A combined coal charging and coke discharging dust removal pre-spraying desulfurization system

Abstract

The utility model provides a kind of dusting pre-spraying desulfurization system of coal charging coke combined, including coke bag filter, coal charging bag filter, coke desulfurization pre-spraying device, coal charging desulfurization pre-spraying device, coke dust removal fan and coal charging dust removal fan etc., the flue gas import of coke bag filter is connected coke system, the powder outlet of coke desulfurization pre-spraying device is communicated coke dust removal pipeline, the coke desulfurization ash outlet of coke bag filter is connected the feed inlet of first bin on coal charging desulfurization pre-spraying device;Powder outlet of coal charging desulfurization pre-spraying device is communicated with coal charging dust removal pipeline by second material conveying pipe, and coal charging desulfurization ash of coal charging bag filter is transported to dust storage device;It further includes secondary coal charging desulfurization pre-spraying device, for secondary pre-spraying when sulfur dioxide concentration is over standard.The utility model can guarantee that the content of sulfur dioxide in coke and coal charging system reaches discharge standard, and can save the use amount of desulfurizer, improve equipment service life.

Description

Technical Field

[0001] This utility model relates to the field of coke oven dust removal technology, and in particular to a dust removal and pre-coating desulfurization system that combines coal charging and coke discharging. Background Technology

[0002] The coking process includes multiple stages such as coal preparation, coke oven heating, coal charging, coke pushing, and coke quenching, all of which generate dust emissions. Among these, the coal charging and coke pushing processes are the most serious dust pollution stages in coking production. Instantaneous peak pollution sources during coal charging and coke pushing can release pollutants as high as 20,000 mg / m³ in a short period. During the coal charging and coke discharging processes, large amounts of high-temperature, intermittent dust are generated at the charging holes and discharging points. The pollutant composition in the flue gas is extremely complex, containing not only carcinogens such as benzo[a]pyrene, but also odorous gases such as H2S and SO2, as well as VOCs pollutants such as polycyclic aromatic hydrocarbons. The harm these harmful substances pose to the environment and human health cannot be ignored.

[0003] Dust generated during coal charging and coke discharging is typically controlled to achieve ultra-low emissions using ground-based dust collection stations, which generally employ baghouse dust collectors for dust removal and purification. Given the tar-laden nature of coal charging dust, baghouse dust collectors require a pre-coating process before operation to form an inert dust layer on the filter bag surface. This effectively prevents the filter bags from clogging or corroding when filtering high-concentration oil fumes, corrosive gases, or particulate matter, significantly extending their service life. However, in actual coke oven production, dust collection systems often suffer from excessive sulfur dioxide emissions. Existing coal charging dust collection pre-coating systems lack desulfurization capabilities, making it difficult to meet national emission standards for sulfur dioxide. Furthermore, the collected flue gas contains a certain amount of tar, which adheres to the filter bags, causing ash agglomeration, increasing bag resistance, reducing airflow, and significantly diminishing dust collection efficiency and filter bag lifespan. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a combined dust removal and pre-spraying desulfurization system for coal loading and coking that has good desulfurization effect and allows for the combined utilization of desulfurization ash.

[0005] This utility model is achieved through the following technical solution: A combined coal charging and coke discharging dust removal, pre-coating, and desulfurization system includes a coke discharging baghouse dust collector, a coal charging baghouse dust collector, a coke discharging desulfurization pre-coating device, a coal charging desulfurization pre-coating device, a dust storage device, a coke discharging dust removal fan, a coal charging dust removal fan, a coke discharging dust removal chimney, and a coal charging dust removal chimney. The clean gas outlet of the coke discharging baghouse dust collector is sequentially connected to the coke discharging dust removal fan and the coke discharging dust removal chimney via a coke discharging clean gas pipeline. The flue gas inlet of the coke discharging baghouse dust collector is connected to the coke discharging system via a coke discharging dust removal pipeline. The powder outlet of the coke discharging desulfurization pre-coating device is connected via... The first conveying pipe is connected to the coke discharge dust removal pipe, which is used to spray the desulfurization pre-coating powder onto the surface of the dust collection bag in the coke discharge bag dust collector under the action of the coke discharge dust removal fan. The coke discharge desulfurization ash outlet of the coke discharge bag dust collector is connected to the coke discharge scraper ash conveyor. The coal charging desulfurization pre-coating device is equipped with a first silo for storing the desulfurization pre-coating powder. The coke discharge scraper ash conveyor is connected to the inlet of the first silo through the first ash conveying pipe, which is used to transport the coke discharge desulfurization ash from the coke discharge bag dust collector to the first silo of the coal charging desulfurization pre-coating device. The clean gas outlet of the coal-loading bag filter is connected in sequence to the coal-loading dust removal fan and the coal-loading dust removal chimney via a coal-loading clean gas pipeline. The flue gas inlet of the coal-loading bag filter is connected to the coal-loading system via a coal-loading dust removal pipeline. The powder outlet of the coal-loading desulfurization pre-coating device is connected to the coal-loading dust removal pipeline via a second conveying pipe, which is used to spray the desulfurization pre-coating powder in the first silo onto the surface of the dust collection bags in the coal-loading bag filter under the action of the coal-loading dust removal fan. The coal-loading desulfurization ash outlet of the coal-loading bag filter is connected to the coal-loading scraper ash conveyor. The coal-loading scraper ash conveyor is connected to the dust storage device via a second ash conveying pipeline, which is used to transport the coal-loading desulfurization ash from the coal-loading bag filter to the dust storage device.

[0006] Furthermore, it also includes a secondary coal loading desulfurization pre-coating device. The secondary coal loading desulfurization pre-coating device is equipped with a second silo for storing desulfurizing agent. The powder outlet of the secondary coal loading desulfurization pre-coating device is connected to the coal loading dust removal pipeline through a third conveying pipe. A sulfur dioxide concentration sensor is installed at the clean gas outlet of the coal loading bag dust collector to detect the sulfur dioxide concentration in the flue gas discharged from the coal loading bag dust collector. The secondary coal loading desulfurization pre-coating device is connected to the sulfur dioxide concentration sensor. When the sulfur dioxide concentration in the flue gas is detected to exceed the set value, the desulfurization pre-coating operation is started, so that the desulfurizing agent in the second silo is sprayed onto the surface of the dust collection bag in the coal loading bag dust collector under the action of the coal loading dust removal fan for secondary pre-coating.

[0007] Furthermore, the secondary coal loading desulfurization pre-spraying device also includes a first level gauge, a first ash discharge valve, and a first solenoid valve. The first level gauge is installed in the second silo and includes a first ultra-high level gauge, a first high level gauge, and a first low level gauge, which are used to detect the ultra-high level, high level, and low level of the second silo, respectively, so as to provide alarms for ultra-high level, high level, and low level. The first ash discharge valve is installed at the bottom of the second silo and is connected to a sulfur dioxide concentration sensor for linkage operation. The first ash discharge valve is connected to the coal loading dust removal pipeline through the third conveying pipe, which is also connected to the first compressed air pipeline. The first solenoid valve is installed on the first compressed air pipeline and is connected to the sulfur dioxide concentration sensor for linkage operation, controlling the introduction of compressed air to spray desulfurizing agent.

[0008] Furthermore, a coking high-temperature flue gas cooling and separation flame arrester is also installed at the flue gas inlet of the coking bag filter. The coking high-temperature flue gas cooling and separation flame arrester is located at the rear end of the coking desulfurization pre-coating device and is used for cooling, flame arresting and separation of flue gas before dust removal. The coking high-temperature flue gas cooling and separation flame arrester includes a first flue gas inlet, a first flue gas outlet and a first dust outlet. The first flue gas inlet is connected to the coking dust removal pipeline, the first flue gas outlet is connected to the flue gas inlet of the coking bag filter, and the first dust outlet is located at the bottom of the coking high-temperature flue gas cooling and separation flame arrester. The first dust outlet is connected to the first ash conveying pipeline. After cooling and separation, the flue gas enters the coking bag filter. The separated dust enters the first hopper of the coal charging desulfurization pre-coating device together with the dust separated by the coking bag filter.

[0009] Furthermore, a spark catcher is also installed at the flue gas inlet of the coal-loading bag filter, and the spark catcher is located at the rear end of the coal-loading desulfurization pre-coating device for spark capture and separation. The spark catcher includes a second flue gas inlet, a second flue gas outlet, and a second dust outlet. The second flue gas inlet is connected to the coal-loading dust collection pipeline, the second flue gas outlet is connected to the flue gas inlet of the coal-loading bag filter, and the second dust outlet is located at the bottom of the spark catcher and is connected to the second ash conveying pipeline. After cooling and separation, the flue gas enters the coal-loading bag filter, and the separated dust enters the dust storage device together with the dust separated by the coal-loading bag filter.

[0010] Furthermore, the coal loading desulfurization pre-coating device also includes a second level gauge, a second ash discharge valve, and a second solenoid valve. The second level gauge is installed in the first silo and includes a second ultra-high level gauge, a second high level gauge, and a second low level gauge, which are used to detect the ultra-high level, high level, and low level of the first silo, respectively, so as to provide alarms for ultra-high level, high level, and low level. The second ash discharge valve is installed at the bottom of the first silo and is connected to the coal loading dust removal fan for synchronized operation. The second ash discharge valve is connected to the coal loading dust removal pipeline through the second conveying pipe, which is also connected to the second compressed air pipeline. The second solenoid valve is installed on the second compressed air pipeline and is connected to the coal loading dust removal fan for synchronized operation, controlling the introduction of compressed air to spray the desulfurizing agent. A first flue gas outlet is also provided at the top of the first silo. The first flue gas outlet is connected to the coal loading dust removal pipeline through the first flue gas pipeline to discharge the dust from the top of the first silo and further remove dust.

[0011] Furthermore, the front end of the coal charging desulfurization pre-coating device is also equipped with a coke discharge collecting scraper conveyor and a coke discharge bucket elevator in sequence. The coke discharge collecting scraper conveyor is connected to the coke discharge scraper ash conveyor. The coke discharge desulfurization ash output by the coke discharge scraper ash conveyor enters the first hopper of the coal charging desulfurization pre-coating device after passing through the coke discharge collecting scraper conveyor and the coke discharge bucket elevator in sequence.

[0012] Furthermore, several coke discharge bag dust collectors and several coal charging bag dust collectors are arranged in parallel. The clean gas outlets of the coke discharge bag dust collectors and the clean gas outlets of the coal charging bag dust collectors are respectively connected to the coke discharge clean gas pipeline and the coal charging clean gas pipeline. The flue gas inlets of the coke discharge bag dust collectors and the flue gas inlets of the coal charging bag dust collectors are respectively connected to the coke discharge dust removal pipeline and the coal charging dust removal pipeline. The coke discharge desulfurization ash outlets of the coke discharge bag dust collectors and the coal charging desulfurization ash outlets of the coal charging bag dust collectors are respectively connected to the coke discharge scraper conveyor and the coal charging scraper conveyor.

[0013] Furthermore, a coking dust removal silencer is installed between the coking dust removal fan and the coking dust removal chimney, and a coal charging dust removal silencer is installed between the coal charging dust removal fan and the coal charging dust removal chimney.

[0014] Furthermore, the dust storage device includes a coal charging bucket elevator, a dust silo, and a suction and unloading device. The coal charging bucket elevator is connected to the second ash conveying pipeline, and the outlet of the coal charging bucket elevator is connected to the inlet of the dust silo. The desulfurization ash from the coal charging bucket elevator is transported to the dust silo for storage. The suction and unloading device is located at the bottom of the dust silo and is used to suction the dust in the dust silo to a dust transport vehicle. A second flue gas outlet is also provided at the top of the dust silo. The second flue gas outlet is connected to the coal charging dust removal pipeline through a second flue gas pipeline to discharge the dust from the top of the dust silo and further remove dust.

[0015] This invention features a pre-coating device for desulfurization of coke outlet dust collectors. The coke outlet dust reacts with the pre-coated desulfurizing agent, adsorbing and removing sulfur-containing substances. This ensures that the sulfur content in the purified gas after coke outlet desulfurization meets emission standards, while also extending the service life of the dust collector bags. The desulfurized ash from the coke outlet desulfurization and dust removal system is transported to a hopper on the coal charging desulfurization pre-coating device, serving as the pre-coating material for the coal charging bag filter. Since the desulfurized ash contains coke powder and desulfurizing agent, when sprayed onto the outer surface of the coal charging bag filter, it reacts with the coal charging dust, adsorbing the sulfur content of the coal. The sulfur-containing substances in the flue gas effectively control the emission of sulfur dioxide in the coal charging dust removal system, ensuring that the clean gas after coal charging dust removal meets emission standards. The recycling of coke desulfurization ash also reduces the amount of desulfurizing agent used. The coke desulfurization dust removal system is also equipped with a secondary coal charging desulfurization pre-spraying device, which is linked to the sulfur dioxide concentration sensor in the coal charging dust collector. When the sulfur dioxide concentration in the flue gas exceeds the set value, the secondary pre-spraying system is activated, and the amount of desulfurizing agent injected is adjusted in real time according to the sulfur dioxide concentration, ensuring that the system can perform desulfurization efficiently while saving the amount of desulfurizing agent used. Attached Figure Description

[0016] Figure 1 This is a system flowchart of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram showing the connection between the coke desulfurization pre-coating device and the coke high-temperature flue dust cooling and separation flame arrestor in this embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the connection of the secondary coal loading desulfurization pre-spraying device in an embodiment of this utility model.

[0019] Figure 4 This is a schematic diagram showing the connection between the coal loading desulfurization pre-spraying device and the spark arrester in an embodiment of this utility model.

[0020] Figure 5 This is a schematic diagram of the connection of the dust storage device in an embodiment of this utility model.

[0021] Figure 6 This is a schematic diagram showing the connection between the coke discharge bag dust collector, the coke discharge dust removal fan, and the compressed air conveying in an embodiment of this utility model.

[0022] Figure 7 This is a schematic diagram showing the connection of the coal-loading bag dust collector, the coal-loading dust removal fan, and the coal-loading dust removal chimney in an embodiment of this utility model.

[0023] Figure labels: 1-Coal charging bag dust collector; 2-Coal charging dust collector fan; 3-Coal charging dust collector variable frequency motor; 4-Compressed air storage tank; 5-Coal charging dust collector flue gas switching valve; 6-Coal charging dust collector pipeline; 7-Secondary coal charging desulfurization pre-coating device; 8-Ash extraction and unloading device; 9-Coal charging desulfurization pre-coating device; 10-Coal charging dust collector silencer; 11-Coal charging dust collector chimney; 12-Spark catcher; 13-Coke discharge desulfurization pre-coating device; 14-First conveying pipe; 15-Coke discharge bag dust collector; 16-Coke discharge high-temperature flue gas cooling and separation flame arrester; 17 18-Coke outlet dust removal fan; 19-Coke outlet dust removal variable frequency motor; 20-Dust transport vehicle; 21-Coke outlet dust removal flue gas switching valve; 22-Coke outlet dust removal pipeline; 23-Coke outlet dust removal silencer; 24-Coke outlet dust removal chimney; 25-Coke outlet scraper conveyor; 26-First ash conveying pipeline; 27-Coal charging scraper conveyor; 28-Coal charging clean gas pipeline; 29-Dust silo; 30-Second conveying pipe; 31-Second ash conveying pipeline; 32-Coke outlet collecting scraper conveyor; 33-Coke outlet bucket elevator; 34-Third conveying pipe; 35-Coal bucket elevator; 36-Second flue gas duct; 71-Second silo; 72-First level gauge; 73-First ash discharge valve; 74-First solenoid valve; 75-First compressed air duct; 91-First silo; 92-Second level gauge; 93-Second ash discharge valve; 94-Second solenoid valve; 95-Pressure reducing device; 96-First flue gas duct; 97-Second compressed air duct; 121-Second flue gas inlet; 122-Second flue gas outlet; 123-Second dust outlet; 161-First flue gas inlet; 162-First flue gas outlet; 163-First dust outlet. Detailed Implementation

[0024] A combined coal charging and coke discharging dust removal and pre-coating desulfurization system, such as Figure 1 As shown, it includes a coke discharge bag filter 15, a coal charging bag filter 1, a coke discharge desulfurization pre-coating device 13, a coal charging desulfurization pre-coating device 9, a dust storage device, a coke discharge dust removal fan 17, a coal charging dust removal fan 2, a coke discharge dust removal chimney 24, and a coal charging dust removal chimney 11, as follows. Figure 6The clean gas outlet of the coke discharge bag filter 15 is connected in sequence to the coke discharge dust removal fan 17 and the coke discharge dust removal chimney 24 via the coke discharge clean gas pipeline 22. The clean gas treated by the coke discharge bag filter 15 is then discharged from the coke discharge dust removal chimney 24 via the coke discharge dust removal fan 17. The flue gas inlet of the coke discharge bag filter 15 is connected to the coke discharge system via the coke discharge dust removal pipeline 21, such as... Figure 2 As shown, the coking system includes a coking car, with a coking car suction hood on top. A coking dust removal flue gas switching valve 20 is installed on the coking car suction hood, and a coking dust removal pipeline 21 is connected to the coking dust removal flue gas switching valve 20. The powder outlet of the coking desulfurization pre-coating device 13 is connected to the coking dust removal pipeline 21 via a first conveying pipe 14, which is used to spray the desulfurization pre-coating powder onto the surface of the dust collection bags in the coking bag filter 15 under the action of the coking dust removal fan 17. The desulfurization pre-coating powder can be a conventional desulfurizing agent, such as powder containing limestone. The desulfurizing agent can be transported by external tanker truck ash-pumping and stored in the hopper of the coking desulfurization pre-coating device 13. This desulfurizing agent is pre-coated onto the surface of the dust collection bags by the coking desulfurization pre-coating device 13, reacting with acidic substances such as sulfur dioxide in the flue gas to achieve desulfurization, ensuring that the sulfur content in the discharged clean gas meets the requirements. The coke discharge desulfurization ash outlet of the coke bag dust collector 15 is connected to the coke discharge scraper ash conveyor 25. The coal charging desulfurization pre-coating device 9 is equipped with a first silo 91 for storing desulfurization pre-coating powder. The coke discharge scraper ash conveyor 25 is connected to the inlet of the first silo 91 of the coal charging desulfurization pre-coating device 9 through the first ash conveying pipe 26, which is used to transport the coke discharge desulfurization ash from the coke bag dust collector 15 to the first silo 91, which is used as the pre-coating powder for the coal charging desulfurization pre-coating device 9. The coke discharge desulfurization ash contains coke powder, desulfurizing agent and other components. It is pre-coated on the surface of the dust collection bag in the coal charging bag dust collector 1, which can adsorb tar, sulfur dioxide and other substances in the coal charging dust collection flue gas.

[0025] like Figure 7 The clean gas outlet of the coal-loading bag filter 1 is connected in sequence to the coal-loading dust collector fan 2 and the coal-loading dust collector chimney 11 via a coal-loading clean gas pipeline 28. The clean gas treated by the coal-loading bag filter 1 is then discharged from the coal-loading dust collector chimney 11 via the coal-loading dust collector fan 2. The flue gas inlet of the coal-loading bag filter 1 is connected to the coal-loading system via a coal-loading dust collector pipeline 6, such as... Figure 2As shown, the coal charging system includes a coal charging car located on top of the coke oven. A coal charging dust removal flue gas switching valve 5 is installed on the top of the coal charging car, and a coal charging dust removal pipe 6 is connected to the coal charging dust removal flue gas switching valve 5. The powder outlet of the coal charging desulfurization pre-coating device 9 is connected to the coal charging dust removal pipe 6 via a second conveying pipe 30, allowing the desulfurization pre-coating powder in the first silo 91 to be sprayed onto the surface of the dust collection bags in the coal charging baghouse dust collector 1 under the action of the coal charging dust removal fan 2. The desulfurization pre-coating powder in the first silo 91 is the desulfurized ash from the coke discharge baghouse dust collector 15. The desulfurization ash outlet of the coal charging baghouse dust collector 1 is connected to a coal charging scraper conveyor 27, which is connected to the dust storage device via a second ash conveying pipe 31, for conveying the desulfurization ash from the coal charging baghouse dust collector 1 to the dust storage device. In this way, the desulfurization ash from the coke bag filter 15 is used as a pre-spray desulfurization powder for coal charging dust removal, so that resources can be reused without reloading desulfurizing agent or pre-spray powder.

[0026] In this embodiment, as Figure 1 Both the coke discharge bag dust collector 15 and the coal charging bag dust collector 1 are arranged in parallel with several units. The coke discharge bag dust collector 15 is arranged in two parallel groups, each group having 7 dust collection chambers sharing one coke discharge scraper conveyor 25. The two groups together have 14 dust collection chambers and two coke discharge scraper conveyors 25. The outlets of both coke discharge scraper conveyors 25 are simultaneously connected to the first ash conveying pipe 26. The coal charging bag dust collector 1 has 6 dust collection chambers arranged in parallel, sharing one coal charging bag conveyor 26. The coal scraper conveyor 27 has its outlet connected to the second ash conveying pipe 31. The clean air outlets of 14 coke discharge bag dust collectors 15 are connected to the coke discharge clean air pipe 22, and the clean air outlets of 6 coal charging bag dust collectors 1 are connected to the coal charging clean air pipe 28. The flue gas inlets of the 14 coke discharge bag dust collectors 15 and the 6 coal charging bag dust collectors 1 are respectively connected to the coke discharge dust removal pipe 21 and the coal charging dust removal pipe 6.

[0027] To improve the desulfurization effect of the coal-loading bag filter 1, such as Figure 1 , Figure 3This embodiment also includes a secondary coal loading desulfurization pre-spraying device 97. The secondary coal loading desulfurization pre-spraying device 97 is equipped with a second silo 71 for storing desulfurizing agent. The powder outlet of the secondary coal loading desulfurization pre-spraying device 97 is connected to the coal loading dust removal pipeline 6 through a third conveying pipe 34. A sulfur dioxide concentration sensor is installed at the clean gas outlet of the coal loading bag dust collector 1 to detect the sulfur dioxide concentration in the flue gas discharged from the coal loading bag dust collector 1. The secondary coal loading desulfurization pre-spraying device 97 is connected to the sulfur dioxide concentration sensor and is used to start the desulfurization pre-spraying operation when the sulfur dioxide concentration in the flue gas exceeds the set value, so that the desulfurizing agent in the second silo 71 is sprayed onto the surface of the dust collection bag in the coal loading bag dust collector 1 under the action of the coal loading dust removal fan 2 for secondary pre-spraying.

[0028] As one implementation method, such as Figure 3 The secondary coal loading desulfurization pre-spraying device 97 further includes a first level gauge 72, a first ash discharge valve 73, and a first solenoid valve 74. The first level gauge 72 is installed in the second silo 71 and includes a first ultra-high level gauge, a first high level gauge, and a first low level gauge, which are used to detect the ultra-high level, high level, and low level of the second silo 71, respectively, so as to trigger alarms for ultra-high level, high level, and low level. The first ash discharge valve 73 is installed at the bottom of the second silo 71 and is connected to a sulfur dioxide concentration sensor for synchronous operation. The first ash discharge valve 73 is connected to the coal loading dust removal pipe 6 through the third conveying pipe 34, which is also connected to the first compressed air pipe 75. The first solenoid valve 74 is installed on the first compressed air pipe 75 and is linked to the sulfur dioxide concentration sensor for synchronous operation. The compressed air is controlled by the first solenoid valve 74 and performs desulfurization agent injection in sync with the sulfur dioxide alarm signal of the first ash discharge valve 73. A pressure reducing device can also be installed on the first compressed air pipeline 75 to control the pressure of the electromagnetic pressure reducing valve. When the sulfur dioxide concentration sensor in the coal charging dust collector detects that the sulfur dioxide concentration in the flue gas exceeds the set value, the secondary pre-coating system is activated.

[0029] The structure of the coke discharge desulfurization pre-spraying device 13 is similar to that of the secondary coal charging desulfurization pre-spraying device 97. The ash discharge valve and solenoid valve at the bottom are linked with the coke discharge dust removal fan 17 to spray desulfurizing agent.

[0030] In this embodiment, as Figure 4The coal loading desulfurization pre-spraying device 9 further includes a second level gauge 92, a second ash discharge valve 93, and a second solenoid valve 94. The second level gauge 92 is installed in the first silo 91 and includes a second high level gauge, a second high level gauge, and a second low level gauge, which are used to detect the high, high, and low levels of the first silo 91, respectively, so as to provide alarms for the high, high, and low levels. The second ash discharge valve 93 is located at the bottom of the first silo 91 and is connected to the coal loading dust removal fan 2 for synchronous operation. The second ash discharge valve 93 is connected to the coal loading dust removal pipeline 6 through the second conveying pipe 30, which is also connected to the second compressed air pipeline 97. The second solenoid valve 94 is installed on the second compressed air pipeline 97 and is linked to the coal loading dust removal fan 2 for synchronous operation, controlling the introduction of compressed air to spray the desulfurizing agent. A pressure reducing device 95 may also be installed on the second compressed air pipeline 97 to control the pressure of the solenoid pressure reducing valve. The top of the first silo 91 is also provided with a first flue gas outlet 162, which is connected to the coal charging dust removal pipe 6 through a first flue gas pipe 96 to discharge the dust from the top of the first silo 91. The discharged dust is connected to the coal charging dust removal pipe 6 through the first flue gas pipe 96 and then enters the coal charging bag filter 1 for further dust removal. The coal charging desulfurization pre-spraying device 9 is synchronously operated by the high-speed signal of the coal charging dust removal fan 2. The first compressed air pipe 75 and the second compressed air pipe 97 can be connected to the compressed air storage tank 4 at the same time.

[0031] The working process of pre-coating for coal desulfurization can be as follows: At the beginning of coal charging, the desulfurization ash from coke discharge is used as the coating material for the first pre-coating. When the second ash discharge valve 93 at the bottom of the first hopper 91 of the coal charging desulfurization pre-coating device 9 receives the start signal synchronized with the high speed of the coal charging dust removal fan 2, it starts to work. The second ash discharge valve 93 sprays the set coke discharge desulfurization ash into the coal charging dust removal pipe 6. The coke discharge desulfurization ash contains coke powder, desulfurizing agent, etc., which can adsorb tar, sulfur dioxide and other substances in the flue gas of coal charging dust removal. When the sulfur dioxide concentration sensor in the coal charging bag dust collector 1 detects that the sulfur dioxide concentration in the flue gas exceeds the set value, the secondary coal charging desulfurization pre-coating device 97 is started. The amount of desulfurizing agent injected is adjusted in real time according to the sulfur dioxide concentration, which ensures that the system can carry out desulfurization efficiently and save the amount of desulfurizing agent used.

[0032] In this embodiment, as Figure 4The front end of the coal charging desulfurization pre-coating device 9 is also sequentially equipped with a coking collection scraper conveyor 32 and a coking bucket elevator 33. The coking collection scraper conveyor 32 is connected to the coking scraper ash conveyor 25. The coking desulfurization ash output by the coking scraper ash conveyor 25 enters the first hopper 91 of the coal charging desulfurization pre-coating device 9 after passing through the coking collection scraper conveyor 32 and the coking bucket elevator 33. The coking collection scraper conveyor 32 is located at the rear end of the coking scraper ash conveyor 25, and its position and number can be arranged according to the layout of the coking scraper ash conveyor 25 and the first ash conveying pipe 26.

[0033] To ensure security, such as Figure 2 The coke outlet bag filter 15 is also equipped with a coke outlet high-temperature dust cooling and separation flame arrester 16 at the flue gas inlet. It is located at the rear end of the coke outlet desulfurization pre-coating device 13 and is used for cooling, flame arresting and separation of flue gas before dust removal. The coke outlet high-temperature dust cooling and separation flame arrester 16 includes a first flue gas inlet 161, a first flue gas outlet 162 and a first dust outlet 163. The first flue gas inlet 161 is connected to the coke outlet dust removal pipeline 21. The first flue gas outlet 162 is connected to the flue gas inlet of the coke outlet bag filter 15. The first dust outlet 163 is located at the bottom of the coke outlet high-temperature dust cooling and separation flame arrester 16 and is connected to the first ash conveying pipeline 26. After cooling and separation, the flue gas enters the coke outlet bag filter 15. The separated dust enters the first hopper 91 of the coal charging desulfurization pre-coating device 9 together with the dust separated by the coke outlet bag filter 15.

[0034] To further improve security, such as Figure 4 A spark catcher 12 is also provided at the flue gas inlet of the coal-loading bag dust collector 1. The spark catcher 12 is located at the rear end of the coal-loading desulfurization pre-coating device 9 and is used for spark capture and separation. The spark catcher 12 includes a second flue gas inlet 121, a second flue gas outlet 122 and a second dust outlet 123. The second flue gas inlet 121 is connected to the coal-loading dust collection pipe 6, the second flue gas outlet 122 is connected to the flue gas inlet of the coal-loading bag dust collector 1, and the second dust outlet 123 is located at the bottom of the spark catcher 12 and is connected to the second ash conveying pipe 31. After the flue gas is cooled and separated, it enters the coal-loading bag dust collector 1. The separated dust enters the dust storage device together with the dust separated by the coal-loading bag dust collector 1.

[0035] In this embodiment, as Figure 6 , Figure 7A coking dust removal silencer 23 is also installed between the coking dust removal fan 17 and the coking dust removal chimney 24, and a coal charging dust removal silencer 10 is also installed between the coal charging dust removal fan 2 and the coal charging dust removal chimney 11. Both the coking dust removal fan 17 and the coal charging dust removal fan 2 are equipped with an inlet valve and a variable frequency fan, namely a coking dust removal variable frequency motor 18 and a coal charging dust removal variable frequency motor 3, respectively.

[0036] like Figure 5 The dust storage device includes a coal charging bucket elevator 35, a dust silo 29, and a suction and unloading device 8. The coal charging bucket elevator 35 is connected to the second ash conveying pipe 31, and the outlet of the coal charging bucket elevator 35 is connected to the inlet of the dust silo 29. The desulfurization ash from the coal charging bucket elevator 35 is transported to the dust silo 29 for storage. The suction and unloading device 8 is located at the bottom of the dust silo 29 and is used to suction the dust in the dust silo 29 to the dust transport vehicle 19. The top of the dust silo 29 is also provided with a second flue gas outlet 122, which is connected to the coal charging dust removal pipe 6 through a second flue gas pipe 36 to discharge the dust on the top of the dust silo 29 and further remove dust.

[0037] The above detailed description is a specific description of a feasible embodiment of the present utility model. This embodiment is not intended to limit the patent scope of the present utility model. All equivalent implementations or modifications that do not depart from the present utility model should be included in the patent scope of this case.

Claims

1. A combined coal charging and coke discharging dust removal and pre-coating desulfurization system, characterized in that, The system includes a coke discharge baghouse dust collector, a coal charging baghouse dust collector, a coke discharge desulfurization pre-coating device, a coal charging desulfurization pre-coating device, a dust storage device, a coke discharge dust removal fan, a coal charging dust removal fan, a coke discharge dust removal chimney, and a coal charging dust removal chimney. The clean gas outlet of the coke discharge baghouse dust collector is connected to the coke discharge dust removal fan and the coke discharge dust removal chimney in sequence via a coke discharge clean gas pipeline. The flue gas inlet of the coke discharge baghouse dust collector is connected to the coke discharge system via a coke discharge dust removal pipeline. The powder outlet of the coke discharge desulfurization pre-coating device is connected to the coke discharge dust removal pipeline via a first conveying pipe. The coke discharge desulfurization ash outlet of the coke discharge baghouse dust collector is connected to a coke discharge scraper conveyor. The coal charging desulfurization pre-coating device is equipped with a first silo for storing desulfurization pre-coating powder. The coke discharge scraper conveyor... The ash conveyor is connected to the feed inlet of the first silo via a first ash conveying pipe, used to transport the desulfurized ash from the coke bag filter to the first silo of the coal charging desulfurization pre-coating device; the clean gas outlet of the coal charging bag filter is connected in sequence to the coal charging dust removal fan and the coal charging dust removal chimney via a coal charging clean gas pipe; the flue gas inlet of the coal charging bag filter is connected to the coal charging system via a coal charging dust removal pipe; the powder outlet of the coal charging desulfurization pre-coating device is connected to the coal charging dust removal pipe via a second conveying pipe; the desulfurized ash outlet of the coal charging bag filter is connected to the coal charging scraper ash conveyor; the coal charging scraper ash conveyor is connected to the dust storage device via a second ash conveying pipe, used to transport the desulfurized ash from the coal charging bag filter to the dust storage device.

2. The dust removal and pre-coating desulfurization system combining coal charging and coking as described in claim 1, characterized in that, It also includes a secondary coal loading desulfurization pre-spraying device, which is equipped with a second silo for storing desulfurizing agent. The powder outlet of the secondary coal loading desulfurization pre-spraying device is connected to the coal loading dust removal pipeline through a third conveying pipe. A sulfur dioxide concentration sensor is installed at the clean gas outlet of the coal loading bag dust collector to detect the sulfur dioxide concentration in the flue gas discharged from the coal loading bag dust collector. The secondary coal loading desulfurization pre-spraying device is connected to the sulfur dioxide concentration sensor and is used to start the desulfurization pre-spraying operation when the sulfur dioxide concentration in the flue gas exceeds the set value, so that the desulfurizing agent in the second silo is sprayed onto the surface of the dust collection bag in the coal loading bag dust collector under the action of the coal loading dust removal fan for secondary pre-spraying.

3. The dust removal and pre-coating desulfurization system combining coal charging and coking as described in claim 2, characterized in that, The secondary coal loading desulfurization pre-spraying device also includes a first level gauge, a first ash discharge valve, and a first solenoid valve. The first level gauge is installed in the second silo and includes a first ultra-high level gauge, a first high level gauge, and a first low level gauge, which are used to detect the ultra-high level, high level, and low level of the second silo, respectively. The first ash discharge valve is installed at the bottom of the second silo and is connected to a sulfur dioxide concentration sensor for linkage operation. The first ash discharge valve is connected to the coal loading dust removal pipeline through the third conveying pipe, which is also connected to the first compressed air pipeline. The first solenoid valve is installed on the first compressed air pipeline and is connected to the sulfur dioxide concentration sensor for linkage operation, controlling the introduction of compressed air to spray desulfurizing agent.

4. The dust removal and pre-coating desulfurization system combining coal charging and coke discharging according to claim 1, characterized in that, A coke outlet high-temperature flue gas cooling and separation flame arrester is also installed at the flue gas inlet of the coke outlet bag filter. The coke outlet high-temperature flue gas cooling and separation flame arrester is located at the rear end of the coke outlet desulfurization pre-coating device and is used for cooling, flame arresting and separation of flue gas before dust removal. The coke outlet high-temperature flue gas cooling and separation flame arrester includes a first flue gas inlet, a first flue gas outlet and a first dust outlet. The first flue gas inlet is connected to the coke outlet dust removal pipeline, the first flue gas outlet is connected to the flue gas inlet of the coke outlet bag filter, and the first dust outlet is located at the bottom of the coke outlet high-temperature flue gas cooling and separation flame arrester. The first dust outlet is connected to the first ash conveying pipeline. The separated dust enters the first hopper of the coal charging desulfurization pre-coating device.

5. The dust removal and pre-coating desulfurization system combining coal charging and coking as described in claim 1, characterized in that, A spark catcher is also installed at the flue gas inlet of the coal-loading bag filter, and the spark catcher is located at the rear end of the coal-loading desulfurization pre-coating device for spark capture and separation. The spark catcher includes a second flue gas inlet, a second flue gas outlet and a second dust outlet. The second flue gas inlet is connected to the coal-loading dust collection pipeline, the second flue gas outlet is connected to the flue gas inlet of the coal-loading bag filter, and the second dust outlet is located at the bottom of the spark catcher and is connected to the second ash conveying pipeline. The separated dust enters the dust storage device.

6. The dust removal and pre-coating desulfurization system combining coal charging and coke discharging according to claim 1, characterized in that, The coal loading desulfurization pre-spraying device also includes a second level gauge, a second ash discharge valve, and a second solenoid valve. The second level gauge is installed in the first silo and includes a second ultra-high level gauge, a second high level gauge, and a second low level gauge, which are used to detect the ultra-high level, high level, and low level of the first silo, respectively. The second ash discharge valve is installed at the bottom of the first silo and is connected to the coal loading dust removal fan for synchronous operation. The second ash discharge valve is connected to the coal loading dust removal pipeline through the second conveying pipe, which is also connected to the second compressed air pipeline. The second solenoid valve is installed on the second compressed air pipeline and is connected to the coal loading dust removal fan for synchronous operation, controlling the introduction of compressed air to spray the desulfurizing agent. A first flue gas outlet is also provided at the top of the first silo. The first flue gas outlet is connected to the coal loading dust removal pipeline through the first flue gas pipeline to discharge the dust from the top of the first silo and further remove dust.

7. A combined coal charging and coke discharging dust removal and pre-coating desulfurization system according to claim 6, characterized in that, The front end of the coal charging desulfurization pre-coating device is also equipped with a coke discharge collection scraper conveyor and a coke discharge bucket elevator in sequence. The coke discharge collection scraper conveyor is connected to the coke discharge scraper ash conveyor. The coke discharge desulfurization ash output by the coke discharge scraper ash conveyor enters the first hopper of the coal charging desulfurization pre-coating device after passing through the coke discharge collection scraper conveyor and the coke discharge bucket elevator in sequence.

8. The dust removal and pre-coating desulfurization system combining coal charging and coke discharging according to claim 1, characterized in that, The coke discharge bag filter and the coal charging bag filter are each provided in a parallel arrangement of several units. The clean gas outlets of the coke discharge bag filter and the clean gas outlets of the coal charging bag filter are respectively connected to the coke discharge clean gas pipeline and the coal charging clean gas pipeline. The flue gas inlets of the coke discharge bag filter and the coal charging bag filter are respectively connected to the coke discharge dust removal pipeline and the coal charging dust removal pipeline. The coke discharge desulfurization ash outlets of the coke discharge bag filter and the coal charging desulfurization ash outlets of the coal charging bag filter are respectively connected to the coke discharge scraper conveyor and the coal charging scraper conveyor.

9. A combined coal charging and coke discharging dust removal and pre-coating desulfurization system according to claim 1, characterized in that, A coke discharge dust removal silencer is also installed between the coke discharge dust removal fan and the coke discharge dust removal chimney, and a coal charging dust removal silencer is also installed between the coal charging dust removal fan and the coal charging dust removal chimney.

10. A combined coal charging and coke discharging dust removal and pre-coating desulfurization system according to claim 1, characterized in that, The dust storage device includes a coal charging bucket elevator, a dust silo, and a suction and unloading device. The coal charging bucket elevator is connected to the second ash conveying pipeline, and the outlet of the coal charging bucket elevator is connected to the inlet of the dust silo. The desulfurization ash from the coal charging bucket elevator is transported to the dust silo for storage. The suction and unloading device is located at the bottom of the dust silo and is used to suction the dust in the dust silo to the dust transport vehicle. The top of the dust silo is also provided with a second flue gas outlet, which is connected to the coal charging dust removal pipe through a second flue gas pipe to discharge the dust from the top of the dust silo and further remove dust.

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