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System and method for treating sludge through cooperation between thermal hydrolysis and cement kiln

A technology of thermal hydrolysis and cement kiln, which is applied in the direction of pyrolysis treatment of sludge, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., and can solve the problems affecting the process stability and reduction of incineration Effect discount, general dehydration effect, etc., to avoid the risk of leakage and pollution of the environment, enhance market competitiveness, and improve dehydration performance

Pending Publication Date: 2022-02-22
北京汉能清源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. Without pretreatment, the sludge is directly dehydrated and reduced, and the dehydration effect is average; and some schemes add a large amount of chemicals for the dehydration effect, which greatly reduces the reduction effect; the final sludge is incinerated, of which More water content will affect the stability of the incineration process
[0009] 2. After the sludge is dehydrated, it continues to be dried to minimize the moisture content in the sludge. Although this method avoids the impact of moisture on the incineration process, the drying process requires an external heat source, which increases energy consumption.

Method used

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  • System and method for treating sludge through cooperation between thermal hydrolysis and cement kiln

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Embodiment 1

[0052] A method for thermal hydrolysis pretreatment in cooperation with cement kiln waste heat utilization for sludge disposal, the method comprising the following steps:

[0053] Step S1. Waste heat recovery, the cement kiln waste heat utilization device collects waste heat resources of the cement kiln, the cement kiln waste heat utilization device is a cement kiln, and the kiln tail flue gas of the cement kiln is used as the heat preservation heat source of the thermal hydrolysis treatment device, and is supplied to the thermal hydrolysis treatment use of the device;

[0054] Step S2. Thermal hydrolysis pretreatment. The sludge thermal hydrolysis pretreatment device performs thermal hydrolysis pretreatment on the sludge. The moisture content of the sludge is 85%. During the thermal hydrolysis pretreatment, the sludge enters the heat In the hydrolysis treatment device, the sludge is thermally hydrolyzed in the thermal hydrolysis treatment device 1 for 30 minutes to carry out ...

Embodiment 2

[0058] The difference from Example 1 is that the step of collecting sludge is also included.

[0059] A method for thermal hydrolysis pretreatment in conjunction with cement kiln waste heat utilization and disposal of sludge, specifically comprising the following steps:

[0060] Step S1. Collect the sludge, collect the sludge from the primary sedimentation tank and the secondary sedimentation tank of the sewage treatment plant. The sludge not only contains a large amount of organic matter and plant nutrients such as nitrogen and phosphorus, but also has a certain amount of pathogenic microorganisms, heavy metals and Poisonous and harmful substances that are difficult to degrade;

[0061] Step S2. Waste heat recovery, the cement kiln waste heat utilization device collects the waste heat resources of the cement kiln, the cement kiln waste heat utilization device is a cement kiln, and the kiln head flue gas of the cement kiln is used as the heat source of the sludge thermal hydro...

Embodiment 3

[0066] A method for thermal hydrolysis pretreatment in cooperation with cement kiln waste heat utilization for sludge disposal, the method comprising the following steps:

[0067] Step S1. Waste heat recovery, the cement kiln waste heat utilization device collects waste heat resources of the cement kiln, the cement kiln waste heat utilization device is a cement kiln waste heat boiler, and the steam of the waste heat boiler is used as the heat source of the thermal hydrolysis treatment device for use by the thermal hydrolysis treatment device ; Step S2. Thermal hydrolysis pretreatment, the sludge thermal hydrolysis pretreatment device performs thermal hydrolysis pretreatment on the collected sludge, the water content of the sludge is 85%, during the thermal hydrolysis pretreatment process, the sludge The sludge enters the sludge thermal hydrolysis pretreatment device, and the sludge is thermally hydrolyzed in the sludge thermal hydrolysis pretreatment device for 30 minutes to ca...

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Abstract

The invention discloses a system and a method for treating sludge through cooperation between thermal hydrolysis pretreatment and cement kiln waste heat utilization. According to the invention, sludge is pretreated by a thermal hydrolysis pretreatment device, a heat source is provided by a cement kiln, and then the sludge enters a mechanical dehydration device for dehydration. According to the system and the method, harmless, stable and reduction treatment of the sludge is realized, waste heat resources of the cement kiln are utilized, and project operation cost is reduced.

Description

technical field [0001] The invention relates to a sludge treatment system and method, in particular to a system and method for thermal hydrolysis pretreatment in cooperation with cement kiln waste heat utilization to treat sludge. Background technique [0002] With the acceleration of urbanization and the rapid development of social economy in our country, the sludge production is increasing year by year, and the pressure on the ecological environment is increasing. [0003] Sludge is a by-product of the sewage treatment process, mainly from the primary sedimentation tank and secondary sedimentation tank of the sewage treatment plant. Sludge not only contains a large amount of organic matter and plant nutrients such as nitrogen and phosphorus, but also a certain amount of pathogenic microorganisms, heavy metals and refractory toxic and harmful substances. Improper disposal of sludge can easily cause serious secondary pollution to the environment. The organic matters in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/10C02F11/18C02F11/02C02F11/13
CPCC02F11/00C02F11/10C02F11/004C02F11/18C02F11/02C02F11/13C02F2303/10
Inventor 陈东林程珩付艳辉佟道奎
Owner 北京汉能清源科技有限公司
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