Flue gas collecting device for low-rank coal pyrolysis

Abstract

The invention relates to the technical field of low-rank coal treatment and processing, and particularly discloses a flue gas collecting device for low-rank coal pyrolysis, the flue gas collecting device comprises a flue gas collecting box for collecting flue gas, a ventilation pipeline is mounted and connected between one end, close to the top, of one side of the flue gas collecting box and a flue chamber, and a gas outlet pipeline is mounted at the other end of the flue gas collecting box; an exhaust assembly is further installed at the end, away from the smoke collecting box, of the gas outlet pipeline, a spraying assembly used for conducting dust falling on smoke entering the smoke collecting box is installed at the inner top of the smoke collecting box, and a drainage pipeline used for discharging sewage generated by spraying the smoke out of the smoke collecting box is further installed at the bottom end of the smoke collecting box; an oil sludge filter membrane located between the lower portion of the spraying assembly and the drainage pipeline is further installed in the smoke collecting box, and the problem that in traditional low-rank coal processing, flue gas is directly subjected to spraying dust falling treatment, oil sludge generated during flue gas dust falling cannot be recycled, and waste of resources contained in the flue gas is caused is solved.

Description

Technical Field

[0001] The present application relates to the technical field of low-rank coal processing and treatment, and specifically discloses a flue gas collection device for pyrolysis of low-rank coal. Background Art

[0002] Low-rank coal is a type of coal that has a long flame and smoke when burning and has a low degree of coalification. Its appearance is gray-black to black, and the powder ranges from brown to black. This type of coal has a carbon content of 75% to 90%, does not contain free humic acid, and most of it is adhesive, has a high calorific value, and most of it can coke.

[0003] During the pyrolysis process of low-rank coal, a large amount of flue gas is often generated inside the flue chamber. The flue gas accumulates in the flue chamber, which not only affects the processing environment, but also contains a large amount of pyrolysis by-products. If it is directly discharged into the environment, it will also cause environmental pollution. At present, the flue gas is usually treated by spraying dust reduction, but the sludge generated after the flue gas dust reduction cannot be collected, resulting in a waste of resources. Therefore, in view of this, the inventor provides a flue gas collection device for low-rank coal pyrolysis to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the flue gas generated by traditional low-rank coal processing is directly treated by spraying dust reduction, and the oil sludge generated during the dust reduction of the flue gas is not recovered, resulting in waste of resources contained in the flue gas.

[0005] In order to achieve the above-mentioned purpose, the basic scheme of the present invention provides a flue gas collection device for low-rank coal pyrolysis, including a smoke collecting box for collecting smoke, a ventilation duct is installed and connected between one end of the smoke collecting box close to the top and the flue chamber, an exhaust duct is installed at the other end of the smoke collecting box, and an exhaust assembly is also installed at the end of the exhaust duct away from the smoke collecting box, a spray assembly for reducing dust on the smoke entering the smoke collecting box is installed at the inner top of the smoke collecting box, a drainage pipe for discharging sewage generated by the spraying smoke from the smoke collecting box is also installed at the bottom of the smoke collecting box, and an oil sludge filter membrane is also installed in the smoke collecting box between the bottom of the spray assembly and the drainage pipe.

[0006] The principles and effects of this basic solution are: 1. Compared with the prior art, the present invention is provided with a ventilation duct, an exhaust duct and an exhaust assembly. The ventilation duct and the smoke collecting box are used to collect and discharge the smoke in the flue chamber, thereby preventing the smoke from affecting the operation of the processing environment of the low-rank coal pyrolysis. By setting a spray assembly in the smoke collecting box, it is convenient to carry out dust reduction treatment on the smoke, thereby achieving the purpose of separating the impurities in the smoke into gas and oil sludge solids. Then, the exhaust duct and the exhaust assembly are used to pump and discharge the gas after the spray treatment in the smoke collecting box, thereby adjusting the smoke in the smoke collecting box. The gas pressure in the part is reduced by setting up an oil sludge filter membrane, which makes it easy to filter and collect the oil sludge mixed in the sewage generated by spraying, avoiding the waste of oil sludge caused by the discharge of oil sludge along with the sewage, thereby facilitating the collection and reuse of oil sludge, and at the same time reducing the separation and extraction of useful substances from the sewage generated by spraying, reducing the workload of subsequent processing, and solving the problem that the flue gas generated by traditional low-grade coal processing is directly treated by spraying dust reduction, and the oil sludge generated during flue gas dust reduction cannot be recovered, resulting in waste of resources in the flue gas.

[0007] Furthermore, the spray assembly includes a spray pipe arranged at the inner top of the smoke collecting box and a water supply pipe installed at the top of the smoke collecting box and connected to the spray pipe, a booster water valve is installed on the water supply pipe, and a water supply tank is also connected to the end of the water supply pipe away from the smoke collecting box. By setting the spray pipe, the smoke entering the smoke collecting box from the ventilation pipe is sprayed to reduce dust, which is convenient for converting the smoke into gas and sewage containing solid impurities, thereby facilitating the separation and collection of usable substances in the smoke, and providing sufficient spray water for the spray pipe through the water supply tank, the booster water valve and the water supply pipe.

[0008] Furthermore, the exhaust assembly includes an exhaust fan installed at the outlet end of the exhaust duct and a controller for adjusting the wind speed of the exhaust fan. By setting the exhaust fan and the controller, it is convenient to adjust the exhaust wind speed according to the density of the smoke, so as to achieve a better spraying effect.

[0009] Furthermore, a number of supporting rollers for lifting the bottom of the oil sludge filter membrane are evenly connected and rotated between the inner sides of the smoke collecting box, a driving motor for driving any supporting roller to rotate is installed on the outer side of the smoke collecting box, and a chain transmission assembly for driving all supporting rollers to rotate synchronously is also installed on the outer side of the smoke collecting box. By setting supporting rollers to support the oil sludge filter membrane and setting a driving motor and a chain transmission assembly to drive the supporting rollers to rotate, it is not only convenient to reduce the load pressure of the oil sludge filter membrane on the surface oil sludge, but also convenient to roll and guide the oil sludge filter membrane and the surface oil sludge, so that sewage can pass through the oil sludge filter membrane more conveniently and be discharged from the smoke collecting box through the drainage pipe.

[0010] Furthermore, the chain drive assembly includes a driving sprocket coaxially connected to the output end of the driving motor, a plurality of driven sprockets coaxially connected to the ends of each supporting roller, and a transmission chain meshedly connected between the driving sprocket and each driven sprocket. By providing the driving sprocket, the driven sprocket and the transmission chain, it is convenient to uniformly drive all the supporting rollers. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 A schematic structural diagram of a flue gas collection device for low-rank coal pyrolysis proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0013] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0014] The reference numerals in the drawings of the specification include: smoke collecting box 1, ventilation duct 2, exhaust duct 3, drainage duct 4, sludge filter membrane 5, spray pipe 6, water supply pipe 7, booster water valve 8, exhaust fan 9, support roller 10, driving sprocket 11, driven sprocket 12, and transmission chain 13.

[0015] A flue gas collection device for low-rank coal pyrolysis, for example Figure 1 As shown: it includes a smoke collecting box 1 for collecting smoke, a ventilation pipe 2 is installed and connected between the left end of the smoke collecting box 1 near the top and the flue chamber, an exhaust pipe 3 is installed at the right end of the smoke collecting box 1, and an exhaust assembly is also installed at the end of the exhaust pipe 3 away from the smoke collecting box 1, a spray assembly for reducing dust on the smoke entering the smoke collecting box 1 is installed at the inner top of the smoke collecting box 1, and a drainage pipe 4 for discharging sewage generated by the spraying smoke from the smoke collecting box 1 is also installed at the bottom of the smoke collecting box 1, and an oil sludge filter membrane 5 is also installed in the smoke collecting box 1 and is located between the bottom of the spray assembly and the drainage pipe 4, wherein the oil sludge filter membrane 5 includes but is not limited to a structure using a membrane cloth that can filter liquid water.

[0016] Among them, Figure 1 As shown, the spray assembly includes a spray pipe 6 arranged at the inner top of the smoke collecting box 1 and a water supply pipe 7 installed on the top of the smoke collecting box 1 and connected to the spray pipe 6. A booster water valve 8 is installed on the water supply pipe 7. The end of the water supply pipe 7 away from the smoke collecting box 1 is also connected to a water supply tank.

[0017] Among them, Figure 1 As shown, the exhaust assembly includes an exhaust fan 9 installed at the outlet end of the exhaust duct 3 and a controller for adjusting the wind speed of the exhaust fan 9, and the controller includes but is not limited to a PLC controller.

[0018] Among them, Figure 1 As shown, six supporting rollers 10 for lifting the bottom of the sludge filter membrane 5 are evenly connected and rotated between the inner sides of the smoke collecting box 1, a driving motor for driving the leftmost supporting roller 10 of the smoke collecting box 1 to rotate is installed on the rear side of the smoke collecting box 1, and a chain transmission assembly for driving all supporting rollers 10 to rotate synchronously is also installed on the rear side of the smoke collecting box 1.

[0019] Among them, Figure 1 As shown, the chain drive assembly includes a driving sprocket 11 coaxially connected to the output end of the driving motor, five driven sprockets 12 coaxially connected to the ends of each supporting roller 10, and a transmission chain 13 meshingly connected between the driving sprocket 11 and each driven sprocket 12.

[0020] In the specific implementation process of the present invention, the booster water valve 8 is first opened, and the water in the water supply tank is pressurized and passed into the smoke collecting box 1 through the water supply pipe 7 and the spray pipe 6, and the spraying operation is started. The exhaust fan 9 is turned on by the controller. If the smoke density in the flue chamber is large, the controller controls and adjusts to increase the wind speed of the exhaust fan 9, otherwise it reduces the wind speed of the exhaust fan 9. After the exhaust fan 9 is turned on, the smoke enters the smoke collecting box 1 with the flow of air and flows through the bottom of the spray pipe 6 to merge with the spray water. Then, the gas in the smoke is discharged from the outlet pipe 3 with the wind direction of the exhaust fan 9. The solid impurities in the smoke merge with the spray water to form sewage that falls into the bottom of the smoke collecting box 1 and flows through the sludge filter membrane 5. The sludge in the sewage is filtered on the sludge filter membrane 5, and the sewage passes through the sludge filter membrane 5 and falls to the bottom of the smoke collecting box 1. Finally, it is discharged through the drainage pipe 4, completing the collection of smoke and the recovery of impurities. During this process, the driving motor and the chain transmission assembly drive the supporting roller 10 to rotate, so as to support and roll the oil sludge filter membrane 5, thereby causing the oil sludge filter membrane 5 to form a wave-like moving state.

[0021] Compared with the prior art, the present invention is provided with a ventilation duct 2, an exhaust duct 3 and an exhaust assembly. The ventilation duct 2 and the smoke collecting box 1 are used to collect and discharge the smoke in the flue chamber, thereby preventing the smoke from affecting the operation of the processing environment for pyrolysis of low-rank coal. By providing a spray assembly in the smoke collecting box 1, it is convenient to carry out dust reduction treatment on the smoke, thereby achieving the purpose of separating impurities in the smoke into gas and sludge solids. The exhaust duct 3 and the exhaust assembly are then used to pump and discharge the gas after spraying treatment in the smoke collecting box 1, thereby adjusting the smoke collecting box. 1, by setting the oil sludge filter membrane 5, it is convenient to filter and collect the oil sludge mixed in the sewage generated by the spraying, so as to avoid the waste of oil sludge caused by the discharge of oil sludge along with the sewage, thereby facilitating the collection and reprocessing of the oil sludge, and at the same time reducing the separation and extraction of useful substances from the sewage generated by the spraying, reducing the workload of subsequent processing, and solving the problem that the flue gas generated by the traditional low-rank coal processing is directly treated by spraying dust reduction, and the oil sludge generated during the dust reduction of the flue gas is not recovered, resulting in the waste of resources contained in the flue gas.

[0022] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A flue gas collection device for low-rank coal pyrolysis, characterized in that: It comprises a smoke collecting box for collecting smoke, wherein a ventilation pipe is installed and connected between one end of the smoke collecting box near the top and the flue chamber, an air outlet pipe is installed at the other end of the smoke collecting box, and an exhaust assembly is also installed at the end of the air outlet pipe away from the smoke collecting box, a spray assembly for reducing dust on the smoke entering the smoke collecting box is installed at the inner top of the smoke collecting box, a drainage pipe for discharging sewage generated by the spraying smoke out of the smoke collecting box is also installed at the bottom of the smoke collecting box, and an oil sludge filter membrane is also installed in the smoke collecting box and located between the bottom of the spray assembly and the drainage pipe.

2. A flue gas collection device for low-rank coal pyrolysis according to claim 1, characterized in that: The spray assembly includes a spray pipe arranged on the inner top of the smoke collecting box and a water supply pipe installed on the top of the smoke collecting box and connected to the spray pipe. A booster water valve is installed on the water supply pipe, and one end of the water supply pipe away from the smoke collecting box is also connected to a water supply tank.

3. A flue gas collection device for low-rank coal pyrolysis according to claim 2, characterized in that: The exhaust assembly includes an exhaust fan installed at the outlet end of the exhaust duct and a controller for adjusting the wind speed of the exhaust fan.

4. A flue gas collection device for low-rank coal pyrolysis according to claim 3, characterized in that: A plurality of supporting rollers for lifting the bottom of the sludge filter membrane are evenly connected to the inner side of the smoke collecting box, a driving motor for driving any supporting roller to rotate is installed on the outer side of the smoke collecting box, and a chain transmission assembly for driving all supporting rollers to rotate synchronously is also installed on the outer side of the smoke collecting box.

5. A flue gas collection device for low-rank coal pyrolysis according to claim 4, characterized in that: The chain transmission assembly comprises a driving sprocket coaxially connected to the output end of the driving motor, a plurality of driven sprockets coaxially connected to the ends of each supporting roller, and a transmission chain meshingly connected between the driving sprocket and each driven sprocket.

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