Fuel gas conveying and purifying device for iron alloy tail gas engine

Abstract

The utility model discloses a fuel gas conveying and purifying device for an iron alloy tail gas engine. The fuel gas conveying and purifying device comprises a plurality of tail gas pipelines connected with a negative pressure mixer. A static mixer, a primary booster fan, a dust catching device, an air cooling device, a water washing tower and a cyclone gravity dehydration device are sequentially arranged on the pipeline between the negative pressure mixer and the gas storage cabinet; the tail end of an output pipe of the gas storage cabinet is connected with an engine; a first carbon monoxide sensor and a second electric valve are arranged on the tail gas pipeline; the tail gas pipeline between the first carbon monoxide sensor and the second electric valve is communicated with a torch branch pipe; the torch branch pipe is provided with a first electric valve, and the tail end of the torch branch pipe is connected with a torch device. The high-quality ferroalloy furnace tail gas is selected to enter the purification system, the burden of the whole purification system is reduced, multiple functions are achieved at the same time, and the fuel gas supply quality of an engine is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas purification treatment, and relates to the technical field of gas engines. Specifically, it is a gas transmission and purification device for ferroalloy tail gas engines. Background Technique

[0002] During the production process of ferroalloy production enterprises, a large amount of electric power resources are required. In recent years, ferroalloy tail gas has been widely used as engine fuel. The engine drives the generator to generate electricity for the enterprise's production electricity, which not only reduces the enterprise's pollutant emissions, but also can reuse the waste gas to convert it into electric energy. The main components of ferroalloy tail gas are CO, CO 2 , N 2 , H 2 . Among them, the main component that can be burned by the engine is CO. However, due to a large amount of dust particles, a large change range of components, and a large change in gas temperature in ferroalloy tail gas, it cannot be directly used for engine combustion. It needs to be purified to meet the requirements of the engine for fuel quality before it can be used by the engine. In the process of engineering application, multiple ferroalloy furnaces operate in parallel. Affected by factors such as raw material quality, furnace control, and operating status, the calorific value and pressure of the tail gas will inevitably change. Moreover, due to the poor dust removal, filtration, and temperature regulation effects of the existing purification system, the operating effect and duration of the gas engine are affected. The maintenance cycle of the engine is shortened, and the operation and maintenance cost is increased. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a gas transmission and purification device for ferroalloy tail gas engines. The purpose is that the gas transmission and purification system needs to have multiple functions such as mixing, boosting, stabilizing pressure, regulating temperature, water washing, dust removal, filtration, dehydration, flame retardance, and unloading; and be able to provide high-quality and stable gas supply for the engine.

[0004] To achieve the above object, the utility model provides the following technical solutions: A gas transmission and purification device for a ferroalloy tail gas engine, including multiple tail gas pipes connected to a negative pressure mixer; each of the tail gas pipes corresponds to a ferroalloy furnace and is used to collect the tail gas discharged from the ferroalloy furnace; on the pipe between the negative pressure mixer and the gas storage tank, a static mixer, a primary booster fan, a dust capture device, an air-cooling device, a water scrubber, and a cyclone gravity dehydration device are sequentially arranged; the end of the output pipe of the gas storage tank is connected to the engine to provide fuel for the engine; a first carbon monoxide sensor and a second electric valve are provided on the tail gas pipe; a torch branch pipe is communicated with the tail gas pipe between the first carbon monoxide sensor and the second electric valve; a first electric valve is provided on the torch branch pipe, and its end is connected to a torch device; the first carbon monoxide sensor, the first electric valve, and the second electric valve are all electrically connected to a control system to control the opening and closing of the first electric valve and the second electric valve according to the carbon monoxide concentration value obtained by the first carbon monoxide sensor; it also includes a sump, the sump is communicated with a sump pipe and a blow-off pipe, and a positive pressure water drainer is provided on the sump pipe near the sump; the drain pipes of the water scrubber and the gas storage tank are both communicated with the sump pipe.

[0005] As a further optimization, an anti-backflow device is provided on the tail gas pipe between the second electric valve and the negative pressure mixer.

[0006] As a further optimization, the output pipe is connected with multiple output branch pipes, and the end of each output branch pipe is connected to one of the engines.

[0007] As a further optimization, on the output pipe between the gas storage tank and the output branch pipe, a secondary booster fan, a heat exchange device, and a primary filtration device are sequentially arranged; an overpressure relief valve is provided at the end of the output pipe.

[0008] As a further optimization, the filtration device includes two filtration components, each of the filtration components includes a series-connected primary filter and a primary flame arrester; the two filtration components are connected in parallel to the output pipe; a manual butterfly valve is provided at the input end of the primary filter of each filtration component.

[0009] As a further optimization, the ends of the drain pipes of the primary filter and the heat exchange device are connected to the sump pipe.

[0010] As a further optimization, on the output branch pipe between the output pipe and the engine, a blind plate valve, a secondary filter, a tertiary filter, a secondary flame arrester, an electromagnetic quick cut-off valve, an electric control valve, and an overpressure relief valve are sequentially arranged.

[0011] As a further optimization, the drain pipes of the secondary filter and the tertiary filter are communicated with the sump pipe.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] (1) Through the dust removal and purification of multiple devices such as the dust removal device, water washing tower, gas holder, primary filter, secondary filter, and tertiary filter, the cleaning of solid particles in the tail gas is completed. It not only meets the requirements of the gas engine for gas particles but also can reduce the maintenance cycle of the system, and the downtime of the gas engine will also be correspondingly shortened, achieving the purpose of maximizing power generation benefits.

[0014] (2) Through the air-cooling cooling device, water washing tower, gas holder, and heat exchange device, the temperature of the tail gas is adjusted to make the gas temperature meet the requirements of the engine; through the primary booster fan, secondary booster fan, gas holder, and overpressure relief valve, the conveying pressure of the tail gas is adjusted to make the gas pressure meet the requirements of the engine.

[0015] (3) Through the cyclone gravity dehydration device, gas holder, gas heat exchanger, primary filter, secondary filter, and tertiary filter, the removal of liquid and gaseous water in the tail gas is completed, realizing the adjustment of the water content in the tail gas. The water content of the gas meets the requirements of the engine.

[0016] (4) Through the electric valve, combustion torch, anti-backflow device, negative pressure mixing device, and static mixer, the screening and mixing of the tail gas from multiple submerged arc furnaces are completed, making the tail gas from different submerged arc furnaces mix evenly and the carbon monoxide concentration in the gas meet the requirements of the engine.

[0017] (5) Through the installed overpressure relief valve, blow-off pipeline, torch, anti-backflow device, primary flame arrester, secondary flame arrester, and emergency cut-off valve, the safety of the conveying system is ensured.

[0018] In summary, the present utility model selects high-quality ferroalloy furnace tail gas to enter the purification system, reducing the burden on the entire purification system. At the same time, the gas purification system has multiple functions such as mixing, boosting, voltage stabilization, temperature adjustment, water washing, dust removal, filtration, dehydration, fire prevention, and relief, improving the quality of the engine gas supply. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model.

[0020] In the figure: 1. First carbon monoxide sensor; 2. First electric valve; 3. Torch; 4. Second electric valve; 5. Backflow prevention device; 6. Negative pressure mixer; 7. Static mixer; 8. Second carbon monoxide sensor; 9. Pressure sensor; 10. Third electric valve; 11. Primary booster fan; 12. Dust capture device; 13. Air-cooled cooling device; 14. Water scrubber; 15. Cyclone gravity dehydration device; 16. Gas storage tank; 17. Bleed-off pipe; 18. Positive pressure drainer; 19. Sewage collection tank; 20. Cooling water tower; 21. Water pool; 22. Water pump; 23. Secondary booster fan; 24. Heat exchange device; 25. Second pressure sensor; 26. Pressure gauge; 27. Manual butterfly valve; 28. Primary filter; 29. Primary flame arrester; 30. Overpressure relief valve; 31. Chiller; 32. Blind flange valve; 33. Secondary filter; 34. Tertiary filter; 35. Secondary flame arrester; 36. Electromagnetic quick cut-off valve; 37. Electric control valve; 38. Nitrogen generator. Detailed implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0022] Please refer to Figure 1 , the present invention provides a technical solution: a gas transmission and purification device for a ferroalloy tail gas engine, a gas transmission and purification device for a ferroalloy tail gas engine, including a mixing system, a primary boosting system, a bag dust removal device, an air-cooled cooling device 13, a water scrubber 14, a cyclone gravity dehydration device 15, a gas storage tank 16, a secondary boosting system, a primary filter 28, a primary flame arrester 29, gas branch pipeline equipment, and a sewage collection system.

[0023] The mixing system consists of a carbon monoxide sensor, an electric valve, a combustion torch 3, a backflow prevention device 5, a negative pressure mixer 6, and a static mixer 7.

[0024] Multiple carbon monoxide sensors are set. The first carbon monoxide sensor 1 is used to detect the concentration of carbon monoxide in the tail gas at the outlet of the ore furnace, and the second carbon monoxide sensor 8 is used to detect the concentration of carbon monoxide in the tail gas after static mixing.

[0025] Before the tail gas from different submerged arc furnaces of ferroalloys enters the system, the carbon monoxide content in the gas needs to be detected by the first carbon monoxide sensor 1 at the front end to control the opening and closing of the first electric valve 2, control the opening and closing of the ignition system of the torch 3, and control the closing and opening of the second electric valve 4. The purpose is that when the operation in the submerged arc furnace is abnormal, the carbon monoxide content will be too low. When the carbon monoxide content is too low, the tail gas enters the torch 3 through the first electric valve 2 and burns, preventing the tail gas of too low quality from entering the conveying and purification system. The tail gas passing through the second electric valve 4 enters the anti-counterflow device 5 and then enters the negative pressure mixing device 6 to be preliminarily mixed with the tail gas from other submerged arc furnaces. To ensure that the tail gases from different submerged arc furnaces can be mixed evenly, a static mixer 7 is set after the negative pressure mixing device 6. A second carbon monoxide sensor 8 is set after the static mixer 7 to detect the carbon monoxide content in the mixed gas. The opening degree of different second electric valves 4 is controlled by this content value to ensure that the carbon monoxide content entering the purification system is the value required by the engine. A protection device is provided to prevent the anti-counterflow device 5 from effectively ensuring the mutual influence after the pressure fluctuations of the tail gases from different submerged arc furnaces.

[0026] After the mixing system is a primary pressurization system. The function of the primary pressurization system is to pressurize the tail gas passing through the mixing device to overcome the resistance of the equipment in the system, including a primary pressurization fan 11, the electric valves before and after the fan, and a control system. At least two primary pressurization fans 11 in parallel are set as backups for each other to pressurize and overcome the resistance of the equipment in the system. Preferably, the rotational speed and flow rate of the primary pressurization fan 11 are adjustable and controllable.

[0027] The primary pressurization fan 11 uses a special gas fan for gas, and the configuration type is two in parallel. The two fans are backups for each other. The control of the fan uses a frequency converter to control and adjusts the rotational speed of the fan according to the outlet pressure. At the same time, the control system also needs to configure the alarm protection logic for the overpressure and low pressure of the fan and the alarm protection logic for the too low inlet pressure of the fan. Three pressure sensors 9 at the inlet and outlet of the fan are configured, and the signals received by the control system adopt a two-out-of-three logic, which can effectively ensure the reliability of the system.

[0028] Particularly, a dust capture device 12 is set after the primary pressurization system; preferably, the dust capture device 12 uses a multi-stage cloth pocket type to make a bag dust removal device; the main function of the dust capture device 12 is to remove fine and dry dust and ensure the cleanliness of the gas of the subsequent equipment entering the purification system. The dust capture device 12 should have the function of back blowing. When the resistance of the equipment is too large, the dust capture device 12 can be back blown to remove the intercepted dust.

[0029] After the dust capture device 12, there are successively an air-cooling and temperature-lowering device 13, a water scrubber 14, and a cyclone gravity dehydration device 15. The air-cooling and temperature-lowering device 13 preliminarily cools the tail gas that has been heated and pressurized after passing through the primary pressurization system by using the principle of natural heat dissipation. The water scrubber 14 performs secondary forced cooling on the tail gas and simultaneously washes and removes impurities such as particulate matter, tar, and ammonia in the tail gas that are unfavorable to the operation of the engine. The water washing system used in the water scrubber 14 is a closed-loop system. The water pump 22 pressurizes the water from the water tank 21 and atomizes the water through the internal nozzles of the water scrubber 14. The water that has flowed back returns to the water tank 21 by gravity flow. Since the water temperature will rise significantly due to heat exchange with the tail gas, a cooling water tower 20 is installed above the water tank 21 to reduce the water temperature. The tail gas after water washing will carry away some liquid water, and a cyclone gravity dehydration device 15 is installed behind the water scrubber 14 to remove the liquid water and large particulate matter contained in the gas.

[0030] The tail gas passing through the cyclone gravity dehydration device 15 is transported to the gas storage tank 16 for storage. The gas storage tank has a floating roof structure, and a gas remixing device should be provided inside the gas storage tank 16 to prevent gas stratification. At the same time, the gas storage tank can play a better role in stabilizing the pressure, removing dust, and dehydrating the tail gas.

[0031] Behind the gas storage tank 16 is a secondary pressurization system. The function of the secondary pressurization system is to pressurize the tail gas in the gas storage tank 16 to overcome the resistance of the equipment in the system, including a secondary pressurization fan 23, electric valves before and after the fan, and a control system. The secondary pressurization fan 23 uses a special fan for gas, and the configuration type is a parallel connection of two units. The two fans are backup for each other. The control of the fan uses a frequency converter to control the speed of the fan according to the outlet pressure. At the same time, the control system also needs to be configured with alarm protection logics for overpressure and low pressure at the fan outlet and alarm protection logic for too low pressure at the fan inlet. Three pressure sensors 9 are configured at the inlet and outlet of the fan. The signals received by the control system adopt a two-out-of-three logic, which can effectively ensure the reliability of the system.

[0032] Behind the secondary pressurization system is a heat exchange device 24 for gas to control the temperature of the tail gas entering the engine. Two systems, namely a cold water system and a hot water system, are equipped for the heat exchange device 24 for gas. The two systems are switched by setting valves at the water inlets of the heat exchanger. The cold water system is equipped with a chiller 31 to reduce the temperature of the tail gas, and the hot water system uses the high-temperature water of the engine to increase the temperature of the tail gas.

[0033] After the tail gas passes through the heat exchange device 24, it passes through the primary filter 28 and the primary flame arrester 29 and then enters the branch pipeline of the unit. To ensure the long-term operation of the engine, the primary filter 28 and the primary flame arrester 29 are redundantly configured. Manual valves, pressure gauges 26 and pressure sensors 9 are installed in front of the primary filter 28 and behind the primary flame arrester 29. The pressure drop is used to determine whether the primary filter 28 and the primary flame arrester 29 need maintenance. During maintenance, the two sets of equipment are switched by opening or closing the valves.

[0034] The tail gas passing through the primary filter 28 and the primary flame arrester 29 enters the gas branch pipeline system of each engine. The gas branch pipeline system includes a blind plate valve 32, a secondary filter 33, a tertiary filter 34, a secondary flame arrester 35, an electromagnetic quick cut-off valve 36, and an electric control valve 37. The tail gas is filtered multiple times again on the branch pipeline. The electromagnetic quick cut-off valve 36 and the electric control valve 37 are controlled by the engine control system to realize the start-up gas supply and shutdown gas cut-off of the unit.

[0035] Drain pipes are led out from the lowest points of all equipment with dehydration functions. The drain pipes are buried underground. All drain pipes are aggregated into a sewage collection pipe, and then pass through a positive pressure drainer 18 to a sewage collection tank 19. The positive pressure drainer 18 is used to prevent the tail gas from being discharged into the sewage collection tank 19. A relief pipe 17 is installed on the cover of the sewage collection tank for discharging the tail gas accumulated in the sewage collection tank 19. An overpressure relief valve 30, a primary flame arrester 29, and a secondary flame arrester 35 are installed on the tail gas pipeline for ensuring the safety of the conveying system. A nitrogen generator 38 is set in the system for air replacement in the system.

[0036] The advantages of this embodiment are as follows.

[0037] (1) Through the dust removal and purification of multiple devices such as the bag dust removal device, the water washing tower 14, the gas holder, the primary filter 28, the secondary filter 33, and the tertiary filter 34, the cleaning of solid particles in the tail gas is completed. It not only meets the requirements of the gas engine for gas particles but also can reduce the maintenance cycle of the system, and the shutdown time of the gas engine will also be correspondingly shortened, achieving the purpose of maximizing the power generation benefit.

[0038] (2) Through the air-cooling cooling device 13, the water washing tower 14, the gas holder, and the gas heat exchange device 24, the temperature of the tail gas is adjusted to make the gas temperature meet the requirements of the engine; through the primary booster fan 11, the secondary booster fan 23, the gas holder, and the overpressure relief valve 30, the conveying pressure of the tail gas is adjusted to make the gas pressure meet the requirements of the engine.

[0039] (3) Through the cyclone gravity dehydration device 15, gas holder, gas heat exchanger, primary filter 28, secondary filter 33, and tertiary filter 34, the removal of liquid and gaseous water in the tail gas is completed, and the water content in the tail gas is adjusted to meet the requirements of the engine for the water content of the gas.

[0040] (4) Through the electric valve, combustion torch 3, anti-backflow device 5, negative pressure mixer 6, and static mixer 7, the screening and mixing of the tail gases from multiple submerged arc furnaces are completed, so that the tail gases from different submerged arc furnaces are evenly mixed, and the carbon monoxide concentration in the gas meets the requirements of the engine.

[0041] (5) Through the installed overpressure relief valve 30, 17-way blow-off pipe, torch 3, anti-backflow device, primary flame arrester 29, secondary flame arrester 35, and emergency cut-off valve, the safety of the conveying system is ensured.

[0042] In summary, in this embodiment, high-quality ferroalloy furnace tail gas is selected to enter the purification system, reducing the burden on the entire purification system. At the same time, the gas purification system has multiple functions such as mixing, boosting, pressure stabilizing, temperature regulating, water washing, dust removal, filtering, dehydration, fire prevention, and relief, improving the quality of the gas supply to the engine.

[0043] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fuel gas transport and purification device for a ferroalloy exhaust gas engine, comprising a plurality of exhaust gas pipelines connected to a negative pressure mixer (6); each of the exhaust gas pipelines corresponds to a ferroalloy furnace and is used to collect the exhaust gas of the ferroalloy furnace; characterized in that: A static mixer (7), a primary booster fan (11), a dust capture device (12), an air cooling device (13), a water scrubber (14), and a cyclone gravity dehydration device (15) are sequentially arranged on the pipeline between the negative pressure blender (6) and the gas storage cabinet (16); the end of the output pipe of the gas storage cabinet (16) is connected to the engine; The tail gas pipeline is provided with a first carbon monoxide sensor (1) and a second electric valve (4); a flare branch pipe is connected to the tail gas pipeline between the first carbon monoxide sensor (1) and the second electric valve (4); the flare branch pipe is provided with a first electric valve (2), the end of which is connected to a flare device; the first carbon monoxide sensor (1), the first electric valve (2) and the second electric valve (4) are all electrically connected to a control system, and are used to control the opening and closing of the first electric valve (2) and the second electric valve (4) according to the carbon monoxide concentration value obtained by the first carbon monoxide sensor (1); It also includes a sewage collecting tank (19), the sewage collecting tank (19) is connected to a sewage collecting pipe and a discharge pipe (17), and a positive pressure water discharger (18) is provided on the sewage collecting pipe near the sewage collecting tank (19); the drainage pipes of the water washing tower (14) and the gas storage cabinet (16) are both connected to the sewage collecting pipe.

2. A fuel gas transport and purification device for a ferroalloy exhaust engine according to claim 1, characterized in that: A backflow prevention device (5) is provided on the exhaust gas pipeline between the second electric valve (4) and the negative pressure mixer (6).

3. The fuel gas transport and purification device for a ferroalloy exhaust engine according to claim 1, characterized in that: The output pipe is connected to a plurality of output branch pipes, and the end of each output branch pipe is connected to one of the engines.

4. A fuel gas transport and purification device for a ferroalloy exhaust engine according to claim 3, characterized in that: The output pipe between the gas storage cabinet (16) and the output branch pipe is provided with a secondary booster fan (23), a heat exchange device (24), and a primary filter device in sequence; an overpressure relief valve (30) is provided at the end of the output pipe.

5. A fuel gas transport and purification device for a ferroalloy exhaust engine according to claim 4, characterized in that: The primary filtering device comprises two filtering assemblies, each of which comprises a primary filter (28) and a primary flame arrester (29) connected in series; the two filtering assemblies are connected in parallel to the output pipe; and a manual butterfly valve (27) is provided at the input end of the primary filter (28) of each filtering assembly.

6. A fuel gas transport and purification device for a ferroalloy exhaust engine according to claim 5, characterized in that: The ends of the drainage pipes of the primary filter (28) and the heat exchange device (24) are connected to the sewage collecting pipe.

7. A fuel gas transport and purification device for a ferroalloy tail gas engine according to claim 6, characterized in that: The output branch pipe between the output pipe and the engine is provided with a blind plate valve (32), a secondary filter (33), a tertiary filter (34), a secondary flame arrester (35), an electromagnetic quick-break valve (36), an electric regulating valve (37) and an overpressure relief valve (30) in sequence.

8. A fuel gas transport and purification device for a ferroalloy exhaust engine according to claim 7, characterized in that: The drainage pipes of the secondary filter (33) and the tertiary filter (34) are both connected to the sewage collecting pipe.

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