1) How it works

在電控單元的控制下, 尿素泵將尿素溶液從尿素罐中抽出, 計量、加壓后送到雙流體霧化噴槍, 壓縮空氣經(jīng)控制單元調壓后也送到計量噴槍,噴射閥打開(kāi)后, 尿素在壓縮空氣的引射作用下噴出,和壓縮空氣混合后經(jīng)噴嘴霧化后噴入排氣管道。電控單元根據廢氣流量、催化劑的溫度和NOX濃度精確計算出所需的尿素溶液噴射量, 發(fā)出相應的脈寬調制信號給計量泵, 計量泵根據信號對尿素溶液進(jìn)行計量, 從而保證時(shí)刻精確的尿素溶液噴射到排氣管道。

Under the control of the electronic control unit, the urea solution is pumped out of the urea tank by the urea pump, measured and pressurized, and then sent to the dual flow atomizing spray gun. The compressed air is also sent to the metering spray gun after the pressure is regulated by the control unit. After the injection valve is opened, the urea is ejected under the injection effect of the compressed air, and mixed with the compressed air, it is atomized by the nozzle and then injected into the exhaust pipe. The electronic control unit accurately calculates the required injection amount of urea solution according to the exhaust gas flow, catalyst temperature and NOx concentration, sends the corresponding pulse width modulation signal to the metering pump, and the metering pump measures the urea solution according to the signal, so as to ensure the accurate injection of urea solution to the exhaust pipe at any time.

尿素溶液在排氣管道混合區遇高溫煙氣分解成氨氣（NH3） 和水（H2O）, 與煙氣充分混合后進(jìn)入催化劑模塊, 在催化反應區NH3 和NOX反應生成無(wú)害的氮氣(N2)和水(H2O), 更終通過(guò)排氣管道排到大氣中。

The urea solution is decomposed into ammonia (NH3) and water (H2O) in the mixing zone of exhaust pipe in case of high temperature flue gas. After being fully mixed with the flue gas, it enters the catalyst module. In the catalytic reaction zone, NH3 and NOx react to generate harmless nitrogen (N2) and water (H2O), and finally it is discharged into the atmosphere through the exhaust pipe.

尿素溶液分解如下：CO(NH2)2 + H2O = 2NH3 + CO2 尿素經(jīng)熱解、水解生成氨氣，為反應提供原料。

The decomposition of urea solution is as follows: CO (NH2) 2 + H2O = 2nh3 + CO2. Urea is pyrolyzed and hydrolyzed to produce ammonia, which provides raw material for the reaction.

2)工藝流程

2) Process flow

發(fā)電機組煙氣經(jīng)過(guò)排氣管道進(jìn)入凈化系統，尾氣中的NOX通過(guò)煙氣脫硝系統時(shí),與氨氣充分混合后的廢氣發(fā)生催化還原反應，將NOX還原為無(wú)害的N2和H2O。

The flue gas of the generator set enters the purification system through the exhaust pipe. When the NOx in the tail gas passes through the flue gas denitration system, the catalytic reduction reaction takes place in the exhaust gas fully mixed with ammonia, which reduces NOx to harmless N2 and H2O.

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3)煙氣脫硝系統性能指標：

3) Performance index of flue gas denitration system:

脫硝后，煙氣中的NOX濃度不高于50mg/Nm3；

After denitration, the concentration of NOx in flue gas is not higher than 50mg / Nm3;

煙氣脫硝系統氨逃逸控制在5ppm以下；

The ammonia escape of flue gas denitration system is controlled below 5ppm;

單臺發(fā)電機組的尿素溶液耗量不大于2.5L/h（溶液濃度為40%）；

The urea solution consumption of a single generator unit is not more than 2.5 L / h (solution concentration is 40%);

煙氣脫硝系統的整體阻力不影響煙氣的正常排出，系統背壓一般小于1.5KPa；

The overall resistance of the flue gas denitration system does not affect the normal discharge of flue gas, and the back pressure of the system is generally less than 1.5kpa;

脫硝系統結構簡(jiǎn)單、無(wú)副產(chǎn)物、運行方便、可靠性高、脫硝效率高、一次投資相對較低；

The denitration system has the advantages of simple structure, no by-products, convenient operation, high reliability, high denitration efficiency and relatively low primary investment;

自動(dòng)化程度高，可靠性好；

High degree of automation, good reliability;

該系統組合小巧，連接簡(jiǎn)約快捷，耐腐蝕性強，整體性能優(yōu)良。

The combination of the system is small, the connection is simple and fast, the corrosion resistance is strong, and the overall performance is excellent.

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Today's wonderful content is provided by gas generator set. We sincerely provide you with satisfactory service. If you have any questions or questions, please call us or enter our website: http://m.elmasticar.com