CN219102999U

CN219102999U - Secondary air preheating and recycling flue gas combination system of garbage incinerator

Info

Publication number: CN219102999U
Application number: CN202320001946.4U
Authority: CN
Inventors: 崔青; 冯维; 李响; 倪冰; 冷建平; 杭行
Original assignee: Yangzhou Taida Environmental Protection Co ltd
Current assignee: Yangzhou Taida Environmental Protection Co ltd
Priority date: 2023-01-03
Filing date: 2023-01-03
Publication date: 2023-05-30
Anticipated expiration: 2033-01-03

Abstract

The utility model discloses a secondary air preheating and recycling flue gas combination system of a garbage incinerator, which comprises a flue gas recirculation pipeline and a secondary air pipeline which are arranged in parallel, wherein the outlets of the flue gas recirculation pipeline and the secondary air pipeline are communicated with a secondary air inlet pipe of the garbage incinerator, an inlet of the flue gas recirculation pipeline is communicated with a flue gas outlet of a flue gas purification device through a recirculation fan, an inlet of the secondary air pipeline is communicated with an air inlet through a secondary fan, a first regulating valve and a second regulating valve are arranged on an inlet pipeline of the secondary fan in parallel, and a steam air preheater is connected in series with an outlet of the first regulating valve. The secondary air preheating and recycling flue gas combination system provided by the utility model uses the drainage air, the preheating air and the flue gas recycling air as the secondary air of the garbage incinerator, so that the adjustability of the garbage incineration power generation system is enhanced, the combustion working condition can be optimized, the thermal efficiency is improved, the operation cost is reduced, the flue gas is ensured to meet the emission requirement, and the system has the advantages of stable operation, high economy, high reliability and the like.

Description

Secondary air preheating and recycling flue gas combination system of garbage incinerator

Technical Field

The utility model relates to the technical field of biomass power generation, in particular to a secondary air preheating and recycling flue gas combination system of a garbage incinerator.

Background

At present, most of garbage incinerators widely applied to the market in China are developed on the basis of a mature coal-fired design method, and natural defects exist in recognition and treatment of the combustion and emission characteristics of garbage fuels. The garbage fuel has complex components, high volatile matter content, low fixed carbon content, and a large amount of moisture, is extremely easy to produce secondary pollution, improves the operation emission reduction cost, and has poor adaptability to fuel component differences caused by garbage generation sources, seasons and other changing factors.

Therefore, a new system design scheme is urgently needed to solve the problems of low garbage combustion efficiency, high NOx emission concentration, low operation adjustability, serious high-temperature corrosion and the like.

Disclosure of Invention

The utility model aims to provide a secondary air preheating and recycling flue gas combination system of a garbage incinerator, which is convenient for solving one or more of the system design problems by adjusting the secondary air of the garbage incinerator according to the changing factors of garbage generation sources, seasons and the like.

The purpose of the utility model is realized in the following way: the utility model provides a garbage incinerator overgrate air preheats recirculation flue gas combined system, including parallelly connected flue gas recirculation line and overgrate air pipeline that sets up, flue gas recirculation line and overgrate air pipeline export all communicate with garbage incinerator's overgrate air-supply line, and flue gas recirculation line import is through recirculation fan and fume cleaning device outlet flue intercommunication, and overgrate air pipeline import is through overgrate air fan and air inlet intercommunication, and the overgrate air fan import is provided with first governing valve and second governing valve on the pipeline parallelly connected, and first governing valve export is established ties and is had steam air preheater.

The secondary air preheating and recycling flue gas combination system of the garbage incinerator takes the drainage air, the preheating air and the flue gas recycling air as the secondary air of the garbage incinerator, and the flue gas recycling bad air participates in the flue gas, so that the flue gas is further returned to the incinerator to remove nitrate and sulfur, the emission of environmental pollution gas in the flue gas is reduced, and meanwhile, the high-temperature flue gas can assist in burning in the incinerator, optimize flow field distribution and improve burning working conditions. In summary, the secondary air preheating and recycling flue gas combination system of the garbage incinerator has the advantages of moderately enhancing the adjustability of the garbage incineration power generation system, optimizing the combustion working condition, improving the heat efficiency, reducing the operation cost, ensuring that the flue gas meets the emission requirement, along with stable operation, high economy, high reliability and the like.

As a further improvement of the utility model, the secondary air inlet pipe comprises an upper air inlet pipe and a lower air inlet pipe which are arranged on the upper side and the lower side of the front arch and the rear arch of the garbage incinerator, and a plurality of nozzles are arranged at the outlets of the upper air inlet pipe and the lower air inlet pipe in parallel, so that the temperature and the oxygen concentration in the hearth of the garbage incinerator can be conveniently and cooperatively regulated, the combustion working condition can be further optimized, and the high-temperature corrosion can be effectively inhibited.

As a further improvement of the utility model, the flue gas purifying device comprises a reaction tower, a dust remover and an SCR denitration device which are arranged in series, wherein a flue gas outlet of the SCR denitration device is communicated with a chimney through a draught fan, and an inlet of a flue gas recirculation pipeline is communicated with a flue gas outlet of the dust remover through a recirculation fan. Namely, the inlet of the flue gas recirculation pipeline is connected to the flue gas main pipeline in front of the inlet of the SCR denitration device in the flue gas purification device, the mass concentration of dust in the flue gas phase is low compared with that in the flue gas purification inlet, the abrasion risk of the flue gas recirculation fan is reduced, meanwhile, the consumption of SCR reducer can be reduced compared with that in the flue gas recirculation pipeline inlet connected to the flue gas outlet of the SCR denitration device, and the stability and the economy of the system operation can be considered.

As a further improvement of the utility model, the electric gate valve is arranged in front of the inlet of the recirculation fan, so that when the garbage incinerator is stopped, thorough isolation can be ensured by closing the electric gate valve, and the flue gas is prevented from leaking.

As a further improvement of the utility model, the recirculation fan and the secondary fan both adopt variable frequency centrifugal fans, which is convenient for adjusting the air quantity or the air pressure by a control system or manually.

As a further improvement of the utility model, the flue gas recirculation pipeline, the secondary air pipeline, the upper air inlet pipe and the lower air inlet pipe are all provided with air volume flow meters, so that the air volume conditions of all pipelines can be mastered in real time, and the air volume modulation can be performed in time.

As a further improvement of the utility model, the upper air inlet pipe and the lower air inlet pipe are respectively provided with a third regulating valve, which is convenient for regulating the air quantity of each secondary air branch pipeline and promoting the full combustion of garbage in the hearth.

As a further improvement of the utility model, the variable frequency centrifugal fan, the air volume flowmeter, the first regulating valve, the second regulating valve and the third regulating valve are all connected with the control system, so that the automatic operation of the whole regulating system is conveniently realized.

Drawings

FIG. 1 is a schematic diagram of a secondary air preheating and recycling flue gas combination system of a garbage incinerator.

The flue gas recycling device comprises a flue gas recycling pipeline 1, a secondary air pipeline 2, a recycling fan 3, a secondary air fan 4, a first regulating valve 5, a second regulating valve 6, a steam air preheater 7, an upper air inlet pipe 8, a lower air inlet pipe 9, a garbage incinerator 10, a front arch 10A, a rear arch 10B, a reaction tower 11, a dust remover 12, a 13 SCR denitration device 14, an induced draft fan 15 and a chimney.

Description of the embodiments

The secondary air preheating and recycling flue gas combination system of the garbage incinerator shown in fig. 1 comprises a flue gas recycling pipeline 1 and a secondary air pipeline 2 which are arranged in parallel.

Wherein, the inlet of the flue gas recirculation pipeline 1 is communicated with the flue gas outlet of the flue gas purifying device through a recirculation fan 3. The flue gas purifying device is used for purifying the flue gas generated by the garbage incinerator 10 to enable the flue gas to reach the national and local corresponding flue gas emission standards. The flue gas cleaning device at least comprises a reaction tower 11 and a dust remover 12, and in this embodiment also comprises an SCR denitration device 13. Specifically, the flue gas is treated by a semi-dry deacidification and denitration device in the reaction tower 11 to remove harmful gas substances; dust and particulate matters in the flue gas are removed by a dust remover 12 (a bag-type dust remover is adopted in the embodiment); finally, the SCR denitration device 13 further carries out denitration treatment on the flue gas by utilizing a selective catalytic reduction method. The smoke outlet of the SCR denitration device 13 is communicated with a chimney 15 through a draught fan 14, so that the purified smoke reaching the emission standard can be discharged through the chimney 15. In this embodiment, the inlet of the flue gas recirculation line 1 is in communication with the flue gas outlet of the dust collector 12 via the recirculation fan 3. Namely, the inlet of the flue gas recirculation pipeline 1 is connected to the flue gas main pipeline in front of the inlet of the SCR denitration device 13 in the flue gas purification device, the mass concentration of dust in the flue gas phase is low compared with that in the flue gas purification inlet, the abrasion risk of the flue gas recirculation fan 3 is reduced, meanwhile, the consumption of SCR reducer can be reduced in the flue gas outlet of the SCR denitration device 13 by connecting the inlet of the flue gas recirculation pipeline 1, and the stability and the economical efficiency of the system operation can be considered. An electric gate valve (not shown) is arranged in front of the inlet of the recirculation fan 3, so that when the garbage incinerator 10 is stopped, thorough isolation can be ensured by closing the electric gate valve, and the flue gas is prevented from leaking.

The inlet of the secondary air pipeline 2 is communicated with the air inlet through a secondary air blower 4. The inlet pipeline of the secondary air blower 4 is provided with a first regulating valve 5 and a second regulating valve 6 in parallel, and the outlet of the first regulating valve 5 is connected with a steam air preheater 7 in series. The first regulating valve 5 and the second regulating valve 6 are used for regulating the total air quantity or total air pressure of the air which does not pass through the steam air preheater 7 and the air which passes through the steam air preheater 7. The opening, opening and closing of the first regulating valve 5 and the second regulating valve 6 are regulated by a control system or by manual regulation.

The outlets of the flue gas recirculation pipeline 1 and the secondary air pipeline 2 are communicated with a secondary air inlet pipe of the garbage incinerator 10. The secondary air inlet pipe comprises an upper air inlet pipe 8 and a lower air inlet pipe 9 which are arranged on the upper side and the lower side of the front arch 10A and the rear arch 10B of the garbage incinerator 10. The outlets of the upper air inlet pipe 8 and the lower air inlet pipe 9 are parallel and are provided with a plurality of nozzles. The nozzle is used for spraying mixed gas of air, preheated air and flue gas recirculation wind, and can also spray active water for promoting reduction reaction and combustible oxidation reaction of NOx, so that the temperature and oxygen concentration in the hearth of the garbage incinerator 10 can be adjusted cooperatively.

In this embodiment, both the recirculation fan 3 and the secondary fan 4 are variable frequency centrifugal fans, so that the air volume or the air pressure can be conveniently adjusted by a control system or manually. Air flow meters are arranged on the flue gas recirculation pipeline 1, the secondary air pipeline 2, the upper air inlet pipe 8 and the lower air inlet pipe 9, so that the air flow conditions of all pipelines can be mastered in real time, and the air flow modulation can be performed in time. And the upper air inlet pipe 8 and the lower air inlet pipe 9 are respectively provided with a third regulating valve, so that the air quantity of each secondary air branch pipeline is conveniently regulated, and the full combustion of garbage in a hearth is promoted. Further, the variable frequency centrifugal fan, the air volume flowmeter, the first regulating valve 5, the second regulating valve 6 and the third regulating valve are all connected with the control system, so that the automatic operation of the whole regulating system is conveniently realized.

The secondary air preheating and recycling flue gas combination system of the garbage incinerator has the advantages that the secondary air is used as drainage air, preheating air and flue gas recycling air, and the secondary air is accurately regulated and controlled through the control system, so that the operation adjustability of the system is enhanced, the combustion working condition is optimized, the heat efficiency is improved, the operation cost is reduced, and the system has the advantages of being stable in operation, high in economy and the like on the basis that the flue gas meets the emission requirement and the high reliability of the system. Through operation actual measurement, the secondary air preheating and recycling flue gas combination system of the garbage incinerator can integrally improve the incineration efficiency by 15%, reduce the consumption of the SCR reducer by 18%, and reduce the unplanned shutdown rate by 22%.

The utility model is not limited to the above embodiments, and based on the technical solution disclosed in the utility model, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the utility model.

Claims

1. A waste incinerator secondary air preheats recirculating flue gas combined system which characterized in that: including parallelly connected flue gas recirculation line and overgrate air pipeline that sets up, flue gas recirculation line and overgrate air pipeline export all communicate with the overgrate air inlet pipe of garbage incinerator, flue gas recirculation line import is through recirculating fan and fume cleaning device outlet flue intercommunication, overgrate air pipeline import is through overgrate air machine and air inlet intercommunication, the overgrate air machine import is provided with first governing valve and second governing valve on the pipeline parallelly connected, first governing valve export is established ties and is had steam air preheater.

2. The garbage incinerator secondary air preheating and recycling flue gas combination system according to claim 1, wherein: the secondary air inlet pipe comprises an upper air inlet pipe and a lower air inlet pipe which are arranged on the upper side and the lower side of the front arch and the rear arch of the garbage incinerator, and a plurality of nozzles are arranged at the outlets of the upper air inlet pipe and the lower air inlet pipe in parallel.

3. The garbage incinerator secondary air preheating and recycling flue gas combination system according to claim 1, wherein: the flue gas purification device comprises a reaction tower, a dust remover and an SCR denitration device which are arranged in series, a flue gas outlet of the SCR denitration device is communicated with a chimney through a draught fan, and a flue gas recirculation pipeline inlet is communicated with a flue gas outlet of the dust remover through a recirculation fan.

4. The garbage incinerator secondary air preheating and recycling flue gas combination system according to claim 1, wherein: an electric gate valve is arranged in front of the inlet of the recirculation fan.

5. The garbage incinerator secondary air preheating and recycling flue gas combination system according to claim 1, wherein: the recirculating fan and the secondary fan are both variable-frequency centrifugal fans.

6. The garbage incinerator secondary air preheating and recycling flue gas combination system according to claim 5, wherein: and the flue gas recirculation pipeline, the secondary air pipeline, the upper air inlet pipe and the lower air inlet pipe are all provided with air flow meters.

7. The garbage incinerator secondary air preheating and recycling flue gas combination system according to claim 6, wherein: and the upper air inlet pipe and the lower air inlet pipe are respectively provided with a third regulating valve.

8. The garbage incinerator secondary air preheating and recycling flue gas combination system according to claim 7, wherein: the variable-frequency centrifugal fan, the air volume flowmeter, the first regulating valve, the second regulating valve and the third regulating valve are all connected with the control system.