CN210645862U

CN210645862U - A dry deacidification treatment system for waste incinerator flue gas

Info

Publication number: CN210645862U
Application number: CN201921222617.2U
Authority: CN
Inventors: 孔华; 王炜
Original assignee: Shenzhen Energy Environmental Engineering Co Ltd
Current assignee: Shenzhen Energy and Environmental Protection Co Ltd
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2020-06-02
Anticipated expiration: 2029-07-29

Abstract

In order to solve the existing problems, the utility model provides a waste incinerator flue gas dry deacidification treatment system, which removes the wet scrubber, and sets a sodium bicarbonate dry reactor in front of the bag filter. The flue gas at the outlet of the waste heat boiler enters the semi-dry reaction tower to remove most of the acid gas and then enters the sodium bicarbonate dry process reactor, which provides the reaction between the flue gas and the sodium bicarbonate absorbent and the adsorption of activated carbon. Sufficient time and space, and the flue gas temperature is the appropriate reaction temperature of sodium bicarbonate and acidic pollutants, which ensures the use of less sodium bicarbonate absorbent to achieve a good deacidification effect, and is conducive to improving the adsorption of activated carbon. Efficiency; compared with wet deacidification, the process flow is greatly simplified, and no deacidification wastewater is generated; since there is no other cooling link behind the semi-dry reaction tower, the reaction temperature is higher, and the flue gas is heated to the temperature required for the SCR reaction Consume less energy, thus greatly reducing investment and operating costs.

Description

Dry deacidification treatment system for flue gas of garbage incinerator

Technical Field

The utility model relates to a waste incinerator flue gas processing system especially relates to a waste incinerator flue gas dry process deacidification processing system.

Background

In order to meet the increasingly strict environmental protection requirements, the technical scheme of the existing flue gas purification system for a plurality of domestic waste incineration projects in China is as follows: the method comprises the steps of a semi-dry reaction tower (an absorbent is calcium hydroxide), activated carbon flue gas injection adsorption, a bag type dust collector, a #1 flue gas/flue gas heat exchanger, a wet washing tower, a #2 flue gas/flue gas heat exchanger, a steam/flue gas heat exchanger and an SCR reactor. This scheme is also known as wet deacidification. The process can greatly reduce the emission concentration of pollutants in the flue gas and meet the requirements stricter than the latest standards of European Union.

The method has the problems that the investment and operation cost of the wet deacidification method is very high, and heat exchangers are required to be added in front of and behind the wet deacidification method, so that the land area, the construction investment and the operation cost of a project are greatly increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the existing problem, the utility model provides a waste incinerator flue gas dry process deacidification processing system gets rid of the wet process scrubbing tower, sets up sodium bicarbonate dry process reactor in bag collector's front. Compared with a wet deacidification method, the process flow is greatly simplified, and deacidification wastewater is not generated; because no other cooling links are arranged behind the semi-dry type reaction tower, the reaction temperature is higher, and the energy consumption for heating the flue gas to the temperature required by the SCR reaction is less, thereby greatly reducing the investment and operation cost and effectively solving the problems in the prior art.

The utility model provides a technical scheme that technical problem adopted is, a waste incinerator flue gas dry process deacidification processing system, according to the flow direction of flue gas, comprises semi-dry reaction tower, bag collector, flue gas heat exchanger, steam gas heat exchanger, SCR reactor, draught fan and chimney in proper order set up active carbon flue injection apparatus before the bag collector let in steam and heat the flue gas and remove the comdenstion water that produces before the steam gas heat exchanger let in ammonia, characterized by before the SCR reactor let in sodium bicarbonate dry process reactor in the front of bag collector still set up sodium bicarbonate flue injection apparatus before the active carbon flue injection apparatus.

The method comprises the following steps that flue gas flows out of a waste heat boiler and enters a semi-dry reaction tower for deacidification, the flue gas flowing out of the semi-dry reaction tower enters a sodium bicarbonate dry reactor and is fully mixed with a sodium bicarbonate absorbent and activated carbon sprayed in the semi-dry reaction tower, acidic pollutants in the flue gas are further reduced by utilizing the characteristics of the sodium bicarbonate and the full reaction time in the reaction tower, then the flue gas passes through a bag type dust collector, the acidic pollutants, heavy metals, dioxin and particulate matters in the flue gas are further removed from the surface of a filter bag, and finally the flue gas is discharged into the atmosphere through a chimney after reaching the SCR reaction temperature through a heat exchanger to remove nitrogen oxides.

The utility model has the advantages that: the utility model provides a waste incinerator flue gas dry process deacidification processing system gets rid of the wet process scrubbing tower, sets up sodium bicarbonate dry process reactor in bag collector's front. Flue gas at the outlet of the waste heat boiler enters a semi-dry type reaction tower to remove most of acid gas and then enters a sodium bicarbonate dry-method reactor, the reactor provides enough time and space for the reaction of the flue gas and a sodium bicarbonate absorbent and the adsorption of active carbon, and the temperature of the flue gas is the proper reaction temperature of the sodium bicarbonate and acid pollutants, so that the good deacidification effect is achieved by using less sodium bicarbonate absorbent, and the adsorption efficiency of the active carbon is improved; compared with wet deacidification, the process flow is greatly simplified, and deacidification wastewater is not generated; because no other cooling links are arranged behind the semi-dry type reaction tower, the reaction temperature is higher, the energy consumption is less when the flue gas is heated to the temperature required by SCR reaction, and the investment and the operation cost are greatly reduced.

Drawings

Fig. 1 is a schematic diagram of an apparatus arrangement according to an embodiment of the prior art.

Fig. 2 is a schematic diagram of an apparatus layout according to an embodiment of the present invention.

Detailed Description

Fig. 1 is a schematic diagram of an apparatus arrangement according to an embodiment of the prior art. In the prior art, the flue gas purification system for the waste incineration project adopts a combined process system of a semi-dry reaction tower (an absorbent is calcium hydroxide), activated carbon flue gas injection adsorption, a bag type dust collector, a 1 st flue gas/flue gas heat exchanger, a wet washing tower, a 2 nd flue gas/flue gas heat exchanger, a steam/flue gas heat exchanger and SCR, so that the process can greatly reduce the emission concentration of pollutants in the flue gas and meet the requirements of the latest standards of the European Union. However, the investment and operation cost of wet deacidification is very high, and heat exchangers are required to be added in front of and behind the investment and operation cost, so that the land area, the construction investment and the operation cost of a project are greatly increased.

Fig. 2 is a schematic diagram of an apparatus layout according to an embodiment of the present invention. In the figure, the system for dry deacidification of the flue gas of the garbage incinerator in the embodiment comprises a semi-dry reaction tower, a bag type dust collector, a flue gas/flue gas heat exchanger, a steam/flue gas heat exchanger, an SCR reactor, an induced draft fan and a chimney in sequence according to the flow direction of the flue gas, wherein an activated carbon flue injection device is arranged in front of the bag type dust collector, steam is introduced in front of the steam/flue gas heat exchanger to heat the flue gas and discharge the generated condensed water, and ammonia gas is introduced in front of the SCR reactor. Different from the prior art, in the embodiment, a wet washing tower is not arranged, a sodium bicarbonate dry reactor is arranged in front of the bag type dust collector, and a sodium bicarbonate flue injection device is arranged before the activated carbon flue injection adsorption.

Compared with the prior art, in the embodiment, the flue gas at the outlet of the waste heat boiler enters the semi-dry type reaction tower to remove most of acid gas and then enters the sodium bicarbonate dry reactor, the reactor provides enough time and space for the reaction of the flue gas and a sodium bicarbonate absorbent and the adsorption of active carbon, and the temperature of the flue gas is the proper reaction temperature of the sodium bicarbonate and acid pollutants, so that the good deacidification effect is ensured by using less sodium bicarbonate absorbent, and the adsorption efficiency of the active carbon is improved; compared with wet deacidification, the process flow is greatly simplified, and deacidification wastewater is not generated; because no other cooling links are arranged behind the semi-dry type reaction tower, the reaction temperature is higher, the energy consumption is less when the flue gas is heated to the temperature required by SCR reaction, and the investment and the operation cost are greatly reduced.

Claims

1. The utility model provides a waste incinerator flue gas dry process deacidification processing system, according to the flow direction of flue gas, comprises half dry reaction tower, bag collector, flue gas heat exchanger, steam gas heat exchanger, SCR reactor, draught fan and chimney in proper order set up active carbon flue injection apparatus before the bag collector steam is let in before the steam gas heat exchanger and is heated the flue gas and discharge the comdenstion water that produces let in before the SCR reactor and let in the ammonia, characterized by bag collector set up sodium bicarbonate dry process reactor in the front, still set up sodium bicarbonate flue injection apparatus before active carbon flue injection apparatus.