Graded heating device for gasification air of electrostatic precipitation ash hopper

Abstract

The utility model provides a gasification air graded heating device for an electric precipitation ash hopper. The gasification air graded heating device of the electric precipitation ash hopper comprises a gasification fan, an electric heater, a heat exchange pipeline and a flue gas heat exchanger, the gasification fan is provided with an air outlet pipeline, the electric heater is arranged on the air outlet pipeline of the gasification fan, and the heat exchange pipeline is communicated with the air outlet pipeline and used for penetrating through a boiler tail flue. The flue gas heat exchanger is installed in the heat exchange pipeline and located on a boiler tail flue. According to the device, the flue gas heat exchanger is matched with the electric heater to heat the gasified air, the tail flue gas of the high-heat boiler can be fully utilized to heat the gasified air, the power consumption of the original electric heater can be reduced, and meanwhile, the high-temperature tail flue gas is prevented from damaging equipment.

Description

Technical Field

[0001] The present application belongs to the field of thermal power generation technology, and specifically relates to an electrostatic precipitator ash bucket gasification air classification heating device. Background Art

[0002] The original design of the ash hopper gasification air heating system used electric heating devices to heat the air before delivering it to the various ash hopper users. However, prolonged operation of the electric heating system could easily burn out the resistor wire, potentially causing a short circuit or even a fire. Sustained electric heating operation would consume a lot of power, increasing the plant's electricity usage and failing to achieve energy conservation and consumption reduction goals. Furthermore, high levels of flue gas at the boiler tail could cause high-temperature corrosion in subsequent desulfurization equipment, compromising equipment safety. Utility Model Content

[0003] The technical problem solved by the present application is: how to provide an electrostatic precipitator ash bucket gasification air classification heating device that can reduce the power consumption of electric heating and avoid equipment damage caused by high flue gas temperature at the tail end of the boiler.

[0004] The present application provides a device for heating the hopper-gasified air of electrostatic precipitator ash, which comprises:

[0005] A gasification fan, wherein the gasification fan is provided with an air outlet duct;

[0006] an electric heater, the electric heater being arranged in the air outlet duct of the gasification blower;

[0007] a heat exchange pipe, the heat exchange pipe being in communication with the air outlet pipe and being used to pass through a tail flue of the boiler;

[0008] A flue gas heat exchanger is installed in the heat exchange pipe and located in the tail flue of the boiler.

[0009] Optionally, the electrostatic precipitator ash bucket gasified air classification heating device further includes a flue gas heat exchanger inlet isolation door installed at the inlet of the heat exchange pipe.

[0010] Optionally, the electrostatic precipitator ash hopper gasified air classification heating device further includes a flue gas heat exchanger outlet isolation door installed at the outlet of the heat exchange pipe.

[0011] Optionally, the electrostatic precipitator hopper gasified air classification heating device further comprises:

[0012] An isolation pipe is connected to the air outlet pipe and is connected in parallel with the heat exchange pipe.

[0013] Optionally, the electrostatic precipitator ash bucket gasified air grading heating device further includes a heater outlet isolation door installed on the isolation pipe.

[0014] The present application provides an electrostatic precipitator hopper gasification air classification heating device, which has the following technical effects:

[0015] The device uses a flue gas heat exchanger in conjunction with an electric heater to heat the gasification air, which can fully utilize the high-temperature boiler tail flue gas to heat the gasification air, reduce the power consumption of the original electric heater, and avoid high-temperature tail flue gas damaging the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a device for heating gasified air from an electrostatic precipitator hopper according to one or more embodiments.

[0017] The correspondence between the reference numerals and component names is as follows:

[0018] 10-Gasification fan, 11-Air outlet duct, 20-Electric heater, 30-Heat exchange duct, 40-Flue gas heat exchanger, 50-Flue gas heat exchanger inlet isolation door, 60-Flue gas heat exchanger outlet isolation door, 70-Isolation duct, 80-Heater outlet isolation door, 100-Boiler tail flue. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0020] Before describing the various embodiments of the present application in detail, the technical concept of the present application will first be briefly described: Currently, when adjusting the temperature of the gasification air, an electric heater is directly added at the outlet of the gasification fan, which will result in high energy consumption if it is operated for a long time. To this end, the present application provides an electrostatic precipitator hopper gasification air grading heating device, in which a heat exchange pipe is connected to the air outlet pipe of the gasification fan, the heat exchange pipe is passed into the boiler tail flue, and a flue gas heat exchanger is installed in the heat exchange pipe. This can fully utilize the high-temperature boiler tail flue gas to heat the gasification air, reduce the power consumption of the original electric heater, and prevent high-temperature tail flue gas from damaging the equipment. The specific principles of the electrostatic precipitator hopper gasification air grading heating device of the present application will be described below in conjunction with more embodiments.

[0021] Specifically, if Figure 1As shown, the electrostatic precipitator ash hopper gasification air staged heating device provided in this embodiment includes a gasification fan 10, an electric heater 20, a heat exchange pipe 30, and a flue gas heat exchanger 40. The gasification fan 10 is provided with an air outlet pipe 11. The electric heater 20 is installed in the air outlet pipe 11 of the gasification fan 10. The heat exchange pipe 30 is connected to the air outlet pipe 11 and is used to pass through the boiler tail flue 100. The flue gas heat exchanger 40 is installed within the heat exchange pipe 30 and is located in the boiler tail flue 100. The flue gas heat exchanger 40 and the electric heater 20 are connected in series. The two work together to heat the gasification air generated by the gasification fan before delivering it to the ash hopper user. This not only saves the loss of the electric heater 20, but also reduces the temperature of the tail flue gas, preventing the tail flue gas from damaging the equipment.

[0022] In one or more embodiments, the electrostatic precipitator ash hopper gasification air staged heating device further includes a flue gas heat exchanger inlet isolation door 50 installed at the inlet of the heat exchange duct 30 and a flue gas heat exchanger outlet isolation door 60 installed at the outlet of the heat exchange duct 30. During initial operation, when the tail flue gas is low in volume or temperature, the flue gas heat exchanger inlet isolation door 50 and the flue gas heat exchanger outlet isolation door 60 can be closed, allowing only the electric heater 20 to heat the gasification air. As operation progresses, the two isolation doors can be opened, allowing the gasification air, initially heated by the electric heater 20, to enter the heat exchange duct 30. The flue gas heat exchanger 40 exchanges heat with the tail flue gas, further heating the gasification air until it reaches the desired temperature before being delivered to the ash hopper users. The gasification air then flows along the following path: gasification fan → outlet electric heater → air heat exchanger inlet electric door → flue air heat exchanger → air heat exchanger outlet electric door → various ash hopper users. For example, electric heating is used at the initial start-up of the unit. When the exhaust gas temperature at the electrostatic precipitator outlet is greater than 120°C, the electric heating device is shut down and the boiler tail gas is used to heat the gasification air system. The gasification air after heat exchange with the tail flue gas enters each ash hopper user.

[0023] In one or more embodiments, the electrostatic precipitator ash hopper gasification air grading heating device further includes an isolation duct 70, which is connected to the air outlet duct and is connected in parallel with the heat exchange duct 30. The electrostatic precipitator ash hopper gasification air grading heating device further includes a heater outlet isolation door 80 installed on the isolation duct 70. This design is that the gasification air to flue gas heat exchanger is installed after the electric heating, which can effectively solve the problem of extremely cold weather. The heater outlet isolation door 80 can be closed and the following heating path is adopted: gasification fan → electric heating → flue gas heat exchanger → each ash hopper user. The electric heating and flue gas heat exchanger are operated in series to ensure that the gasification air temperature operates within the specified range. In case of extremely cold weather, the electric heater + tail flue gas heat exchanger can be operated in series to ensure that the gasification temperature can reach the specified range, effectively ensuring that the ash in the ash hopper is dry, preventing the ash in the ash hopper from compacting and bridging, and ensuring the safe and stable operation of the electrostatic precipitator.

[0024] The above describes in detail the specific implementation methods of the present application. Although some embodiments have been shown and described, those skilled in the art should understand that these embodiments can be modified and improved without departing from the principles and spirit of the present application, the scope of which is defined by the claims and their equivalents. These modifications and improvements should also be within the scope of protection of the present application.

Claims

1. An electrostatic precipitator hopper gasification air classification heating device, characterized in that: The electrostatic precipitator hopper gasification air classification heating device includes: A gasification fan, wherein the gasification fan is provided with an air outlet duct; an electric heater, the electric heater being arranged in the air outlet duct of the gasification blower; a heat exchange pipe, the heat exchange pipe being in communication with the air outlet pipe and being used to pass through a tail flue of the boiler; A flue gas heat exchanger is installed in the heat exchange pipe and located in the tail flue of the boiler.

2. The electrostatic precipitator hopper gasification air classification heating device according to claim 1 is characterized in that: The electrostatic precipitator ash bucket gasified air classification heating device also includes a flue gas heat exchanger inlet isolation door installed at the inlet of the heat exchange pipeline.

3. The electrostatic precipitator hopper gasification air classification heating device according to claim 2 is characterized in that: The electrostatic precipitator ash bucket gasified air classification heating device also includes a flue gas heat exchanger outlet isolation door installed at the outlet of the heat exchange pipeline.

4. The electrostatic precipitator hopper gasification air classification heating device according to claim 1 is characterized in that: The electrostatic precipitator hopper gasification air classification heating device also includes: An isolation pipe is connected to the air outlet pipe and is connected in parallel with the heat exchange pipe.

5. The electrostatic precipitator hopper gasification air classification heating device according to claim 4 is characterized in that: The electrostatic precipitator ash bucket gasified air grading heating device also includes a heater outlet isolation door installed on the isolation pipe.

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