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Sludge pyrolytic digestion process for efficiently recovering heat energy and equipment thereof

A technology for recovering heat energy and sludge, which is applied in the direction of pyrolysis sludge treatment, sludge treatment, biological sludge treatment, etc., which can solve the problems of heat loss and heat energy consumption, reduce sludge volume, ensure stability and high efficiency performance, and the effect of improving anaerobic digestion performance

Inactive Publication Date: 2012-04-25
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heating process of "thermal hydrolysis-anaerobic digestion" to treat the remaining activated sludge consumes a lot of heat energy, and there is a lot of waste heat in the hydrolyzed sludge, resulting in heat loss. Effective control of system energy consumption is an important topic of current research

Method used

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  • Sludge pyrolytic digestion process for efficiently recovering heat energy and equipment thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The remaining sludge after aerobic treatment (with a moisture content above 99%) is first pre-dehydrated by a centrifugal separator or a belt dryer to a moisture content of 80%, and the pre-dehydrated sludge enters the sludge storage tank to be separated from the rest The reflux sludge is mixed, and the mixed sludge enters the hydrolysis reactor A after passing through the crusher, and is heated and pressurized to 150°C and 0.5Mpa by injecting hot steam (in the sludge heating stage of the hydrolysis reactor A, the hydrolysis reactor B starts to material), thermally hydrolyzed for 60min.

[0032] After the hydrolysis reaction in the hydrolysis reactor A is completed, the hot steam enters the hydrolysis reactor B through the steam pipeline for preheating. Spray into flash tank. The sludge after thermal hydrolysis is further released in the flash tank, and the released hot steam is returned to the hydrolysis reactor B for preheating.

[0033]The temperature and pressure ...

Embodiment 2

[0035] The remaining sludge after aerobic treatment (with a water content above 99%) is pre-dehydrated with a centrifugal separator or a belt dryer to a water content of 78%, and the pre-dehydrated sludge enters the sludge storage tank and is mixed with the rest The reflux sludge is mixed, and the mixed sludge enters the hydrolysis reactor A after passing through the crusher, and is heated and pressurized to 180°C and 0.7Mpa by injecting hot steam (the sludge heating stage in the hydrolysis reactor A, and the hydrolysis reactor B starts Feeding), thermal hydrolysis 30min.

[0036] After the hydrolysis reaction in the hydrolysis reactor A is completed, the hot steam enters the hydrolysis reactor B through the steam pipeline for preheating. Spray into flash tank. The thermally hydrolyzed sludge is further released in the flash tank, and the released hot steam is returned to reactor B for preheating.

[0037] The temperature and pressure in the hydrolysis reactor B reached 180°...

Embodiment 3

[0039] The remaining sludge after aerobic treatment (with a water content above 99%) is pre-dehydrated with a centrifugal separator or a belt dryer until the water content is 75%, and the pre-dehydrated sludge enters the sludge storage tank and is mixed with the rest The reflux sludge is mixed, and the mixed sludge enters the hydrolysis reactor A after passing through the crusher, and is heated and pressurized to 165°C and 0.6Mpa by injecting hot steam (the sludge heating stage in the hydrolysis reactor A, and the hydrolysis reactor B starts Feeding), thermal hydrolysis 90min.

[0040] After the hydrolysis reaction in the hydrolysis reactor A is completed, the hot steam enters the hydrolysis reactor B through the steam pipeline for preheating. Spray into flash tank. The sludge after thermal hydrolysis is further released in the flash tank, and the released hot steam is returned to the hydrolysis reactor B for preheating.

[0041] The temperature and pressure in the hydrolysi...

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Abstract

The invention discloses a sludge pyrolytic digestion process for efficiently recovering heat energy and equipment thereof. The process comprises the following steps of using excess active sludge as raw materials, heating and pressurizing a hydrolyzing reactor with heated steam, performing pyrohydrolysis for 30-90 min at 150-180 DEG C and 0.5-0.7 Mpa; after the completion of the reaction, back flowing the heated steam to the other group of hydrolyzing reactor to perform preheating, blowing the sludge into a flash tank when the pressure is dropped at 0.2-0.3 Mpa, further releasing the steam and back flowing to another hydrolyzing reactor; further diluting the sludge discharged from the flash tank to a moisture content of 88-92% after being cooled to 50-55 DEG C by a heat exchanger, and finally entering an anaerobic digestion pond to perform high temperature anaerobic digestion reaction, wherein the temperature in the pond is controlled at 50 DEG C to 58 DEG C. The process provided by the invention can be used for increasing the feed concentration and shortening the staying time; after the adoption of pyrohydrolysis pretreatment, the treatment capability of the anaerobic digestion system is increased by 2-3 times and the content of methane reaches 65%. Moreover, a plurality of pyrohydrolysis reactors connected in parallel are further adopted in the invention, the heated steam can be efficiently reused through a heat energy recovering system, so that the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, in particular to a sludge pyrolysis digestion process for efficiently recovering heat energy and equipment used in the process. Background technique [0002] In recent years, with the rapid development of my country's economy and the continuous strengthening of the country's environmental pollution control, the efficiency of my country's sewage treatment has been gradually improved. At the same time, a large amount of surplus sludge is generated in the process of sewage treatment to be treated. [0003] The remaining sludge treatment methods mainly include aerobic digestion process and anaerobic digestion process. Among them, aerobic digestion has the disadvantages of high energy consumption and low efficiency; and a large amount of organic matter in sludge can be reduced by anaerobic digestion. volume, destroy pathogenic microorganisms, improve sludge stability and biogas production, an...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/10C02F11/04
CPCY02E50/343Y02E50/30Y02W10/40
Inventor 宋海农杨崎峰张健陈楠朱琦苏丽梅周永信
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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