An automatic control system for mechanical interlocking electric three-way ventilation door of flue gas reflux in garbage incinerator

Abstract

The present invention relates to an automatic control system for a flue gas return mechanical interlock electric three-way damper of a garbage incinerator, comprising a smoke and air duct, a mechanical interlock electric three-way damper, a manual damper of the smoke and air duct, a sealed fan, and a sealed air heater. The smoke from the outlet of the bag filter is sprayed into the incinerator through the mechanical interlock electric three-way damper and the smoke return fan. The pipeline between the bag filter and the return fan is the main pipeline. In addition, a bypass pipeline and a sealed air pipeline are arranged at the inlet of the return fan. A sealed fan and a sealed fan heater are arranged on the sealed air main pipeline. The sealed air from the sealed fan is connected to the mechanical interlock electric three-way damper on the main pipeline and the bypass pipeline respectively through the sealed air branch pipeline, and a manual damper is arranged on the sealed air branch pipeline. The present invention effectively solves the problem of smoke leakage.

Description

Technical Field

[0001] The invention patent relates to the field of urban domestic waste incineration, especially to a flue gas reflux automatic control system for a three-stage grate type domestic waste incinerator. Background Art

[0002] In recent years, domestic waste incineration power generation technology has been widely used at home and abroad. At the same time, the flue gas emission standards of waste incinerators have become increasingly stringent. In order to achieve ultra-low emissions, the flue gas reflow process is usually used to reduce NOx emissions. When a common damper is installed on the air duct for flue gas reflow, there is a situation of flue gas leakage. Therefore, a process control device that can effectively solve the problem of flue gas leakage is needed. The electric three-door with sealing function can meet this demand. Summary of the invention

[0003] The purpose of the present invention is to provide a waste incinerator flue gas reflow mechanical interlock electric three-way air damper automatic control system, which solves the problem of flue gas leakage caused by the use of ordinary air dampers during flue gas reflow. At the same time, due to the enhanced sealing performance, the problem of flue gas index disturbance caused by the reverse flow of flue gas backflow is further avoided.

[0004] The present invention provides a waste incinerator flue gas reflux mechanical interlocking electric three-way ventilation door automatic control system, comprising main pipes 1, 2, a bypass pipe 3, a sealed air main pipe 6, sealed air branch pipes 4, 5, mechanically interlocking electric three-way ventilation doors 12, 13, a sealed fan 11, a sealed air heater 14 is arranged at the sealed fan outlet, and manual dampers 9, 10 are arranged on the sealed fan outlet branch pipe.

[0005] Furthermore, the mechanical interlock electric three-way ventilation valve is composed of two main dampers of the same specification and a sealing damper with a sealing effect, and can be controlled by one actuator. The mechanical interlock electric three-way ventilation valve is composed of two main dampers of the same specification DN1100 and a sealing damper DN250 with a sealing effect.

[0006] Furthermore, mechanically interlocked electric three-way ventilation dampers 12 and 13 are respectively provided on the smoke return main duct 2 and the bypass duct 3.

[0007] By setting up a mechanically interlocked electric three-way air damper with a sealing function, the smoke leakage problem that only uses one electric air damper baffle is avoided. At the same time, due to the enhanced sealing performance, the smoke index disturbance problem caused by the reverse flow of smoke backflow is further avoided.

[0008] Furthermore, mechanical interlock electric three-way ventilation dampers are respectively arranged on the main duct and the bypass duct. The two mechanical interlock electric three-way ventilation dampers are reversely controlled and correspond to two working conditions respectively. Working condition one: the return air comes from the outlet of the bag filter and is sprayed into the incinerator through the mechanical interlock electric three-way ventilation damper (12), the main duct (2) (1) and the flue gas return fan; working condition two: the return air comes from the incineration room on site and is sprayed into the incinerator through the mechanical interlock electric three-way ventilation damper (13), the bypass duct (3), the main duct (1) and the flue gas return fan.

[0009] Furthermore, a sealing fan is provided for the mechanically interlocked electric three-way ventilation damper to prevent smoke leakage due to the mechanically interlocked electric three-way ventilation damper not being closed tightly.

[0010] Furthermore, an electric heater is provided at the sealing fan outlet to heat the air temperature sent by the sealing fan to the mechanically interlocked electric three-way ventilation damper to about 120°, thereby avoiding corrosion caused by the temperature difference between the unheated normal temperature sealing air and the 150° flue gas return air.

[0011] Furthermore, a manually adjustable damper plate is provided on the outlet branch pipe of the sealed fan, and the air volume of the sealed fan to the mechanically interlocked electric three-way damper can be manually adjusted.

[0012] The technical solution provided by the present invention is: to provide a garbage incinerator flue gas return mechanical interlock electric three-way ventilation door automatic control system, including a flue gas duct, a mechanical interlock electric three-way ventilation door, a flue gas duct manual damper, a sealed fan, and a sealed air heater. There are two working conditions, working condition one: the return air comes from the bag filter outlet, and is sprayed into the incinerator through the mechanical interlock electric three-way ventilation door on the main pipeline, the main pipeline and the flue gas return fan; working condition two: the return air comes from the incineration room on site, and is sprayed into the incinerator through the mechanical interlock electric three-way ventilation door on the bypass pipeline, the bypass pipeline, the main pipeline and the flue gas return fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of the mechanically interlocked electric three-way ventilation door of the present invention.

[0014] Figure 2 Schematic diagram of the system of the present invention.

[0015] Figure 3 Flow chart of working condition 1 of embodiment.

[0016] Figure 4 Flow chart of working condition 2 of embodiment. DETAILED DESCRIPTION

[0017] In order to make the technical solution of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings.

[0018] Figure 1In the mechanical interlock electric three-way damper, two DN1100 dampers in series are connected to a DN250 damper in the middle. The two DN1100 dampers are controlled by the electric actuator to open or close at the same time. The DN250 damper is controlled in the opposite direction to the DN1100 damper. When the DN1100 damper is opened, the DN250 damper is closed. When the DN1100 damper is closed, the DN250 damper is opened.

[0019] There are two working conditions for the flue gas return fan. Working condition one: the mechanical interlock electric three-way ventilation damper 12DN1100 damper is open, the mechanical interlock electric three-way ventilation damper 13DN1100 damper is closed, and the return air of the return fan comes from the bag dust collector outlet; Working condition two: the mechanical interlock electric three-way ventilation damper 13DN1100 damper is open, the mechanical interlock electric three-way ventilation damper 12DN1100 damper is closed, and the return air of the return fan comes from the incineration room on site.

[0020] Working condition 1: When the return air comes from the bag filter outlet, the two DN1100 dampers of the mechanical interlock electric three-way damper 12 are opened, the DN250 damper of the mechanical interlock electric three-way damper 12 is closed, and the manual damper 9 on the duct 4 is opened; the two DN1100 dampers of the mechanical interlock electric three-way damper 13 are closed, the DN250 damper of the mechanical interlock electric three-way damper 13 is opened, and the manual damper 10 on the duct 5 is closed. The working process of the sealed fan and the sealed air heater is as follows: Figure 3 shown.

[0021] When the return air in working condition 2 comes from the local area, the action mode of the mechanical interlock electric three-way ventilation door is reversely controlled with the mechanical interlock electric three-way ventilation door in working condition 1, and the electric heater does not need to be started. The working process is as follows: Figure 4 shown.

[0022] The following is a specific example of the present invention: Working condition 1, when the return air comes from the bag filter outlet, the mechanical interlock electric three-way ventilation door on the return main pipeline is opened, the return flue gas temperature is 150°, and the sealed air is heated to 120°, which avoids the problem of flue gas leakage and solves the corrosion problem caused by temperature difference; Working condition 2, when the return air comes from the local area, the mechanical interlock electric three-way ventilation door on the bypass pipeline is opened, the sealed fan is started but the sealed fan heater does not need to be started. Combined with the incinerator furnace temperature, the oxygen content at the economizer outlet and the secondary air volume, the two working conditions can be flexibly adjusted and used.

[0023] The present invention relates to an automatic control system for a flue gas return mechanical interlock electric three-way damper of a garbage incinerator, and the main body thereof comprises a flue gas duct, a mechanical interlock electric three-way damper, a manual damper of the flue gas duct, a sealed fan, and a sealed air heater. The flue gas from the outlet of the bag filter is sprayed into the incinerator through the mechanical interlock electric three-way damper and the flue gas return fan, the duct between the bag filter and the return fan is the main duct, and a bypass duct and a sealed air duct are arranged at the inlet of the return fan, a sealed fan and a sealed fan heater are arranged on the sealed air main duct, and the sealed air from the sealed fan is respectively connected to the mechanical interlock electric three-way damper on the main duct and the bypass duct through the sealed air branch duct, and a manual damper is arranged on the sealed air branch duct.

[0024] If there is no mechanical interlock electric three-way damper on the pipeline between the bag filter outlet and the return fan inlet, and only an electric damper is used, there is a possibility of smoke leakage due to insufficient sealing performance of the damper. The use of a mechanical interlock electric three-way damper with sealing function effectively solves the problem of smoke leakage. At the same time, due to the enhanced sealing performance, the problem of smoke index disturbance caused by the reverse flow of smoke backflow is further avoided. In addition, a sealed air heater is set at the outlet of the sealed fan to avoid corrosion caused by temperature difference.

Claims

1. A waste incinerator flue gas reflux mechanical interlock electric three-way ventilation door automatic control system, characterized in that: The invention comprises a first main pipeline (1), a second main pipeline (2), a bypass pipeline (3), a first sealed air branch pipeline (4), a second sealed air branch pipeline (5), a sealed air main pipeline (6), a manual air damper (9) on the first sealed air branch pipeline, a manual air damper (10) on the second sealed air branch pipeline, a sealed fan (11), a first mechanical interlocking electric three-way ventilation damper (12), a second mechanical interlocking electric three-way ventilation damper (13) and a sealed air heater (14); the mechanical interlocking electric three-way ventilation damper is respectively arranged on the smoke return main pipeline and the bypass pipeline; The first main pipeline (1) is connected to one end of the second main pipeline (2), and the other end of the second main pipeline (2) is connected to the first damper of the first mechanical interlocking electric three-way ventilation door (12); the first damper of the second mechanical interlocking electric three-way ventilation door (13) is connected to the common end of the first main pipeline (1) and the second main pipeline (2) through the bypass pipeline (3); The second damper of the first mechanical interlock electric three-way damper (12) is connected to the first end of the sealed air main duct (6) through the first sealed air branch duct (4), and the second damper of the second mechanical interlock electric three-way damper (13) is connected to the first end of the sealed air main duct (6) through the second sealed air branch duct (5); the second end of the sealed air main duct (6) is connected to one end of the sealed air heater (14), and the other end of the sealed air heater (14) is connected to the sealed fan (11); The first sealed air branch pipe (4) is provided with the first sealed air branch pipe manual damper (9); the second sealed air branch pipe (5) is provided with the second sealed air branch pipe manual damper (10); The first mechanical interlocking electric three-way ventilation door (12) and the second mechanical interlocking electric three-way ventilation door (13) are both composed of two main dampers of the same specification of DN1100 connected in parallel and a sealing damper of DN250 for sealing and mechanically interlocked.

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