A method for improving the grindability of cement raw meal and reducing toc emission by using kitchen waste

A technology for cement raw meal and kitchen waste, applied in cement production, clinker production and other directions, can solve the problem of not suppressing TOC emission, etc., and achieve the effects of promoting crack propagation, suppressing emission, and improving grindability

Active Publication Date: 2015-07-29
SINOMA INT ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no practical method to suppress TOC emission at home and abroad

Method used

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  • A method for improving the grindability of cement raw meal and reducing toc emission by using kitchen waste
  • A method for improving the grindability of cement raw meal and reducing toc emission by using kitchen waste
  • A method for improving the grindability of cement raw meal and reducing toc emission by using kitchen waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Small-scale test: small-scale vertical mill experimental platform, the feed rate of raw meal is 150kg / h, and the amount of kitchen waste added is 15kg / h. After fully mixing the kitchen residues separated from municipal solid waste with limestone, clay, iron ore and other raw materials required for raw meal preparation, they are sent to a small vertical mill experimental platform for grinding, and are mixed with no kitchen waste under the same conditions. The comparison of the grinding experiment of the residue. The results showed that after adding kitchen waste, the power consumption of the small vertical mill experimental platform was reduced by 1.2 degrees / ton of raw meal.

specific Embodiment approach

[0026] For a 5000t / d cement clinker production line, the raw material feed rate of the supporting vertical mill is 420t / h. The specific implementation is as follows:

[0027] 1) According to the requirements of raw material preparation in the cement production process, determine the chemical composition of the kitchen waste sorted from municipal solid waste; the chemical composition (dry basis, %) of the kitchen waste in a certain domestic city is shown in Table 1 below:

[0028] Table 1

[0029] loss

SiO 2

Al 2 o 3

Fe 2 o 3

CaO

MgO

K 2 o

Na 2 o

SO 3

Cl -

52.10

27.09

4.74

3.10

6.50

0.88

1.20

1.20

0.31

1.05

[0030] The results show that the ash formed after the incineration of kitchen waste is mainly composed of SiO 2 , can be used to replace clay raw materials.

[0031] 2) After the food waste enters the cement plant, it is stacked in the food waste storage pit 1,...

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Abstract

The invention discloses a method used for improving cement raw material grindability and reducing TOC discharge with kitchen waste. According to the method, the kitchen waste collected from municipal solid waste is mixed with raw materials which are used for preparing cement raw material; and an obtained mixture is delivered into a flour mill for grinding, wherein the outlet of the flour mill is provided with a gamma-Metric analyzer used for real-time monitoring on chemical components of the discharged cement raw material. According to the method, kitchen waste is added into a raw material grinding system so as to improve grindability of the cement raw material, and reduce power consumption of the flour mill; ash obtained via combustion of the kitchen waste can be used for replacing clay raw material; TOC discharge of a cement production system is reduced at the same time; a large amount of organic substances with relatively heat value are obtained via drying of the kitchen waste, and are burnt in a preheater so as to generate heat energy, so that the temperature of waste gas is increased, and waste heat power generation is increased; the kitchen waste is subjected to low-temperature drying grinding, a large amount of residual heat energy obtained via cerement plant waste heat power generation is recycled, a kitchen waste dewatering problem is solved, and processing cost of the kitchen waste is reduced.

Description

technical field [0001] The invention belongs to the technical field of cement raw meal grinding, and in particular relates to improving the grindability of raw meal by utilizing municipal domestic waste, reducing TOC generation in a cement production system, and reducing energy consumption and TOC discharge. Background technique [0002] The main raw materials for making Portland cement clinker include calcareous raw materials, clay raw materials, iron correction raw materials, etc. Due to the different mineral deposition ages and structures of various raw materials, the raw meal prepared from different raw materials has different levels of grindability. The vertical mill is used to grind different raw materials. The usual method is to adjust the operating parameters of the vertical mill to ensure that the fineness of the raw material meets the control requirements of cement production, such as adjusting the roller pressure and material layer thickness of the vertical mill. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/38
CPCY02P40/10Y02P40/121
Inventor 蔡玉良杨学权肖国先李波董家明吴德厚
Owner SINOMA INT ENG
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