Sludge drying system utilizing waste heat

Abstract

The invention relates to a sludge drying system utilizing waste heat. The system includes a heat pump device, an air course, and a sludge drying device. The system is characterized in that: it also includes a steam supply port, by which steam is led out to drive a compressor in the heat pump device. The compressor is a steam driven compressor. Working medium air in the air course is heated by a condensing heat exchanger of the heat pump device, and then enters the sludge drying device to dry sludge. The generation of a heat source by the steam driven heat pump can make efficient use of the pressure energy of high pressure steam, and meanwhile, the combination of generated low pressure exhausted steam, flue gas and other high temperature heat sources can be used to heat working medium air so as to generate working medium air at different temperatures. By heating sludge of different humidity with air at different temperatures, the sludge drying effect can be improved comprehensively.

Description

technical field [0001] The invention relates to a sludge drying system, in particular to a sludge drying system utilizing steam waste heat. Background technique [0002] In the factory, there are often high-temperature steam exhaustion, or when the boiler is selected, in order to meet part of the high-temperature and high-pressure working conditions, another part of the steam needs intermediate decompression, so the process of steam exhaustion and intermediate decompression Will cause the waste of steam energy. [0003] The use of heat pumps in sludge drying systems is already a relatively common technical means. Heat pumps can achieve less high-quality energy and obtain more than three times the low-grade heat energy. However, heat pumps cannot be used for high-temperature steam energy. Under high temperature conditions, the pressure will be very high, far exceeding the heat absorption capacity of existing heat pumps. For example, if heat is absorbed from steam above 100 d...

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Problems solved by technology

[0002] In the factory, there are often high-temperature steam exhaustion, or when the boiler is selected, in order to meet part of the high-temperature and high-pressure working conditions, another part of the steam needs intermediate decompression, so the process of steam exhaustion and intermediate decompression waste of steam energy

[0003] The use of heat pumps in sludge drying systems is already a relatively common technical means. Heat pumps can achieve less high-quality energy and obtain more than three times the low-grade heat energy. However, heat pumps cannot be used for high-temperature steam energy. Under high temperature conditions, the pressure will be very high, far exceeding the heat absorption capacity of existing heat pumps, such as absorbing heat from steam above 100 degrees, and its evaporator is far beyond the capacity of existing refrigeration systems

Different from other gases such as flue gas, high-temperature steam has high pressure in addition to high temperature, and directly using this steam to heat sludge is a waste of high-grade energy. How to use this energy efficiently has become a current issue. the problem we are facing

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