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Mud drying system and use method thereof

A technology for sludge drying and sewage, applied in heat recovery system, dehydration/drying/concentrated sludge treatment, refrigeration and liquefaction, etc., can solve the problems of restricting the promotion of sludge treatment technology and high cost of thermal drying, and achieve effective Conducive to resource utilization, increase drying output, and reduce the effect of drying energy consumption

Active Publication Date: 2010-01-06
TSINGHUA UNIV +3
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The current sludge thermal drying technology either uses high-temperature flue gas to dry directly, or uses exhaust gas to preheat air or heat transfer oil to dry, or uses waste heat boiler to generate steam for drying. The heat source of these methods either comes from conventional fuel combustion, or from the addition of conventional fuel The burning of dry sludge and the cost of thermal drying are very high, which seriously restricts the promotion of sludge treatment technology

Method used

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  • Mud drying system and use method thereof
  • Mud drying system and use method thereof
  • Mud drying system and use method thereof

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Such as figure 1 As shown, the present invention includes a transcritical heat pump auxiliary heating loop 10 , a heat pump auxiliary heating loop 20 , an air heating and waste heat recovery loop 30 and a hot water circulation loop 40 .

[0023] Such as figure 2As shown, the transcritical heat pump auxiliary heating loop 10 of the present invention includes a heat pump working fluid adopting an evaporator 11 of R134a (tetrafluoroethane), an internal heat exchanger 12, a compressor 13, a gas cooler 14 and A throttle valve 15 . The heat pump working fluid outlet of the evaporator 11 is connected to the internal heat exchanger 12 , and the internal heat exchanger 12 is connected to an inlet of the gas cooler 14 through the compressor 13 . A corresponding outlet of the gas cooler 14 is connected to the internal heat exchanger 12 through a pipel...

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Abstract

The invention relates to a mud drying system and a use method thereof. The mud drying system comprises a transcritical heat pump auxiliary heat supplying loop, a heat pump auxiliary heat supplying loop, an air heating and waste heat recovering loop and a hot water circulation loop; the transcritical heat pump auxiliary heat supplying loop comprises an evaporator, an internal heat exchanger, a compressor, a gas cooler and a throttle valve; the heat pump auxiliary heat supplying loop comprises an evaporator, a wastewater and waste heat recovering evaporator, an internal heat exchanger, a compressor, a condenser, a throttle valve, two stop valves and a wastewater tank; the air heating and waste heat recovering loop comprises a hothouse, an air compressor, a gas discharging and carrying port, a first evaporator, the other evaporator and a condenser; and the hot water circulation loop comprises a pump, a hothouse and the condenser in the heat pump auxiliary heat supplying loop. The invention adopts the hothouses to obtain solar energy to heat mud and utilizes the transcritical heat pump auxiliary heat supplying loop and the heat pump auxiliary heat supplying loop to recover the sensible heat and the latent heat in humid air to heat mud, thereby lowering the energy consumption for drying the mud. The invention can be widely applied to various mud processing fields.

Description

technical field [0001] The invention relates to a sludge treatment system and its use method, in particular to a sludge drying system and its use method which use solar energy and a dual heat pump circulation device for auxiliary heat supply. Background technique [0002] According to the latest statistics from the Ministry of Environment, as of 2007, 1,178 urban sewage treatment facilities have been put into operation in my country, with a total design treatment capacity of 72.43 million tons per day, and an average of 53.2 million tons of sewage per day. According to this, in 2007, the national water content rate was 80%. The sludge sludge cake is about 14.6 million tons. The harmless treatment rate of sludge in my country is very low, even in developed cities, it is only 20% to 25%, becoming the most important secondary pollution source of urban sewage treatment. The ever-increasing amount of sludge production is in sharp contradiction with the serious shortage of sludge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12F24J2/00F25B30/06
CPCY02B30/123Y02B30/52Y02E10/40Y02W10/37
Inventor 姜培学张富珍曲颂华袁锡强李星文
Owner TSINGHUA UNIV
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