CN214486350U - New forms of energy power plant NOx minimum discharge system - Google Patents

Abstract

The utility model provides an ultra-low discharge system of new forms of energy power factory NOx, it includes: an SNCR injection system; a PNCR spray system; and carrying out in-furnace denitration on the flue gas discharged by the incineration boiler by using a reducing agent so as to remove nitrogen oxides in the flue gas. Meanwhile, a PNCR denitration process is combined and added in the furnace, and the aim of ultralow NOx emission of the waste incineration power plant is fulfilled.

Description

New forms of energy power plant NOx minimum discharge system

Technical Field

The utility model relates to a waste incineration flue gas treatment technology particularly relates to a flue gas NOx clean system.

Background

Acid rain formed by acid gas discharged by a power plant seriously harms the living environment of human beings, so a flue gas denitration device is required to be installed in a thermal power plant. At present, the waste incineration power plant mainly carries out flue gas denitration treatment through an SNCR system, but along with the flue gas emission standard is stricter and stricter, denitration treatment is carried out by a more efficient technology. In addition, although denitration treatment is performed through the SNCR system, denitration efficiency is low, and the combined denitration of the SCR system is increased to realize ultralow NOx emission, investment and operation cost is high.

On the other hand, the PNCR denitration technology has simple process system and low investment and operation cost, adopts the high-molecular denitration agent to spray in the furnace, has the denitration efficiency far higher than that of the prior SNCR process, and has the NOx removal rate up to 80 percent when being singly used.

The PNCR and SNCR combined denitration technology is simple in process system and low in investment and operation cost, the denitration efficiency is far higher than that of the existing SNCR process, and the NOx removal rate is up to 75% by combined use.

SUMMERY OF THE UTILITY MODEL

In order to solve above-mentioned problem at least partially, the utility model discloses a new forms of energy power plant NOx minimum discharge system for get rid of the nitrogen oxide that contains in the flue gas, its system includes:

an SNCR injection system;

in the SNCR injection system, a conventional ammonia/urea solution 11 is discharged to an ammonia/urea solution tank 12 and is conveyed as a denitration agent through an ammonia conveying pump 16. The demineralized water 20 enters the water tank 14, under the action of a dilution water pump 17, the solution is diluted to 5% -8% of denitration agent by a mixer 19, the denitration agent is sprayed into the incinerator 18 through an SNCR spray gun 15, the solution is atomized under the action of compressed air 13, and the denitration agent and NOx in the flue gas are mixed and reacted in the incinerator 18 to achieve the purpose of denitration;

a PNCR spray system;

the PNCR injection system: the polymer denitration agent enters the storage bin 2 through the vacuum feeding device 1, then enters the conveying pipeline to the material distributor 6 and 8 through the Venturi mixer 4 under the action of the Roots blower 3, and finally is sprayed into the incinerator 9 through the on-path spray gun 7 to react with NOx in flue gas to achieve the denitration purpose, wherein the compressed air 5 is used for preventing the spray gun from being blocked by timing injection.

The SNCR system uses urea/ammonia water to spray in the furnace at 860-1150 ℃ to realize the NOx removal effect.

The PNCR system uses a high molecular denitration agent/urea intermediate material/high molecular ammonia source substance, and sprays the substances in a furnace at 800-950 ℃ to realize the NOx removal effect.

Further, an SNCR process and a PNCR process are simultaneously used, and the aim of ultralow NOx emission is achieved through combined denitration.

Further, PNCR lances are typically placed downstream of the smoke side of SNCR lances.

Furthermore, in the system, the number of the SNCR spray guns in a single furnace is 8-20 rods.

Furthermore, in the system, the number of the PNCR spray guns in a single furnace is 6-20.

Drawings

The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. The embodiments of the present invention and the description thereof are illustrated in the accompanying drawings for the purpose of explaining the process flow of the present invention.

In the drawings:

fig. 1 shows a schematic diagram of a flue gas NOx purification system PNCR.

A schematic diagram of a flue gas NOx purification system SNCR is shown in fig. 2.

Fig. 3 is a schematic diagram showing the arrangement structure of a spray gun of the PNCR and SNCR combined denitration process.

Description of reference numerals:

FIG. 1: 1. vacuum feeding, a bin 2, a roots blower 3, a venturi mixer 4, compressed air 5, a material distributor 6, a PNCR spray gun 7, a material distributor 8 and an incinerator 9.

FIG. 2: 11. ammonia water discharge, 12 ammonia water tanks, 13 process air, 14 water tanks, 15 SNCR spray guns, 16 ammonia water delivery pumps, 17 dilution water pumps, 18 incinerator, 19 mixer and 20 demineralized water.

FIG. 3: SNCR spray gun, 22.SNCR spray gun, 23.SNCR spray gun, 24.SNCR spray gun, 25.SNCR spray gun, 26.SNCR spray gun, 27.SNCR spray gun, 28.SNCR spray gun, 29.PNCR spray gun, 30.PNCR spray gun, 31.PNCR spray gun, 32.PNCR spray gun, 33.PNCR spray gun, 34.PNCR spray gun, 35.PNCR spray gun, 36.PNCR spray gun, 37.PNCR spray gun, 38.PNCR spray gun, 39.PNCR spray gun, 40.PNCR spray gun, 41.PNCR spray gun, 42.PNCR spray gun.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring embodiments of the present invention.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the invention are possible in addition to these detailed descriptions.

In order to thoroughly understand the embodiment, detailed structures and steps will be provided in the following description so as to explain the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the present invention are possible in addition to the detailed description below.

The flue gas purification system using the new embodiment will be described with reference to fig. 1, 2 and 3.

The flue gas purification system that this embodiment provided is arranged in handling NOx in the flue gas that waste incineration power plant incineration boiler produced to reduce environmental pollution, discharges to the atmosphere through the chimney after flue gas processing system handles.

The schematic diagram in figure 1 is PNCR schematic diagram, and polymer denitration agent gets into feed bin 2 through vacuum loading attachment 1, then under roots's fan 3 effect, gets into conveying line to material distributor 6, 8 through venturi mixer 4, through on-the-way spray gun 7 at last, spouts the medicament into burning furnace 9 and NOx mixed reaction in the flue gas and reaches the purpose of denitration, and wherein compressed air 5 prevents the spray gun effect of blockking up for regularly jetting.

In fig. 2, which is a schematic SNCR diagram, a conventional ammonia/urea solution 11 is discharged to an ammonia/urea solution tank 12 and is delivered as a denitration agent by an ammonia delivery pump 16. The demineralized water 20 enters the water tank 14, under the action of the dilution water pump 17, the solution is diluted to 5% -8% of denitration agent by the mixer 19, the denitration agent is sprayed into the incinerator 18 through the SNCR spray gun 15, the solution is atomized under the action of the compressed air 13, and the denitration agent and NOx in the flue gas are mixed and reacted in the incinerator 18 to achieve the purpose of denitration.

Fig. 3 is a schematic diagram illustrating the arrangement structure of a PNCR and SNCR combined denitration process spray gun, wherein the PNCR spray gun is generally arranged at the downstream of the flue gas side of the SNCR spray gun, and the requirement on the reaction temperature is low. In the figure, 21, 22, 23, 24, 25, 26, 27 and 28 are SNCR spray guns, and 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 and 42 are PNCR spray guns. The practical application number of the SNCR and PNCR spray guns is as follows: the number of the SNCR spray guns in a single furnace is 8-20; the number of the PNCR spray guns is 6-20 per furnace.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "disposed" and the like as used herein may refer to one component being directly attached to another component or one component being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention, all of which are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (2)

1. An ultra-low emission system of NOx in a new energy power plant is used for removing nitrogen oxides contained in flue gas, and is characterized by comprising the following components:

an SNCR injection system;

in the SNCR injection system, an ammonia water/urea solution is connected to an ammonia water/urea solution tank and is conveyed to a mixer through an ammonia water conveying pump; the desalted water is connected into a water tank and is conveyed to the mixer through a dilution water pump; the mixer is communicated with the SNCR spray gun, and the denitration agent is sprayed into the incinerator through the SNCR spray gun; atomizing the solution under the action of compressed air, and mixing and reacting the atomized solution with NOx in the flue gas in an incinerator;

a PNCR spray system;

the PNCR injection system: the polymer denitration agent is connected with the storage bin through a vacuum feeding device, is connected with the conveying pipeline to the material distributor through the Venturi mixer under the action of the Roots blower, and is sprayed into the incinerator through the spray gun to react with NOx in the flue gas for denitration;

the spray guns are PNCR spray guns and SNCR spray guns; the PNCR lance is positioned downstream of the SNCR lance smoke side.

2. The ultra-low NOx emission system of the new energy power plant of claim 1, wherein the number of SNCR spray guns for each furnace is 8-20 rods; the number of the PNCR spray guns is 6-20 per furnace.

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