CN102536297A - Cold conveying system of mine air-conditioning and working method of cold conveying system - Google Patents

Abstract

The invention discloses a mine air-conditioning cold delivery system and its working method, which comprises refrigeration equipment arranged on the ground, a heat exchanger arranged in the underground, an air cooler arranged at the cooling working point of the well, the evaporator of the ground refrigeration equipment and the The downhole heat exchanger forms a closed circulation system through pipelines, and the circulation system is filled with refrigerant, which is called a refrigerant circulation system; the downhole heat exchanger and air cooler form a closed circulation system through pipelines and circulation pumps, and the circulation system Filled with cold water, called cold water circulation system. The cooling of the downhole working point is realized through the cooling system mentioned above. The system of the invention realizes the objectives of low energy consumption, good cooling effect and low cost of the mine air-conditioning cooling system.

Description

Mine air-conditioning cooling system and its working method

technical field

The invention relates to a mine air-conditioning cold delivery system, in particular to a system and a method for transporting cold energy by refrigerant circulation in a mine vertical shaft.

Background technique

At present, the mining depth of coal mines in my country is mostly above 800m and is gradually increasing. The degree of comprehensive mechanization continues to increase, and the heat emitted from geothermal heat and underground equipment to the underground air has increased significantly. The heat release of surrounding rocks not only increases the temperature in the mine, but also increases the humidity; the high temperature and high humidity environment in the mine seriously affects the health and production efficiency of underground workers, and has caused disasters - heat damage. Mine heat damage will eventually become the decisive factor restricting the depth of mineral mining. Therefore, mine air conditioners must be used to reduce the temperature and dehumidify the mine to eliminate underground heat damage.

At present, the refrigeration equipment of mine air conditioners can be arranged underground and on the ground. When the refrigeration equipment is placed underground, it is necessary to excavate a special large-scale equipment chamber. At the same time, the refrigeration equipment is required to meet the coal mine explosion-proof standards, compact equipment and high reliability. Commonly mature refrigeration equipment cannot meet these requirements, and Another key problem when the refrigeration equipment is placed underground is that the refrigerator does not discharge heat smoothly, which greatly reduces the refrigeration coefficient (cop) of the refrigerator.

Therefore, at present, refrigeration equipment is generally arranged on the ground, and ordinary refrigerators can be used on the ground, which have a high cooling coefficient, reduce cooling power consumption, and facilitate operation management and equipment maintenance. . The system layout and existing deficiencies of the above three cold delivery methods are:

1. Cold air conveying type:

The layout form of the cold air conveying system is: arrange the cooling air equipment and the air cooler on the ground, and use the air pipe to send the cold air to the downhole cooling working point. The existing deficiencies are: first, due to the large air volume and air duct size, there are inconvenient installation and high energy consumption; second, the loss of cooling capacity is large, and the cooling effect is poor; third, the wind transported underground needs to be pumped by mine fans. Putting it on the well will increase the power consumption of the mine fan.

2. Ice conveying type:

The layout form of the ice conveying system is: the ice making equipment is arranged on the ground, and the ice produced on the ground is sent to the cooling point in the well through the ice delivery pipeline to absorb heat and cool down. (lower than -5°C) to make ice, so the cooling coefficient (COP) of the refrigerator is reduced, and there are complicated ice making and ice delivery system equipment; second, the crushed ice is easy to block the ice delivery pipeline during the delivery process; After the ice transported to the underground is melted into water, it needs to be drained to the well by a water pump, which causes waste of water and greatly increases the cost of cooling.

3. Cold water conveying type:

The layout of the cold water delivery system is as follows: arrange cooling water equipment and heat exchangers on the ground, install an air cooler at the cooling point of the well, connect the cold water produced on the well with the air cooler through the cold water circulation pipeline, and circulate the cold water to make the air cooler For cold air, the water coming out of the air cooler returns to the heat exchanger for heat exchange and then enters the cooling water equipment. Compared with cold air delivery, the pipe diameter can be reduced. But there are also the following deficiencies: First, because the cold water pipeline is in the mine shaft with a depth of more than 800m, the hydrostatic pressure is too large for conventional pipelines; Or high-pressure heat exchangers, such equipment is mainly imported from abroad, which is expensive; so this method is not advisable and cannot be promoted on a large scale. The third is that the cold water needs a high-pressure water pump to circulate during the circulation process, which increases the cost of cooling.

Contents of the invention

The purpose of the present invention is to overcome the technical defects of high energy consumption, poor cooling effect and high cost in the existing mine air-conditioning cooling system, and provide a new mine air-conditioning cooling system and method.

In order to achieve the above object, the technical scheme and working principle thereof taken by the present invention:

A mine air-conditioning cooling system, which includes refrigeration equipment, heat exchangers and air coolers, characterized in that the refrigeration equipment is arranged on the ground, the heat exchanger is arranged underground, and the air cooler is arranged at the cooling working point of the mine; The evaporator of the refrigeration equipment and the downhole heat exchanger form a closed circulation system through the pipeline, and the circulation system is filled with refrigerant, which is called the refrigerant circulation system; the downhole heat exchanger and the air cooler form a closed circulation system through the pipeline and the circulation pump. The circulatory system, which is filled with cold water, is called a cold water circulatory system.

The above-mentioned refrigerants are preferably Freon and ammonia.

The working method of the system is: turn on the ground refrigeration equipment, the refrigerant enters the tube side of the downhole heat exchanger through the refrigerant process pipe, exchanges heat with the cold water in the shell side of the heat exchanger, and undergoes a liquid-gas phase change, thereby evaporating into Gas state, under the action of evaporation pressure, the gaseous refrigerant automatically rises to the evaporator of the ground refrigeration equipment through the refrigerant return pipeline, and the gas-liquid phase changes into a liquid refrigerant under the cooling action of the refrigeration equipment. Under the action of gravity, the cold energy carried is transported to the downhole heat exchanger through the refrigerant process pipeline, where it is re-evaporated into a gaseous refrigerant, and the circulating flow realizes the automatic delivery of cold energy to the downhole heat exchanger; at the same time, the underground cold water circulation pump is turned on to transfer the heat The cold water of the device is sent to the air cooler, and the circulating flow realizes the cooling of the working point.

The present invention has the following advantages due to the adoption of the above technical scheme:

1. Due to the use of refrigerant circulation to realize cold delivery, the cold delivery depends on the phase change process of the refrigerant. The cooling delivery capacity of the refrigerant per unit mass flow is much greater than that of cold air and cold water. Therefore, when delivering the same cooling, The refrigerant circulation flow is much smaller than the cold air and cold water flow, and the liquid refrigerant pipe diameter is much smaller than the cold water pipe diameter.

2. Since the liquid refrigerant flows from the evaporator of the ground refrigeration equipment to the downhole heat exchanger relying on gravity, and the power of the gaseous refrigerant flowing from the downhole heat exchanger to the ground is the evaporation pressure difference, no other power equipment is needed, and the cooling cost is greatly reduced .

3. Since the heat exchanger is installed underground, the cold water transport distance is shortened, the cold transport loss and the power consumption of the cold water circulation pump are reduced, and the cold transport efficiency is improved, thereby improving the cooling effect.

4. Since the diameter of the liquid refrigerant pipeline is thin, the smaller the diameter of the pipe with the same wall thickness and the lower the pipe material, the stronger the pressure resistance. In addition, depending on the flow rate of the refrigerant, the liquid refrigerant pipeline is made into multiple parallel connections Pipes with smaller diameters are used to overcome the static pressure of the liquid in the liquid refrigerant pipes, so that the heat exchanger can use ordinary heat exchangers, and there is no need to set up special high-low pressure converters or high-pressure heat exchangers, which costs a lot Reduced and easy to promote in a large area.

5. Due to the small flow of refrigerant in the downhole heat exchanger, copper tubes with small diameters can be used. Appropriately increasing the wall thickness of the copper tubes can overcome the static pressure of the liquid refrigerant. The heat exchanger uses copper tubes to improve heat transfer coefficient.

6. The refrigerant used in the present invention can be Freon or ammonia, which has wide adaptability.

As a novel cooling system, the present invention can be widely used in cooling other mines.

Description of drawings

Fig. 1 is a system diagram of the present invention.

In the figure: 1-liquid refrigerant pipeline, 2-gas refrigerant pipeline, 3-refrigeration equipment, 4-heat exchanger, 5-cold water circulation pump, 6-cold water circulation pipeline, 7-air cooler.

Detailed ways

As shown in Figure 1, a mine air-conditioning cooling system is arranged with refrigeration equipment 3 on the ground, a heat exchanger 4 is arranged underground, and an air cooler 7 is arranged at the cooling working point of the well; wherein, the heat exchanger 7- Refrigerant flows on one side, and cold water flows on the other side. The evaporator inlet of the ground refrigeration equipment 3 and the refrigerant outlet of the downhole heat exchanger 4 are connected by a gaseous refrigerant pipeline 2. The evaporator outlet of the ground refrigeration equipment 3 and the downhole heat exchanger The refrigerant inlets of the heater 4 are communicated with liquid refrigerant pipes 1 to form a closed piping system, and a certain amount of liquid refrigerant is filled in the piping system; the cold water side of the downhole heat exchanger 4 The air cooler 7 of the cooling working point in the well is communicated with through the cold water circulation pipe 6, and a cold water circulating pump 5 is connected in series to the circulating pipe 6, so as to realize the circulation of cold water in the air cooler 4 and lower the temperature of the working point of the cooling down well.

The working method of this system is: turn on the ground refrigeration equipment 3, the liquid refrigerant undergoes heat exchange in the downhole heat exchanger 4 and undergoes a liquid-gas phase change, thereby evaporating into a gaseous state, and the evaporation pressure of the gaseous refrigerant in the downhole heat exchanger 4 Under the action, the gaseous refrigerant pipeline 2 automatically rises to the evaporator of the ground refrigeration equipment 3, and the gaseous refrigerant undergoes a gas-liquid phase transition under the cooling action of the refrigeration equipment, absorbing cold energy and condensing into liquid refrigerant, and the liquid refrigerant Under the action of gravity, the cold energy is transported to the downhole heat exchanger 4 through the liquid refrigerant pipeline 1 by its own weight, and then evaporated into a gaseous refrigerant, so that the cold energy can be automatically transported to the downhole heat exchanger 4 through circulating flow; at the same time, the downhole cold water is turned on The circulating pump 5 transports the cold water from the heat exchanger 4 to the air cooler 7, so that the circulating flow realizes the cooling of the working point.

Claims (3)

1. a mine air conditioner is failed cooling system, and it comprises chiller plant, heat exchanger and air cooler, it is characterized in that, described chiller plant is arranged in ground, and heat exchanger is arranged in the down-hole, and air cooler is arranged in the downhole cooling operating point; The evaporimeter of ground chiller plant and down-hole heat exchanger are filled with cold-producing medium through the circulating system of a sealing of pipeline formation in the circulating system, be called refrigerant-cycle systems; Down-hole heat exchanger and air cooler are filled with cold water through the circulating system of a pipeline and a sealing of circulation pump formation in the circulating system, be called the cold water circulating system.

2. mine air conditioner as claimed in claim 1 is failed cooling system, it is characterized in that, cold-producing medium is freon or ammonia.

3. the method for work of the defeated cooling system of a mine air conditioner according to claim 1 or claim 2; It is characterized in that, at first open the ground chiller plant, cold-producing medium gets into down-hole heat exchanger tube side through cold-producing medium process pipeline; Carry out cold and hot exchange generation liquid-gas phase change with the cold water in the heat exchanger shell pass; Thereby evaporation becomes gaseous state, and gaseous refrigerant is under the evaporating pressure effect, in the cold-producing medium return conduits rises to the evaporimeter of ground chiller plant automatically; Issuing anger-liquid phase at the refrigeration of chiller plant becomes and is liquid refrigerant; Liquid refrigerant under action of gravity, carry cold through cold-producing medium process line transportation to the down-hole heat exchanger, be evaporated to gaseous refrigerant again, circulate with this and realize that cold is to down-hole heat exchanger automatic transport; Open the down-hole cold water circulation pump simultaneously, heat exchanger cold water is transported to air cooler, circulate the cooling that realizes the operating point with this.

Images