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Chain grate-rotary kiln-circular cooler pellet flue gas circulation coupling treatment system and flue gas treatment process thereof

A flue gas circulation and treatment system technology, applied in the field of flue gas treatment engineering, can solve problems such as less research on additives, and achieve the effects of improving heat utilization efficiency, optimizing denitration process parameters, and reducing energy consumption

Active Publication Date: 2022-02-18
ZHONGYE-CHANGTIAN INT ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are few researches on the additives of SNCR technology applied to chain grate machine-rotary kiln oxidation pellet flue gas denitrification (flue gas temperature range is 850-1100°C)

Method used

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  • Chain grate-rotary kiln-circular cooler pellet flue gas circulation coupling treatment system and flue gas treatment process thereof
  • Chain grate-rotary kiln-circular cooler pellet flue gas circulation coupling treatment system and flue gas treatment process thereof
  • Chain grate-rotary kiln-circular cooler pellet flue gas circulation coupling treatment system and flue gas treatment process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0218] According to the second embodiment of the present invention, there is provided a flue gas treatment process or a flue gas treatment process using the chain grate machine-rotary kiln-circular cooler pellet flue gas circulation coupling treatment system described in the first embodiment process, the process includes the following steps:

[0219] 1) According to the direction of the material, the raw balls enter the chain grate machine 1, and then pass through the blast drying section UDD, the draft drying section DDD, the transitional preheating section TPH and the preheating section PH on the chain grate machine 1, and then are transported to the rotary kiln 2 Internal oxidation roasting. The calcined pellets are transported to the ring cooler 3 and then discharged after being cooled.

[0220] 2) According to the flow direction of the hot air, the hot air discharged from the annular cooling section C1 in the annular cooler 3 is transported to the rotary kiln 2 through t...

Embodiment 1

[0287] Such as figure 1 As shown, a chain grate machine-rotary kiln-circular cooler pellet flue gas circulation coupling processing system includes a chain grate machine 1, a rotary kiln 2, a ring cooler 3, and an SCR denitrification device 5. According to the direction of the material, the chain grate machine 1 is sequentially provided with a blast drying section UDD, a draft drying section DDD, a transitional preheating section TPH and a preheating section PH. The annular cooler 3 is sequentially provided with a first stage of annular cooling C1, a second stage of annular cooling C2 and a third stage of annular cooling C3.

[0288]According to the trend of hot air, the air outlet of the rotary kiln 2 is connected to the air inlet of the preheating section PH through the first pipeline L1. The air outlet of the preheating section PH is connected to the air inlet of the draft drying section DDD through the second pipeline L2. The air outlets of the transitional preheating s...

Embodiment 2

[0290] Repeat Example 1, such as Figure 7 and 8 As shown, J air boxes 7 are arranged at the bottom of the transition preheating section TPH, and the air outlet of each of the J air boxes is connected to the third pipeline L3 and the fourth pipeline L4 through the switching valve 701 at the same time. By switching the valve 701 , the air outlet of any air box 7 is controlled to only communicate with the third pipeline L3 or only communicate with the fourth pipeline L4 .

[0291] According to the direction of the material, the numbers of the J bellows 7 in the transition preheating section TPH are 1, 2, 3, . . . , J in sequence. Wherein, the first to jth air boxes 7 are used as front air boxes and are all connected with the fourth pipeline L4. The (j+1)th to Jth air boxes 7 are used as rear air boxes and all communicate with the third pipeline L3. 1≤j≤J. J is 1-50.

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Abstract

The invention discloses a chain grate-rotary kiln-circular cooler pellet flue gas circulation coupling treatment system, which is characterized in that specific flue gas at a transition preheating section of a chain grate is circulated, and meanwhile, waste gas discharged from the preheating section is subjected to non-heating SCR (Selective Catalytic Reduction) denitration treatment. A control method of the SNCR-SCR coupling denitration mathematical model is also established, and pellet flue gas is treated by adding a composite additive into an SNCR denitration catalyst or providing a novel SNCR composite ammonia agent. According to the invention, the hot air circulation mechanism of the system is optimized, the optimal coupling ultralow NOx emission technology is established, the denitration efficiency can be effectively ensured on the premise of reducing the SNCR ammonia consumption, the service life of the SCR denitration catalyst can be prolonged, and the denitration operation cost and investment cost of the system are obviously reduced. And under the condition of ensuring the product quality index, the waste gas treatment amount is reduced, the fuel consumption is reduced, and ultralow emission of flue gas pollutants is realized.

Description

technical field [0001] The invention relates to a flue gas treatment project, in particular to a chain grate machine-rotary kiln-circular cooler pellet flue gas cycle coupling treatment system and its flue gas treatment process, belonging to the chain grate machine-rotary kiln flue gas treatment technology and energy saving emission reduction area. Background technique [0002] As an important furnace material for blast furnace ironmaking, pellets have many advantages such as high strength and good metallurgical properties. Compared with the sintering process, the pelletizing process has lower energy consumption and pollution load, and the pellets are more suitable for my country's refined Therefore, pelletizing is an iron ore agglomeration technology that encourages the development. With the development of the steel industry, the output of pellets in my country is also increasing year by year. [0003] The pelletizing process includes three processes: shaft furnace, chain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00F27D13/00F27D15/02
CPCF27D17/008F27D17/004F27D13/00F27D15/0206Y02P10/25
Inventor 胡兵甘敏范晓慧叶恒棣
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD