Method for applying sludge heat drying and sludge digestion fermentation in combining way

A combined application and sludge technology, applied in the field of environmental protection and pollutant treatment, can solve the problems of no connection, high moisture content, pollution, etc., and achieve the effect of energy saving

CN101628778BInactive Publication Date: 2011-04-20CHINA METALLURGICAL ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-04-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for applying sludge heat drying and sludge digestion fermentation in a combining way; a condensing-type heat exchanger is arranged between a sludge heat drying system and a sludge digestion fermentation system and is divided into a high temperature end and a low temperature end, wherein the high temperature end is connected with the sludge heat drying system, andthe low temperature end is connected with the sludge digestion fermentation system; when in the process of sludge heat drying, high temperature steam or high humidity gas generated by the sludge heatdrying system enters into the high temperature end of the condensing-type heat exchanger for heat exchange, the temperature of the gas is reduced to be 40-50 DEG C, and the moisture in the gas is condensed to form condensate water; liquid in a digestion system at the low temperature end of the condensing-type heat exchanger is heated, and the heating temperature is more than 35 DEG C; the liquid is then transmitted into the sludge digestion fermentation system connected with the condensing-type heat exchanger and used for supplying the heat needed in the process of sludge digestion fermentation; the sludge digestion fermentation system is connected with the sludge heat drying system by a pipeline, so that methane generated by the sludge digestion fermentation system is input into the sludge heat drying system to be taken as fuel for heating sludge.
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Description

Technical field:

[0001] The invention relates to a combined application method of thermal drying of sludge and sludge digestion and fermentation, which uses the heat energy of high-temperature steam or high-temperature and high-humidity gas generated in the process of drying urban sludge to heat the sludge digestion and fermentation system technology, thereby replacing the role of the heating system in biogas production, saving the daily heat energy consumption of the system and reducing operating costs. The invention belongs to the technical field of environmental protection and pollutant treatment. Background technique:

[0002] With the rapid development of my country's national economy, the continuous acceleration of urbanization and the increasing public demand for environmental quality, a large number of urban sewage treatment plants across the country have been built and put into operation, facing the problem of how to deal with the large amount of surplus sludge gene...

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Embodiment Construction

[0027] The technical solutions of the present invention will be further described below in combination with specific embodiments.

[0028] The sludge thermal drying system is mainly composed of a thermal oil heating furnace, a heat exchanger and a fluidized bed; the sludge digestion and fermentation system is mainly composed of a biogas tank, between the sludge thermal drying system and the sludge digestion and fermentation system, Set up a condensing heat exchanger, the condensing heat exchanger is divided into a high temperature end and a low temperature end, the condensing heat exchanger is provided with a pair of gas inlet and outlet, connected with the fluidized bed gas inlet and outlet; a digestive system liquid inlet; System liquid outlet, connected with biogas tank;

[0029] Wherein, if the sludge thermal drying system is composed of a thermal oil heating furnace, a heat exchanger and a non-fluidized bed drying system, the exhaust port at the hot end of the condensing ...