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Method and apparatus for cement rotary kiln flue gas denitration and desulfurization

A cement rotary kiln and denitrification technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as difficult simultaneous denitrification and desulfurization, no emission reduction effect, etc., and achieve the effect of simple operation

Active Publication Date: 2015-02-18
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above methods can only reduce part of nitrogen oxides in the cement production process, and for SO 2 It has no emission reduction effect, and it is difficult to achieve simultaneous denitrification and desulfurization in high-sulfur cement kiln flue gas. Therefore, in order to meet new environmental standards and industrial needs, develop a x , SO 2 The process and equipment are particularly important

Method used

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  • Method and apparatus for cement rotary kiln flue gas denitration and desulfurization
  • Method and apparatus for cement rotary kiln flue gas denitration and desulfurization

Examples

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Embodiment 1

[0035] A process for simultaneous denitrification and desulfurization of flue gas from a cement rotary kiln, such as figure 1 As shown, it includes a cement clinker production system and a denitrification and sulfur-fixing agent injection system. The cement clinker production system consists of a rotary kiln 5, a precalciner 3-4, a fifth-stage preheater 6, and a fourth-stage preheater 7. The third-stage preheater 8 and the second-stage preheater 9 are composed of the first-stage preheater 10, the cooler 11, and the tertiary air pipe 12; The tank 2-1 is sent to the electronic flowmeter 3-1 of the primary denitrification and sulfur-fixing agent and the electronic flowmeter 3-2 of the secondary denitrification and sulfur-fixing agent. Enter the primary denitrification and sulfur-fixing agent spray gun 3-6 with atomizing nozzle and the secondary denitrification and sulfur-fixing agent spray gun 3 with atomizing nozzle respectively through the primary one-way check valve 3-8 and th...

Embodiment 2

[0037] A device for simultaneous denitrification and desulfurization of flue gas from a cement rotary kiln, such as figure 2 As shown: the device includes denitration and sulfur fixing agent preparation system 1, denitration and sulfur fixing agent storage system 2, denitration and sulfur fixing agent injection system 3 and automatic control system 4, wherein, denitration and sulfur fixing agent preparation system 1, denitration and sulfur fixing agent storage The system 2 is sequentially connected with the denitration and sulfur fixing agent injection system 3; the automatic control system 4 is respectively connected with the denitration and sulfur fixing agent preparation system 1 and the denitration and sulfur fixing agent injection system 3.

[0038] Denitrification and sulfur-fixing agent preparation system 1 includes reducing agent storage tank 1-1, sulfur-fixing agent storage tank 1-2, reducing agent weighing feeder 1-3, sulfur-fixing agent weighing feeder 1-4, mixing a...

Embodiment 3

[0045] See figure 1 , figure 2 , taking the simultaneous denitrification and desulfurization of flue gas from a 2500t / d cement rotary kiln as an example, the total flue gas volume is about 30×10 4 N m 3 / h, NO x The content is 700mg / m 3 , SO 2 The content is 500mg / m 3 , that is, NO emission per hour x 210kg, SO 2 150kg. Take the molar ratio NH 3 : NO x =0.8︰1, sulfur-fixing agent cation M︰SO 2 =1:1 ratio, the demand for reducing agent urea is 109kg / h respectively.

[0046] (1) The automatic control system 4 transfers 125kg of urea from the reductant storage tank 1-1 by controlling the reductant weighing feeder 1-3, and controls the sulfur fixing agent weighing feeder 1-4 to transfer 75.2kg of powdered CaO, 78.3kg powdered Mg(OH) 2 Transport from the sulfur-fixing agent storage tank 1-2 to the mixing and dissolving tank 1-5, simultaneously control the desalinated water electronic flowmeter 1-8, input 221.5kg of desalinated water through the desalinated water pipel...

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Abstract

The present invention discloses a denitration sulphur-fixing agent used for cement rotary kiln flue gas denitration and desulfurization, and a method and an apparatus for cement rotary kiln flue gas denitration and desulfurization using the agent. The denitration sulphur-fixing agent includes a reducing agent with a mass percent concentration of15-25% and a sulphur-fixing agent with a mass percent concentration of 30-55%. The apparatus includes a denitration sulphur-fixing agent preparation system, a denitration sulphur-fixing agent storage system, a denitration sulphur-fixing agent injection system and an automatic control system, wherein the denitration sulphur-fixing agent preparation system, the denitration sulphur-fixing agent storage system and the denitration sulphur-fixing agent injection system are successively connected; and the automatic control system is respectively connected with the denitration sulphur-fixing agent preparation system and the injection system. The unique denitration sulphur-fixing agent provided by the present invention is injected into the nozzle of the cement rotary kiln in two routes. Compared with the conventional technologies of SCR denitration and wet desulfurization, the original production process is unchanged, the method and the apparatus have the characteristics of simple manipulation and economy and high-efficiency.

Description

technical field [0001] The invention belongs to the technical field of cement kiln flue gas pollutant control, and in particular relates to a method and device for simultaneous denitrification and desulfurization of cement rotary kiln flue gas. Background technique [0002] Industries such as thermal power, cement, and steel are the main stationary sources of air pollutants. In the face of increasingly serious air pollution problems, my country has proposed the "Twelfth Five-Year Plan" period of nitrogen oxides (NO x ) reduced by 10%, sulfur dioxide (SO 2 ) to reduce the binding index by 8%. Guangdong Province has taken the lead in promulgating a more stringent "Emission Standard of Air Pollutants for the Cement Industry" (DB44 / 818-2010), which stipulates that nitrogen oxides, SO 2 The maximum emission concentration limit is 550mg / m 3 , 100mg / m 3 . Current cement kiln flue gas NO x The emission concentration is generally 800~1100mg / m 3 , due to high sulfur content in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/79B01D53/60
Inventor 岑超平陈志航唐志雄曾环木陈定盛方平陈雄波
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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