeline are arranged on the bypass pipe of the coke oven gas supply pipeline. The bypass pipe at one end of the shut-off valve of the bypass pipe of the coke oven gas supply pipeline is connected to the pipeline before the manual regulating valve of the coke oven gas supply pipeline. The pipeline at one end of the regulating valve of the bypass pipe of the coke oven gas supply pipeline is connected to the pipeline after the manual regulating valve of the coke oven gas supply pipeline.
[0006] The supplementary heating plus / minus cock, the supplementary heating riser regulating orifice box and the supplementary heating exchange cock are installed on the supplementary heating riser. The supplementary heating plus / minus cock and the pipe nipple of the supplementary heating riser are connected to the supplementary heating riser regulating orifice box and then connected to the supplementary heating exchange cock.
[0007] The supplementary heating small branch pipe valves are installed on the supplementary heating small branch pipes, and the number of the supplementary heating small branch pipe valves matches the number of the supplementary heating small branch pipes.
[0008] The coke oven gas supply pipeline bypass pipe is also provided with a field pressure gauge behind the coke oven gas supply pipeline bypass regulating valve, and the field pressure gauge opening behind the coke oven gas supply pipeline bypass regulating valve is installed behind the coke oven gas supply pipeline bypass pipe regulating valve.
[0009] It also includes a supplementary heating riser reinforcement plate, which is installed at the root of the connection position between the supplementary heating riser and the coke oven gas supply pipeline. The supplementary heating horizontal pipe is provided with a bracket, and the supplementary heating riser reinforcement plate and the supplementary heating horizontal pipe bracket are matched and used together.
[0010] The supplementary heating small branch pipe is connected to the lower nozzle of the burner fire channel through the burner supplementary heating branch pipe soft connecting pipe, and is fastened and sealed by a clamp.
[0011] A blind plate is provided between the lower nozzles of each row of burner head fire channels and the original horizontal pipes.
[0012] The coke oven gas supply pipeline bypass pipe is a C-shaped structure.
[0013] The beneficial effects of the present invention are as follows: the gas pressure in the newly added horizontal pipe for supplementary heating is accurately adjusted by utilizing the bypass pipe regulating valve of the coke oven gas supply pipeline and the regulating orifice box of the supplementary heating riser, and the amount of coke oven gas entering each burner is slightly adjusted by the valve of the supplementary heating small branch pipe; on the one hand, the exchange cock can make the gas enter the corresponding combustion chamber burner fire channel as the exchange occurs, preventing the supplementary supply gas from entering the descending airflow, thereby ensuring the effective utilization of the supplementary heating gas; on the other hand, through precise control, the gas usage is reduced, the gas-air ratio is guaranteed, and the production of non-methane substances due to incomplete combustion of coke oven gas is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0015] Figure 2 For this utility model Figure 1 Schematic diagram of the connection between the supplementary heating branch pipe at A and the lower nozzle of the burner flame channel;
[0016] Figure 3 This is a schematic diagram of the main pipeline plan layout of the utility model;
[0017] Figure 4 It is a longitudinal cross-sectional schematic diagram of the utility model;
[0018] In the figure: coke oven gas supply pipeline 1, supplementary heating riser reinforcement plate 2, supplementary heating addition and subtraction cock 3, supplementary heating riser adjustment orifice box 4, supplementary heating exchange cock 5, supplementary heating riser 6, supplementary heating horizontal pipe 7, supplementary heating newly added horizontal pipe 8, supplementary heating small branch pipe 9, burner head fire channel downspout 10, burner head supplementary heating branch pipe flexible connecting pipe 11, supplementary heating small branch pipe valve 12, coke oven gas supply pipeline manual regulating valve 13, coke oven gas supply pipeline bypass pipe shut-off valve 14, coke oven gas supply pipeline bypass pipe regulating valve 15, coke oven gas supply pipeline bypass pipe on-site pressure gauge behind the bypass regulating valve 16, coke oven gas supply pipeline bypass pipe 17, basement 18, machine side 19, coke side 20. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solutions and advantages of the implementation cases of the present utility model clearer, the technical solutions in the implementation cases of the present utility model will be clearly and completely described below in combination with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present utility model, rather than all the implementation cases. Based on the implementation cases in the present utility model, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present utility model.
[0020] An adjustable burner head supplementary heating device comprises a coke oven gas supply pipeline bypass pipe 17, a supplementary heating riser 6, a supplementary heating horizontal pipe 7, a supplementary heating newly added horizontal pipe 8, a supplementary heating small branch pipe 9, a supplementary heating addition and subtraction cock 3, a supplementary heating riser regulating orifice box 4, a supplementary heating exchange cock 5, a supplementary heating small branch pipe valve 12, a coke oven gas supply pipeline bypass pipe shut-off valve 14 and a coke oven gas supply pipeline bypass pipe regulating valve 15, wherein the coke oven gas supply pipeline bypass pipe 17 is installed at the coke oven gas supply pipeline manual regulating valve 13 of the coke oven gas supply pipeline 1; the supplementary heating riser 6 is connected to the basement portion of the coke oven gas supply pipeline 1, the supplementary heating horizontal pipe 7 is vertically connected to the top of the supplementary heating riser 6, the supplementary heating newly added horizontal pipe 8 is laid in sections on the coke machine side, one end of the supplementary heating newly added horizontal pipe 8 is connected to the supplementary heating horizontal pipe 7, and the other end is connected to the burner head fire channel downspout 10 through the supplementary heating small branch pipe 9;
[0021] The shutoff valve 14 and the regulating valve 15 of the bypass pipe of the coke oven gas supply pipeline are arranged on the bypass pipe 17 of the coke oven gas supply pipeline. The bypass pipe at one end of the shutoff valve 14 of the coke oven gas supply pipeline is connected to the pipeline before the manual regulating valve 13 of the coke oven gas supply pipeline. The bypass pipe regulating valve 15 at one end of the coke oven gas supply pipeline is connected to the pipeline after the manual regulating valve 13 of the coke oven gas supply pipeline.
[0022] The supplementary heating plus / minus cock 3, the supplementary heating riser regulating orifice box 4, and the supplementary heating exchange cock 5 are installed on the supplementary heating riser 6. The pipe nipples of the supplementary heating plus / minus cock 3 and the supplementary heating riser 6 are connected to the supplementary heating riser regulating orifice box 4, and then connected to the supplementary heating exchange cock 5.
[0023] The supplementary heating small branch pipe valves 12 are installed on the supplementary heating small branch pipes 9 , and the number of the supplementary heating small branch pipe valves 12 matches the number of the supplementary heating small branch pipes 9 .
[0024] The coke oven gas supply pipeline bypass pipe 17 is also provided with a coke oven gas supply pipeline bypass regulating valve rear site pressure gauge 16, and the coke oven gas supply pipeline bypass regulating valve rear site pressure gauge 16 opening is installed behind the coke oven gas supply pipeline bypass pipe regulating valve 15.
[0025] It also includes a supplementary heating riser reinforcement plate 2, which is installed at the root of the connection position between the supplementary heating riser 6 and the coke oven gas supply pipe 1. The supplementary heating cross pipe 7 is provided with a bracket, and the supplementary heating riser reinforcement plate 2 and the bracket of the supplementary heating cross pipe 7 are matched and used together.
[0026] The supplementary heating branch pipe 9 is connected to the burner head fire channel lower nozzle 10 through the burner head supplementary heating branch pipe soft connecting pipe 11 and is fastened and sealed by a clamp.
[0027] A blind plate is provided between the lower nozzles 10 of each row of burner head fire channels and the original horizontal pipes.
[0028] The coke oven gas supply pipeline bypass pipe 17 is a C-shaped structure.
[0029] In practice, a smaller-diameter bypass pipe 17 is installed on the existing coke oven gas supply pipeline 1. A bypass shutoff valve 14 is installed above the pipe to facilitate switching and maintenance. A bypass regulating valve 15 and a pressure gauge 16 are installed behind the bypass regulating valve 14 to facilitate on-site adjustment and monitoring of the basement furnace supplementary heating system pressure.
[0030] In the basement part, a supplementary heating riser 6, a supplementary heating addition and subtraction cock 3, a supplementary heating riser regulating orifice box 4 and a supplementary heating exchange cock 5 are installed on the coke oven gas supply pipeline 1, and a new supplementary heating horizontal pipe 8 is laid in sections for supplementary heating on the coke machine side. The supplementary heating small branch pipe 9 on the new supplementary heating horizontal pipe 8 is used to provide gas source for supplementary heating of the furnace head.
[0031] The burner head supplementary heating risers 6 are divided into columns A and B. Columns A and B form a group. Column A supplies coke oven gas for supplementary heating of even-numbered burners, while column B supplies coke oven gas for odd-numbered burners. Column A corresponds to double-row ascending exchange, while column B corresponds to single-row ascending exchange.
[0032] After the gas is drawn out from the coke oven gas main to the supplementary heating riser 6 in row A, it passes through the supplementary heating riser regulating orifice box 4 and the supplementary heating exchange cock 5, and enters the newly installed supplementary heating horizontal pipe 7. The supplementary heating horizontal pipe 7 is then transported to the locations near the 1st and 34th holes in the coke oven basement (such as Figure 1 ) is fed from the additional supplementary heating horizontal pipe 8 on the additional supplementary heating small branch pipe 9 through the supplementary heating small branch pipe valve 12 and the burner head supplementary heating branch pipe flexible connecting pipe 11 into the double-row burner head flue lower nozzle 10. The B column is led out in the same manner and fed into the single-row burner head flue lower nozzle 10.
[0033] The supplementary heating exchange cocks 5 of columns A and B in each section of the burner supplementary heating must be consistent with the double-row and single-row exchange of coke oven gas. Blind plates must be used to block the lower nozzles 10 of each row of burner fire channels and the coke oven gas heating transverse pipes to prevent the supplementary gas from flowing back into the coke oven gas heating transverse pipes, thereby ensuring accurate regulation of the gas intake. Example
[0034] During the initial construction phase of the supplementary heating process, prefabricate the supplementary heating horizontal pipe 7, the supplementary heating branch pipe 9 and valve 12 on the newly added supplementary heating horizontal pipe 8, the lower half of the supplementary heating riser pipe 6, and the pipe nipples for the supplementary heating exchange cock 5 and the supplementary heating riser pipe 6. For the bypass modification of the coke oven gas supply pipeline on the second-floor platform, prefabricate the C-shaped pipe assembly for the coke oven gas supply pipeline bypass pipe 17. Once this is complete, shut down the coke oven gas supply, switch to blast furnace gas heating, and replace the coke oven gas supply pipeline. After sampling passes the test, the installation of the coke oven gas supply pipeline bypass pipe 17 on the second-floor platform and the drilling of the basement coke oven gas supply pipeline 1 can be carried out simultaneously. After the installation of the coke oven gas supply pipeline bypass pipe 17 and the supplementary heating exchange cock 3 on the second-floor platform is complete, gas can be restored. A blind plate should be installed at the flange behind the supplementary heating exchange cock 3. Construction typically takes 6-8 hours. Next, install the supplementary heating riser regulating orifice box 4 and the supplementary heating exchange cock 5 to connect the supplementary heating cross pipe 7 arranged on the upper part. After the supplementary heating exchange cock 5 is connected and tightened with the brace, remove the blind plate for replacement air supply.
[0035] In this embodiment, the installation and connection of the supplementary heating horizontal pipe 7 do not require repeated shutdown of the coke oven gas supply, reducing construction difficulty and shortening gas outage time. Considering insufficient pipe strength, supplementary heating vertical pipe reinforcement plates 2, support pipes, or support brackets can be installed on both sides of the base of the supplementary heating vertical pipe 6 to ensure that the connecting pipe is not deformed by poor lubrication during replacement, thereby affecting its use.
[0036] When using non-methane total hydrocarbons (NMHCs) as the control standard: When chimney online NMHC levels increase, observe whether the coke oven gas pressure fluctuates synchronously. If the NMHC concentration rises and falls roughly in sync with the coke oven gas pressure fluctuations, close the bypass regulating valve 15 on the coke oven gas supply pipeline on the second-floor platform. When the NMHC reading stabilizes at around 40 mg / m³, the gas supply for the burner head supplemental heating is generally sufficient. Tests should be conducted based on the supplemental heating plus / minus cock 3 opening under current operating conditions. Install the corresponding orifice plate in the supplemental heating riser regulating orifice box 4. Then, adjust the opening of the supplemental heating branch valve 12 on each individual fire channel according to the firing status of the fire channel until the burner head temperature and NMHC levels reach the desired level.
[0037] When the furnace head temperature is used as the adjustment standard, the furnace head temperature needs to be measured before replacing the orifice plate of the supplementary heating riser adjustment orifice box 4, and the orifice plate size needs to be adjusted and selected. The furnace head temperature should be measured after 2-3 cycles, and the fire channel with abnormal furnace head temperature should be processed, or the supplementary heating small branch valve 12 should be adjusted until a satisfactory temperature is reached.
[0038] It's important to note that after adjustment, you need to observe the burner's ignition status and measure the α value to determine whether the amount of gas entering the burner is excessive. Because the supplementary heating of the burner generally uses rich gas, which consumes more oxygen than blast furnace gas (lean gas), it is recommended that the gas volume be adjusted from smallest to largest. This is the only way to achieve the optimal air-to-coal ratio for supplementary heating of the coke oven gas burner.
[0039] An embodiment of the present invention is as follows:
[0040] Coke oven gas supply pipeline 1 diameter 600mm
[0041] Supplementary heating horizontal pipe 7 1300mm long 100mm diameter
[0042] Supplementary heating: 8 new horizontal pipes, 2000mm long and 100mm in diameter
[0043] Supplementary heating small branch pipe 9 200mm long 20mm diameter
[0044] Supplementary heating small branch valve 12 Model JS-DN20
[0045] Furnace head supplementary heating branch flexible connecting pipe 11 300mm long 40mm outer diameter
[0046] Supplementary heating riser regulating orifice box 4 DN100 orifice plate 65mm.
Claims
1. An adjustable burner supplementary heating device, characterized in that: The invention comprises a coke oven gas supply pipeline bypass pipe (17), a supplementary heating riser (6), a supplementary heating transverse pipe (7), a supplementary heating newly added transverse pipe (8), a supplementary heating small branch pipe (9), a supplementary heating addition and subtraction cock (3), a supplementary heating riser regulating orifice box (4), a supplementary heating exchange cock (5), a supplementary heating small branch pipe valve (12), a coke oven gas supply pipeline bypass pipe shut-off valve (14) and a coke oven gas supply pipeline bypass pipe regulating valve (15), wherein the coke oven gas supply pipeline bypass pipe (17) is provided with a plurality of auxiliary pipes, wherein the auxiliary pipes are ... 7) Installed at the coke oven gas supply pipeline manual regulating valve (13) of the coke oven gas supply pipeline (1); the supplementary heating riser (6) is connected to the basement part of the coke oven gas supply pipeline (1), the supplementary heating horizontal pipe (7) is vertically connected to the top of the supplementary heating riser (6), and the supplementary heating newly added horizontal pipe (8) is laid in sections on the coke machine side, one end of the supplementary heating newly added horizontal pipe (8) is connected to the supplementary heating horizontal pipe (7), and the other end is connected to the burner head fire channel lower nozzle (10) through the supplementary heating small branch pipe (9); The coke oven gas supply pipeline bypass pipe shutoff valve (14) and the coke oven gas supply pipeline bypass pipe regulating valve (15) are arranged on the coke oven gas supply pipeline bypass pipe (17), one end of the coke oven gas supply pipeline bypass pipe shutoff valve (14) is connected to the front pipe of the coke oven gas supply pipeline manual regulating valve (13), and one end of the coke oven gas supply pipeline bypass pipe regulating valve (15) is connected to the rear pipe of the coke oven gas supply pipeline manual regulating valve (13); The supplementary heating plus / minus cock (3), the supplementary heating riser regulating orifice box (4) and the supplementary heating exchange cock (5) are installed at the supplementary heating riser (6), and the pipe short sections of the supplementary heating plus / minus cock (3) and the supplementary heating riser (6) are connected to the supplementary heating riser regulating orifice box (4), and then connected to the supplementary heating exchange cock (5); The supplementary heating small branch pipe valves (12) are installed on the supplementary heating small branch pipes (9), and the number of the supplementary heating small branch pipe valves (12) matches the number of the supplementary heating small branch pipes (9).
2. The adjustable burner supplementary heating device according to claim 1, characterized in that: The coke oven gas supply pipeline bypass pipe (17) is further provided with a coke oven gas supply pipeline bypass regulating valve rear-site pressure gauge (16), and the coke oven gas supply pipeline bypass regulating valve rear-site pressure gauge (16) has an opening installed behind the coke oven gas supply pipeline bypass pipe regulating valve (15).
3. The adjustable burner supplementary heating device according to claim 1, characterized in that: It also includes a supplementary heating riser reinforcement plate (2), which is installed at the root of the connection position between the supplementary heating riser (6) and the coke oven gas supply pipeline (1). The supplementary heating transverse pipe (7) is provided with a bracket, and the supplementary heating riser reinforcement plate (2) and the bracket of the supplementary heating transverse pipe (7) are matched and used.
4. The adjustable burner supplementary heating device according to claim 1, characterized in that: The supplementary heating small branch pipe (9) is connected to the burner head fire channel lower nozzle (10) via the burner head supplementary heating branch pipe soft connecting pipe (11), and is fastened and sealed by a clamp.
5. The adjustable burner supplementary heating device according to claim 1, characterized in that: A blind plate is provided between the lower nozzle (10) of each row of burner head fire channels and the original horizontal pipe.