Precise temperature control type heat pump hot blast furnace system

Abstract

The invention discloses a precise temperature control type heat pump hot blast furnace system. A constant-temperature adjusting unit is arranged in the system, and a first basic adjusting terminal anda second basic adjusting terminal are arranged in the constant-temperature adjusting unit; and fixed-frequency adjusting is formed at the first basic adjusting terminal, variable-frequency adjustingis formed at the second basic adjusting terminal, and through cooperation of fixed-frequency adjusting and variable-frequency adjusting, matching of the actual heat supply air temperature and the settemperature is formed. According to the precise temperature control type heat pump hot blast furnace system, input selection of multiple stages of different heating capacities and the precisely-controlled direct-current variable-frequency adjusting system are achieved through innovative design and intelligent control logic of the system when a heat pump hot blast furnace is in various changing working conditions such as external environment temperature changing, heat pump air inlet temperature changing and fin frosting and defrosting for the running specialty of a grain drying heat pump system, the purpose that it is guaranteed that the difference value between the air outlet temperature of a heat pump and the set temperature is kept within + / -0.3 DEG C when the heat pump normally works isachieved, and the quality and the drying capacity of dried materials are guaranteed.

Description

technical field [0001] The invention belongs to the field of grain drying equipment, and in particular relates to a precise temperature control 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 on the whole it is still in a stage where the market is relatively chaotic, product technology is backward, corporate innovation capabilities are poor, research and development capabilities are weak, and one-time purchase costs are high. Laws and regulations, market level, technical level, etc., promote the sustainable, healthy and orderly development of the dryer industry. Existing grain drying technologies include natural air drying, sun drying, chemical fuel drying, electric heating, infrared, microwave drying, etc. Heat pump products do not have any combustion emissions, and the refrigerant is environmentally friendly refrigerant, which has zero polluti...

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

[0003] At present, there are still problems with 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 drops, and a thick layer of frost is easy to form on the surface of the evaporator, which leads to a decrease in the outlet air temperature of the unit , can not meet the drying temperature requirements

2. The products currently on the market are basically composed of multiple compressors. When the inlet air temperature of the heat pump hot blast stove changes, the compressor is automatically loaded or unloaded to meet the set air outlet temperature requirements, but each loading and unloading One compressor, so there will be a temperature fluctuation of about 8 degrees in the outlet air temperature, which will lead to uneven drying temperature of the grain, and poor drying effect in some periods of time

3. When the ambient temperature is low, because the unit needs to defrost, the defrosting air temperature will also decrease, which will affect the stability of the air temperature

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