Desulfurization system and method for flue gas of cement kiln furnace

A cement kiln and desulfurization system technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of low desulfurization efficiency of cement kilns, achieve improved desulfurization effect, high desulfurization efficiency, and convenient operation and management Effect

Active Publication Date: 2016-11-30
NANJING C HOPE ENVIRONMENTAL SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a cement kiln flue gas desulfurization system and method using ammonia water as a desulfurizer, so as to solve the technical problem of low desulfurization efficiency of cement kiln in the prior art

Method used

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  • Desulfurization system and method for flue gas of cement kiln furnace
  • Desulfurization system and method for flue gas of cement kiln furnace
  • Desulfurization system and method for flue gas of cement kiln furnace

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Embodiment 1

[0045] Such as figure 1 As shown, a cement kiln flue gas desulfurization system, the ammonia water in the tank car is transferred to the ammonia water storage tank 2 through the ammonia discharge pump 1, and the SNCR denitrification system will be built in the cement plant, using ammonia water as the reducing agent for denitrification The system will be equipped with an ammonia discharge pump and an ammonia water storage tank, so the present invention generally does not additionally provide an ammonia discharge pump 1 and an ammonia water storage tank 2 to save investment. At the outlet of the ammonia water storage tank, there is a main valve 3 for opening / stopping the ammonia water supply of the desulfurization system and a second main valve 4 for opening / stopping the ammonia water supply of the denitrification system, so as to switch the ammonia water supply of different systems at any time.

[0046] In this embodiment, the desulfurization system uses two centrifugal deliver...

Embodiment 1 comparative example 1

[0053] Embodiment one and comparative example one compare:

[0054] By comparison, the side-spray spray gun is compared with the direct-spray spray gun, and the coverage rate is increased by 9.71% compared with the direct-spray spray gun, so as to achieve the purpose of improving the efficiency of desulfurization reaction and reducing the consumption of ammonia water.

Embodiment 2

[0056] A method for desulfurization using a cement kiln flue gas desulfurization system, comprising the steps of:

[0057] Step 1, configuring 15%-25% ammonia water and transporting it to the ammonia water storage tank;

[0058] Step 2. Set the SO through the automatic control system 2 The concentration preset value, the detection device detects SO in the flue gas of the cement kiln pre-decomposition system in real time 2 Concentration, and the measured value is sent to the automatic control system, the automatic control system calculates and adjusts the injection amount of ammonia water in real time according to the deviation between the preset value and the measured value;

[0059] Step 3. According to the amount of ammonia water injection calculated in step 2, the ammonia water is pressurized by the delivery pump and then injected into the spray gun and then sprayed in the cement kiln pre-decomposition system. At the outlet, the temperature at the outlet of the second-sta...

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Abstract

The invention relates to a desulfurization system and method for flue gas of a cement kiln furnace. The desulfurization system comprises an ammonia water storing tank, conveying pumps, spraying guns, a cement decomposing furnace, a cement kiln pre-decomposing system and an automatic control system, wherein the cement kiln pre-decomposing system comprises a multi-stage pre-heater; the ammonia water storing tank communicates with the spraying guns through the conveying pumps; and spraying points of the spraying guns are located at an outlet of a cyclone barrel of a second-stage pre-heater. The desulfurization method comprises the following steps of I, preparing a 15-25% ammonia water; II, performing real-time detection on the concentration of SO2, and according to the concentration of the SO2 in flue gas, calculating and adjusting the spraying amount of the ammonia water through the automatic control system; and III, according to the spraying amount of the ammonia water, which is obtained through calculation in the step II, injecting the ammonia water which is pressurized through the conveying pumps to the spraying guns, and spraying the ammonia water into the cement kiln pre-decomposing system, wherein the spraying points of the spraying guns are located at the outlet of the cyclone barrel of the second-stage pre-heater. According to the desulfurization system and method disclosed by the invention, the desulfurization efficiency can reach 95% or above, the desulfurization efficiency is high, the ammonia-sulfur ratio is 2-2.5, and the operating cost is low.

Description

Technical field: [0001] The invention belongs to the technical field of flue gas desulfurization of cement kilns, and in particular relates to a system and method for flue gas desulfurization of cement kilns using ammonia water as a desulfurizing agent. Background technique [0002] Coal-fired facilities such as thermal power plants, steel mills, industrial boilers, and cement plants will produce a large amount of sulfur dioxide in the production process. Sulfur dioxide will be oxidized into sulfuric acid mist or sulfate aerosol in the atmosphere, which is an important precursor of acid rain. Most thermal power plants, steel mills, and industrial boilers are equipped with desulfurization facilities. Since most of the sulfur produced in cement plants will be absorbed by calcium oxide, the concentration of sulfur dioxide emission is not high, and most production lines can meet the standard requirements. However, in some factories, the sulfur content of raw materials is too hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
CPCB01D53/502B01D53/504B01D53/78B01D2251/2062B01D2258/0233B01D2258/0283
Inventor 巫世财刘栋梁吴德利
Owner NANJING C HOPE ENVIRONMENTAL SCI & TECH
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