Industrial smoke dust collection-purification-underground filling utilization device and method

Abstract

The invention discloses an industrial smoke dust collecting-purifying-underground filling and utilizing device and method, according to the method, waste smoke dust gas discharged industrially is collected, a ground dust removing device and a smoke gas purifying device are used for dust removal and decontamination treatment, and after the waste smoke dust gas reaches the emission standard, the waste smoke dust gas is discharged into the air; and the collected solid dust is unloaded to a stock bin and conveyed to a ground slurrying station to be prepared into filling slurry, then the filling slurry is pumped to the position near an underground filling point through a conveying pipeline, the filling slurry is fully mixed with a curing agent and then filled into a goaf, and therefore the purposes of industrial smoke dust resource utilization and overlying strata migration control through filling mining are achieved.

Description

Technical Field

[0001] The present invention belongs to the field of air pollution prevention and control, solid waste utilization and mine safety technology, and specifically relates to an industrial smoke collection-purification-underground filling and utilization device and method. Background Art

[0002] A large amount of gas containing pollutants is generated during industrial production, usually containing small metal and non-metal particles, as well as harmful gases such as sulfur dioxide, nitrogen oxides and hydrocarbons. Such gases are called industrial smoke or industrial waste gas. As a typical atmospheric pollutant, large-scale emissions of industrial smoke will cause environmental problems such as greenhouse effect, ozone layer depletion, and acid rain. Long-term human exposure will cause skin diseases and respiratory diseases, which seriously endangers human health. At present, air governance should focus on optimizing and improving ultra-low emissions and controlling unconventional pollutants. As the main source of industrial smoke, the coal-fired power industry faces tremendous pressure to reduce atmospheric pollutants and control flue gas.

[0003] Industrial smoke comes from a wide range of sources and is extremely complex in nature. Common dust removal devices are used to separate solid particles from gases, but the purification effect of polluted gases is poor, and there is a problem of smoke accumulation, which is easy to cause secondary pollution. At present, it is mainly treated by recycling industrial smoke and separating useful substances. The byproducts of smoke purification contain valuable components such as TiO2 and SiO2, which can be used in construction, building materials, rubber and plastics, fire prevention, refractory materials and other industries after recycling and processing. However, the production cost is high, which restricts the process of resource utilization of industrial smoke. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an industrial smoke collection-purification-underground filling utilization device and method, which collects and purifies industrial smoke to reduce air pollution, and processes the removed dry ash into underground filling material, thereby realizing the resource utilization of industrial smoke.

[0005] Technical solution: To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] The first object of the present invention is to provide an industrial smoke collection-purification-underground filling device, comprising a dust removal device, a smoke purification system, a dry ash conveying device and an underground filling system, wherein the air outlet of the dust removal device is connected to the air inlet of the smoke purification system, and the lower parts of the dust removal device and the smoke purification system are both provided with an ash hopper, and the ash hopper is connected to the dry ash conveying device, and the dry ash in the dry ash conveying device is collected and stored in a ground ash bin; wherein,

[0007] The dust removal device comprises a pre-processor and a bag dust collector, wherein the front end of the smoke inlet of the pre-processor is connected with a dust collecting hood and a cooler in sequence, and vertical baffles are arranged at intervals at the upper and lower parts of the pre-processor; the bag dust collector is provided with a plurality of vertical filter bags, and a dust cleaning mechanism is provided above the filter bags, and the dust cleaning mechanism comprises an air bag, a pulse valve, and a blow pipe, and the blow pipe is transversely arranged above the filter bags, and has a plurality of air outlet holes corresponding to the filter bags below, and the air inlet end of the blow pipe is located outside the bag dust collector, and is connected to the pulse valve and the air bag;

[0008] The flue gas purification system comprises a desulfurization device and a denitration device which are connected in sequence, and the air outlet of the bag filter is connected to the air inlet of the desulfurization device located at the bottom.

[0009] Optionally, in some embodiments of the present invention, the interior of the ash hopper is smooth and flat, and the angle between the inclined wall of the ash hopper and the horizontal plane is not less than 60°.

[0010] Optionally, in some embodiments of the present invention, the inner side of the intersection angle of adjacent walls of the ash hopper is arc-shaped, and the radius of the arc is 200 mm.

[0011] Optionally, in some embodiments of the present invention, an ash discharge valve is provided at the connection between the ash hopper and the dry ash conveying device below, and dry ash falls into the dry ash conveying device after the valve of the ash discharge valve is opened.

[0012] Optionally, in some embodiments of the present invention, the bag filter has filter material therein, and the filter material includes polytetrafluoroethylene.

[0013] Optionally, in some embodiments of the present invention, the outer box body of the bag filter is a steel structure, and the outer box body and the filter bag are matched with a gap.

[0014] Optionally, in some embodiments of the present invention, the bag filter is provided with a pressure difference monitoring device for automatically monitoring the resistance inside the bag filter, and the pressure difference monitoring device is connected to the signal of the cleaning mechanism.

[0015] Optionally, in some embodiments of the present invention, the pressure difference monitoring device includes a total pressure difference monitoring device and a chamber pressure difference monitoring device.

[0016] Optionally, in some embodiments of the present invention, the pre-processor is used to capture coarse particles larger than 10 to 20 μm, and the spacing between adjacent baffles is the same.

[0017] Optionally, in some embodiments of the present invention, when treating smoke of different concentrations and particle sizes, the baffle spacing and baffle height need to be adjusted to satisfy the dust removal efficiency η≥70%, wherein specifically, the calculation formula of the dust removal efficiency η is as follows:

[0018]

[0019] Where ρ is the dust density, kg / m 3 ; d is the average particle size of dust particles, m; v is the air flow velocity, m / s; n is the number of baffles, μ is the dynamic viscosity, Pa·s; H is the baffle height, m.

[0020] Optionally, in some embodiments of the present invention, the desulfurization device includes a desulfurization reactor, the powder bin stores a desulfurizer, and is connected to the powder inlet of the desulfurization reactor at the bottom via an air pump. A first flow equalizing device is provided inside the desulfurization reactor, and the first flow equalizing device is located above the air inlet and the powder inlet of the desulfurization reactor.

[0021] Optionally, in some embodiments of the present invention, the desulfurization agent includes sodium bicarbonate.

[0022] Optionally, in some embodiments of the present invention, a grinder is provided between the powder bin and the air pump.

[0023] Optionally, in some embodiments of the present invention, the denitrification device includes an SCR reactor and an ammonia supply system, and an air inlet and an ammonia inlet are respectively provided at the lower portion of the SCR reactor, and a second flow equalization device and at least one catalyst layer are sequentially provided at the upper portion.

[0024] Optionally, in some embodiments of the present invention, the ammonia supply system includes a liquid ammonia storage tank, an ammonia evaporator, an ammonia-air mixer and a first fan, the liquid ammonia storage tank is connected to the ammonia-air mixer via the ammonia evaporator, and the first fan is connected to the ammonia-air mixer.

[0025] Optionally, in some embodiments of the present invention, the air outlet of the desulfurization device located at the upper portion is connected to the air inlet of the denitrification device located at the lower portion.

[0026] Optionally, in some embodiments of the present invention, an air preheater is provided at the front end of the air inlet located at the lower portion of the denitration device.

[0027] Optionally, in some embodiments of the present invention, the upper air outlet of the denitration device is connected to the chimney via a second fan.

[0028] Optionally, in some embodiments of the present invention, the downhole filling system includes an ash storage tank, a slurry making device and a water storage tank located on the ground, and also includes a downhole grouting system located underground, wherein the ash storage tank and the water storage tank are both connected to the slurry making device, and the slurry making device is connected to the downhole grouting system via a conveying pipeline.

[0029] Optionally, in some embodiments of the present invention, the downhole grouting system includes a silo, a slurry storage tank and a grouting pump which are sequentially connected by pipelines.

[0030] The second object of the present invention is to provide an industrial smoke collection-purification-underground filling and utilization method, using any of the above-mentioned devices, the method comprising the following steps:

[0031] S1: Industrial smoke enters the dust collection pipeline along the dust collection hood, and is introduced into the dust removal device in sequence after being cooled by the cooler to separate the solid dust from the flue gas. The solid dust is collected in the dry ash conveying device through the ash hopper below;

[0032] S2: The flue gas discharged from the dust removal device enters the flue gas purification system, and the gas is desulfurized and denitrified in turn. x After the content reaches the emission standard, it is directly discharged into the atmosphere;

[0033] S3: The dry ash accumulated in the dust removal device is cleaned by the dust cleaning mechanism. The removed solid dust is dried and dehydrated, stored in the ash bin on the ground and transported to the pulping device in the mining area. After being mixed into slurry, it is pumped to the underground grouting system along the conveying pipeline;

[0034] S4: After the mortar is transported to the silo underground along the pipeline, the slurry is pumped to the slurry storage tank and mixed with the curing agent. After the grouting point is determined, the drilling is carried out and the grouting pipe is installed, and the grouting pump is used to fill it into the goaf.

[0035] Optionally, in some embodiments of the present invention, the curing agent includes an activator, a leveling agent, a stabilizer and an accelerating setting agent, and the curing agent and the mortar are mixed in a mass ratio of 1:9.

[0036] Optionally, in some embodiments of the present invention, the ammonia supply system of the denitration device dilutes the ammonia gas at a volume ratio of 1:20.

[0037] Optionally, in some embodiments of the present invention, the air inlet temperature of the bag filter is 230°C-280°C.

[0038] Optionally, in some embodiments of the present invention, the air inlet temperature of the bag filter is controlled by regulating a second fan at an air outlet of the flue gas purification system.

[0039] Further optionally, in some embodiments of the present invention, the air mixing valve on the inlet duct of the second fan is closed to reduce the total amount of smoke to increase the intake temperature; the air mixing valve on the inlet duct of the second fan is opened to mix fresh air into the system to lower the intake temperature.

[0040] Beneficial effects: The industrial smoke collection-purification-underground filling and utilization device and method provided by the present invention have the following advantages over the prior art:

[0041] 1. The present invention proposes a device and method that integrates "industrial smoke collection, purification treatment, and underground filling". Traditional smoke treatment devices usually only focus on the collection or purification of smoke. The present invention combines dust removal, purification and underground filling through a systematic design, effectively improving the utilization efficiency of smoke resources and reducing the risk of secondary pollution.

[0042] 2. The collected dry ash is used to prepare underground grouting materials, which realizes the reuse of resources, reduces the purchase and transportation costs of filling materials, and effectively fills the goaf, helping to improve the safety of the mine.

[0043] 3. After the collected smoke is slurried on the ground, it is transported to the underground through pipelines, realizing full-process automated grouting, which not only reduces labor costs but also improves the convenience and safety of underground construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the process of the present invention;

[0045] Figure 2 It is a schematic diagram of industrial smoke collection-purification system;

[0046] In the figure: Ⅰ-dust removal device, Ⅱ-desulfurization device, Ⅲ-denitrification device, 1-dust hood, 2-cooler, 3-preprocessor, 4-baffle, 5-ash hopper, 6-air bag, 7-pulse valve, 8-injection pipe, 9-bag dust collector, 10-filter bag, 11-powder bin, 12-grinder, 13-air pump, 14-desulfurization reactor, 15-1-first flow equalizing device, 15-2-second flow equalizing device, 16-SCR reactor, 17-catalyst layer, 18-air preheater, 19-ammonia-air mixer, 20-ammonia evaporator; 21-liquid ammonia storage tank, 22-1-first fan, 22-2-second fan, 23-chimney, 24-dry ash conveying device, 25-spiral dust collector.

[0047] Figure 3 It is a schematic diagram of the underground filling and utilization system of industrial smoke and dust;

[0048] In the figure: 26 - ash storage tank, 27 - water storage tank, 28 - pulping device, 29 - silo, 30 - pulp storage tank, 31 - grouting pump. DETAILED DESCRIPTION

[0049] An implementation case of the present invention is described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiment is only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] On the one hand, if Figure 2 and Figure 3 As shown, the present invention provides an industrial smoke collection-purification-underground filling device, comprising a dust removal device I, a gas purification system, a dry ash conveying device 24 and an underground filling system, wherein the air outlet of the dust removal device I is connected to the air inlet of the smoke purification system, and the lower parts of the dust removal device and the smoke purification system are both provided with an ash hopper 5, and the ash hopper 5 is connected to the dry ash conveying device 24, and the dry ash in the dry ash conveying device 24 is collected and stored in the ash storage tank 26 of the underground filling system.

[0051] Specifically, in some examples, the inside of the ash hopper 5 is smooth and flat, and the angle between the inclined wall of the ash hopper 5 and the horizontal plane is not less than 60°. The inner side of the intersection angle of adjacent walls of the ash hopper 5 is arc-shaped, and the radius of the arc is preferably 200 mm. The dust removal device I, the desulfurization device II and the denitrification device III are connected to the dry ash conveying device through the ash hopper 5. The ash hopper 5 serves as a storage space for dry ash, and an ash discharge valve is provided at the connection with the dry ash conveying device 24 below. After the ash discharge valve is opened, the dry ash falls to the dry ash conveying device 24. The solid products stripped by each device are collected uniformly, and the products are discharged by the spiral dust collector 25, and transported to the ground ash bin after dehydration.

[0052] Among them, the dust removal device I includes a pre-processor 3 and a bag dust collector 9. After pre-cooling, the industrial smoke first enters the pre-processor 3, and the gravity sedimentation of the dust particles is used to remove large particles of dust. Then the smoke enters the bag dust collector 9 for gas-solid separation.

[0053] Specifically, in some examples, the dust hood 1 and the cooler 2 are connected in sequence at the air inlet of the preprocessor 3. Vertical baffles 4 are arranged at intervals at the upper and lower parts of the preprocessor 3. The surface of the baffles is smooth, and flue gas pretreatment is achieved by intercepting large dust particles. The preprocessor 3 is a device that uses the inertia and gravity of dust particles for preliminary dust removal. It is used to capture coarse particles larger than 10 to 20 μm. The angle of the baffle 4 is fixed at 90°, and the distance between each baffle is the same. When dealing with smoke of different concentrations and particle sizes, it is necessary to adjust the baffle spacing (that is, the number of baffles n) and the baffle height H to achieve different set dust removal efficiencies η, so that it satisfies η ≥ 70%, wherein, specifically, the calculation formula for the dust removal efficiency η is as follows:

[0054]

[0055] Where ρ is the dust density, kg / m3 ; d is the average particle size of dust particles, m; v is the air flow velocity, m / s; n is the number of baffles, μ is the dynamic viscosity, Pa·s; H is the baffle height, m.

[0056] Specifically, in some examples, a plurality of vertical filter bags 10 are provided in the bag filter 9, and a cleaning mechanism is provided above the filter bag 10, the cleaning mechanism comprising an air bag 6, a pulse valve 7, and a blow pipe 8. The blow pipe 8 is transversely arranged above the filter bag 10, and has a plurality of air outlets corresponding to the filter bags below. The air inlet end of the blow pipe 8 is located outside the bag filter 9 and is connected to the pulse valve 7 and the air bag 6. The cleaning mechanism is composed of a pulse valve 7, an air bag 6, and a blow pipe 8. The pulse valve 7 is connected to the blow pipe 8 and the air bag 6, respectively. After the pulse valve 7 is opened, the compressed air in the air bag 6 is ejected through the small hole of the blow pipe 8 to generate a high-speed airflow, so that the dust outside the filter bag 10 falls off to the ash hopper 5 below to achieve cleaning.

[0057] Specifically, in some examples, the bag filter 9 is provided with a pressure difference monitoring device for automatically monitoring the resistance in the bag filter 9. The pressure difference monitoring device is connected to the signal of the dust cleaning mechanism. When the resistance reaches the set value, the dust cleaning mechanism will automatically start the jet to remove the dust attached to the filter bag 10 in the bag filter 9. In some examples, the bag filter 9 is provided with a total pressure difference monitoring device and a chamber pressure difference monitoring device.

[0058] Specifically, in some examples, the main body of the bag filter 9 includes filter material, filter bags and an outer box body, the filter material is made of polytetrafluoroethylene, which is a high temperature resistant material, and the outer box body is a steel structure with a gap between the filter bag and the filter bag. In some examples, the bag filter 9 is also equipped with an electric control cabinet, which is also equipped with temperature display, air valve dust discharge and control functions.

[0059] Specifically, in some examples, a temperature meter is provided at the front end of the bag filter 9 in the dust removal device I. When the temperature of the flue gas entering the bag filter 9 is less than 230°C, the air mixing valve provided on the inlet pipe of the second fan 22-2 should be closed to reduce the total amount of flue gas and ensure an intake temperature of 230°C to reduce the burden of air preheating during flue gas denitration. When the temperature of the flue gas entering the bag filter 9 is greater than 280°C, the air mixing valve provided on the inlet pipe of the second fan 22-2 should be opened to mix fresh air into the system, reduce the flue gas temperature, and allow the filter bag 10 to operate at a normal temperature to avoid high temperature damage to the filter material.

[0060] Among them, the purification system includes a desulfurization device II and a denitrification device III. The flue gas discharged from the dust removal device I is mixed with the desulfurizer in the desulfurization device II, and is transported to the denitrification device III after sufficient reaction to prevent the sulfur-containing flue gas from reacting with ammonia to form ammonium bisulfate and causing equipment corrosion. After flowing through the catalyst layer 17 in the device, the flue gas enters the air preheater 18 to make the flue gas temperature reach 340-380°C, and then is mixed with the dilute ammonia in the ammonia-air mixer 19 for reduction reaction. The clean flue gas that meets the purification standards is directly discharged into the atmosphere through the chimney 23.

[0061] In some examples, the air outlet of the bag filter 9 is connected to the air inlet of the desulfurization device II at the bottom. The desulfurization device II includes a desulfurization reactor 14, the powder bin 11 stores desulfurizer, and is connected to the powder inlet at the bottom of the desulfurization reactor 14 through an air pump 13. The desulfurization reactor 14 is provided with a first flow equalizing device 15-1, which is located above the air inlet and the powder inlet of the desulfurization reactor 14.

[0062] Specifically, in some examples, the desulfurization device II is composed of a powder bin 11, a grinder 12 and a desulfurization reactor 14. Sodium bicarbonate stored in the powder bin 11 is used as a desulfurizer. After being ground by the grinder 12, it is sprayed into the desulfurization reactor 14 through the wind power of the air pump 13 to react with SO2 to achieve flue gas desulfurization.

[0063] In some examples, the denitrification device III includes an SCR reactor 16 and an ammonia supply system, wherein an air inlet and an ammonia inlet are respectively provided at the lower portion of the SCR reactor 16, and a second flow equalizing device 15-2 and at least one catalyst layer 17 are sequentially provided at the upper portion. The main catalyst type in the catalyst layer 17 is a vanadium-titanium catalyst, and the main component is TiO2 / V2O5. The ammonia supply system includes a liquid ammonia storage tank 21, an ammonia evaporator 20, an ammonia-air mixer 19 and a first fan 22-1, wherein the liquid ammonia storage tank 21 is connected to the ammonia-air mixer 19 via the ammonia evaporator 20, and the first fan 22-1 is connected to the ammonia-air mixer 19. The flue gas is first mixed evenly with the dilute ammonia gas from the ammonia-air mixer 19, and then evenly distributed on the entire cross-section of the SCR reactor 16 through the second flow equalizing device 15-2. Ammonia and NO x A reduction reaction takes place on the surface of the catalyst layer 17, and the generated N 2 and H 2 O are discharged from the SCR reactor 16 along with the purified gas.

[0064] Specifically, in some examples, the air outlet of the desulfurization device II at the upper portion is connected to the air inlet of the denitrification device III at the lower portion, an air preheater 18 is provided at the front end of the air inlet of the denitrification device III at the lower portion, and the air outlet of the denitrification device III at the upper portion is connected to the chimney 23 via the second fan 22-2.

[0065] In some examples, the downhole filling system includes an ash tank 26, a slurry device 28 and a water tank 27 located on the ground, and also includes a downhole grouting system located underground, wherein the ash tank 26 and the water tank 27 are both connected to the slurry device 28, and the slurry device 28 is connected to the downhole grouting system through a conveying pipeline.

[0066] Specifically, in some examples, the underground grouting system includes a silo 29, a slurry tank 30 and a grouting pump 30 connected in sequence by pipelines. The slurry prepared on the ground is transported to the silo 29 along the pipeline. During grouting filling, the slurry and the curing agent are mixed in the slurry tank 30 in a ratio of 9:1 through automatic feeding by the system, and then filled into the goaf by a grouting pump 31. The curing agent is prepared by the underground grouting system and mixed with the slurry to form a grouting filling material, which can be automatically fed and the grouting speed can be adjusted according to the designed ratio.

[0067] On the other hand, Figure 1 , Figure 2 and Figure 3 As shown, the industrial smoke collection-purification-underground filling and utilization method described in the present invention comprises the following steps:

[0068] S1: using the negative pressure generated by the induced draft fan, i.e. the second fan (22-2), the industrial smoke generated by the boiler is sucked into the dust collection pipeline along the dust collecting hood 1, and introduced into the dust removal device after being cooled by the cooler (2), so that the solid dust is separated from the smoke, and the solid dust is collected in the dry ash conveying device 24 through the ash hopper 5 below;

[0069] S2: The exhaust gas from the dust removal device enters the flue gas purification system, where the gas is subjected to denitrification and desulfurization treatments in sequence. x After the content reaches the emission standard, it is directly discharged into the atmosphere;

[0070] S3: The dry ash accumulated in the dust removal device is cleaned by using a dust cleaning mechanism. The removed dry ash is dehydrated and stored in a ground ash bin and transported to an ash storage tank 25 in the mining area. The ash is mixed with water from a water storage tank 27 to form slurry and then pumped to the underground grouting system along a delivery pipeline.

[0071] S4: After the mortar is transported to the underground silo 29 along the pipeline, the slurry is pumped to the slurry storage tank 30 and mixed with the curing agent. After the grouting point is determined, the drilling is constructed and the grouting pipe is installed, and the grouting pump 31 is used to fill it into the goaf.

[0072] Specifically, in some examples, such as Figure 2 and Figure 3 As shown, the detailed steps of the industrial smoke collection, purification and underground filling utilization method described in the present invention are as follows:

[0073] 1) Open the pneumatic air valve of the induced draft fan (the second fan 22-2) to generate suction so that the industrial smoke and dust generated enters the dust collection pipeline along the dust collecting hood 1, and first passes through the pre-processor 3 for preliminary dust removal, and uses gravity sedimentation to remove large-size dust particles, which fall into the ash hopper 5 below and are collected in the dry ash conveying device 24;

[0074] 2) After the smoke enters the bag filter 9, it contacts the filter bag 10 under the traction of wind, and the coarse dust is isolated and falls into the ash hopper 5 below. The remaining fine particles enter the filter bag 10 and are adsorbed on the inner side of the filter bag 10. The separated smoke is discharged through the exhaust pipe;

[0075] 3) The flue gas enters from the bottom of the desulfurization reactor 14, is fully mixed and reacted with the desulfurizer sprayed by the air pump 13 through the first flow equalization device 15-1, and then the purified gas is discharged from the top;

[0076] 4) The flue gas is heated by the air preheater 18 and enters the denitration device, where it is mixed with the diluted ammonia gas sprayed from the ammonia supply system. The mixed gas is then evenly distributed on the catalyst layer 17 through the second flow equalizer 15-2. The gas that passes through the three catalyst layers is transported to the chimney 23 for discharge;

[0077] 5) The dust removal device and the flue gas purification device are connected to the dry ash conveying device 24 below. After the dust removal and purification are completed, the valve of the upper ash hopper 5 is opened, and the solid product is discharged by the spiral dust collector 25 on the device. The dry ash is dried and dehydrated and stored in the ground ash bin;

[0078] 6) The packaged dry ash is loaded onto a truck and transported to the grouting station in the mining area. The slurry making device 28 of the grouting station is used to mix the dry ash and water at a water-ash mass ratio of 0.7, and then transported to the underground silo 29 for storage through a pipeline. After the grouting point is determined, the valve is opened and the slurry is allowed to flow into the working face slurry storage tank 30 by its own weight. After the slurry is mixed with the curing agent, the grouting pump 30 is used to pump the slurry to the designated point to realize grouting filling of the underground goaf.

[0079] Specifically, in some examples, the bag filter 9 is provided with a total pressure difference and a chamber pressure difference device, which automatically monitors the resistance of the dust collector. When the resistance reaches the set value, the cleaning mechanism will automatically start the jet to remove the dust attached to the filter bag 10 in the bag filter 9. The resistance setting value is usually 1000-1500Pa. The bag filter 9 is equipped with an electric control cabinet, which is also provided with temperature display, air valve unloading and control functions. The cleaning mechanism is composed of a pulse valve 7, an air bag 6 and a blow pipe 8. The pulse valve 7 is connected to the blow pipe 8 and the air bag 6 respectively. After the pulse valve 7 is opened, the compressed air in the air bag 6 is ejected through the small hole of the blow pipe 8 to generate a high-speed airflow, so that the dust outside the filter bag 10 falls off to the ash hopper 5 below to achieve cleaning. The cleaning time is 0.15s and the blowing cycle is 30min. The filter material of the bag filter 9 is selected from polytetrafluoroethylene, which is a high-temperature resistant material. The box body is a steel structure and has a gap with the filter bag.

[0080] Specifically, in some examples, the air intake temperature of the bag filter 9 is 230°C-280°C. A thermometer is provided at the front end of the bag filter 9. When the temperature of the flue gas entering the filter is less than 230°C, the air mixing valve provided on the inlet pipe of the second fan 22-2 should be closed to reduce the total amount of flue gas and ensure an air intake temperature of 230°C. When the temperature of the flue gas entering the bag filter 9 is greater than 280°C, the air mixing valve provided on the inlet pipe of the second fan 22-2 should be opened to mix fresh air into the system, reduce the flue gas temperature, and allow the filter bag 10 to operate at a normal temperature.

[0081] Specifically, in some examples, the desulfurization device is composed of a powder bin 11, a grinder 12 and a reactor 14. Sodium bicarbonate stored in the powder bin 11 is used as a desulfurizer. After being ground, it is sprayed into the reactor 14 by wind power to react with SO2 to generate sodium sulfate and CO2, thereby achieving flue gas desulfurization.

[0082] Specifically, in some examples, the denitrification device is composed of an SCR reactor 16 and an ammonia supply system. The SCR reactor 16 is mainly composed of a catalyst layer 17 and a second flow equalizing device 15-2. The catalyst on the catalyst layer 17 is a vanadium-titanium catalyst, and the main component is TiO2 / V2O5. The ammonia supply system includes a liquid ammonia storage tank 21, an ammonia evaporator 20, an ammonia-air mixer 19 and ancillary facilities. The flue gas is first mixed evenly with the dilute ammonia gas injected from the ammonia-air mixer 19 through the ammonia injection device, and then evenly distributed on the entire cross-section of the SCR reactor 16 through the second flow equalizing device 15-2. Ammonia and NO x A reduction reaction takes place on the surface of the catalyst layer 17, and the generated N2 and H2O are discharged from the reactor along with the purified gas.

[0083] Specifically, in some examples, before mixing ammonia and air, the ammonia supply system uses the first fan 22-1 to provide air to dilute the ammonia gas according to a volume ratio of ammonia:air = 1:20; the ammonia gas is prepared by an ammonia evaporator 20, and the liquid ammonia is indirectly heated by a water heat medium and converted into a gaseous state at a pressure of 1.5MPa.

[0084] Specifically, in some examples, the interior of the ash hopper 5 below the dust collector is smooth and flat, the angle between the inclined wall of the ash hopper 5 and the horizontal plane is 60°, and the inner side of the intersection angle of adjacent walls of the dust collector ash hopper 5 is arc-shaped, and the radius of the arc is 200 mm.

[0085] Specifically, in some examples, the curing agent includes an activator, a leveling agent, a stabilizer and an accelerating setting agent. Other curing agents may also be used, all within the scope of protection of the present invention, and the present invention does not limit them. The activator is a water glass-NaOH composite activator, the leveling agent is a ZW-S06 dispersant, the stabilizer is a Wenlun glue, the accelerating setting agent is a liquid alkali-free accelerating setting agent, and the curing agent and the mortar are mixed in a mass ratio of 1:9.

[0086] The industrial smoke collection-purification system of the present invention is equipped with a pressure sensor, a temperature sensor and an air flow meter to monitor the gas conditions inside the device and the pipeline in real time, and adjust the fan air volume in time when the warning value is reached.

[0087] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An industrial smoke collection-purification-downhole filling device, characterized in that: It comprises a dust removal device (I), a flue gas purification system, a dry ash conveying device (24) and an underground filling system, wherein the air outlet of the dust removal device (I) is connected to the air inlet of the flue gas purification system, the lower parts of the dust removal device (I) and the flue gas purification system are both provided with an ash hopper (5), the ash hopper (5) is connected to the dry ash conveying device (24), and the dry ash in the dry ash conveying device (24) is collected and stored in an ash storage tank (26) of the underground filling system; wherein, The dust removal device (I) comprises a pre-processor (3) and a bag dust collector (9), wherein the front end of the smoke inlet of the pre-processor (3) is connected to a dust collecting hood (1) and a cooler (2) in sequence, and vertical baffles (4) are arranged at intervals at the upper and lower parts of the pre-processor (3); the bag dust collector (9) has a plurality of vertical filter bags (10), and a cleaning mechanism is arranged above the filter bags (10), and the cleaning mechanism comprises an air bag (6), a pulse valve (7), and a blow pipe (8); the blow pipe (8) is arranged horizontally above the filter bag (10), and has a plurality of air outlet holes corresponding to the filter bags below; the air inlet end of the blow pipe (8) is located outside the bag dust collector (9) and is connected to the pulse valve (7) and the air bag (6); The flue gas purification system comprises a desulfurization device (II) and a denitrification device (III) which are connected in sequence, and the air outlet of the bag filter (9) is connected to the air inlet of the desulfurization device (II) at the bottom.

2. The device according to claim 1, characterized in that The interior of the ash hopper (5) is smooth and flat, and the angle between the inclined wall of the ash hopper (5) and the horizontal plane is not less than 60°; and / or Preferably, the inner side of the intersection angle of adjacent walls of the ash hopper (5) is in an arc shape, and the arc radius is 200 mm; and / or Preferably, an ash discharge valve is provided at the connection between the ash hopper (5) and the dry ash conveying device (24) below, and dry ash falls into the dry ash conveying device (24) after the valve of the ash discharge valve is opened.

3. The device according to claim 1, characterized in that The bag filter (9) has filter material therein, and the filter material includes polytetrafluoroethylene; Preferably, the outer box body of the bag filter (9) is a steel structure, and the outer box body and the filter bag (10) are fitted with a clearance; Preferably, the bag filter (9) is provided with a pressure difference monitoring device for automatically monitoring the resistance in the bag filter (9), and the pressure difference monitoring device is connected to the dust cleaning mechanism signal; Preferably, the pressure difference monitoring device includes a total pressure difference monitoring device and a chamber pressure difference monitoring device.

4. The device according to claim 1, characterized in that The pre-processor (3) is used to capture coarse particles larger than 10 to 20 μm, and the adjacent baffles (4) have the same spacing; When dealing with smoke of different concentrations and particle sizes, the baffle spacing and baffle height need to be adjusted to meet the dust removal efficiency η≥70%, where the calculation formula for the dust removal efficiency η is as follows: Where ρ is the dust density, kg / m 3 ; d is the average particle size of dust particles, m; v is the air flow velocity, m / s; n is the number of baffles, μ is the dynamic viscosity, Pa·s; H is the baffle height, m.

5. The device according to claim 1, characterized in that The desulfurization device (II) comprises a desulfurization reactor (14), the powder bin (11) stores a desulfurizer and is connected to a powder inlet at the bottom of the desulfurization reactor (14) via an air pump (13), a first flow equalizing device (15-1) is provided inside the desulfurization reactor (14), and the first flow equalizing device (15-1) is located above the air inlet and the powder inlet of the desulfurization reactor (14); Preferably, the desulfurizing agent comprises sodium bicarbonate; Preferably, a grinder (12) is provided between the powder bin (11) and the air pump (13).

6. The device according to claim 1, characterized in that The denitration device (III) comprises an SCR reactor (16) and an ammonia supply system, wherein an air inlet and an ammonia inlet are respectively arranged at the lower part of the SCR reactor (16), and a second flow equalizing device (15-2) and at least one catalyst layer (17) are arranged in sequence at the upper part; The ammonia supply system comprises a liquid ammonia storage tank (21), an ammonia evaporator (20), an ammonia-air mixer (19) and a first fan (22-1), wherein the liquid ammonia storage tank (21) is connected to the ammonia-air mixer (19) via the ammonia evaporator (20), and the first fan (22-1) is connected to the ammonia-air mixer (19).

7. The device according to claim 1, characterized in that The gas outlet of the desulfurization device (II) at the upper part is connected to the gas inlet of the denitration device (III) at the lower part; Preferably, an air preheater (18) is provided at the front end of the air inlet located at the lower part of the denitration device (III); and / or Preferably, the air outlet of the denitration device (III) located at the top is connected to the chimney (23) via the second fan (22-2).

8. The device according to claim 1, characterized in that The downhole filling system comprises an ash storage tank (26), a slurry making device (28) and a water storage tank (27) located on the ground, and also comprises a downhole grouting system located in the well, wherein the ash storage tank (26) and the water storage tank (27) are both connected to the slurry making device (28), and the slurry making device (28) is connected to the downhole grouting system via a conveying pipeline; Preferably, the downhole grouting system comprises a silo (29), a slurry storage tank (30) and a grouting pump (31) which are sequentially connected by pipelines.

9. A method for collecting, purifying and filling industrial smoke underground, characterized in that: Using the device as described in any one of claims 1 to 8, the method comprises the following steps: S1: Industrial smoke enters the dust collection pipeline along the dust collection hood (1), is cooled by the cooler (2), and is introduced into the dust removal device in sequence to separate the solid dust from the smoke. The solid dust is collected in the dry ash conveying device (24) through the ash hopper (5) below; S2: The flue gas discharged from the dust removal device (I) enters the flue gas purification system, and the gas is desulfurized and denitrified in turn. x After the content reaches the emission standard, it is directly discharged into the atmosphere; S3: using a dust cleaning mechanism to clean the dry dust accumulated in the dust removal device, the removed solid dust is dried and dehydrated, and then stored in a ground ash bin and transported to an ash storage tank (26) in the mining area, and then mixed into slurry in a slurry making device (28) and pumped to an underground grouting system along a conveying pipeline; S4: After the mortar is transported to the underground silo (29) along the pipeline, the slurry is pumped to the slurry storage tank (30) and mixed with a curing agent. After the grouting point is determined, a hole is drilled and a grouting pipe is installed, and the grouting is filled into the goaf using a grouting pump (31).

10. The method according to claim 9, characterized in that The curing agent includes an activator, a leveling agent, a stabilizer and an accelerating agent, and the curing agent and the mortar are mixed in a mass ratio of 1:9; Preferably, the ammonia supply system of the denitration device dilutes the ammonia gas at a volume ratio of 1:20; The air inlet temperature of the bag filter (9) is 230°C-280°C; Preferably, the inlet temperature of the bag filter (9) is controlled by regulating the second fan (22-2) at the air outlet of the flue gas purification system; Preferably, the air mixing valve on the inlet duct of the second fan (22-2) is closed to reduce the total amount of smoke to increase the intake air temperature; the air mixing valve on the inlet duct of the second fan (22-2) is opened to mix fresh air into the system to reduce the intake air temperature.

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