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Low-water-content dehydrated sludge direct supercritical water gasification processing apparatus and method

A supercritical water gasification and dewatering sludge technology, which is applied in the field of resources and environment, can solve the problems of low treatment efficiency, achieve the effect of reducing clogging and improving sludge flow performance

Active Publication Date: 2012-10-17
HOHAI UNIV
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  • Application Information

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Problems solved by technology

[0004] Technical problem to be solved: Aiming at the problem of low treatment efficiency due to the addition of moisture in the current supercritical water gasification treatment sludge, the present invention provides a direct supercritical water gasification treatment device and method for dewatered sludge with low water content

Method used

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  • Low-water-content dehydrated sludge direct supercritical water gasification processing apparatus and method
  • Low-water-content dehydrated sludge direct supercritical water gasification processing apparatus and method
  • Low-water-content dehydrated sludge direct supercritical water gasification processing apparatus and method

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Embodiment approach 1

[0029] Embodiment 1 Method of direct supercritical water gasification treatment of dewatered sludge

[0030] The dewatered sludge (with a water content of about 84.1%) from a sewage plant in Shenzhen is injected into the liquefaction device through a high-pressure piston pump for pre-liquefaction treatment. The liquefaction temperature is 180°C and the reaction is 30 minutes. After the liquefied product passes through heat exchanger 1, it is boosted to 25MPa with a high-pressure pump, enters the supercritical water gasification reactor and is heated to 600°C. After 2 minutes of reaction, it passes through heat exchanger 4 and cools down to about 200°C. At the same time, the heat exchanger 4 heats part of the high-pressure sludge to 500°C, and then enters the supercritical water gasification reactor. The reaction product after heat exchange by the heat exchanger 4 enters the cooler, and after cooling down to normal temperature, the pressure is reduced to normal pressure through...

Embodiment approach 2

[0039] The device for direct supercritical water gasification treatment of dewatered sludge with low moisture content includes various equipment connected in series in sequence: heat exchanger 1, liquefaction device 2 high-pressure pump 3, heater 5, supercritical water gasification reaction Device 6, cooler 7, pressure reducing valve 8, gas-liquid separator 9, see figure 1 .

Embodiment approach 3

[0041] The difference from Embodiment 2 is that it also includes a heat exchanger 4, and the hot fluid passed into the heat exchanger 4 is the fluid at the outlet end of the supercritical water gasification reaction device 6, so as to recycle the supercritical water gasification reaction and flow out The heat carried by a high temperature fluid, see figure 2 .

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Abstract

In prior arts of sludge processing, water is added for preparing slurry for improving the sludge fluidity, such that the processing efficiency of the dehydrated sludge is reduced. Aiming against the technical problem, the invention provides a low-water-content dehydrated sludge direct supercritical water gasification processing apparatus and a corresponding method. The method is characterized in that: before the dehydrated sludge is directly subjected to supercritical water gasification processing, the sludge is pre-liquefied by using a liquefaction apparatus, such that the sludge fluidity is improved, and a part of the inorganic substances in the sludge is settled. Therefore, subsequent pumping and supercharging can easily be carried out, a blocking risk in pipelines is reduced, sludge processing efficiency is substantially improved, and equipment utilization rate is substantially improved. Also, gas-phase products and heat in the product can be effectively recovered and utilized, such that energy utilization rate is improved, and processing cost is reduced.

Description

technical field [0001] The invention belongs to the field of resources and environment, and in particular relates to a direct supercritical water gasification treatment device and method for dewatered sludge provided by a sewage plant. Background technique [0002] At present, the water content of dewatered sludge in most sewage treatment plants in my country is between 74 and 86%, and it contains a certain amount of solid inorganic matter, which leads to the difficulty of pumping pressurization during sludge treatment; so sewage plants Realizing the harmlessness, reduction and recycling of dewatered sludge has become the focus of researchers, and the treatment and disposal of dewatered sludge has become one of the important issues in my country's environmental protection. In recent years, many scholars have proposed the method of supercritical water treatment. For example, the Chinese patent application document with the patent application number "200810063091.8" published o...

Claims

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Application Information

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IPC IPC(8): C02F11/00C01B3/02
CPCY02P20/54
Inventor 朱伟徐志荣龚淼张会文
Owner HOHAI UNIV
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