Coal mine low-post secondary heat energy resource comprehension utilization system

Abstract

The invention relates to a coal mine low-post secondary heat energy resource comprehension utilization system, which belongs to the technical field of waste heat resource utilization. The system comprises three parts of a heat exchange tower, a swallet utilization subsystem and a mine air exhaust utilization subsystem, wherein the heat exchanger is composed of a diffusion section, a direct contact heat exchange section and an indirect contact heat exchange section which are sequentially communicated. A swallet water source heat pump subsystem comprises a swallet sedimentation tank, and swallet connected through pipelines is sequentially connected on a rotary flow dirt separator, a spray circulation pump and a water source heat pump which are positioned at the lower portion of the swallet sedimentation tank through lifting pumps. The mine air exhaust utilization subsystem comprises a dust removing water blocking plate arranged at the position of an inlet of the indirect contact heat exchange section of the heat exchange tower, a copper tube fin tube type heat exchanger positioned in the indirect contact heat exchange section and an air source heat pump which is connected with the indirect contact heat exchange section through a cooling agent pipeline. The two subsystems achieve collocation and complementary using of the swallet and the mine air exhaust through a spray process of the direct contact heat exchange section. The system saves energy and has the environmentally-friendly function of reducing dust pollution of mine air exhaust and emission of corrosive gas.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of waste heat, and in particular relates to a comprehensive utilization system of low-level secondary heat energy in coal mines using mine water gushing and mine exhaust air as low-temperature heat and cold sources of heat pumps. Background technique [0002] Coal accounts for 70% of China's energy industry and consumption structure. The energy needed for China's economic development relies more on coal. Since 2001, the annual growth rate of China's coal demand has been 12%. The proportion of coal in China's energy supply With an absolute advantage in quantity, the coal industry is also China's leading strategic industry. The coal industry not only provides energy for the society, but also consumes a lot of energy in the production process of coal. Now the coal reserves are decreasing and people's awareness of environmental protection is increasing, which prompts people to reduce the ...

AI Technical Summary

Problems solved by technology

The kinetic energy of the high-speed air flow will blow all or part of the water droplets (mist) sprayed out of the conventional spraying device out of the exhaust tower, not only losing a lot of water, but also causing a lot of heat recovery. To overcome this shortcoming, only large The heat exchange method of direct water flow; however, the height of the exhaust tower is limited, and the heat exchange method of direct shower completes the heat exchange process in a relatively small space and time. The heat exchange process is not sufficient, and the high efficiency of the system is difficult to guarantee

Although the patent 200920021263.5 has improved the process to create a more reasonable air-water heat exchange—using the low-temperature cold water provided by the water source heat pump to perform three-stage high-density reverse spraying on all mine exhaust air, but the three-stage high-density reverse spraying The resistance of sprayed water seedlings is relatively large, which affects the normal exhaust air of the exhaust tower. At the same time, a cover plate is set on the exhaust tower, which changes the structure of the exhaust shaft, which involves the safety of the production personnel of the coal mine. Not allowed by the design specification

[0005] To sum up, the common processes in the utilization process of low-level secondary heat energy in existing coal mines are not suitable for the heat exchange process conditions of the existing heat energy utilization equipment, and the ubiquitous system efficiency is low and the resources are single-used.

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