A desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying system and a pneumatic conveying method

Abstract

The application relates to the dust removal field, in particular to a desulfurization and denitration integrated dust removal desulfurization and lime powder pneumatic conveying system and a pneumatic conveying method. The technical scheme of the application adopts a segmented control boosting mode, all external side-by-side dense phase boosting devices do not need to be opened at the same time for full-time spraying boosting each time; each time boosting spraying is not continuous opening spraying, but spraying and flow interference boosting are carried out in a certain interval section of the ash conveying pipeline according to certain interval time and spraying time. 1. The number of mechanical equipment and the maintenance amount of the mechanical equipment are reduced; the reliability and stability of the desulfurization and denitration integrated dust removal desulfurization and lime powder pneumatic conveying system operation are effectively improved, and the positive pressure static pressure dense phase pneumatic conveying system is more energy-saving compared with a traditional configuration of external side-by-side dense phase boosting devices.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dust removal, in particular to a desulfurization and denitrification integrated dust removal desulfurization and lime powder pneumatic conveying system and a pneumatic conveying method. BACKGROUND

[0002] The circulating fluidized bed flue gas semi-dry desulfurization process is based on the principle of circulating fluidized bed, uses dry lime powder Ca(OH)2 as absorbent, prolongs the contact time of absorbent and flue gas in the desulfurization tower through multiple recirculation of the absorbent, so as to achieve the purpose of high-efficiency desulfurization, and greatly improves the utilization rate of the absorbent. Through chemical reaction, SO2, SO3, HF and HCL and other acid gases in the flue gas can be effectively removed, the desulfurization end product desulfurization lime powder mixture is a free-flowing dry powder mixture without secondary pollution, and can be further utilized. The process is mainly applied to flue gas desulfurization of power plant boilers, and a single tower can process flue gas of a boiler with an evaporation capacity of 75t / h to 1025t / h, the SO2 removal rate can reach 90% to 98%, and it is a method with the largest single tower processing capacity and the most optimal desulfurization comprehensive benefit among the dry, semi-dry and other desulfurization technologies.

[0003] In order to prevent secondary pollution, more and more enterprises use pneumatic conveying process to convey the desulfurization end product desulfurization lime powder mixture to a relatively far central ash storage, and then transport it out for comprehensive utilization.

[0004] There are certain difficulties in conveying the desulfurization lime powder by using the pneumatic conveying process, that is, because the desulfurization lime powder to be conveyed has high temperature and high humidity, the pneumatic conveying system is very unstable when conveying by using the conventional pneumatic ash conveying process, and is prone to pipe blockage and long conveying period, or no matter whether the system is conveying or not, compressed gas is continuously injected into the ash conveying pipeline at certain intervals to disturb the flow and provide thrust, which wastes energy consumption. SUMMARY

[0005] Based on the problems existing in the above-mentioned desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying special working condition, the present application is proposed and completed.

[0006] The purpose of the present application is to provide a desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying system.

[0007] The further purpose of the present application is to provide a method for pneumatic conveying by using the above-mentioned desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying system.

[0008] The desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying system according to the present application comprises a compressed air storage tank, a dust collector ash bucket, a buffer hopper, a bin pump, a central ash storage and a PLC control device, wherein,

[0009] The dust collector ash hopper, buffer hopper and warehouse pump are sequentially communicated.

[0010] The buffer hopper is provided with a vibrating crushing and screening device.

[0011] The warehouse pump and the central ash storage are communicated through an ash conveying pipeline.

[0012] Segmented external pulse type dense phase boosting devices are arranged on the ash conveying pipeline at intervals.

[0013] The compressed air provided by the compressed air storage tank is partially directly introduced into the ash conveying pipeline through the warehouse pump, and the other part is introduced into a boosting air source pipeline through the segmented external pulse type dense phase boosting devices and then introduced into the ash conveying pipeline, wherein the boosting air source pipeline and the ash conveying pipeline are communicated through a pipeline.

[0014] The segmented external pulse type dense phase boosting devices include a pressure sensor arranged on the ash conveying pipeline and an electromagnetic pulse valve arranged on the pipeline through which the boosting air source pipeline and the ash conveying pipeline are communicated.

[0015] The electromagnetic pulse valve is controlled by a pulse signal to control the opening or closing of pulse air blowing into the ash conveying pipeline.

[0016] The pressure sensor detects the pressure in the ash conveying pipeline in real time, and determines whether to open the electromagnetic pulse valve of the external pulse type dense phase boosting device in the corresponding section to perform pulse air blowing into the ash conveying pipeline through logical judgment of a program set by the PLC control device.

[0017] According to the desulfurization and denitrification integrated dust removal and desulfurization lime powder pneumatic conveying system, fluidized drying type cut-out air conveying chutes and fluidized drying type collection air conveying chutes are arranged at the lower end of the dust collector ash hopper.

[0018] According to the desulfurization and denitrification integrated dust removal and desulfurization lime powder pneumatic conveying system, a material level meter and a temperature meter are arranged in the buffer hopper.

[0019] According to the desulfurization and denitrification integrated dust removal and desulfurization lime powder pneumatic conveying system, a discharger and a powder material crusher are sequentially arranged at the outlet of the buffer hopper.

[0020] According to the desulfurization and denitrification integrated dust removal and desulfurization lime powder pneumatic conveying system, the fluidized drying type cut-out air conveying chutes, the fluidized drying type collection air conveying chutes, the buffer hopper, the warehouse pump, the ash conveying pipeline and the compressed air storage tank are provided with heat tracing devices.

[0021] According to the desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying system of the application, the segmented external pulse type dense phase boosting device is arranged at intervals of 50-80 m along the ash conveying pipeline.

[0022] According to the desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying system of the application, a plurality of groups of injection valves are arranged on the boosting gas source pipeline, each injection valve is communicated with the ash conveying pipeline through a hose, and a throttle orifice plate and an anti-fouling check valve are arranged at the communication position of the hose and the ash conveying pipeline.

[0023] According to the method for pneumatic conveying using the above desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying system, the method comprises the following steps:

[0024] When the feed of the bin pump reaches the set level, the feed of the bin pump is stopped, and then the compressed air provided by the compressed air storage tank is conveyed to the bin pump and enters the ash conveying pipeline;

[0025] Another part of the compressed air of the compressed air storage tank is conveyed to the ash conveying pipeline through the segmented external pulse type dense phase boosting device, wherein,

[0026] Each pressure sensor arranged on the ash conveying pipeline detects the pressure value in the section of the ash conveying pipeline in real time, and the PLC control device compares the pressure values detected by all the pressure sensors on the ash conveying pipeline in real time, such as P1-P N >P N+1 , and P1-P N ≥ 0.2-0.22 MPa, the electromagnetic pulse valve of the segmented external pulse type dense phase boosting device in the section is started, the compressed conveying gas is injected into the ash conveying pipeline, and the flow boosting is performed, wherein P1 is the pressure value in the ash conveying pipeline detected by the first pressure transmitter arranged close to the outlet of the bin pump, P N is the pressure value in the ash conveying pipeline detected by the Nth pressure transmitter arranged away from the outlet of the bin pump, and P N+1 is the pressure value in the ash conveying pipeline detected by the N+1th pressure transmitter arranged away from the outlet of the bin pump.

[0027] The desulfurization lime powder mixture is conveyed to the central ash storage through the ash conveying pipeline.

[0028] According to the method of the application, the opening time of the electromagnetic pulse valve is 300-500 ms.

[0029] According to the method of the application, the fluidized drying type cutting air conveying chute, the fluidized drying type collection air conveying chute, the buffer hopper, the bin pump, the ash conveying pipeline and the compressed air storage tank are heat traced and insulated.

[0030] The technical solution of the present application is different from the prior art in that:

[0031] (1) The segmented control boosting mode is adopted, and all the external side-by-side dense phase boosting devices do not need to be opened at the same time for each time of opening the jet boosting;

[0032] (2) Each time of boosting jet is not continuous opening jet, but jet is performed to a certain interval section of the ash conveying pipeline at a certain interval time and jet time.

[0033] Beneficial effects:

[0034] 1. The number of mechanical equipment and the amount of mechanical equipment maintenance are reduced;

[0035] 2. The reliability and stability of the desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying system are effectively improved, and the system is more energy-saving compared with the traditional positive pressure static pressure dense phase pneumatic conveying system with external side-by-side dense phase boosting device. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a structural schematic view of the desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying system of the present application;

[0037] Figure 2 is a structural schematic view of the segmented external side-by-side pulse type dense phase boosting device of the blast furnace stock bin dust ash pneumatic conveying system according to the present application.

[0038] REFERENCE SIGNS:

[0039] 1: dust collector hopper; 2: fluidized drying type cut-out air conveying chute; 3: fluidized drying type collection air conveying chute; 4: pneumatic plug valve; 5: level meter; 6: temperature meter; 7: buffer hopper; 8: vibrating crushing and screening device; 9: fluidized boosting device; 10: pneumatic feeding valve; 11: pneumatic exhaust valve; 12: bin pump; 13: fluidized boosting type sender; 14: discharge valve; 15: segmented external side-by-side pulse type boosting device; 16: pressure sensor; 17: pipeline type dense phase booster; 18: ash conveying pipeline; 19: conveying gas source valve group; 20: conveying gas source heating device; 21: PLC control device; 22: compressed air storage tank 22; 23: central ash storage; 24: unloader; 25: powder material pulverizer; 26: boosting gas source pipeline;

[0040] I: jet valve group;

[0041] 15-1: right-angle type electromagnetic pulse valve; 15-2: short pipe; 15-3: hose 15-3; 15-4: orifice plate; 15-5: anti-fouling check valve. DETAILED DESCRIPTION

[0042] The desulfurization and denitrification integrated dust removal desulfurization lime powder pneumatic conveying system according to the application comprises a compressed air storage tank, a dust collector hopper, a buffer hopper, a bin pump, a central ash storage and a PLC control device, wherein,

[0043] The dust collector hopper, the buffer hopper and the bin pump are sequentially communicated;

[0044] The buffer hopper is provided with a vibrating crushing and screening device;

[0045] The bin pump and the central ash storage are communicated through an ash conveying pipeline;

[0046] Segmented external pulse type dense phase boosting devices are arranged on the ash conveying pipeline at intervals;

[0047] The compressed air provided by the compressed air storage tank is partially directly introduced into the ash conveying pipeline through the bin pump, and the other part is introduced into a boosting air source pipeline through the segmented external pulse type dense phase boosting devices and then into the ash conveying pipeline, wherein the boosting air source pipeline and the ash conveying pipeline are communicated through a pipeline;

[0048] The segmented external pulse type dense phase boosting devices comprise a pressure sensor arranged on the ash conveying pipeline and an electromagnetic pulse valve arranged on the pipeline through which the boosting air source pipeline and the ash conveying pipeline are communicated, wherein,

[0049] The electromagnetic pulse valve is controlled by a pulse signal to control the opening or closing of pulse blowing into the ash conveying pipeline,

[0050] The pressure sensor detects the pressure in the ash conveying pipeline in real time, and determines whether to open the electromagnetic pulse valve of the external pulse type dense phase boosting device in the corresponding section to perform pulse blowing into the ash conveying pipeline through logical judgment of the program set by the PLC control device.

[0051] Fluidized drying type cut-out air conveying chutes and fluidized drying type collection air conveying chutes are arranged below the dust collector hopper to convey the ash in each hopper of the desulfurization and denitrification integrated dust collector into the buffer hopper.

[0052] The buffer hopper is provided with a material level meter and a temperature meter to detect the material level of the desulfurization lime powder mixture in the buffer hopper and the wall temperature of the buffer hopper taking heat preservation measures and fluidization boosting in real time, determine the start / stop of the pneumatic conveying system according to the material level data of the desulfurization lime powder mixture, determine the start / stop of the heat tracing device according to the wall temperature of the buffer hopper taking heat preservation measures and fluidization boosting, and prevent the desulfurization lime powder mixture with certain temperature and humidity from condensing and sticking in the buffer hopper.

[0053] The heat preservation measures are taken and the vibration breaking and screening device is arranged in the fluidization boost buffer hopper to break and screen the agglomerates of the desulfurization and lime powder mixture in the buffer hopper, and to filter and block foreign matters, so as to avoid the problems of pipe blockage and poor ash conveying caused by the foreign matters entering the pneumatic conveying system.

[0054] The discharger and the powder material pulverizer are arranged in sequence at the ash discharging port of the lower part of the buffer hopper, for effectively pulverizing the powder material entering the bin pump again, so as to ensure the stable and reliable operation of the pneumatic conveying system.

[0055] The heat preservation (i.e. electric heat tracing or steam heat tracing) devices are arranged in the entire desulfurization and denitration integrated dust removal desulfurization and lime powder pneumatic conveying system, including the fluidization drying type cut-out air conveying chute, the fluidization drying type collection air conveying chute, the buffer hopper, the bin pump tank body and the ash conveying pipeline, the conveying air source heating device can adopt the electric heating or steam heating mode to effectively heat the compressed air source for conveying the desulfurization and lime powder mixture in real time, so as to avoid the problems of condensation and adhesion caused by the desulfurization and lime powder mixture with certain temperature and humidity in the pneumatic conveying process, to ensure the stable and reliable operation of the desulfurization and denitration integrated dust removal desulfurization and lime powder pneumatic conveying system.

[0056] The segmented external pulse type dense phase boost devices are arranged along the ash conveying pipeline at intervals of 50-80 m, and the number of the devices is selected according to the total length of the ash conveying pipeline of each set of pneumatic conveying system.

[0057] A plurality of injection valves are arranged on the boost air source pipeline, each injection valve is communicated with the ash conveying pipeline through a hose, and a throttle orifice plate and an anti-fouling check valve are arranged at the communication position of the hose and the ash conveying pipeline.

[0058] Any segmented external pulse type dense phase boost device can detect the pressure condition in the region of the ash conveying pipeline according to the pressure sensor arranged in the region, if the pressure of the ash conveying pipeline rises and the pressure value is ≥0.2-0.22 MPa, the program set by the control system is used for logical judgment, wherein, the pressure values detected by all the pressure sensors on the ash conveying pipeline are compared, and it is judged in real time which region of the ash conveying pipeline has the trend of pipe blockage, i.e. (P1-P N )>P N+1 , (P1-P N)≥0.2~0.22MPa, immediately open the electromagnetic pulse valve of the set of sectional external pulse type dense phase boosting device to spray compressed nitrogen into the ash conveying pipeline to perform turbulence boosting (or called blockage breaking). The electromagnetic pulse valve is not continuously opened, but is controlled by pulse signals according to the set opening and closing time (300-500 ms) to perform pulse dense phase boosting to perform pulse blowing to the sectional ash conveying pipeline to perform turbulence boosting. Each time only the set of sectional external pulse type dense phase boosting device closest to the region with the tendency of pipe blockage is opened, and the other sectional external pulse type dense phase boosting devices before and after it are not opened, so that the system dense phase static pressure conveying state can be ensured to be stable, and the conveying gas consumption can be saved to the maximum extent.

[0059] The realization of dense phase conveying and the prevention of pipe blockage are a pair of contradictions which are interrelated and mutually restricted. The traditional dense phase static pressure pneumatic conveying system usually adds all the conveying gas into the silo pump to enable the material to obtain sufficient dynamic pressure to overcome the pipeline resistance to realize conveying. Since this kind of system needs more air and the conveying speed is high, the system wear is aggravated, and the material in the pipeline is stratified and settled to cause pipe blockage.

[0060] According to the technical scheme of the present application, in order to maintain the characteristics of dense phase static pressure pneumatic conveying and achieve the purpose of long distance conveying in the process, a plurality of sets of sectional external pulse type dense phase boosting devices and system pressure control units are arranged and installed on the ash conveying pipeline at certain interval distances. In the front conveying path, the material is in the form of static pressure dense phase slug flow to play the best effect. In the rear conveying path, when the material passes through the sectional external pulse type dense phase boosting device and the pressure control unit, the material obtains certain kinetic energy under the action of the added gas to achieve the best dense phase slug flow state and complete the dense phase static pressure pneumatic conveying.

[0061] The sectional external pulse type dense phase boosting device pneumatic conveying system is arranged and installed with a plurality of sets of sectional external pulse type dense phase boosting devices on the ash conveying pipeline at certain interval distances. The conveying gas is not all added into the silo pump, and the air added into the silo pump only plays the role of pushing the material into the pipeline. The other air is directly added into the pipeline through the sectional external pulse type dense phase boosting device. The air added into the pipeline through the sectional external pulse type dense phase boosting device enables the material to obtain the necessary energy to overcome the pipeline resistance. Since the conveyed material is in the form of group flow or slug flow in the conveying pipeline, but not in the form of complete suspension, the material movement speed is low, and the energy to overcome the pipeline resistance is mainly pressure energy, so that the gas consumption of the system can be greatly reduced, and the pipeline wear can be effectively reduced. Even if the material is stagnant in the pipeline, no matter how long the conveying distance is, the sectional external pulse type dense phase boosting device can restart it. The sectional external pulse type dense phase boosting device arranged in the system effectively realizes the long distance stable and reliable operation of the pneumatic conveying system.

[0062] The compressed air source pressure for transportation is ≥0.6MPa; the operating temperature of the transportation air source is ≥85℃.

[0063] The technical solution of the present application is described below with reference to the accompanying drawings and specific embodiments.

[0064] The desulfurization and denitrification integrated dust removal and desulfurization slaked lime powder pneumatic conveying system according to the present application includes a compressed air storage

[0065] like Figure 1 As shown, the pneumatic conveying system for slaked lime powder with integrated desulfurization and denitrification, dust removal, and desulfurization according to the present application includes a compressed air storage tank 22, a dust collector ash hopper 1, a buffer hopper 7, a silo pump 12, a central ash storage 23, and a PLC control device 21. The buffer hopper 7 is connected to the silo pump 12, and a fluidized booster-type sender 13 and a pipeline-type dense phase booster 17 are provided at the outlet of the silo pump 12. The silo pump 12 is connected to the central ash storage 23 via an ash conveying pipeline 18, and the segmented external side pulse boosters 15 are arranged at intervals along the ash conveying pipeline. The lower part of the dust collector ash hopper 1 is provided with a fluidized drying type cut-out air conveying chute 2 with heating and heat preservation measures, and a fluidized drying type collecting air conveying chute 3 with heating and heat preservation measures. The fluidized drying type collecting air conveying chute 3 is connected with the buffer hopper 7. A pneumatic gate valve 4 is provided above the buffer hopper 7. A fluidization booster device 9 is provided at the lower cone of the buffer hopper 7. A discharger 24 and a powder material crusher 25 are provided at the outlet of the buffer hopper 7. The buffer hopper 7 is provided with a level meter 5 and a thermometer 6. A vibration crushing and screening device 8 is provided in the buffer hopper.

[0066] The entire desulfurization and denitrification integrated dust removal and desulfurization slaked lime powder pneumatic conveying system is equipped with heating (i.e. electric heating or steam heating) insulation devices for the fluidized drying cut-out air conveying chute, fluidized drying collecting air conveying chute, buffer hopper, silo pump tank, and ash conveying pipeline. The conveying air source heating device can use electric heating or steam heating to effectively heat the compressed air source used to convey the desulfurization slaked lime powder mixture in real time, avoiding condensation, sticking and hardening problems during the pneumatic conveying of the desulfurization and denitrification integrated dust removal and desulfurization slaked lime powder mixture, causing equipment blockage, and ensuring the stable and reliable operation of the desulfurization and denitrification integrated dust removal and desulfurization slaked lime powder pneumatic conveying system.

[0067] like Figure 2As shown, each set of sectional external pulse type dense phase boosting device includes a pressure sensor 16 arranged on the ash conveying pipeline 18, a boosting gas source pipeline 26 connected with a short pipe 15-2 through a right-angle electromagnetic pulse valve 15-1, the short pipe 15-2 is communicated with the ash conveying pipeline 13 through a plurality of blowing valve groups I, the blowing valve group I includes a hose 15-3 communicated with the short pipe 15-2 and the ash conveying pipeline 18, and a throttle orifice plate 15-4 and an anti-fouling check valve 15-5 arranged at the connection between the hose 15-3 and the ash conveying pipeline 18. The compressed air provided from the compressed air storage tank 22 enters the boosting gas source pipeline 26, enters the short pipe 15-2 through the right-angle electromagnetic pulse valve 15-1, and then enters the ash conveying pipeline 18 through each blowing valve group I. The pressure sensor detects the pressure of the ash conveying pipeline in the section in real time, and determines whether to open the electromagnetic pulse valve of the external pulse type dense phase boosting device of the corresponding section to pulse blow into the ash conveying pipeline through the logical judgment of the program set by the PLC control device 21.

[0068] The level meter 5 and the temperature meter 6 of the buffer hopper 7 detect the desulfurization and lime powder mixture in the buffer hopper in real time, and according to the signals emitted by the level meter and the temperature meter, the feed into the bin pump is controlled according to the pre-designed process operation program, and the heating device arranged on the buffer hopper is opened / closed.

[0069] When the system of the present application is used for conveying the desulfurization and lime powder mixture, after the feed of the bin pump with heating and insulation measures reaches a certain level (or the set feed time is reached), the pneumatic feed valve 10 and the pneumatic exhaust valve 11 of the bin pump are closed, and then the conveying gas source valve group 19 of the bin pump, the discharge valve 14 of the fluidized boosting type feeder 13 and the pipeline type dense phase booster 17 are opened, the compressed air for ash conveying is heated by the conveying gas source heating device 20, enters the pneumatic conveying system through the branch air pipes of the conveying gas source valve group, and the desulfurization and lime powder mixture is conveyed to the central ash storage 23 through the ash conveying pipeline.

[0070] The pressure sensor 16 arranged on the ash conveying pipeline detects the pressure condition in the region of the ash conveying pipeline in real time, and the PLC control device 21 compares the pressure values detected by all the pressure sensors on the ash conveying pipeline in real time, and judges in real time which interval of the ash conveying pipeline has the trend of pipe blockage, that is, (P1-P N )>P N+1 , (P1-P N )≥0.2-0.22MPa, P1 is the pressure value in the ash conveying pipeline detected by the pressure transmitter arranged closest to the outlet of the bin pump; P N is the pressure value in the ash conveying pipeline detected by the Nth pressure transmitter arranged away from the outlet of the bin pump; P N+1The pressure value in the ash conveying pipeline detected by the N+1th pressure transmitter arranged at the outlet of the distance bin pump immediately opens the electromagnetic pulse valve of the set of sectional external pulse dense phase boosting devices to inject compressed nitrogen into the ash conveying pipeline to perform turbulence boosting. The electromagnetic pulse valve is not continuously opened, but is controlled by a pulse signal according to the set opening and closing time (300-500 ms) to perform pulse dense phase boosting to inject air into the pipeline in the section to perform turbulence boosting. Each time, only the set of sectional external pulse dense phase boosting devices closest to the region with the tendency of pipe blockage is opened, and the other sectional external pulse dense phase boosting devices before and after it are not opened, so that the system can be ensured to be in a stable dense phase static pressure conveying state, and the conveying gas consumption can be maximally saved.

[0071] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are only illustrative but not restrictive. Those skilled in the art can make many forms under the guidance of the present application without departing from the purpose of the present application and the scope protected by the claims, and these all belong to the protection of the present application.

Claims

1. A method for pneumatic conveying using a desulfurization and denitrification integrated dust removal and desulfurization lime powder pneumatic conveying system, characterized in that the desulfurization and denitrification integrated dust removal and desulfurization lime powder pneumatic conveying system comprises a compressed air storage tank, a dust collector hopper, a buffer hopper, a bin pump, a central ash storage and a PLC control device, wherein the dust collector hopper, the buffer hopper and the bin pump are sequentially communicated, a fluidized drying type cut-out air conveying chute and a fluidized drying type collection air conveying chute are arranged at the lower end of the dust collector hopper; a vibrating crushing and screening device is arranged in the buffer hopper, a discharger and a powder material crushing device are sequentially arranged at the outlet of the buffer hopper; the bin pump is communicated with the central ash storage through an ash conveying pipeline; sectional outer by-pass pulse type dense phase boosting devices are arranged at intervals on the ash conveying pipeline; compressed air provided by the compressed air storage tank is directly introduced into the ash conveying pipeline through the bin pump, and the other part is introduced into a boosting air source pipeline through the sectional outer by-pass pulse type dense phase boosting devices and then introduced into the ash conveying pipeline, wherein the boosting air source pipeline is communicated with the ash conveying pipeline through a pipeline; the sectional outer by-pass pulse type dense phase boosting devices comprise a pressure sensor arranged on the ash conveying pipeline and an electromagnetic pulse valve arranged on the pipeline through which the boosting air source pipeline is communicated with the ash conveying pipeline, wherein the electromagnetic pulse valve is controlled by a pulse signal to control the opening or closing of pulse blowing into the ash conveying pipeline, the pressure sensor detects the pressure in the ash conveying pipeline in real time, and determines whether to open the electromagnetic pulse valve of the outer by-pass pulse type dense phase boosting device in the corresponding section to perform pulse blowing into the ash conveying pipeline through logical judgment by a program set by the PLC control device; the method comprises the following steps: when the feeding of the bin pump reaches a set level, the feeding of the bin pump is stopped, and then the compressed air provided by the compressed air storage tank is introduced into the bin pump and then into the ash conveying pipeline; the other part of the compressed air of the compressed air storage tank is introduced into the ash conveying pipeline through the sectional outer by-pass pulse type dense phase boosting devices, wherein the desulfurization and denitrification integrated dust removal and desulfurization lime powder mixture is conveyed into the central ash storage through the ash conveying pipeline; the opening time of the electromagnetic pulse valve is 300-500 ms; the fluidized drying type cut-out air conveying chute, the fluidized drying type collection air conveying chute, the buffer hopper, the bin pump, the ash conveying pipeline and the compressed air storage tank are heat traced and insulated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The pressure sensors arranged on the ash conveying pipeline detect the pressure values in the section of the ash conveying pipeline in real time, and the PLC control device compares the pressure values detected by all the pressure sensors on the ash conveying pipeline in real time, such as P1-P N . N+1 , and P1-P N ≥ 0.2-0.22 MPa, the electromagnetic pulse valve of the sectional external pulse type dense phase boosting device of the section is started to spray compressed conveying gas into the ash conveying pipeline to perform turbulence boosting, wherein P1 is the pressure value in the ash conveying pipeline detected by the first pressure transmitter arranged close to the outlet of the silo pump, P N is the pressure value in the ash conveying pipeline detected by the Nth pressure transmitter arranged away from the outlet of the silo pump, and P N+1 is the pressure value in the ash conveying pipeline detected by the N+1th pressure transmitter arranged away from the outlet of the silo pump. ​ 2. The method of claim 1, wherein, ​ 3. The method of claim 1, wherein, ​

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