System and method for replacing fuel with biomass in cement kiln

A biomass fuel and alternative fuel technology, applied in waste fuel, cement production, combustion methods, etc., can solve problems such as the inability to achieve large-scale application in large quantities, reduce energy consumption for crushing, increase calorific value significantly, and save energy. consumption effect

Pending Publication Date: 2022-07-05
成都建筑材料工业设计研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems that the biomass substitute fuel affects the production and operation of the cement kiln system at the present stage, and cannot realize large-scale mixing and large-scale application, the present invention provides a system and method for cement kilns to use biomass as a substitute fuel. With large dosage and large-scale utilization, it does not affect the normal operation of the cement kiln system, and is suitable for large-scale promotion and use in industry

Method used

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  • System and method for replacing fuel with biomass in cement kiln

Examples

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Comparison scheme
Effect test

Embodiment 1

[0038] refer to figure 1 As shown in the figure, a system for replacing fuel with biomass in a cement kiln includes a combined fuel storage workshop 1, a second conveying quantitative component, a primary drying device 8, a dust collector 9, a secondary drying and homogenizing bin 10, a first Three conveying quantitative components, the fourth conveying component and the pre-burning furnace 15. The rotary kiln 18 and the calcining furnace 19 are the original cement kiln system, and the calcining furnace 19 is connected to the end of the rotary kiln 18.

[0039] The fuel combined storage workshop 1 is provided with an intelligent grab crane 2 , a first feeding bin 3 , a crusher 4 , a spray dust removal device 17 , a large particle size biomass fuel pit 22 and a small particle size biomass fuel pit 23 . The second conveying quantitative assembly includes a second feeding bin 5, a second screw conveyor 6 and a second quantitative feeder 7. The third conveying and quantitative a...

Embodiment 2

[0050] A kind of method that a cement kiln utilizes biomass to replace fuel, adopts the system that above-mentioned cement kiln utilizes biomass to replace fuel, comprises the steps:

[0051] Step 1, the biomass fuel is sent into the fuel joint storage workshop 1, and is classified according to the particle size of the entrance is greater than or less than 100mm, and enters the large particle size biomass fuel pit 22 or the small particle size biomass fuel pit 23 respectively. The types of biomass fuels include one or more types, the particle size of which is less than 500mm, and the moisture content is less than or equal to 80%.

[0052] In step 2, the large particle size biomass fuel is sent into the first feeding bin 3 through the coarse material grab in the intelligent grab crane 2, and is crushed to a particle size smaller than 100 mm by the crusher 4 below, and then enters the small particle size biomass. The fuel pit 23 is stored.

[0053] Step 3., the small particle s...

Embodiment 3

[0063] A method for replacing fuel with biomass in a cement kiln, comprising the following steps:

[0064] In step ①, straw with a particle size of 120 mm and a moisture content of 50% is sent into the large particle size biomass fuel pit 22 of the combined fuel storage workshop 1. In step (2), the straw is crushed to a particle size of 50 mm by the crusher 4 and enters the small particle size biomass fuel pit 23. In step ③, the waste heat flue gas from the kiln head is used as a heat source, and the inlet air temperature of the flue gas is set to 120°C, and the moisture content of the straw after drying is reduced from 50% to 25%. In step ④, the mixed waste heat flue gas from the kiln head and the kiln tail of the cement kiln is used as the heat source, and the inlet air temperature of the flue gas is set to 100 °C, and the moisture content of the straw is reduced from 25% to 18% after the secondary drying. In step ⑤, the heat replacement rate of the decomposition furnace is...

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Abstract

The invention discloses a system and method for replacing fuel with biomass in a cement kiln. The system comprises a fuel combined storage workshop, a first-stage drying device, a second-stage drying and homogenizing bin and a decomposing furnace. The method comprises the following steps: small-particle-size biomass fuel enters a first-stage drying device, and flue gas at 80-130 DEG C is used as a heat source to heat and dry the biomass fuel; the biomass fuel enters the second-stage drying and homogenizing bin, flue gas with the temperature of 80-130 DEG C serves as a heat source to heat and dry the biomass fuel, and the flue gas is blown upwards vertically through the bottom to conduct countercurrent flow heat exchange with the downward biomass fuel. The biomass alternative fuel is subjected to two-stage drying through waste heat, heat energy is fully recycled, the water removal rate of the fuel can reach 15%-80%, and the heat value is obviously increased; and a material homogenizing process is arranged, so that the homogenized material composition fluctuation is smaller, and the stability of a thermal system of the cement kiln is facilitated.

Description

technical field [0001] The invention belongs to the field of energy saving, carbon reduction and environmental protection, and particularly relates to a system and method for replacing fuel with biomass in a cement kiln. Background technique [0002] At this stage, biomass alternative fuels in my country generally have the characteristics of high moisture, low calorific value, and large fluctuation of components. During combustion, there are problems such as non-concentration of flame, poor stability, and high content of alkaline substances, which lead to the crusting of the calciner, which affects the performance of the cement kiln system. Normal operation, can not achieve large dosage, large-scale application. SUMMARY OF THE INVENTION [0003] Aiming at the problems that the biomass substitute fuel affects the production and operation of the cement kiln system at the current stage, and the large dosage and large-scale application cannot be realized, the present inventio...

Claims

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Application Information

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IPC IPC(8): F23K1/00F23K1/04F27D17/00F26B21/00F26B25/22
CPCF23K1/00F23K1/04F27D17/00F26B21/001F26B25/22Y02P40/125
Inventor 马旭高敏董贝刘建蔡顺华李文祎
Owner 成都建筑材料工业设计研究院有限公司
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