Mud drying system and use method thereof

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 ...

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

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