CN217274174U

CN217274174U - Device for utilizing SNCR (selective non-catalytic reduction) denitration technology on special waste fluidized bed incinerator

Info

Publication number: CN217274174U
Application number: CN202220684049.3U
Authority: CN
Inventors: 江荣生; 龙沛沛; 陈建洪; 唐庆霖
Original assignee: Fujian Environmental Engineering Co ltd
Current assignee: Fujian Environmental Engineering Co ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-08-23
Anticipated expiration: 2032-03-28

Abstract

The utility model relates to a SNCR denitration technique burns burning furnace at special waste material fluidized bed and goes up utilization equipment, including burning furnace body, the exhanst gas outlet that burns burning furnace body top is connected with horizontal flue through slope section, exhanst gas outlet is provided with the over heater, install reductant aqueous ammonia injection apparatus on the horizontal flue, follow flue gas output direction and connected gradually boiler, waste heat utilization equipment and flue gas processing apparatus on the horizontal flue. The device can realize that nitrogen oxide emission is greatly reduced when burning the wastes.

Description

Device for utilizing SNCR (selective non-catalytic reduction) denitration technology on special waste fluidized bed incinerator

Technical Field

The utility model relates to a SNCR denitration technique utilizes device on special waste material fluidized bed burns burning furnace.

Background

The fluidized bed incinerator has the characteristics of wide fuel adaptability, high combustion efficiency, low nitrogen oxide emission and the like, and is widely used in production, in recent years, the thermal engineering research institute of Zhejiang university expands the fluidized bed incinerator to the field of hazardous waste incineration, develops a special waste fluidized bed incinerator, and realizes effective disposal of hazardous solid wastes such as oil sludge and sludge. The special waste fluidized bed incinerator adopts a low-nitrogen combustion design, and the flue gas is desulfurized by adopting a semidry method. The emission of nitrogen oxides can meet the emission control requirements of hazardous waste incineration pollution control standard (GB 18484-2001) on the nitrogen oxides. With the increasing strictness of environmental requirements, new pollution control standards for hazardous waste incineration (GB 18484-2020) are being implemented on 7/1/2021. The standard limits the emission of nitrogen oxides from the original 500mg/m ³ The daily average value is reduced to 250mg/m ³ . The original process technology of the special waste fluidized bed incinerator can not control the nitrogen oxides within the new emission standard.

The SNCR denitration technology is low in investment cost and convenient to transform, and has been widely used for denitration of power station boilers, but has not been used for special waste fluidized bed incinerators.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a SNCR denitration technique utilizes device on special waste material fluidized bed burns burning furnace, and the device nitrogen oxide emission reduces by a wide margin when can realizing burning the discarded object.

The technical scheme of the utility model lies in: a utilization device of an SNCR denitration technology on a special waste fluidized bed incinerator comprises an incinerator body, wherein a flue gas outlet in the top of the incinerator body is connected with a horizontal flue through a slope section, the flue gas outlet is provided with a superheater, a reducing agent ammonia water injection device is installed on the horizontal flue, and a boiler, a waste heat utilization device and a flue gas treatment device are sequentially connected to the horizontal flue along a flue gas output direction.

Furthermore, the bottom of the incinerator body is a primary air chamber, the upper portion of the incinerator body is a combustion chamber, the primary air chamber is communicated with the combustion chamber through a plurality of air caps, and a discharging pipe and a coal discharging pipe are arranged on the side portion of the combustion chamber.

Furthermore, a primary air inlet is formed in the side of the primary air chamber.

Furthermore, the combustion chamber consists of an incinerator dense-phase zone at the bottom and an incinerator dilute-phase zone at the top, and a secondary air inlet is formed in the periphery of the incinerator dilute-phase zone.

Furthermore, the blanking pipe and the coal blanking pipe are both arranged on the periphery of the dense-phase area of the incinerator.

Further, reductant aqueous ammonia injection apparatus includes aqueous ammonia storage tank and oxygen removal water pitcher, aqueous ammonia storage tank and oxygen removal water pitcher are connected with the spray gun of installing on horizontal flue through mixing measurement distribution system.

Furthermore, the output end of the flue gas treatment device is connected with a chimney through an induced draft fan, and a valve is arranged on the front section of the induced draft fan.

Compared with the prior art, the utility model has the advantages of it is following:

the SNCR denitration technology is used for the special waste fluidized bed incinerator for the first time, and the emission of nitrogen oxides of the special waste fluidized bed incinerator is greatly reduced. When the SNCR denitration technology is adopted in a common coal-fired boiler, the spraying position of the reducing agent ammonia water is selected in front of a superheater, the temperature of the front section of the superheater of the special waste fluidized bed incinerator is considered to be higher than 1100 ℃, the reducing agent is not suitable for reacting with nitrogen oxide, the spraying point of the reducing agent is selected in a horizontal flue behind the superheater, on one hand, the flow rate of flue gas in the section is lower than that in the front part, the reaction time can be increased, on the other hand, the reaction temperature is about 900 ℃, and the method is suitable for carrying out denitration reaction.

Drawings

Fig. 1 is a schematic structural view of the present invention;

in the figure: 10-incinerator body 11-slope section 12-horizontal flue 13-primary air chamber 14-blast cap 15-primary air inlet 16-incinerator dense phase zone 17-incinerator dilute phase zone 18-secondary air inlet 20-superheater 30-boiler 40-waste heat utilization device 50-flue gas treatment device 60-blanking pipe 61-conveying track 62-hopper 70-blanking pipe 81-ammonia water storage tank 82-oxygen-removing water tank 83-mixing metering distribution system 84-spray gun 90-induced draft fan 91-valve 92-chimney.

Detailed Description

In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.

Refer to FIG. 1

A utilization device of an SNCR denitration technology on a special waste fluidized bed incinerator comprises an incinerator body 10, wherein a flue gas outlet at the top of the incinerator body is connected with a horizontal flue 12 through a slope section 11, a superheater 20 is arranged at the flue gas outlet, a reducing agent ammonia water injection device is installed on the horizontal flue, and a boiler 30, a waste heat utilization device 40 and a flue gas treatment device 50 are sequentially connected to the horizontal flue along a flue gas output direction, so that nitrogen oxides in flue gas react with ammonia water, and pollutant nitrogen oxides in the flue gas are discharged after reaching a discharge standard.

In this embodiment, the bottom of the incinerator body is a primary air chamber 13, the upper part is a combustion chamber, the primary air chamber is communicated with the combustion chamber through a plurality of hoods 14, and the side part of the combustion chamber is provided with a discharge pipe 60 and a coal discharge pipe 70. The discharging pipe is used for conveying dangerous wastes such as oil sludge, sludge and the like to be incinerated, and the discharging pipe is used for conveying auxiliary fire coal.

In this embodiment, a primary air inlet 15 is provided at a side portion of the primary air chamber in order to supply oxygen to the combustion chamber.

In this embodiment, the combustion chamber is comprised of a bottom incinerator dense phase zone 16 and a top incinerator dilute phase zone 17. The periphery of the dilute phase zone of the incinerator is provided with a secondary air inlet 18, so that the secondary air inlet supplies oxygen to the dilute phase zone of the incinerator.

In this embodiment, the feeding pipe and the coal feeding pipe are both disposed at the periphery of the dense-phase region of the incinerator, so as to better burn hazardous wastes such as oil sludge and assist in burning coal. The feeding pipe and the coal discharging pipe are connected with a conveying track 61, and a hopper 62 driven by a motor is arranged on the conveying track.

In this embodiment, in order to realize nitrogen oxide and aqueous ammonia reaction in the flue gas, reductant aqueous ammonia injection apparatus includes aqueous ammonia storage tank 81 and oxygen removal water pitcher 82, aqueous ammonia storage tank and oxygen removal water pitcher are connected with the spray gun 84 of installing on horizontal flue through mixing metering distribution system 83, the figure of spray gun is a plurality of, evenly lays to can cover whole flue face when spouting the aqueous ammonia.

In this embodiment, in order to better output the flue gas and control the on-off of flue gas, flue gas processing apparatus's output is connected with chimney 92 through draught fan 90, and the draught fan anterior segment is provided with valve 91.

The working principle is as follows: the flue gas burned in the incinerator body sequentially enters the slope section and the horizontal flue after passing through the heat device, and the horizontal flue is provided with a reducing agent ammonia water injection device (a plurality of spray guns are uniformly distributed on the horizontal flue). The ammonia water in the ammonia water storage tank and the deoxygenated water in the deoxygenated water storage tank are mixed after passing through a metering and distributing system, the mixture is sprayed into flue gas through a spray gun, nitrogen oxides in the flue gas react with the ammonia water, and the nitrogen oxides in the flue gas are discharged after reaching the discharge standard through a boiler and flue gas treatment devices such as a waste heat utilization device, a semi-dry desulfurization device and a dedusting device.

The above is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.

Claims

1. The utilization device of the SNCR denitration technology on the special waste fluidized bed incinerator comprises an incinerator body and is characterized in that a flue gas outlet at the top of the incinerator body is connected with a horizontal flue through a slope section, a superheater is arranged at the flue gas outlet, a reducing agent ammonia water injection device is installed on the horizontal flue, and a boiler, a waste heat utilization device and a flue gas treatment device are sequentially connected to the horizontal flue along a flue gas output direction.

2. The utilization device of the SNCR denitration technology on the special waste fluidized bed incinerator according to claim 1, characterized in that the bottom of the incinerator body is a primary air chamber, the upper part is a combustion chamber, the primary air chamber is communicated with the combustion chamber through a plurality of hoods, and the side part of the combustion chamber is provided with a feeding pipe and a coal feeding pipe.

3. The utilization device of the SNCR denitration technology on the special waste fluidized bed incinerator according to claim 2, characterized in that a primary air inlet is arranged on the side of the primary air chamber.

4. The utilization device of SNCR denitration technology on a special waste fluidized bed incinerator according to claim 2 or 3, characterized in that the combustion chamber is composed of an incinerator dense phase zone at the bottom and an incinerator dilute phase zone at the top, and a secondary air inlet is arranged at the periphery of the incinerator dilute phase zone.

5. The SNCR denitration technology utilization device of claim 4, wherein the blanking pipe and the coal discharging pipe are both arranged on the periphery of the dense-phase area of the incinerator.

6. The utilization device of the SNCR denitration technology on the special waste fluidized bed incinerator according to claim 1, 2, 3 or 5, characterized in that the reducing agent ammonia water injection device comprises an ammonia water storage tank and a deoxygenation water tank, and the ammonia water storage tank and the deoxygenation water tank are connected with a spray gun arranged on a horizontal flue through a mixing, metering and distributing system.

7. The utilization device of the SNCR denitration technology on the special waste fluidized bed incinerator according to claim 1, 2, 3 or 5, characterized in that the output end of the flue gas treatment device is connected with a chimney through an induced draft fan, and a valve is arranged at the front section of the induced draft fan.