CN206027446U

CN206027446U - SNCR and SCR unite denitrification facility

Info

Publication number: CN206027446U
Application number: CN201620985484.4U
Authority: CN
Inventors: 陈先亮; 孙守山
Original assignee: Yuan Yuan Design Institute Co Ltd
Current assignee: Yuan Yuan Design Institute Co Ltd
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2017-03-22
Anticipated expiration: 2026-08-30

Abstract

The utility model discloses a SNCR and SCR unite denitrification facility belongs to waste gas pollution control and treatment technical field. It includes cyclone, reductant storage conveying system, dilution water system, measurement distribution system, reductant injection system and the SCR system that is connected with the boiler, the reductant store conveying system with the dilution water system with the measurement distribution system is connected, the measurement distribution system with the reductant injection system be connected, be equipped with the compressed air entry on the reductant injection system, the SCR system includes the SCR catalyst of 300~420 DEG C of regional settings of boiler afterbody heat -transfer surface. The utility model discloses can reduce the first investment cost of flue gas denitration device, the operation maintenance is simple.

Description

A kind of SNCR and SCR combined denitrations device

Technical field

This utility model is related to a kind of SNCR and SCR combined denitrations device, belongs to waste gas pollution control and treatment technical field.

Background technology

At present, as the environmental protection standard of China requires that more and more strictly the Air Pollutant Emission Index of China is increasingly tight Lattice, by taking nitrogen oxides as an example, from 1000mg/Nm several years ago³The discharge standard of left and right, 100mg/Nm up till now³Discharge standard Require, or even 50mg/Nm is strictly arrived in key area³, illustrate invariably the pay attention to day by day of Environmental protection.

Gas denitrifying technology main in the world at present is divided into three major types, is respectively：SCR technique (SCR), SNCR technique (SNCR), oxidative absorption technique.From the point of view of these three techniques, SCR Method initial cost highest, the lowest coursing cost, denitration effect are best；Oxidation technology initial cost is higher, operating cost highest；Selectivity Non-catalytic reduction technique initial cost is minimum, and operating cost is higher, runs most stable, and for the specific type of furnace, denitration effect can be with Reach high level.

For amount of nitrogen oxides is more than 500mg/Nm³Pulverized-coal fired boiler for, be most reasonable using SCR denitration technique , and for amount of nitrogen oxides is in 100～400mg/Nm³For the CFBB of left and right, using SNCR denitration work Skill is unable to reach 50mg/Nm³Newest environmental requirement, and adopt SCR denitration technology investment uneconomical.

Utility model content

For drawbacks described above present in prior art, this utility model can reduce equipment for denitrifying flue gas there is provided one kind Initial cost cost, the simple SNCR and SCR combined denitrations device of operation maintenance.

This utility model is achieved by the following technical solution：A kind of SNCR and SCR combined denitrations device, it is described Closing denitrification apparatus includes that the cyclone separator being connected with boiler, reducing agent Storing and conveying system, dilution water system, metering are distributed System, reductant injection system and SCR system, the reducing agent Storing and conveying system and the dilution water system and the meter Amount distribution system is connected, and the metering distribution system is connected with the reductant injection system, the reducing agent injection system System is provided with compressed air inlet, and the SCR system includes the SCR catalysis that 300～420 DEG C of regions of boiler tail heat-transfer surface are arranged Agent.

Further, the SCR catalyst is 1 layer or 2 layers.

Further, the reducing agent in reducing agent Storing and conveying system is carbamide or ammonia.

Further, the reducing agent Storing and conveying system includes ammonia water tank and ammonium hydroxide delivery pump.

Further, the dilution water system includes diluting water tank and dilution water pump.

Further, the metering distribution system includes static mixer and pipeline valve system I.

Further, the reductant injection system includes twin spray gun and pipeline valve system II.

When this utility model carries out denitration, reducing agent enters metering distribution system, dilution from reducing agent Storing and conveying system Water enters metering distribution system from dilution water system, is uniformly mixed to form certain density reducing agent molten in static mixer Liquid, adjusts regulating valve so that the ammonia spirit after static mixer is diluted between 0%～20%, and reductant solution is in compression Being sprayed into from the SNCR temperature windows of boiler by reductant injection system under air atomizing effect carries out SNCR denitration, and SNCR systems are escaped The SCR catalyst that the ammonia that effusion comes is arranged through 300～420 DEG C of regions of boiler tail heat-transfer surface, carries out SCR denitration.Using escaping Ammonia source of the ease ammonia as SCR system, it is lower than pure SNCR techniques the escaping of ammonia, heat exchange of the ammonium hydrogen sulfate to afterbody heat-transfer surface can be reduced Affect；The ammonia or urea liquid droplet that twin spray gun sprays has certain initial velocity, uniformly can divide rapidly It is dispersed in boiler smoke, good SNCR regions denitration efficiency can be reached, the ammonia in SCR region domain can be mixed with flue gas again It is even, reduce amount of ammonia slip.It follows that SNCR and SCR combined denitrations device described in the utility model is de- with traditional SNCR Nitre technique is compared, and has the advantages that denitration efficiency is high, amount of ammonia slip is low, operating cost is low, with traditional SCR denitration technique phase Than, operation maintenance simple advantage low with initial cost.

Description of the drawings

Fig. 1 is the structural representation of SNCR and SCR combined denitrations device described in this utility model embodiment；

In figure, 1, boiler, 2, cyclone separator, 3, compressed air, 4, ammonia water tank, 5, ammonium hydroxide delivery pump, 6, dilution water tank, 7th, dilute water pump, 8, static mixer, 9, twin spray gun, 10, regulating valve, 11, cleaner unit, 12, air-introduced machine, 13, cigarette Gas is exported.

Specific embodiment

Below by indefiniteness embodiment and combine accompanying drawing this utility model be further described：

This utility model embodiment provides a kind of SNCR and SCR combined denitrations device, and the combined denitration device includes The cyclone separator 2 that is connected with boiler 1, reducing agent Storing and conveying system, dilution water system, metering distribution system, reducing agent Spraying system and SCR system, the reducing agent Storing and conveying system and the dilution water system and the metering distribution system It is connected, the metering distribution system is connected with the reductant injection system, and the reductant injection system is provided with pressure The entrance of contracting air 3, the SCR system include the SCR catalyst that 300～420 DEG C of regions of boiler tail heat-transfer surface are arranged.Fig. 1 In the direction of arrow for flue gas circulating direction.

Further, the SCR catalyst is 1 layer or 2 layers.

Further, the reducing agent Storing and conveying system includes ammonia water tank 4 and ammonium hydroxide delivery pump 5.

Further, the dilution water system includes diluting water tank 6 and dilution water pump 7.

Further, the metering distribution system includes static mixer 8 and pipeline valve system I.

Further, the reductant injection system includes twin spray gun 9 and pipeline valve system II.

When this utility model carries out denitration, reducing agent enters metering distribution system, dilution from reducing agent Storing and conveying system Water enters metering distribution system from dilution water system, is uniformly mixed to form certain density reducing agent molten in static mixer 8 Liquid, adjusts regulating valve 10 so that the ammonia spirit after static mixer is diluted between 0%～20%, and reductant solution is in pressure Being sprayed into from the SNCR temperature windows of boiler by reductant injection system under the effect of contracting air atomizing carries out SNCR denitration, SNCR systems The SCR catalyst that the ammonia for escaping is arranged through 300～420 DEG C of regions of boiler tail heat-transfer surface, carries out SCR denitration.Utilize Ammonia source of the escape ammonia as SCR system, it is lower than SNCR technique the escaping of ammonia, heat exchange of the ammonium hydrogen sulfate to afterbody heat-transfer surface can be reduced Affect.The ammonia or urea liquid droplet that twin spray gun sprays has certain initial velocity, uniformly can divide rapidly It is dispersed in boiler smoke, good SNCR regions denitration efficiency can be reached, the ammonia in SCR region domain can be mixed with flue gas again It is even, reduce amount of ammonia slip.It follows that SNCR and SCR combined denitrations device described in the utility model is de- with traditional SNCR Nitre technique is compared, and has the advantages that denitration efficiency is high, amount of ammonia slip is low, operating cost is low, with traditional SCR denitration technique phase Than, operation maintenance simple advantage low with initial cost.

Preferred embodiment of the present utility model is the foregoing is only, it is not to limit this utility model, all at this Any modification, equivalent substitution and improvements done within the spirit and principle of utility model etc., should be included in of the present utility model Within protection domain.

Claims

1. a kind of SNCR and SCR combined denitrations device, it is characterised in that the combined denitration device includes what is be connected with boiler Cyclone separator, reducing agent Storing and conveying system, dilution water system, metering distribution system, reductant injection system and SCR systems System, the reducing agent Storing and conveying system and the dilution water system are connected with the metering distribution system, the metering point Match system is connected with the reductant injection system, and the reductant injection system is provided with compressed air inlet, the SCR System includes the SCR catalyst that 300～420 DEG C of regions of boiler tail heat-transfer surface are arranged.

2. SNCR and SCR combined denitrations device according to claim 1, it is characterised in that the SCR catalyst is 1 layer Or 2 layers.

3. SNCR and SCR combined denitrations device according to claim 1, it is characterised in that reducing agent Storing and conveying system Interior reducing agent is carbamide or ammonia.

4. SNCR and SCR combined denitrations device according to claim 1, it is characterised in that the reducing agent Storing and conveying System includes ammonia water tank and ammonium hydroxide delivery pump.

5. SNCR and SCR combined denitrations device according to claim 1, it is characterised in that the dilution water system includes Dilution water tank and dilution water pump.

6. SNCR and SCR combined denitrations device according to claim 1, it is characterised in that the metering distribution system bag Include static mixer and pipeline valve system I.

7. SNCR and SCR combined denitrations device according to claim 1, it is characterised in that the reductant injection system Including twin spray gun and pipeline valve system II.