CN112484053A

CN112484053A - Cooperative treatment process for urban dried sludge by using cement kiln

Info

Publication number: CN112484053A
Application number: CN202010489594.2A
Authority: CN
Inventors: 泥卫东; 张思思; 张春辉; 钟红春; 李瑞强; 马超伟; 吴万辉
Original assignee: Sino Environment Protection Engineering Technology Co ltd
Current assignee: Sino Environment Protection Engineering Technology Co ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-03-12

Abstract

The invention discloses a municipal dried sludge kiln cooperative treatment process, and relates to the technical field of dried sludge treatment. Mud passes through mud discharging bin and mud driving feed bin, reach tubulose rubber belt conveyor behind the board feeding machine, then transport to the transfer station, the transfer station is equipped with mud buffer storage storehouse, after board feeding machine, transport the lifting machine by tubulose rubber belt conveyor, transport the kiln tail by the lifting machine, after broken to the little storehouse of mud, burn through zip fastener machine feeding dore furnace and precombustion chamber after the ration batcher measurement and handle, most poisonous organic matter reaches thorough decomposition, the sinter slag of a small amount of great granule then falls down in the flue that rises by the kiln tail and gets into the rotary kiln, calcine into cement clinker through the rotary kiln system again, thoroughly realize the innoxious processing of mud.

Description

Cooperative treatment process for urban dried sludge by using cement kiln

Technical Field

The invention relates to the technical field of dried sludge treatment, in particular to a municipal dried sludge kiln cooperative treatment process.

Background

At present, most municipal sewage plants have the water content of 80 percent of the sludge leaving the factory, and the sludge enters a cement plant and is sprayed into a decomposing furnace for incineration disposal after being stored for a short time.

In order to realize reduction, stabilization, harmlessness and recycling of sludge, ensure stable operation of sewage, sludge treatment equipment and facilities, prevent secondary pollution in the sludge treatment process, maintain good ecological environment and promote coordinated development of social economy and environmental protection, many cities require sludge treatment plants to dry sludge until the water content is 30-40%, and then leave the factory, so that convenience is provided for subsequent cement kiln incineration and power plant blending combustion. However, the sludge with the water content cannot be sprayed into the decomposing furnace, and no reference case exists at home and abroad, so that a more complete cement kiln cooperative treatment process is necessary to be designed for the sludge with the water content.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a co-treatment process of an urban dried sludge and cement kiln, which does not cause secondary pollution to the environment on the premise of ensuring the harmless treatment of sludge.

In order to achieve the purpose, the invention is realized by the following technical scheme: a municipal drying sludge cement kiln cooperative treatment process comprises the following steps:

1. the sludge is transported to a sludge disposal workshop unloading platform by a closed sludge tank truck, the sludge tank truck backs into a position, and when the kiln normally operates, the sludge is directly unloaded to a sludge unloading bin; when the kiln is stopped for maintenance, the sludge is discharged to a sludge discharge pit and is transported to a sludge storage by a travelling crane grab bucket, and after the kiln resumes operation, the sludge is transported to a sludge travelling crane bin by the travelling crane grab bucket for treatment;

2. the sludge passes through a sludge discharging bin and a sludge travelling bin, passes through a plate feeder, then reaches a tubular rubber belt conveyor, then is conveyed to a transfer station, the transfer station is provided with a sludge buffer bin, then passes through the plate feeder, is conveyed to a lifter by the tubular rubber belt conveyor, is conveyed to a kiln tail by the lifter, is crushed to a small sludge bin, is metered by a quantitative feeder, and then is fed into a decomposing furnace and a precombustion chamber by a zipper machine for incineration disposal, most toxic organic matters are thoroughly decomposed, a small amount of large-particle sintering slag falls from a kiln tail ascending flue to enter a rotary kiln, and is calcined into cement clinker by a rotary kiln system, so that the harmless disposal of the sludge is thoroughly realized;

3. collecting odor generated in the processes of unloading, storing, crushing and conveying in the steps, then performing dust removal treatment, and then taking the odor as cooling air of the grate cooler to enter the kiln for incineration disposal; when the kiln is stopped, the odor goes to a standby deodorization system for deodorization treatment.

Preferably, the sludge storage of the sludge storage in the step 1 has the sludge height of not more than 5 meters.

Preferably, the water content of the sludge in the step 1 is 30-50%, the granularity is 80% <0.1mm-20mm, the ash content is 50-60%, and the heat value is 1000-.

Preferably, the particle size of the sludge crushed in the step 2 is more than 85% and less than 5 mm.

The invention has the beneficial effects that: because a large amount of microorganisms still survive in the dry sludge, the sludge is hardened due to fermentation in the process of stockpiling. Therefore, the invention pretreats the dry sludge, and after the sludge is crushed, the particle uniformity is better and the combustion is more sufficient. The process of the invention does not cause secondary pollution to the environment on the premise of ensuring the harmless treatment of the sludge.

Drawings

The invention is described in detail below with reference to the drawings and the detailed description;

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

Referring to fig. 1, the following technical solutions are adopted in the present embodiment: a municipal drying sludge cement kiln cooperative treatment process comprises the following steps:

The water content of the sludge in the specific embodiment is 30-50%, the granularity is 80% <0.1mm-20mm, the ash content is 50-60%, and the heat value is 1000-; the pile height is 5m at most when the sludge is stored, because the pile height is definitely 5 m-6 m according to a pile height experiment with large volume, the temperature rise inside the material pile is in a safe storage temperature range, and the material pile can not self-ignite. The crushed sludge with the grain diameter more than 85 percent less than 5mm can be fully combusted and decomposed in the decomposing furnace and the pre-combustion chamber.

The concrete embodiment adopts the technology of cooperatively treating dry sludge by using a cement kiln. After the dry sludge is subjected to crushing pretreatment, uniform sludge particles are conveyed into a decomposing furnace and a precombustion chamber to be combusted. The influence of the dry sludge on the stability of the kiln system is greatly reduced, the dry sludge treatment amount can also be greatly increased, and the maximum treatment amount can reach 600 t/d. Because a large amount of microorganisms still survive in the dry sludge, the sludge is hardened due to fermentation in the process of stockpiling. Therefore, the embodiment pretreats the dry sludge, and after the sludge is crushed, the particles have better uniformity and are more sufficiently combusted; moreover, the odor generated in the whole process is collected and dedusted, so that the process is more environment-friendly.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The cooperative treatment process of the urban dried sludge cement kiln is characterized by comprising the following steps:

(1) the sludge is transported to a sludge disposal workshop discharging platform by a closed sludge tank truck, the sludge tank truck backs into a position, and when the kiln normally operates, the sludge is directly discharged to a sludge discharging bin; when the kiln is stopped for maintenance, the sludge is discharged to a sludge discharge pit and is transported to a sludge storage by a travelling crane grab bucket, and after the kiln resumes operation, the sludge is transported to a sludge travelling crane bin by the travelling crane grab bucket for treatment;

(2) the sludge passes through a sludge discharging bin and a sludge travelling bin, passes through a plate feeder, then reaches a tubular rubber belt conveyor, then is conveyed to a transfer station, the transfer station is provided with a sludge buffer bin, then passes through the plate feeder, is conveyed to a lifter by the tubular rubber belt conveyor, is conveyed to a kiln tail by the lifter, is crushed to a small sludge bin, is metered by a quantitative feeder, and then is fed into a decomposing furnace and a precombustion chamber by a zipper machine for incineration disposal, most toxic organic matters are thoroughly decomposed, a small amount of large-particle sintering slag falls from a kiln tail ascending flue into a rotary kiln, and is calcined into cement clinker by a rotary kiln system, so that the harmless disposal of the sludge is thoroughly realized;

(3) collecting odor in the processes of unloading, storing, crushing and conveying in the steps, then performing dust removal treatment, and then taking the odor as cooling air of the grate cooler to enter the kiln for incineration disposal; when the kiln is stopped, the odor goes to a standby deodorization system for deodorization treatment.

2. The municipal dried sludge kiln co-processing technology according to claim 1, wherein the sludge in the sludge storage in the step (1) is stored at a height of not more than 5 m.

3. The municipal dried sludge kiln co-processing technology as claimed in claim 1, wherein the sludge in the step (1) has a water content of 30-50%, a particle size of 80% <0.1mm-20mm, an ash content of 50-60%, and a calorific value of 1000-1200 kcal/kg.

4. The municipal dried sludge kiln co-processing process according to claim 1, wherein 85% or more of the crushed sludge in the step (2) has a particle size smaller than 5 mm.