CN-224208275-U - SNCR denitration automatic control system

CN224208275UCN 224208275 UCN224208275 UCN 224208275UCN-224208275-U

Abstract

The utility model discloses an SNCR denitration automatic control system which comprises an ammonia water storage and supply system, a desalted water system, a control system, a metering mixing system, a fire-fighting spraying and ammonia leakage alarming system and a distribution spraying system, wherein the ammonia water storage and supply system comprises an ammonia water storage tank, the desalted water system comprises a desalted water tank, the inlet end of the ammonia water storage tank is connected with an ammonia water main pipe electric switch valve, the outlet end of the ammonia water storage tank is connected with an inlet end of an ammonia water conveying pump, the outlet end of the ammonia water conveying pump is connected with the metering mixing system, the inlet end of the desalted water tank is connected with an inlet end of the desalted water conveying pump, the outlet end of the desalted water conveying pump is connected with the metering mixing system, and the mixed liquid can be fully and accurately and efficiently sprayed into a hearth, so that manpower and resources are saved, the production efficiency is improved, and the enterprise cost is reduced.

Inventors

ZHANG HAIDA
QI WEI
LIU LI
JIANG HETUAN
ZHENG XUEJUN
MEN TONGTAO

Assignees

济南国能环境工程有限公司

Dates

Publication Date: 20260508
Application Date: 20250428

Claims (9)

1. The SNCR denitration automatic control system is characterized by comprising an ammonia water storage and supply system, a desalted water system, a control system, a metering and mixing system, a fire-fighting spraying and ammonia gas leakage alarm system and a distribution injection system, wherein the ammonia water storage and supply system comprises an ammonia water storage tank; The system comprises an ammonia water storage tank, an ammonia water main pipe electric switch valve, a salt removal water tank, a salt removal water distribution injection system, a salt removal water pump and a metering mixing system, wherein the inlet end of the ammonia water storage tank is connected with the ammonia water main pipe electric switch valve, the outlet end of the ammonia water storage tank is connected with the inlet end of the ammonia water delivery pump, the outlet end of the ammonia water delivery pump is connected with the metering mixing system, the outlet end of the metering mixing system is connected with a metering mixing outlet mass flowmeter, and the metering mixing outlet mass flowmeter is connected with the distribution injection system; The distribution injection system comprises a free telescopic double-fluid spray gun and a spray gun dilute ammonia water electric regulating valve, wherein a plurality of free telescopic double-fluid spray gun and spray gun dilute ammonia water electric regulating valves are arranged at intervals, the free telescopic double-fluid spray gun is connected with the spray gun dilute ammonia water electric regulating valve, and the free telescopic double-fluid spray gun is connected with a draught fan.
2. The SNCR denitration automatic control system of claim 1, wherein an ammonia water storage tank liquid level gauge is arranged on the ammonia water storage tank, an ammonia water pump outlet backflow electric regulating valve is arranged at one end of the ammonia water storage tank, one end of the ammonia water pump outlet backflow electric regulating valve is connected with the ammonia water storage tank, and the other end of the ammonia water pump outlet backflow electric regulating valve is connected with an outlet end of an ammonia water delivery pump.
3. The automatic control system for SNCR denitration according to claim 2, wherein an outlet end of the ammonia water delivery pump is provided with an ammonia water pump outlet pressure sensor, and the ammonia water pump outlet reflux electric regulating valve controls the ammonia water pump outlet pressure sensor.
4. The SNCR denitration automatic control system according to claim 1 is characterized in that a desalination water tank liquid level meter is arranged on the desalination water tank, a desalination water pump outlet backflow electric regulating valve is arranged at one end of the desalination water tank, one end of the desalination water pump outlet backflow electric regulating valve is connected with the desalination water tank, and the other end of the desalination water pump outlet backflow electric regulating valve is connected with an outlet end of the desalination water conveying pump.
5. The automatic SNCR denitration control system according to claim 4, wherein a demineralized water pump outlet pressure sensor is arranged at an outlet end of the demineralized water delivery pump, and the demineralized water pump outlet reflux electric control valve controls the demineralized water pump outlet pressure sensor.
6. The automatic control system for SNCR denitration according to claim 1, wherein the metering and mixing system comprises a metering and mixing demineralized water vortex shedding flowmeter, a metering and mixing demineralized water electric regulating valve, a metering and mixing ammonia water electromagnetic flowmeter and a metering and mixing strong ammonia water electric regulating valve; The metering mixed demineralized water vortex shedding flowmeter is connected with the metering mixed demineralized water electric regulating valve, the outlet end of the metering mixed demineralized water electric regulating valve is connected with the metering mixed outlet mass flowmeter, and the metering mixed ammonia water electromagnetic flowmeter and the metering mixed concentrated ammonia water electric regulating valve are connected.
7. The automatic SNCR denitration control system as set forth in claim 1, wherein the distribution injection system is connected with an outlet end of a compressed air main pipe electric regulating valve, an inlet end of the compressed air main pipe electric regulating valve is connected with a compressed air pipeline, and a compressed air main pipe pressure sensor is arranged on a pipeline connected with the compressed air main pipe electric regulating valve and the distribution injection system.
8. The automatic control system for SNCR denitration according to claim 1, wherein the fire-fighting spraying and ammonia leakage alarm system comprises an ammonia leakage alarm instrument, a fire-fighting water main pipe electric switch valve, an ammonia water storage tank spraying coil pipe and a water mist spray head; The ammonia water storage tank is provided with an ammonia leakage alarm, the ammonia leakage alarm is electrically connected with the fire water main pipe electric switching valve, the fire water main pipe electric switching valve is arranged on the fire water pipe, and the ammonia leakage alarm and the fire water main pipe electric switching valve are electrically connected with the control system.
9. The automatic SNCR denitration control system according to claim 1, wherein the control system is electrically connected to an ammonia slip on-line monitoring analyzer.

Description

SNCR denitration automatic control system Technical Field The utility model belongs to the technical field of flue gas treatment, and particularly relates to an SNCR denitration automatic control system. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. Nitrogen oxides in atmospheric pollutants are easily influenced by atmospheric acid rain and photochemical smog, so that the greenhouse effect of an ozone layer is damaged to a certain extent, and serious harm is brought to the natural environment and human health. In recent years, the total amount of NOx emission is high, the coal-fired power plant is the industry with the largest NOx emission, and 60% of NOx in the atmospheric pollutants is obtained by burning coal, wherein the coal consumption of the thermal power plant accounts for 70% of the coal consumption. Therefore, a denitration system is needed to be adopted for the boiler of the thermal power plant, so that NOx emission is comprehensively propelled, and the emission amount of NOx is controlled. The denitration technology commonly used in the market at present comprises a selective non-catalytic reduction reaction (SNCR) and a selective catalytic reduction reaction (SCR), and an SNCR/SCR combined flue gas denitration technology developed on the basis of the selective non-catalytic reduction reaction (SNCR) and the selective catalytic reduction reaction (SCR). The most widely applied selective non-catalytic reduction denitration technology belongs to SNCR (selective non-catalytic reduction) denitration technology, and is a denitration method for reducing nitrogen oxides in flue gas into harmless nitrogen and water by using a reducing agent under the condition of no catalyst. The method comprises the steps of firstly spraying a reducing agent containing amino into a proper temperature area in a hearth. At high temperature, the reducing agent is rapidly decomposed into ammonia and reacts with nitrogen oxides in the flue gas in a reduction way to generate nitrogen and water. The inventor finds that the SNCR denitration process can not realize full-automatic operation in practical application, and needs manual intervention including starting and stopping a delivery pump, adjusting flow, disassembling and assembling a spray gun and the like, so that manpower is consumed, and if errors and deviations in operation occur, the SNCR denitration effect can be influenced, and thus environmental protection indexes of enterprises are influenced. Disclosure of utility model Aiming at the problems, the SNCR denitration automatic control system provided by the utility model can be fully automated, can mix ammonia water and desalted water efficiently and accurately, and can accurately and efficiently spray the mixed liquid into a hearth, so that manpower and resources are saved, the production efficiency is improved, and the enterprise cost is reduced. In order to achieve the above purpose, the present utility model adopts the following technical scheme: An SNCR denitration automatic control system comprises an ammonia water storage and supply system, a desalted water system, a control system, a metering and mixing system, a fire-fighting spraying and ammonia gas leakage alarm system and a distribution injection system, wherein the ammonia water storage and supply system comprises an ammonia water storage tank; The inlet end of the desalination water tank is connected with the inlet end of the desalination water main pipe electric switch valve, the outlet end of the ammonia water tank is connected with the inlet end of the ammonia water delivery pump, the outlet end of the ammonia water delivery pump is connected with the metering mixing system, the inlet end of the desalination water tank is connected with the desalination water main pipe electric switch valve, the outlet end of the desalination water tank is connected with the inlet end of the desalination water delivery pump, the outlet end of the desalination water delivery pump is connected with the metering mixing system, the outlet end of the metering mixing system is connected with the metering mixing outlet mass flowmeter, and the metering mixing outlet mass flowmeter is connected with the distribution injection system. Furthermore, an ammonia water storage tank liquid level gauge is arranged on the ammonia water storage tank, an ammonia water pump outlet backflow electric regulating valve is arranged at one end of the ammonia water storage tank, one end of the ammonia water pump outlet backflow electric regulating valve is connected with the ammonia water storage tank, and the other end of the ammonia water pump outlet backflow electric regulating valve is connected with the outlet end of the ammonia water conveying pump. Furthermore, an ammonia water pump outlet pressure sensor is arranged at the outlet end of the ammonia water conveying pump, and