阅读说明：本技术 一种用生活污泥改善煤炭燃烧的方法 (Method for improving coal combustion by using domestic sludge ) 是由 郑刘根 夏紫薇 周春财 林雨丰 于 2019-11-01 设计创作，主要内容包括：本发明公开了一种用生活污泥改善煤炭燃烧的方法,包括以下方法：(1)将生活污泥自然风干,然后研磨处理,得到泥粉；(2)将煤炭自然风干,然后研磨处理,得到煤粉；(3)将泥粉与煤粉混合,泥粉占泥粉与煤粉总量的5～15％,搅拌均匀,得到混合燃烧粉；(4)将混合燃烧粉投入真空管式炉中进行燃烧。本发明在煤粉中添加泥粉进行燃烧,可以增加燃烧特性,样品动力学方程拟合结果表明,混合燃烧粉的第一阶段与第二阶段主要以污泥燃烧为主,而第三阶段主要以煤燃烧为主,混合燃烧粉的活化能均位于两种原料之间,并且随着泥粉的添加量而降低,表明添加泥粉能有效提高煤的反应活性并促进其燃烧过程,通本发明可以彻底燃烧污泥,使挥发分充分析出。(The invention discloses a method for improving coal combustion by using domestic sludge, which comprises the following steps: (1) naturally drying the domestic sludge, and then grinding to obtain sludge powder; (2) naturally drying coal, and then grinding to obtain coal powder; (3) mixing mud powder and coal powder, wherein the mud powder accounts for 5-15% of the total amount of the mud powder and the coal powder, and uniformly stirring to obtain mixed combustion powder; (4) and putting the mixed combustion powder into a vacuum tube furnace for combustion. The invention adds the mud powder into the coal powder for combustion, which can increase the combustion characteristic, and the sample kinetic equation fitting result shows that the first stage and the second stage of the mixed combustion powder mainly use the sludge combustion, while the third stage mainly uses the coal combustion, the activation energy of the mixed combustion powder is positioned between the two raw materials, and is reduced along with the addition amount of the mud powder, which shows that the addition of the mud powder can effectively improve the reaction activity of the coal and promote the combustion process thereof, and the invention can thoroughly combust the sludge and fully separate out the volatile component.)

1. A method for improving coal combustion by using domestic sludge is characterized in that: the method comprises the following steps:

(1) naturally drying the domestic sludge, and then grinding to obtain sludge powder;

(2) naturally drying coal, and then grinding to obtain coal powder;

(3) mixing mud powder and coal powder, wherein the mud powder accounts for 10-50% of the total amount of the mud powder and the coal powder, and uniformly stirring to obtain mixed combustion powder;

(4) and putting the mixed combustion powder into a vacuum tube furnace for combustion.

2. The method of improving coal combustion with domestic sludge as claimed in claim 1, wherein: the water content of the mud powder is less than or equal to 8 percent.

3. A method for improving coal combustion with domestic sludge as claimed in claim 1 or 2, characterized in that: the volatile content of the mud powder is more than or equal to 40 percent.

4. A method for improving coal combustion with domestic sludge as claimed in claim 1 or 2, characterized in that: the fixed carbon content of the pulverized coal is more than or equal to 38 percent.

5. A method for improving coal combustion with domestic sludge as claimed in claim 1 or 2, characterized in that: the grain diameter of the mud powder and the coal powder is less than or equal to 0.15 mm.

6. A method for improving coal combustion with domestic sludge as claimed in claim 1 or 2, characterized in that: the specific process of combustion is as follows: the temperature is raised to 900 ℃ at a temperature rise rate of 20 ℃/min.

Technical Field

The invention relates to the field of domestic sludge treatment, in particular to a method for improving coal combustion by using domestic sludge.

Background

The rapid development of Chinese economy leads to the continuous increase of sewage discharge, and sludge is a byproduct in the sewage treatment process. According to the annual book of Chinese urban construction statistics, the dry sludge production of a Chinese sewage treatment plant is about 800 million tons in 2016. These sludges emit foul smells that pollute the air and contain many harmful substances such as heavy metals, pathogenic microorganisms, parasitic eggs and poorly degradable organic compounds. Traditional methods of sludge treatment, such as landfill and agricultural use, may pose potential environmental risks to air, soil and water.

Sludge incineration is a waste energy technology, which can reduce the environmental pollution and relieve the increasingly severe energy crisis. Meanwhile, the technology can not only greatly reduce the odor and the sludge amount, but also can thermally destroy toxic organic components in the sludge. However, the sludge has high moisture, high ash content, high density, high viscosity and low calorific value, and has the disadvantages of incomplete combustion alone, difficulty in separation of volatile components, and the like.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for improving coal combustion by using domestic sludge with good combustion characteristics.

In order to solve the technical problems, the invention adopts the following technical scheme: a method for improving coal combustion with domestic sludge, comprising the steps of:

(1) naturally drying the domestic sludge, and then grinding to obtain sludge powder;

(2) naturally drying coal, and then grinding to obtain coal powder;

(3) mixing mud powder and coal powder, wherein the mud powder accounts for 10-50% of the total amount of the mud powder and the coal powder, and uniformly stirring to obtain mixed combustion powder;

(4) and putting the mixed combustion powder into a vacuum tube furnace for combustion.

Further, the water content of the mud powder is less than or equal to 8 percent.

Further, the volatile content of the mud powder is more than or equal to 40 percent.

Further, the fixed carbon content of the pulverized coal is more than or equal to 38%.

Furthermore, the particle size of the mud powder and the coal powder is less than or equal to 0.15 mm.

Further, the specific process of combustion is as follows: the temperature is raised to 900 ℃ at a temperature rise rate of 20 ℃/min.

The invention has the beneficial effects that:

the invention adds mud powder into coal powder for combustion, which can increase combustion characteristics, and the sample kinetic equation fitting result shows that the first stage and the second stage of mixed combustion powder mainly use mud powder combustion, while the third stage mainly uses coal powder combustion, the activation energy of the mixed combustion powder is between two raw materials, and is reduced along with the addition of mud powder, which shows that the addition of mud powder can effectively improve the reaction activity of coal powder and promote the combustion process.

Drawings

FIG. 1 is TG and DTG spectra of pulverized coal and pulverized sludge combustion alone.

FIG. 2 is a burning TG spectrum of pulverized coal and pulverized sludge at different mixing ratios.

FIG. 3 is a DTG map of the combustion of coal fines and silt fines at different mixing ratios.

FIG. 4 is a TG spectrum of pulverized coal and pulverized sludge combustion at different temperature-rise rates.

FIG. 5 is a DTG plot of pulverized coal and pulverized sludge combustion at different ramp rates.

Detailed Description

The invention is further described below with reference to the following examples:

the various starting materials used in the following examples are all commercially available products known in the art unless otherwise specified. Among them, industrial analysis, elemental analysis and ash component analysis of the sludge powder and the pulverized coal are shown in tables 1 and 2 below.

TABLE 1 Industrial and elemental analysis of the materials

TABLE 2 analysis of ash content of raw materials