Frostless multivariable coupled type heat pump hot blast stove system

Abstract

A frostless multivariable coupled type heat pump hot blast stove system is used for providing hot air for grain drying. A first heat exchanger, a second heat exchanger and a heat pump unit composed ofa compressor, a condenser, a throttle device, an evaporator and a gas-liquid separator are arranged in the system. Through heat pipeline connection arrangement of the first heat exchanger, the secondheat exchanger and the heat pump unit, a preheating zone, a low temperature zone, a medium temperature zone and a high temperature zone which form heat gradient ascent in sequence from a fresh air inlet to a fresh air outlet are formed on an air supply pipeline. By means of the arrangement, temperature gradient ascent of fresh air and heat gradient utilization from the fresh air inlet to the fresh air outlet are achieved. By arranging a frostless solution circulation pipeline, frostless operation in winter is achieved. A solution achieving frostless operation in the frostless solution circulation pipeline flows back through self gravity. Water is precipitated from the dilute solution flowing back in the frostless solution circulation pipeline in a heat exchange mode, heat exchange heat isprovided by waste heat of the heat pump unit, and no other heat pump unit is additionally arranged.

Description

technical field [0001] The invention belongs to the field of grain drying equipment, and in particular relates to a frost-free, multivariable coupling type heat pump hot blast stove system. Background technique [0002] In recent years, my country's grain drying machinery and equipment industry has achieved rapid development, but as a whole, it is still in a stage of relatively chaotic market, backward product technology, poor innovation ability, weak R&D ability, and high one-time purchase cost. Regulations, market level, technical level, etc., promote the sustainable, healthy and orderly development of the dryer industry. The existing grain drying technologies include natural air drying, sun drying, burning chemical fuel drying, electric heating, infrared, microwave drying, etc. These technologies consume a lot of energy, cause serious pollution, low efficiency and poor safety. Obviously, these old-fashioned drying technologies Equipment is not in line with the sustainable...

AI Technical Summary

Problems solved by technology

However, the heat pump hot blast stoves on the market are just at the stage of promotion, and there are still many technologies that need innovation and breakthroughs

[0004] At present, there are still some problems in the heat pump hot blast stoves used in the market: 1. When the system is running in winter, the outdoor ambient temperature is low, the evaporation temperature is lowered, and a thick layer of frost is easy to form on the surface of the evaporator, which will cause the performance of the unit to decline, or even malfunction. Heat exchange, when the unit fails and shuts down, the traditional defrosting method needs to be shut down or reverse defrosting, resulting in low drying efficiency

2. When the system is running in summer, the outdoor ambient temperature is high, which increases the condensation temperature of the system. After the fresh air passes through the condenser, the heat in the condenser cannot be completely released, resulting in a large amount of waste of heat and reducing the operating efficiency of the system. Grain Drying Has Adverse Effects

3. After the fresh air flows through the heat exchanger at the same temperature, it is difficult to increase the air temperature to the required temperature

4. When the system is running in winter, because the temperature of the condenser on the air inlet side is very low, the condensation effect is good, resulting in low high and low pressure of the system, the cycle power of the unit is difficult to guarantee, and the energy efficiency of the unit is poor.

At the same time, the evaporation pressure of this system is low, and the evaporation side fins are more likely to frost

5. The system on the air outlet side of the unit has a high temperature on the air outlet side, and the condensation temperature of the last system is high. This system is always in a high-load operation state, and the life of the compressor will be greatly reduced.

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