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MVR (Mechanical Vapor Recompression) superheated steam sludge continuous drying system and working method

A working method, drying system technology, applied in chemical instruments and methods, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. the effect of improving the drying rate

Inactive Publication Date: 2017-03-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, when superheated steam is used as the drying medium, when the drying system is still at normal pressure, the drying temperature must be above 100°C, which limits the use of superheated steam drying system

Method used

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  • MVR (Mechanical Vapor Recompression) superheated steam sludge continuous drying system and working method

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Embodiment Construction

[0015] Refer below figure 1 Explain the working process of a MVR superheated steam sludge continuous drying system.

[0016] First close the first valve 14, the seventh valve 23, the sixth valve 19, the twelfth valve 28, open the second valve 15, the third valve 16, the fourth valve 17, the fifth valve 18, the eighth valve 24, the second valve The ninth valve 25, the tenth valve 26, the eleventh valve 27, and the thirteenth valve 29 are vacuumed by the vacuum pump 13, so that the dryer is in a negative pressure working state.

[0017] Then close the second valve 15, the third valve 16, the fourth valve 17, the fifth valve 18, the eighth valve 24, the ninth valve 25, the tenth valve 26, the eleventh valve 27, the thirteenth valve 29, open The first valve 14, the seventh valve 23, the sludge 30 to be dried enters the first feeding device 1 and the second feeding device 20, closes the first valve 14, the seventh valve 23, opens the second valve 15, the eighth valve Valve 24, us...

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Abstract

The invention provides an MVR (Mechanical Vapor Recompression) superheated steam sludge continuous drying system and a working method and belongs to the field of energy sources, power and the like. Compared with a traditional sludge drying system, the system is characterized in that a dryer (3) is adopted; superheated steam (31) and sludge to be dried are subjected to direct heat exchange, and a control valve is switched on and off to enable a first feeding device (1), a first pre-heater (2), a second feeding device (20), a second pre-heater (21), a first sludge storage tank (11) and a second sludge storage tank (22) to alternately work, so that negative-pressure continuous operation in the dryer (3) is realized; according to the system provided by the invention, the superheated steam (31) with a relatively strong moisture absorption capability is used as a drying medium under a negative-pressure environment, so that the sludge drying speed is greatly improved; meanwhile, the system only consumes less power consumption of a compressor (7) and a draught fan (10) and latent heat of most steam evaporated from sludge (30) is recycled through a heat exchanger (9); and an efficient and energy-saving sludge drying method is provided.

Description

technical field [0001] The invention relates to an MVR superheated steam sludge continuous drying system and a working method, belonging to the field of energy and power. Background technique [0002] At present, the total annual wastewater discharge in my country exceeds 40 billion tons, and the annual sludge discharge is about 5.5 to 6 million tons, and it continues to increase. It is estimated that by 2020, my country's sludge output will reach 8000t / a, and with the development of large urbanization and urban cluster areas, my country's sludge treatment will eventually move towards tertiary treatment such as drying or incineration. Reducing the moisture content of sludge is the key to solving many problems encountered in the sludge treatment process, and it is the premise of sludge recycling (agricultural use, incineration, etc.) treatment, disposal and utilization. [0003] Conventional sludge drying uses hot air as the drying medium, and the hot air contacts the sludge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
CPCC02F11/12C02F2301/063C02F2303/10
Inventor 韩东白桂培岳晨何纬峰蒲文灏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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