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CN-121993801-A - System for disposing alternative fuel based on cement kiln

CN121993801ACN 121993801 ACN121993801 ACN 121993801ACN-121993801-A

Abstract

The present disclosure provides a system for disposing of alternative fuel based on a cement kiln, comprising a preheating mechanism adapted to preheat raw meal to obtain hot raw meal, a conversion mechanism adapted to receive the alternative fuel and to heat the alternative fuel to a preset temperature at which combustible gas and solid products are produced, and a decomposition mechanism in communication with the preheating mechanism and the conversion mechanism, respectively, adapted to receive combustion of the combustible gas to calcine the hot raw meal and the solid products to form decomposition products.

Inventors

  • WANG JUNJIE
  • ZHU ZHIPING
  • CAI JUN
  • ZHAN YUEPING
  • YANG HUAWEI
  • LI BAIHANG

Assignees

  • 中国科学院工程热物理研究所

Dates

Publication Date
20260508
Application Date
20241106

Claims (10)

  1. 1. A system for disposing of alternative fuel based on a cement kiln, comprising: A preheating mechanism (1) adapted to preheat the raw meal to obtain a hot raw meal; A conversion mechanism (2) adapted to contain a substitute fuel and to heat said substitute fuel to a preset temperature for producing combustible gases and solid products; And the decomposing mechanism (3) is respectively communicated with the preheating mechanism (1) and the converting mechanism (2) and is suitable for containing combustible gas for combustion so as to calcine the hot raw meal and the solid product to form decomposed products.
  2. 2. The system according to claim 1, characterized in that the preheating means (1) is also in communication with the converting means (2) and is adapted to heat the alternative fuel to the preset temperature by means of the heat of the hot raw meal.
  3. 3. The system according to claim 2, further comprising a distribution valve adapted to distribute at least a part of the hot raw meal to the conversion mechanism (2) for adjusting the temperature in the conversion mechanism (2).
  4. 4. The system according to claim 2, characterized in that the converting means (2) comprises a rotary kiln for feeding the alternative fuel and the hot raw meal into the decomposing means (3) simultaneously when the alternative fuel generates combustible gas.
  5. 5. The system of claim 1, further comprising an air intake mechanism (4) in communication with the reformer mechanism (2) and adapted to adjustably blow air into the reformer mechanism (2) to cause pyrolysis and/or gasification of the alternative fuel to produce the combustible gas.
  6. 6. The system according to any one of claims 1-5, characterized in that a first pipeline and a second pipeline are arranged between the conversion means (2) and the decomposition means (3), the first pipeline being adapted to convey the combustible gas to the decomposition means (3), the second pipeline being adapted to convey the hot raw meal and the solid products to the decomposition means (3).
  7. 7. The system according to any one of claims 1 to 5, wherein the preheating means (1) comprises two preheating units, at least one of which is in communication with the converting means (2).
  8. 8. The system according to claim 7, further comprising a calcination mechanism (6) adapted to calcine the decomposition product into clinker.
  9. 9. The system of claim 8, wherein each of said preheating units comprises, A preheating unit (11) which is provided upstream of the decomposing mechanism (3) in accordance with the direction of conveyance of the raw meal and which is adapted to stepwise preheat the raw meal; and a separation unit (12) provided between the decomposition mechanism (3) and the calcination mechanism (6) and adapted to convey the decomposition products generated in the decomposition mechanism (3) to the calcination mechanism (6), and adapted to return the flue gas generated in the decomposition mechanism (3) and/or the calcination mechanism (6) to the preheating unit (11).
  10. 10. The system of claim 8, further comprising a burner disposed within the calcination mechanism (6) and in communication with the conversion mechanism (2) to combust the combustible gas.

Description

System for disposing alternative fuel based on cement kiln Technical Field The present disclosure relates to the field of cement production, and in particular to a system for disposing alternative fuels based on a cement kiln. Background The cement industry is one of industries with large carbon emission and faces huge carbon reduction pressure. The traditional cement kiln fuel such as fossil fuel like coal has high carbon emission and also brings serious environmental pollution. Therefore, development and application of alternative fuel technology become important actions for energy conservation and carbon reduction in the cement industry. With the continuous development of technology, cement kiln alternative fuel combustion systems have enabled efficient combustion of a variety of alternative fuels. The waste textile, biomass, waste plastics, household garbage oversize and other alternative fuels can be sent into a cement kiln for combustion so as to replace the traditional fossil fuels. The system not only solves the problem of solid waste disposal, but also reduces the consumption of fossil fuel in the cement kiln production line. However, the existing approaches of using alternative fuels in cement kilns mainly have the problems of low heat utilization efficiency or increased NOx emission level by adding the alternative fuels to a decomposing furnace after pretreatment or directly adding the alternative fuels to an externally hung furnace. Disclosure of Invention In view of this, the present disclosure provides a system for disposing of alternative fuels based on a cement kiln. The system for disposing the alternative fuel based on the cement kiln comprises a preheating mechanism, a conversion mechanism and a decomposition mechanism, wherein the preheating mechanism is suitable for preheating raw materials to obtain hot raw materials, the conversion mechanism is suitable for containing the alternative fuel and heating the alternative fuel to a preset temperature for generating combustible gas and solid products, and the decomposition mechanism is respectively communicated with the preheating mechanism and the conversion mechanism and is suitable for containing the combustible gas for burning to calcine the hot raw materials and the solid products to form the decomposition products. According to an embodiment of the present disclosure, the preheating means is also in communication with the converting means, adapted to heat the alternative fuel to a preset temperature by means of the heat of the hot raw meal. According to an embodiment of the present disclosure, a distribution valve is further comprised, adapted to distribute at least a portion of the hot raw meal to the conversion mechanism for adjusting the temperature within the conversion mechanism. According to an embodiment of the present disclosure, the conversion mechanism includes a rotary kiln to simultaneously feed the alternative fuel and the hot raw meal into the decomposition mechanism as the alternative fuel produces the combustible gas. According to an embodiment of the present disclosure, the system further comprises an air intake mechanism in communication with the reformer mechanism and adapted to adjustably blow air into the reformer mechanism to cause pyrolysis and/or gasification of the alternative fuel to produce a combustible gas. According to an embodiment of the present disclosure, a first pipeline and a second pipeline are arranged between the conversion means and the decomposition means, the first pipeline being adapted to convey combustible gas to the decomposition means, the second pipeline being adapted to convey hot raw meal and solid products to the decomposition means. According to an embodiment of the present disclosure, the preheating mechanism comprises two preheating units, at least one preheating unit being in communication with the conversion mechanism. According to an embodiment of the present disclosure, there is further included a calcination mechanism adapted to calcine the decomposition product into clinker. According to the embodiment of the disclosure, each preheating unit comprises a preheating part which is arranged at the upstream of the decomposition mechanism according to the conveying direction of the raw meal and is suitable for carrying out step preheating on the raw meal, and a separation part which is arranged between the decomposition mechanism and the calcination mechanism and is suitable for conveying decomposition products generated in the decomposition mechanism (3) to the calcination mechanism and also suitable for refluxing smoke generated by the decomposition mechanism and/or the calcination mechanism to the preheating part. According to an embodiment of the disclosure, the device further comprises a combustor, wherein the combustor is arranged in the calcining mechanism and communicated with the converting mechanism to combust the combustible gas. According to the system for disposing the