Hopper fluidized air system and control method for semi-dry electric bag composite dust removal

Abstract

The present invention discloses a hopper fluidized air system and a control method thereof for semi-dry electric bag composite dust removal. The system comprises: a semi-dry desulfurization and dust removal unit, comprising a semi-dry absorption tower and an electric bag composite dust collector composed of an inertial dust removal zone, an electric dust removal zone and a bag dust removal zone connected in series, an inertial zone hopper fluidized subunit at the bottom of the inertial dust removal zone, an electric dust removal zone hopper fluidized subunit at the bottom of the electric dust removal zone and a bag dust removal zone hopper fluidized subunit at the bottom of the bag dust removal zone are respectively connected to the semi-dry absorption tower through a return chute; an ash hopper fluidized air control unit comprises an ash hopper fluidized air unit and each fluidized air control subunit respectively connected to each ash hopper fluidized subunit and the return chute and capable of feeding fluidized air. The method uses the system to control the dynamic balance between the material level and the fluidized air in each ash hopper fluidized subunit. The present invention realizes the unified distribution of ash hopper fluidized air and return chute fluidized air through the design of fluidized air pipeline, saving the investment of traditional chute fluidized air fans.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas dust removal for desulfurization, and more specifically, to an ash hopper fluidized air system for semi-dry electric bag composite dust removal and a control method thereof. Background Art

[0002] Semi-dry desulfurization and dust removal technology has been increasingly widely used in flue gas treatment in coal-fired boilers, chemical coke ovens, rotary kilns, waste incineration and other fields due to its simple equipment system, small initial investment, relatively high desulfurization efficiency, integrated desulfurization and dust removal, and no desulfurization wastewater discharge. In recent years, an electric bag composite dust removal technology has been applied to semi-dry desulfurization and dust removal projects. This electric bag load dust removal technology generally uses pre-set large-section blinds and other inertial dust removal areas for pre-dust removal, sets high-voltage electrostatic dust removal at the front to achieve a higher dust removal efficiency, and sets bags at the rear for final dust removal of charged agglomerated dust, making full use of the advantages of electric dust removal and bag dust removal to ensure ultra-low emissions.

[0003] Due to the characteristics of the semi-dry desulfurization and dust removal process, in actual operation, there will be two operating conditions: high-concentration dust when the absorption tower is built and low-concentration dust when the absorption tower is not built. The electric bag load dust removal technology sets up three-stage series dust removal equipment of inertial dust removal, electric dust removal, and bag dust removal in accordance with the flue gas flow direction. When the semi-dry method is running under the condition of building a bed and not building a bed, the difference in the efficiency of the three-stage dust removal leads to obvious differences in the dust removal volume and ash hopper material level of each dust collector: the electric dust removal efficiency is greater than 80% when the absorption tower is not built, the electric dust removal efficiency is ~50% after the bed is built, and the bag dust removal efficiency is ~35%. When the unit load fluctuates with the power grid, the changes in dust removal efficiency and dust removal amount lead to the destruction of the balance between the fluidizing air in the ash hopper and the material level in the ash hopper. The fluidizing air in the ash hopper flows in the ash hoppers at all levels, causing flashover of the electrostatic precipitator, ash leakage due to high material level in the bag area, high wear of the fluidizing air speed in some ash hoppers due to low material level, and poor return of materials in the return chute. This situation leads to unstable operation of semi-dry desulfurization and on-site ash leakage, affecting safe and civilized production. Summary of the invention

[0004] In view of various operational problems caused by differences in dust removal efficiency and ash hopper material levels at various levels in series in actual projects of semi-dry electric bag composite dust removal technology, the present invention proposes an ash hopper fluidizing air system and a control method for semi-dry electric bag composite dust removal, which can ensure that the fluidizing air and fly ash amount in each level of ash hopper match each other and solve the problem of serious electric field flashover caused by fly ash accumulation on the electrode plates and fly ash dust of the electrostatic precipitator.

[0005] To this end, one aspect of the present invention provides a hopper fluidized air system for semi-dry electric bag composite dust removal, comprising:

[0006] A semi-dry desulfurization and dust removal unit comprises a semi-dry absorption tower and an electric bag composite dust collector which is composed of an inertial dust removal zone, an electrostatic dust removal zone and a bag dust removal zone connected in series, wherein the outlet of the semi-dry absorption tower is connected to the inlet of the electric bag composite dust collector, and the inertial zone ash bucket fluidizing subunit at the bottom of the inertial dust removal zone, the electrostatic dust removal zone ash bucket fluidizing subunit at the bottom of the electrostatic dust removal zone, and the bag dust removal zone ash bucket fluidizing subunit at the bottom of the bag dust removal zone in the electric bag composite dust collector are respectively connected to the semi-dry absorption tower through a return chute;

[0007] The ash hopper fluidizing air control unit comprises an ash hopper fluidizing air unit and an inertia zone fluidizing air control subunit, an electrostatic precipitator zone fluidizing air control subunit, a bag filter zone fluidizing air control subunit and a chute fluidizing air control subunit, which are respectively connected to the inertia zone ash hopper fluidizing subunit, the electrostatic precipitator zone ash hopper fluidizing subunit, the bag filter zone ash hopper fluidizing subunit and the return chute and can supply fluidizing air.

[0008] According to an embodiment of the ash hopper fluidized air system for semi-dry electric bag composite dust removal of the present invention, the outlet of the electric bag composite dust collector is connected to the induced draft fan, the outlet of the induced draft fan is connected to the chimney, and each ash hopper fluidizing sub-unit includes an ash hopper and a fluidizing device arranged in the ash hopper.

[0009] According to an embodiment of the ash hopper fluidizing air system for semi-dry electric bag composite dust removal of the present invention, the inertial zone fluidizing air control subunit includes an inertial zone fluidizing air branch connecting the ash hopper fluidizing air unit and the inertial zone ash hopper fluidizing subunit, and a first pressure gauge and an electric regulating valve arranged on the inertial zone fluidizing air branch.

[0010] According to an embodiment of the ash hopper fluidizing air system for semi-dry electric bag composite dust removal of the present invention, the electrostatic precipitator area fluidizing air control subunit includes an electrostatic precipitator area fluidizing air branch connecting the ash hopper fluidizing air unit and the electrostatic precipitator area ash hopper fluidizing subunit, and a second pressure gauge and an electric regulating valve arranged on the electrostatic precipitator area fluidizing air branch.

[0011] According to an embodiment of the ash hopper fluidizing air system for semi-dry electric bag composite dust removal of the present invention, the bag dust removal area fluidizing air control subunit includes a bag dust removal area fluidizing air branch connecting the ash hopper fluidizing air unit and the bag dust removal area ash hopper fluidizing subunit, and a third pressure gauge and an electric regulating valve arranged on the bag dust removal area fluidizing air branch.

[0012] According to an embodiment of the ash hopper fluidizing air system for semi-dry electric bag composite dust removal of the present invention, the chute fluidizing air control subunit includes a chute fluidizing air branch connecting the ash hopper fluidizing air unit and the return chute, and a fourth pressure gauge and an electric regulating valve arranged on the chute fluidizing air branch.

[0013] According to an embodiment of the ash hopper fluidizing air system for semi-dry electric bag composite dust removal of the present invention, the ash hopper fluidizing air unit includes at least two fluidizing fans arranged in parallel, and at least one fluidizing fan is started during system operation to keep the fluidizing air pressure stable.

[0014] Another aspect of the present invention provides a control method for the ash hopper fluidized air system for semi-dry electric bag composite dust removal. During system operation, the dynamic balance between the material level and the fluidized air in each ash hopper fluidized sub-unit in the semi-dry desulfurization and dust removal unit is controlled by adjusting the ash hopper fluidized air control unit.

[0015] According to an embodiment of the control method of the ash hopper fluidized air system for semi-dry electric bag composite dust removal of the present invention, under the condition of semi-dry method without bed construction, the fluidized air opening in the ash hopper fluidized subunit of the electrostatic precipitator area is adjusted to 70-100% by the fluidized air control subunit of the electrostatic precipitator area, the fluidized air opening in the ash hopper fluidized subunit of the inertial area is adjusted to 0-20% by the fluidized air control subunit of the inertial area, and the ash hopper of the bag dust removal area is adjusted by the fluidized air control subunit of the bag dust removal area. The fluidizing air opening in the fluidizing subunit is 0-40%, and the branch pressures in the inertial zone fluidizing air control subunit, the electrostatic precipitator zone fluidizing air control subunit, and the bag dust removal zone fluidizing air control subunit are maintained at 6-10 kPa; the fluidizing air opening in the return chute is adjusted to 0-20% through the chute fluidizing air control subunit, and the branch pressure in the chute fluidizing air control subunit is maintained at 0-6 kPa, thereby maintaining a dynamic balance between the material level and the fluidizing air in each ash hopper fluidizing subunit.

[0016] According to an embodiment of the control method of the ash hopper fluidized air system for semi-dry electric bag composite dust removal of the present invention, under the semi-dry bed construction condition, the fluidized air opening in the ash hopper fluidized subunit of the electrostatic precipitator area is adjusted to 50-100% by the fluidized air control subunit of the electrostatic precipitator area, the fluidized air opening in the ash hopper fluidized subunit of the inertial area is adjusted to 0-50% by the fluidized air control subunit of the inertial area, and the fluidized air opening in the ash hopper fluidized subunit of the bag dust removal area is adjusted to 0-50% by the fluidized air control subunit of the bag dust removal area. The fluidizing air opening in the unit is 25-75%, and the branch pressures in the inertial zone fluidizing air control subunit, the electrostatic precipitator zone fluidizing air control subunit, and the bag filter zone fluidizing air control subunit are maintained at 12-16 kPa; the fluidizing air opening in the return chute is adjusted to 30-80% through the chute fluidizing air control subunit, and the branch pressure in the chute fluidizing air control subunit is maintained at 8-12 kPa, thereby maintaining a dynamic balance between the material level and the fluidizing air in each ash hopper fluidizing subunit.

[0017] The present invention aims at the obvious differences in dust removal efficiency and dust removal amount at each level caused by the series arrangement technology of semi-dry electric bag composite dust removal, draws on the fluidization theory, and realizes the dynamic balance of the ash hopper fluidization air and the ash hopper material level through the adjustment of the fluidization air system pipeline and the ash hopper material level, which can solve the problem of frequent flashover of the electric field of the electric bag composite dust collector and ensure the stable operation of the semi-dry bed construction with low material level in the ash hopper. Compared with the semi-dry desulfurization and dust removal technology in the prior art, the present invention realizes the unified distribution of the ash hopper fluidization air and the return chute fluidization air through the design of the fluidization air pipeline, saving the investment of the traditional chute fluidization fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a hopper fluidized air system for semi-dry electric bag composite dust removal according to an exemplary embodiment of the present invention is shown.

[0019] Description of reference numerals:

[0020] 1-semi-dry absorption tower, 2-inertial dust removal area, 3-electrostatic dust removal area, 4-bag dust removal area, 5-induced draft fan, 6-chimney, 7-inertial area ash hopper fluidization subunit, 8-electrostatic dust removal area ash hopper fluidization subunit, 9-bag dust removal area ash hopper fluidization subunit, 10-return material chute, 11-ash hopper fluidization fan unit, 12-inertial area fluidization air branch, 13-electrostatic dust removal area fluidization air branch, 14-bag dust removal area fluidization air branch, 15-chute fluidization air branch, 16-first pressure gauge and electric regulating valve, 17-second pressure gauge and electric regulating valve, 18-third pressure gauge and electric regulating valve, 19-fourth pressure gauge and electric regulating valve. DETAILED DESCRIPTION

[0021] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0022] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0023] In view of various operational problems caused by differences in dust removal efficiency at various levels in series and ash hopper material levels in actual projects of semi-dry electric bag composite dust removal technology, the present invention proposes an ash hopper fluidized air system and a control method for semi-dry electric bag composite dust removal. By monitoring the pressure of the ash hopper fluidized air pipeline and controlling the valve opening, the fluidized air and fly ash amount in the ash hoppers at each level are matched, and the serious electric field flashover caused by fly ash accumulation on the plates and fly ash dust in the electrostatic precipitator is solved, and the stable operation of the system is ensured while stabilizing the material circulation.

[0024] Figure 1A schematic structural diagram of a hopper fluidized air system for semi-dry electric bag composite dust removal according to an exemplary embodiment of the present invention is shown.

[0025] Specifically, Figure 1 As shown, according to an exemplary embodiment of the present invention, the ash hopper fluidized air system for semi-dry electric bag composite dust removal includes a semi-dry desulfurization and dust removal unit for achieving flue gas desulfurization and dust removal and an ash hopper fluidized air control unit for matching the fluidized air of each ash hopper with the amount of fly ash in the semi-dry desulfurization and dust removal unit. Through the ash hopper fluidized air system, in the semi-dry bed construction and non-bed construction operation, the fluidized air opening of each ash hopper is adjusted according to the fluidized air pipeline pressure, bed pressure, etc. in the system, to achieve a dynamic balance between the material level in the ash hopper and the fluidized air to ensure the stable and economical operation of the system.

[0026] Specifically, the semi-dry desulfurization and dust removal unit includes a semi-dry absorption tower 1 and an electric bag composite dust collector composed of an inertial dust removal zone 2, an electrostatic dust removal zone 3 and a bag dust removal zone 4 connected in series. The outlet of the semi-dry absorption tower 1 is connected to the inlet of the electric bag composite dust collector. In the electric bag composite dust collector, the inertial zone ash bucket fluidizing subunit 7 at the bottom of the inertial dust removal zone 1, the electrostatic dust removal zone ash bucket fluidizing subunit 8 at the bottom of the electrostatic dust removal zone 3 and the bag dust removal zone ash bucket fluidizing subunit 9 at the bottom of the bag dust removal zone 4 are respectively connected to the semi-dry absorption tower 1 through a return chute 10. Among them, the electric bag composite dust collector including the inertial dust removal zone 2, the electrostatic dust removal zone 3 and the bag dust removal zone 4 can adopt a device with existing structure and principle, which will not be repeated here.

[0027] In addition, the outlet of the electric bag composite dust collector is connected to the induced draft fan 5, and the outlet of the induced draft fan 5 is connected to the chimney 6. Each ash hopper fluidizing subunit includes an ash hopper and a fluidizing device arranged in the ash hopper. For the convenience of description, the following description is based on the ash hopper fluidizing subunit.

[0028] Thus, the flue gas at the inlet of the absorption tower passes through the semi-dry absorption tower 1 and the electric bag composite dust collector for desulfurization and dust removal in turn, and then enters the chimney 6 through the induced draft fan 5 and is discharged into the atmosphere. In the electric bag composite dust collector, after dust removal in the inertial dust removal area 2, the fly ash enters the inertial area ash bucket fluidization subunit 7, after dust removal in the electrostatic precipitator area 3, the fly ash enters the electrostatic precipitator area ash bucket fluidization subunit 8, and after dust removal in the bag filter area 4, the fly ash enters the bag filter area ash bucket fluidization subunit 9. The fly ash collected by the electric bag composite dust collector is fluidized in each ash hopper through the ash hopper fluidization wind control unit and then distributed into the return chute 10. The return chute is connected to the absorption tower 1 and returns the fly ash to realize the fly ash circulation. The excess fly ash in each ash hopper fluidization subunit can be discharged through the ash conveying pipeline.

[0029] According to the present invention, the ash hopper fluidizing air control unit includes an ash hopper fluidizing air unit 11 and an inertial zone fluidizing air control subunit, an electrostatic precipitator zone fluidizing air control subunit, a bag filter zone fluidizing air control subunit and a chute fluidizing air control subunit, which are respectively connected to the inertial zone ash hopper fluidizing subunit 7, the electrostatic precipitator zone ash hopper fluidizing subunit 8, the bag filter zone ash hopper fluidizing subunit 9 and the return chute 10 and can supply fluidizing air.

[0030] The hopper fluidizing fan unit 11 includes at least two fluidizing fans arranged in parallel, and at least one fluidizing fan is started during system operation to keep the fluidizing air pressure stable.

[0031] Specifically, the inertial zone fluidizing wind control subunit includes an inertial zone fluidizing wind branch 12 connecting the ash hopper fluidizing wind unit 11 and the inertial zone ash hopper fluidizing subunit 7, and a first pressure gauge and an electric regulating valve 16 arranged on the inertial zone fluidizing wind branch 12; the electrostatic precipitator zone fluidizing wind control subunit includes an electrostatic precipitator zone fluidizing wind branch 13 connecting the ash hopper fluidizing wind unit 11 and the electrostatic precipitator zone ash hopper fluidizing subunit 8, and a second pressure gauge and an electric regulating valve arranged on the electrostatic precipitator zone fluidizing wind branch 13. Valve 17; the bag-type dust removal area fluidizing air control subunit includes a bag-type dust removal area fluidizing air branch 14 connecting the ash hopper fluidizing air unit 11 and the bag-type dust removal area ash hopper fluidizing subunit 9, and a third pressure gauge and an electric regulating valve 18 arranged on the bag-type dust removal area fluidizing air branch 14; the chute fluidizing air control subunit includes a chute fluidizing air branch 15 connecting the ash hopper fluidizing air unit 11 and the return chute 10, and a fourth pressure gauge and an electric regulating valve 19 arranged on the chute fluidizing air branch 15.

[0032] Among them, the above-mentioned inertial zone fluidizing air branch 12, electrostatic precipitator zone fluidizing air branch 13, bag filter zone fluidizing air branch 14 and chute fluidizing air branch 15 are arranged in parallel, and the pressure gauge and electric regulating valve arranged on the branch are used to monitor the pressure in real time and adjust the opening electrically. During the operation of the system, according to the bed pressure drop of the semi-dry absorption tower, several ash hopper fluidizing fans are selectively started and the opening of the electric regulating valve of each ash hopper fluidizing air branch is adjusted to control the opening of the fluidizing air in the ash hopper fluidizing subunit, so as to achieve a dynamic balance between the material level and the fluidizing air in each ash hopper fluidizing subunit.

[0033] The control method of the ash hopper fluidized air system for semi-dry electric bag composite dust removal of the present invention is to control the dynamic balance of the material level and fluidized air in each ash hopper fluidized sub-unit in the semi-dry desulfurization and dust removal unit by adjusting the ash hopper fluidized air control unit during system operation.

[0034] Semi-dry desulfurization and dust removal systems generally have two operating conditions: no bed building condition and bed building condition. The bed building condition refers to the semi-dry system returning the fly ash in the ash hopper to the absorption tower under the set flue gas volume to establish a 1.0-1.2kpa "bed layer" to accelerate the turbulence of the material in the absorption tower and the desulfurization efficiency. In the semi-dry bed building condition, the dust content entering the dust removal system is ~1000g / Nm 3 The material in the non-bed condition does not participate in the circulation, and the dust content entering the dust removal system is 50g / Nm 3 .

[0035] Specifically, under the condition of semi-dry method without bed construction, the fluidizing air opening in the ash bucket fluidizing subunit of the electrostatic precipitator zone is adjusted to 70-100% through the fluidizing air control subunit of the electrostatic precipitator zone, the fluidizing air opening in the ash bucket fluidizing subunit of the inertia zone is adjusted to 0-20% through the fluidizing air control subunit of the inertia zone, and the fluidizing air opening in the ash bucket fluidizing subunit of the bag filter zone is adjusted to 0-40% through the fluidizing air control subunit of the bag filter zone. The fluidizing air control subunit of the inertia zone, the fluidizing air control subunit of the electrostatic precipitator zone, and the bag filter zone are maintained. The pressure of each branch in the fluidizing air control subunit in the dust zone is 6-10kPa, and the opening of the electric regulating valve on the fluidizing air branch is adjusted in time through the pressure monitoring of the pressure gauge to maintain the dynamic balance between the material level and the fluidizing air in each ash hopper fluidizing subunit; at the same time, the fluidizing air opening in the return chute is adjusted to 0-20% through the chute fluidizing air control subunit, and the branch pressure in the chute fluidizing air control subunit is maintained at 0-6kPa to prevent the flue gas from the semi-dry absorption tower from flowing back from the return chute and causing frequent flashover of secondary dust in the electrostatic precipitator.

[0036] The control and adjustment of parameters such as the valve opening of the ash hopper fluidizing air valves at all levels mentioned above is mainly to match the dust removal efficiency of different dust removal equipment, give full play to the high dust removal efficiency of the electrostatic precipitator at low dust content without bed construction, reduce the dust removal pressure and backblowing cleaning frequency of the bag filter, and extend the service life of the bags; regarding the pressure adjustment of the ash hopper fluidizing fan outlet pressure of 6 to 10 kpa, maintain a lower ash hopper material level and reduce the fan operating current to reduce equipment power consumption.

[0037] Under the semi-dry bed construction condition, due to the changes in dust concentration and dust removal efficiency of each level of dust collector, the fluidizing air opening in the ash bucket fluidizing subunit of the electrostatic precipitator area is adjusted to 50-100% through the fluidizing air control subunit of the electrostatic precipitator area, the fluidizing air opening in the ash bucket fluidizing subunit of the inertial area is adjusted to 0-50% through the fluidizing air control subunit of the inertial area, and the fluidizing air opening in the ash bucket fluidizing subunit of the bag dust removal area is adjusted to 25-75% through the fluidizing air control subunit of the bag dust removal area. The fluidizing air control subunit of the inertial area and the electrostatic precipitator area are maintained. The pressure of each branch in the fluidizing air control subunit and the bag dust removal area fluidizing air control subunit is 12~16kpa, and the opening of the electric regulating valve on the fluidizing air branch is adjusted in time through the pressure monitoring of the pressure gauge to maintain the dynamic balance between the material level and the fluidizing air in each ash hopper fluidizing subunit; at the same time, the fluidizing air opening in the return chute is adjusted to 30~80% through the chute fluidizing air control subunit, and the branch pressure in the chute fluidizing air control subunit is maintained at 8~12kpa, maintaining the dynamic balance between the material level and the fluidizing air in each ash hopper fluidizing subunit.

[0038] The idea of ​​controlling and adjusting the parameters such as the valve opening of the ash hopper fluidization air valve and the fan outlet pressure mentioned above is similar to the working condition without bed construction. It is mainly to match the dust removal characteristics of the dust collector under high dust content, maintain a dust collection capacity of more than 50% through electrostatic precipitator, and ensure the outlet dust content meets the standard through the stability of bag dust removal. By making full use of the dust removal characteristics of dust removal equipment at all levels, it not only meets the national ultra-low emission standards, but also balances the ash hopper material level and ash hopper fluidization air volume to ensure the stable and economical operation of the unit.

[0039] In actual operation, the pressure of each level of fluidizing air branch can also be maintained by the unit operating load, bed pressure drop, etc., and the opening of the electric regulating valve on the fluidizing air branch can be flexibly adjusted to achieve fluidizing air control.

[0040] Through the implementation of the technical scheme and control method of the present invention, in the actual operation of a 350MW semi-dry electric bag composite dust removal project, under the premise of ensuring the stability of the semi-dry bed construction, the outlet pressure of the ash hopper fluidizing fan was reduced from 18-22kpa to 12-16kpa, and the fan operating current was reduced from ~140A to ~128A; the flashover and dust accumulation short-circuit fault exit conditions that appeared in the early stage of the electrostatic precipitator were also significantly improved, which was beneficial to ensure the economic and stable operation of the project.

[0041] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A hopper fluidized air system for semi-dry electric bag composite dust removal, characterized in that: include: A semi-dry desulfurization and dust removal unit comprises a semi-dry absorption tower and an electric bag composite dust collector which is composed of an inertial dust removal zone, an electrostatic dust removal zone and a bag dust removal zone connected in series, wherein the outlet of the semi-dry absorption tower is connected to the inlet of the electric bag composite dust collector, and the inertial zone ash bucket fluidizing subunit at the bottom of the inertial dust removal zone, the electrostatic dust removal zone ash bucket fluidizing subunit at the bottom of the electrostatic dust removal zone, and the bag dust removal zone ash bucket fluidizing subunit at the bottom of the bag dust removal zone in the electric bag composite dust collector are respectively connected to the semi-dry absorption tower through a return chute; An ash hopper fluidizing air control unit comprises an ash hopper fluidizing air unit and an inertia zone fluidizing air control subunit, an electrostatic precipitator zone fluidizing air control subunit, a bag filter zone fluidizing air control subunit and a chute fluidizing air control subunit, which are respectively connected to the inertia zone ash hopper fluidizing subunit, the electrostatic precipitator zone ash hopper fluidizing subunit, the bag filter zone ash hopper fluidizing subunit and the return chute and are capable of feeding fluidizing air; The inertia zone fluidizing wind control subunit comprises an inertia zone fluidizing wind branch connecting the ash hopper fluidizing wind unit and the inertia zone ash hopper fluidizing subunit, and a first pressure gauge and an electric regulating valve arranged on the inertia zone fluidizing wind branch; The electrostatic precipitator zone fluidizing air control subunit comprises an electrostatic precipitator zone fluidizing air branch connecting the ash hopper fluidizing air unit and the electrostatic precipitator zone ash hopper fluidizing subunit, and a second pressure gauge and an electric regulating valve arranged on the electrostatic precipitator zone fluidizing air branch; The bag dust removal area fluidizing air control subunit includes a bag dust removal area fluidizing air branch connecting the ash hopper fluidizing air unit and the bag dust removal area ash hopper fluidizing subunit, and a third pressure gauge and an electric regulating valve arranged on the bag dust removal area fluidizing air branch; The chute fluidizing air control subunit comprises a chute fluidizing air branch connecting the ash hopper fluidizing air unit and the return material chute, and a fourth pressure gauge and an electric regulating valve arranged on the chute fluidizing air branch.

2. The hopper fluidized air system for semi-dry electric bag composite dust removal according to claim 1 is characterized in that: The outlet of the electric bag composite dust collector is connected to the induced draft fan, and the outlet of the induced draft fan is connected to the chimney. Each ash hopper fluidization subunit includes an ash hopper and a fluidization device arranged in the ash hopper.

3. The hopper fluidized air system for semi-dry electric bag composite dust removal according to claim 1 is characterized in that: The ash hopper fluidizing fan unit includes at least two fluidizing fans arranged in parallel, and at least one fluidizing fan is started during system operation to keep the fluidizing air pressure stable.

4. The control method of the hopper fluidized air system for semi-dry electric bag composite dust removal according to any one of claims 1 to 3, characterized in that: During system operation, the dynamic balance between the material level and the fluidizing air in each ash hopper fluidizing sub-unit in the semi-dry desulfurization and dust removal unit is controlled by adjusting the ash hopper fluidizing air control unit.

5. The control method of the hopper fluidized air system for semi-dry electric bag composite dust removal according to claim 4 is characterized in that: Under the semi-dry method without bed construction, the fluidizing air opening in the ash hopper fluidizing subunit of the electrostatic precipitator area is adjusted to 70~100% through the fluidizing air control subunit of the electrostatic precipitator area, the fluidizing air opening in the ash hopper fluidizing subunit of the inertia area is adjusted to 0~20% through the fluidizing air control subunit of the inertia area, and the fluidizing air opening in the ash hopper fluidizing subunit of the bag filter area is adjusted to 0~40% through the fluidizing air control subunit of the bag filter area, and the pressure of each branch in the fluidizing air control subunit of the inertia area, the fluidizing air control subunit of the electrostatic precipitator area, and the fluidizing air control subunit of the bag filter area is maintained at 6~10kpa; the fluidizing air opening in the return chute is adjusted to 0~20% through the chute fluidizing air control subunit, and the branch pressure in the chute fluidizing air control subunit is maintained at 0~6kpa, and the dynamic balance between the material level and the fluidizing air in each ash hopper fluidizing subunit is maintained.

6. The control method of the hopper fluidized air system for semi-dry electric bag composite dust removal according to claim 4 is characterized in that: Under the semi-dry bed construction condition, the fluidizing air opening in the ash hopper fluidizing subunit of the electrostatic precipitator area is adjusted to 50~100% through the fluidizing air control subunit of the electrostatic precipitator area, the fluidizing air opening in the ash hopper fluidizing subunit of the inertia area is adjusted to 0~50% through the fluidizing air control subunit of the inertia area, and the fluidizing air opening in the ash hopper fluidizing subunit of the bag filter area is adjusted to 25~75% through the fluidizing air control subunit of the bag filter area, and the pressure of each branch in the fluidizing air control subunit of the inertia area, the fluidizing air control subunit of the electrostatic precipitator area, and the fluidizing air control subunit of the bag filter area is maintained at 12~16kpa; the fluidizing air opening in the return chute is adjusted to 30~80% through the chute fluidizing air control subunit, and the branch pressure in the chute fluidizing air control subunit is maintained at 8~12kpa, and the dynamic balance between the material level and the fluidizing air in each ash hopper fluidizing subunit is maintained.

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