CN112361446A

CN112361446A - Geothermal heating system

Info

Publication number: CN112361446A
Application number: CN202011086160.4A
Authority: CN
Inventors: 李小龙; 刘亮德; 樊梦芳; 张泽; 陈情来; 陈宇; 王亚彬; 张倩; 杜厚金; 陈鹏; 崔豫; 李云
Original assignee: China National Petroleum Corp; China Petroleum Engineering and Construction Corp
Current assignee: China National Petroleum Corp; China Petroleum Engineering and Construction Corp
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2021-02-12
Anticipated expiration: 2040-10-12
Also published as: CN112361446B

Abstract

The disclosure relates to a geothermal heating system, and belongs to the field of geothermal heating. Geothermal heating system includes: a heat transfer tank and a vacuum device. The heat transfer tank is provided with a hot water storage cavity, a geothermal water storage cavity, a hot water inlet, a hot water outlet, a geothermal water inlet and a geothermal water outlet. The hot water storage cavity is respectively communicated with the hot water inlet and the hot water outlet, the geothermal water storage cavity is respectively communicated with the geothermal water inlet and the geothermal water outlet, and the top parts of the hot water storage cavity and the geothermal water storage cavity are communicated. The vacuum device removes non-condensable gas in the heat transfer tank, maintains the vacuum degree in the heat transfer tank and evaporates geothermal water in the geothermal water storage cavity. The steam generated by evaporation contacts with the hot water to realize mass and heat transfer, so that the temperature of the hot water is increased. Meanwhile, the steam has high cleanliness relative to geothermal water, does not pollute the quality of the hot water, is not easy to generate scale, and does not influence the heat transfer effect.

Description

Geothermal heating system

Technical Field

The present disclosure relates to the field of geothermal heating, and more particularly, to a geothermal heating system.

Background

The geothermal heating system is a heating system which uses geothermal energy as a main heat source. The geothermal heating system may be divided into a direct heating system and an indirect heating system according to a manner in which geothermal water flows into the geothermal heating system.

The direct heat supply system directly introduces geothermal water into the direct heat supply system, mixes the geothermal water and the hot water in the direct heat supply system, increases the temperature of the hot water, and then outputs the hot water with the increased temperature for heat supply. However, the quality of the geothermal water is poor, and the geothermal water can contact with the hot water in the direct heating system, thereby affecting the quality of the hot water.

Disclosure of Invention

The embodiment of the disclosure provides a geothermal heating system, which does not affect the quality of hot water and the heat transfer effect. The technical scheme is as follows:

the present disclosure provides a geothermal heating system, the geothermal heating system including:

the heat transfer tank is provided with a hot water storage cavity, a geothermal water storage cavity, a hot water inlet, a hot water outlet, a geothermal water inlet and a geothermal water outlet, the hot water storage cavity is respectively communicated with the hot water inlet and the geothermal water outlet, the geothermal water storage cavity is respectively communicated with the geothermal water inlet and the geothermal water outlet, and the top of the hot water storage cavity is communicated with the top of the geothermal water storage cavity;

and the vacuum device is used for exhausting non-condensable gas in the heat transfer tank, maintaining the vacuum of the heat transfer tank and evaporating the geothermal water in the geothermal water storage cavity.

In one implementation of the disclosed embodiment, the heat transfer tank includes:

a tank, the hot water supply inlet and the geothermal water inlet being located at an upper portion of the tank;

a first sprayer and a second sprayer in the tank body, the first sprayer being located at an upper portion of the geothermal water storage chamber and communicating with the geothermal water inlet, the second sprayer being located at an upper portion of the hot water storage chamber and communicating with the hot water inlet.

In one implementation of the disclosed embodiment, the heat transfer tank has two of said hot water supply inlets;

the heat transfer tank includes two of the second sprayers, which are respectively communicated with the two hot water supply inlets and are located at different heights.

In one implementation of the disclosed embodiment, the heat transfer tank further comprises:

the baffle is located the jar is internal, the baffle will the inner chamber of the jar body divide into the hot water storage chamber with geothermal water storage chamber, the top of baffle is connected with the top of the jar body, the top of baffle has a plurality of passageways.

In one implementation manner of the embodiment of the present disclosure, the geothermal heating system further includes:

the first water outlet pump is communicated with the hot water supply outlet;

the opening and closing valve is provided with an input port, an output port and a pressure signal input port, the pressure signal input port is communicated with an outlet of the first water outlet pump, the input port is used for inputting hot water, and the output port is communicated with the hot water supply inlet.

one end of the first flow control valve is communicated with the hot water supply inlet, and the other end of the first flow control valve is communicated with the geothermal water outlet;

a first liquid level meter located in the hot water storage chamber;

the controller is respectively electrically connected with the first liquid level meter and the first flow control valve, and is configured to control the valve opening degree of the first flow control valve to increase when the liquid level measured by the first liquid level meter is higher than a first liquid level, and control the valve opening degree of the first flow control valve to decrease when the liquid level measured by the first liquid level meter is lower than a second liquid level, wherein the first liquid level is higher than the second liquid level.

a second flow control valve in communication with the hot water supply inlet;

a third flow control valve communicated with the hot water supply outlet;

the controller is electrically connected with the second flow control valve and the third flow control valve respectively, and is configured to control the second flow control valve to close when the liquid level measured by the first liquid level meter is higher than a third liquid level, and control the third flow control valve to close when the liquid level measured by the first liquid level meter is lower than a fourth liquid level, wherein the third liquid level is higher than the first liquid level, and the second liquid level is higher than the fourth liquid level.

the fourth flow control valve is communicated with the geothermal water outlet;

a second liquid level meter positioned in the geothermal water storage cavity;

wherein the controller is electrically connected to the second liquid level meter and the fourth flow control valve, respectively, and the controller is configured to control the valve opening degree of the fourth flow control valve to increase when the liquid level measured by the second liquid level meter is higher than a fifth liquid level, and to control the valve opening degree of the fourth flow control valve to decrease when the liquid level measured by the second liquid level meter is lower than a sixth liquid level, and the fifth liquid level is greater than the sixth liquid level.

a fifth flow control valve in communication with the geothermal water inlet;

wherein the controller is electrically connected with the third flow control valve, and the controller is configured to control the fifth flow control valve to close when the liquid level measured by the second liquid level meter is higher than a seventh liquid level, and control the fourth flow control valve to close when the liquid level measured by the second liquid level meter is lower than an eighth liquid level, wherein the seventh liquid level is higher than the fifth liquid level, and the sixth liquid level is higher than the eighth liquid level.

the temperature transmitter is communicated with the hot water supply outlet;

wherein the controller is electrically connected to the temperature transmitter, and the controller is configured to control the valve opening degree of the fifth flow control valve to increase when the temperature measured by the temperature transmitter is lower than a first temperature.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

in the embodiment of the disclosure, geothermal water is input into the geothermal water storage cavity of the heat transfer tank through the geothermal water inlet, and hot water is input into the hot water storage cavity of the heat transfer tank through the hot water supply inlet. The hot water supply and the geothermal water are respectively arranged in the two storage cavities and cannot be in direct contact, and the geothermal water cannot pollute the quality of the hot water. The vacuum device removes non-condensable gas in the heat transfer tank, maintains vacuum in the heat transfer tank, reduces the boiling point of water in the heat transfer tank under the condition that the heat transfer tank is in vacuum, and evaporates water vapor from geothermal water in the geothermal water storage cavity due to higher temperature of the geothermal water. The geothermal water evaporates the steam that sends and constantly increases, and steam has mobility simultaneously, because the top that heat transfer jar is being close to in the geothermal water storage chamber and geothermal water storage chamber is intercommunication each other, steam can flow to the hot water storage chamber, and steam and the hot water supply in the hot water storage chamber intensive mixing carry out the mass transfer heat transfer, make the temperature rise of the hot water supply in the hot water storage chamber. The hot water with the increased temperature flows out through the hot water supply outlet and is used for supplying heat. The geothermal water with the reduced temperature flows out through the geothermal water outlet and enters the next stage to be discharged or flows to the ground again for heating. Because the hot water is contacted with the evaporated water vapor to realize heat transfer, the temperature of the hot water is increased. Meanwhile, the steam has high cleanliness relative to geothermal water, does not pollute the quality of the hot water, is not easy to generate scale, and does not influence the heat transfer effect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a geothermal heating system according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a geothermal heating system according to an embodiment of the disclosure;

FIG. 3 is a side view of a separator plate provided by an embodiment of the present disclosure;

fig. 4 is a block diagram of a geothermal heating system provided in an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a geothermal heating system according to an embodiment of the present disclosure. Referring to fig. 1, a geothermal heating system includes: a heat transfer tank 10 and a vacuum device 20. The heat transfer tank 10 has a hot water storage chamber 111, a geothermal water storage chamber 112, a hot water inlet 101, a hot water outlet 102, a geothermal water inlet 103, and a geothermal water outlet 104. The hot water storage cavity 111 is respectively communicated with the hot water inlet 101 and the hot water outlet 102, the geothermal water storage cavity 112 is respectively communicated with the geothermal water inlet 103 and the geothermal water outlet 104, and the tops of the hot water storage cavity 111 and the geothermal water storage cavity 112 are communicated. The vacuum device 20 is used for exhausting non-condensable gas in the heat transfer tank 10, maintaining the vacuum of the heat transfer tank 10 and evaporating geothermal water in the geothermal water storage cavity 112.

In the embodiment of the disclosure, geothermal water is input into the geothermal water storage cavity of the heat transfer tank through the geothermal water inlet, and hot water is input into the hot water storage cavity of the heat transfer tank through the hot water supply inlet. The hot water supply and the geothermal water are respectively arranged in the two storage cavities and cannot be in direct contact, and the geothermal water cannot pollute the quality of the hot water. The vacuum device removes non-condensable gas in the heat transfer tank, maintains vacuum in the heat transfer tank, reduces the boiling point of water in the heat transfer tank under the condition that the heat transfer tank is in vacuum, and evaporates water vapor from geothermal water in the geothermal water storage cavity due to higher temperature of the geothermal water. The geothermal water evaporates the steam that sends and constantly increases, and steam has mobility simultaneously, because the top that heat transfer jar is being close to in the geothermal water storage chamber and geothermal water storage chamber is intercommunication each other, steam can flow to the hot water storage chamber, and steam and the hot water supply in the hot water storage chamber intensive mixing carry out the mass transfer heat transfer, make the temperature rise of the hot water supply in the hot water storage chamber. The hot water with the increased temperature flows out through the hot water supply outlet and is used for supplying heat. The geothermal water with the reduced temperature flows out through the geothermal water outlet and is utilized at a next stage or flows to the ground again for heating. Because the hot water is contacted with the evaporated water vapor to realize heat transfer, the temperature of the hot water is increased. Meanwhile, the steam has high cleanliness relative to geothermal water, does not pollute the quality of the hot water, is not easy to generate scale, and does not influence the heat transfer effect.

In the disclosed embodiment, geothermal water transfers heat to the hot water, and the steam is mixed with the hot water, which is equivalent to increasing the quality of the hot water, and the process is called mass and heat transfer.

In the embodiment of the present disclosure, the vacuum device 20 may extract the non-condensable gas in the heat transfer tank 10, so that the pressure of the heat transfer tank 10 is lower than the atmospheric pressure, and the heat transfer tank 10 is under a certain vacuum degree. Because the boiling point of water and pressure are in positive correlation, under the condition of pressure reduction, the boiling point of water is reduced, the temperature of geothermal water is higher, the geothermal water can reach the boiling point first and continuously evaporate water vapor, and the temperature of hot water is lower than that of geothermal water, so that water vapor cannot be generated.

In the disclosed embodiment, the vacuum device 20 draws non-condensable gases from the heat transfer tank 10, which are not condensed into a liquid in the heat transfer tank 10.

As shown in fig. 1, the vacuum device 20 communicates with the top end of the heat transfer tank 10 through a pipe 100. In fig. 1, the pipe 100 is communicated with the hot water storage chamber 111, and the vacuum device 20 can also reduce the pressure in the geothermal water storage chamber 112 because the hot water storage chamber 111 is communicated with the top of the geothermal water storage chamber 112. In other implementations, the vacuum device 20 may be in communication with the geothermal water storage chamber 112 via a conduit 100.

In the disclosed embodiment, the vacuum device 20 is a vacuum pump. In other implementations, the vacuum device 20 may be other devices that can remove non-condensable gases from the heat transfer tank 10.

In the disclosed embodiment, the temperature of the geothermal water entering the heat transfer tank 10 from the geothermal water inlet 103 is between 70 degrees celsius (° c) and 80 degrees celsius, and the temperature of the heated water entering the heat transfer tank 10 from the heated water inlet 101 is between 30 degrees celsius and 40 degrees celsius.

Next, the heat transfer process will be described by taking an example in which the temperature of the geothermal water entering the heat transfer tank 10 from the geothermal water inlet 103 is 75 degrees celsius and the temperature of the heated water entering the heat transfer tank 10 from the heated water inlet 101 is 35 degrees celsius.

In the embodiment of the disclosure, the vacuum device 20 can extract the non-condensable gas in the heat transfer tank 10, so that the pressure in the heat transfer tank 10 reaches 0.114Bar (Bar), 75-degree-centigrade geothermal water evaporates 48-degree-centigrade steam under the pressure of 0.114Bar in the geothermal water storage cavity 112, the 48-degree-centigrade steam enters the hot water storage cavity 111 and performs mass and heat transfer with 35-degree-centigrade hot water in the hot water storage cavity 111, so that the temperature of the hot water in the hot water storage cavity 111 is increased to 45-degree-centigrade hot water, and the hot water is output through the hot water outlet 102 for supplying heat.

In the embodiment of the present disclosure, the temperature in the hot water storage chamber 111 is lower than the temperature in the geothermal water storage chamber 112, so the hot water storage chamber 111 may also be referred to as a low temperature side, and the geothermal water storage chamber 112 may also be referred to as a high temperature side.

In the disclosed embodiment, the pressure in the heat transfer tank 10 is such that geothermal water at a higher temperature can evaporate water vapor and hot water at a lower temperature will not evaporate water vapor. The pressure of the heat transfer tank 10 is between 0.1Bar and 0.38 Bar.

In the disclosed embodiment, since geothermal water is evaporated at low pressure, this manner of evaporation may be referred to as flash evaporation.

In the embodiment of the present disclosure, the non-condensable gas extracted by the vacuum device 20 is treated and then discharged into the air, so as to avoid environmental pollution.

As shown in fig. 1, the vacuum device 20 is communicated with a noncondensable gas outlet 105 at the top end of the heat transfer tank 10 through a pipe 100.

Fig. 2 is a schematic structural diagram of a geothermal heating system according to an embodiment of the disclosure. Referring to fig. 2, the geothermal heating system further includes: a valve 30 and a first water outlet pump 901. The first water outlet pump 901 is in communication with the hot water supply outlet 102. The open/close valve 30 has an input port, an output port, and a pressure signal input port, the pressure signal input port is communicated with an outlet of the first water outlet pump 901, the input port is used for inputting hot water, and the output port is communicated with the hot water supply inlet 101.

The first water outlet pump 901 extracts the hot water from the heat transfer tank 10 to supply the hot water. The opening and closing valve 30 can control the opening and closing of the valve through the sensed pressure. An output port of the open/close valve 30 communicates with the hot water supply inlet 101, and supplies hot water to the heat transfer tank 10. When the hot water is heated in the heat transfer tank 10, the heated water is discharged through the hot water outlet 102 to be heated. Since the pressure signal input port of the open/close valve 30 is communicated with the outlet of the first water outlet pump 901, that is, the open/close valve 30 can sense the pressure of the hot water discharged from the first water outlet pump 901. When the pressure sensed by the open/close valve 30 suddenly decreases, it is indicated that the hot water discharged through the first water discharge pump 901 is small, and the valve of the open/close valve 30 is closed to prevent the hot water from flowing into the heat transfer tank 10, thereby protecting the liquid level of the heat transfer tank 10 from overpressure.

In the embodiment of the present disclosure, the open/close valve 30 is arranged, and the open/close valve 30 is controlled by the pressure of the hot water discharged from the first water discharge pump 901. The hot water in the heat transfer tank 10 is prevented from being too much, so that the hot water is mixed with the geothermal water, and the heat transfer effect is prevented from being influenced. Meanwhile, the phenomenon that the first water outlet pump 901 is damaged due to the fact that the hot water in the heat transfer tank 10 is too little and the wires of the first water outlet pump 901 are protected and are pumped dry is avoided.

As shown in fig. 2, the hot water supply inlet 101, the hot water supply outlet 102, the geothermal water inlet 103, and the geothermal water outlet 104 are all communicated with the pipe 100, the open/close valve 30 is positioned on the pipe 100 communicated with the hot water supply inlet 101, and the first water outlet pump 901 is positioned on the pipe 100 communicated with the hot water supply outlet 102. The open-close valve 30 is communicated with the outlet of the first water outlet pump 901 through another section of pipeline 100.

Referring again to fig. 2, the heat transfer tank 10 includes a tank body 11, and the tank body 11 is used to provide a space for storing geothermal water and hot water. The heat transfer tank 10 also includes a first sprayer 12 and a second sprayer 13.

Wherein the first sprinkler 12 is located at an upper portion of the geothermal water storage chamber 112 and communicates with the geothermal water inlet 103. The second sprayer 13 is located at an upper portion of the hot water storage chamber 111 and communicates with the hot water inlet 101.

After entering the geothermal water inlet 103, geothermal water is supplied to the geothermal water storage cavity 112 through the first sprayer 12, and the evaporation area of the geothermal water can be increased by the first sprayer 12, so that the evaporation effect is improved.

After hot water enters the hot water inlet 101, the second sprayer 13 inputs the hot water into the hot water storage cavity 111, and the second sprayer 13 can increase the contact area between the hot water and the steam and increase the heat transfer effect.

Referring again to fig. 2, the heat transfer tank 10 has two hot water supply inlets 101. The two hot water supply inlets 101 are different in height in the vertical direction. The heat transfer tank 10 includes two second sprayers 13, and the two second sprayers 13 are respectively communicated with the two hot water supply inlets 101.

Hot water enters from the two hot water inlet ports 101 and respectively enters the hot water storage cavity 111 from the two second sprayers 13, the two second sprayers 13 are located at different heights, the hot water sprayed out of the second sprayers 13 above contacts with a mixture of water vapor and non-condensable gas on the top of the heat transfer tank, the concentration of the non-condensable gas is improved, the non-condensable gas is conveniently discharged, and the loss of the water vapor is reduced.

In the embodiment of the present disclosure, the hot water sprayed from the second sprayer 13 located below is sufficiently contacted with the water vapor in the hot water storage chamber 111, so as to perform mass and heat transfer and increase the temperature of the hot water.

In the disclosed embodiment, the first and

second sprayers

12 and 13 may be pipes having a plurality of through holes, and the liquid in the first and

second sprayers

12 and 13 flows to the through holes and flows out of the through holes. Wherein the first sprinkler 12 communicates with the pipe 100 at the geothermal water inlet 103 and the second sprinkler 13 communicates with the pipe 100 at the hot water inlet 101.

As shown in fig. 2, the vacuum apparatus 20 further includes a gas tank 201, and the gas tank 201 is located on the pipe 100 connecting the vacuum apparatus 20 and the noncondensable gas outlet 105. The gas tank 201 may maintain the pressure in the heat transfer tank 10, and when the pressure in the heat transfer tank 10 is lower than a set value, the non-condensable gas in the gas tank 201 may enter the heat transfer tank 10 to maintain the pressure in the heat transfer tank 10.

Referring again to fig. 2, the geothermal heating system further comprises: a waste line 120 and two waste valves 130.

The drain line 120 is communicated with the lower ends of the hot water storage chamber 111 and the geothermal water storage chamber 112, respectively. Two waste valves 130 are respectively provided on the waste pipe 120 communicating with the hot water storage chamber 111 and the waste pipe 120 communicating with the geothermal water storage chamber 112.

During the mass and heat transfer, dirt may be deposited in the hot water storage chamber 111 and the geothermal water storage chamber 112, and the blowdown pipe 120 is arranged to open the blowdown valve 130 to drain dirt in the hot water storage chamber 111 and the geothermal water storage chamber 112 when blowdown is required. When the heat is transferred normally, the blowoff valve 130 is closed, so that the leakage of geothermal water and hot water is avoided, and the resource waste is caused.

As shown in fig. 2, the sewerage pipeline 120 is communicated with the first sewerage outlet 106 at the bottom end of the hot water storage chamber 111, and the sewerage pipeline 120 is also communicated with the second sewerage outlet 107 at the bottom end of the geothermal water storage chamber 112.

The geothermal heating system provided by the embodiment of the disclosure comprises two input ports, namely a geothermal water inlet 103 and a hot water supply inlet 101; four outlets, namely a geothermal water outlet 104, a hot water outlet 102,

blowdown outlets

106 and 107, and a non-condensable gas outlet 105.

Referring again to fig. 2, the heat transfer tank 10 further includes: a partition 14. A partition 14 is provided in the tank 11, and the partition 14 divides the inner cavity of the tank 11 into a hot water storage chamber 111 and a geothermal water storage chamber 112.

Fig. 3 is a schematic structural diagram of a separator according to an embodiment of the present disclosure. Referring to fig. 3, the top of the separator 14 has a plurality of channels 141.

Geothermal water is generally high-salinity geothermal brine, and if the geothermal water is directly contacted with hot water, the quality of the hot water can be polluted, and a conveying pipeline is scaled, blocked or corroded to perforate. The inner cavity of the tank body 11 of the partition plate 14 is divided into a hot water storage cavity 111 and a geothermal water storage cavity 112, so that the geothermal water is prevented from directly contacting with the hot water, and the quality of the hot water is prevented from being polluted.

In the embodiment of the present disclosure, the channel 141 is a curved channel, droplets of geothermal water in the geothermal water storage chamber 112 may be carried in the water vapor, and the water vapor containing the droplets of geothermal water flows in the curved channel, so that the droplets of geothermal water in the water vapor can contact with the sidewall of the channel, thereby blocking the droplets of geothermal water from entering the hot water storage chamber 111 and avoiding affecting the quality of the hot water.

In the disclosed embodiment, the heat transfer tank 10 is an arched cylinder, and the partition 14 is arched to facilitate connection with the inner sidewall of the heat transfer tank.

In the implementation of the present disclosure, the partition 14 may be a stainless steel partition, a titanium partition or an alloy partition, so as to ensure the corrosion resistance of the partition 14, and avoid the corrosion of the partition 14, so that the geothermal water and the hot water are mixed to affect the quality of the hot water.

In the embodiment of the present disclosure, scale is deposited on the partition 14 during the heat transfer process, but since the geothermal heating system provided by the present disclosure mainly transfers heat through water vapor, the heat transfer of the partition 14 only occupies a small part of the geothermal heating system, and even if scale is deposited on the partition 14, the heat transfer effect of the geothermal heating system is not affected.

In the disclosed embodiment, the tank 11 may be a stainless steel tank, a titanium tank, or an alloy tank, which ensures corrosion resistance of the tank 11.

Referring again to fig. 2, the geothermal heating system further comprises: a first flow control valve 401 and a first level gauge 501. One end of the first flow rate control valve 401 communicates with the hot water supply inlet 101, and the other end of the first flow rate control valve 401 communicates with the geothermal water outlet 104. The first liquid level meter 501 is located in the hot water storage chamber 111. The first liquid level meter 501 is used to measure the level of the hot water in the hot water storage chamber 111. The hot water supply inlet 101 and the geothermal water outlet 104 are communicated through a pipe 100, and the first flow control valve 401 is located on the pipe 100 communicating the hot water supply inlet 101 and the geothermal water outlet 104.

Fig. 4 is a block diagram of a geothermal heating system provided in an embodiment of the present disclosure. Referring to fig. 4, the geothermal heating system further includes a controller 60. The controller 60 is electrically connected to the first liquid level meter 501 and the first flow control valve 401, respectively. The controller 60 is configured to control the valve opening degree of the first flow control valve 401 to increase when the liquid level measured by the first liquid level meter 501 is higher than a first liquid level, and to control the valve opening degree of the first flow control valve 401 to decrease when the liquid level measured by the first liquid level meter 501 is lower than a second liquid level, the first liquid level being higher than the second liquid level.

If the amount of the hot water stored in the hot water storage cavity 111 is large and cannot be discharged in time, the hot water in the hot water storage cavity 111 flows to the geothermal water storage cavity 112, the temperature of the geothermal water in the geothermal water storage cavity 112 is reduced, and the heat transfer effect is influenced. The hot water supply inlet 101 is connected to the geothermal water outlet 104, that is, supplies hot water to the geothermal water outlet 104, and when the amount of hot water supplied to the hot water storage chamber 111 is excessive, supplies hot water to the geothermal water outlet 104. The first flow rate control valve 401 is used to control the amount of the hot water supplied to the geothermal water outlet 104. The level of the heated water in the heated water storage chamber 111 is monitored in real time by the first level meter 501 and is transmitted to the controller 60 as an electrical signal.

When the level of the hot water exceeds the first level, which indicates that there is a large amount of hot water stored in the hot water storage chamber 111, the controller 60 controls the valve opening of the first flow rate control valve 401 to increase, and outputs the hot water to the geothermal water outlet 104, thereby reducing the amount of hot water flowing into the hot water storage chamber 111. The excessive hot water in the hot water storage cavity 111 is prevented from flowing to the geothermal water storage cavity 112, the temperature of the geothermal water in the geothermal water storage cavity 112 is reduced, and the heat transfer effect is not influenced. When the level of the hot water is lower than the second level, which indicates that the hot water is less stored in the hot water storage chamber 111, the controller 60 controls the valve opening of the first flow rate control valve 401 to decrease, and decreases the hot water to be output to the geothermal water outlet 104, thereby increasing the hot water flowing into the hot water storage chamber 111. The influence of too little hot water supply of the hot water storage cavity 111 on the heat supply is avoided.

Referring again to fig. 2, the geothermal heating system further comprises: a second flow control valve 402 and a third flow control valve 403. The second flow rate control valve 402 communicates with the hot water supply inlet 101, and the third flow rate control valve 403 communicates with the hot water supply outlet 102.

Referring again to fig. 4, the controller 60 is electrically connected to the second flow control valve 402 and the third flow control valve 403, respectively, and the controller 60 is configured to control the second flow control valve 402 to close when the liquid level measured by the first liquid level meter 501 is higher than a third liquid level, and to control the third flow control valve 403 to close when the liquid level measured by the first liquid level meter 501 is lower than a fourth liquid level, the third liquid level being higher than the first liquid level, the second liquid level being higher than the fourth liquid level.

The second flow control valve 402 is used to control the flow rate of the hot water supplied into the hot water storage chamber 111, and the third flow control valve 403 is used to control the flow rate of the hot water supplied out of the hot water storage chamber 111. When the liquid level measured by the first liquid level meter 501 is higher than the third liquid level, which indicates that the hot water in the hot water storage chamber 111 exceeds the high alarm liquid level, the controller 60 closes the second flow control valve 402, so that hot water is not delivered to the hot water storage chamber 111 any more, the hot water in the hot water storage chamber 111 is prevented from flowing to the geothermal water storage chamber 112 too much, the temperature of geothermal water in the geothermal water storage chamber 112 is reduced, and the heat transfer effect is influenced. When the liquid level measured by the first liquid level meter 501 is lower than the fourth liquid level, which indicates that the hot water supply in the hot water storage chamber 111 is lower than the low alarm liquid level, the controller 60 closes the third flow control valve 403, so that the hot water is not output any more, and the hot water in the hot water storage chamber 111 is prevented from flowing dry.

As shown in fig. 2, the first water discharge pump 901 is located between the third flow rate control valve 403 and the hot water supply outlet 102.

In an embodiment of the disclosure, the third level is higher than the first level, the first level is higher than the second level, and the second level is higher than the fourth level. Wherein the third level may be referred to as a high level, the first level may be referred to as a high level, the second level may be referred to as a low level, and the fourth level may be referred to as a low level.

In the disclosed embodiment, geothermal water inlet 103 communicates with geothermal water outlet 104. The output geothermal water can be recovered and heated again by geothermal heat, and then enters the heat transfer tank 10 from the geothermal water inlet 103. Geothermal water with high temperature flows to the geothermal water storage cavity 112 from the geothermal water inlet 103, after evaporation steam of the geothermal water transfers heat with the hot water in the hot water storage cavity 111, the geothermal water with reduced temperature is discharged from the geothermal water outlet 104, and flows to the geothermal water storage cavity 112 from the geothermal water inlet 103 after being heated by geothermal heat, so that heat transfer is realized, the circular flow is realized, and geothermal water resources are saved. Since the geothermal water in the geothermal water storage chamber 112 evaporates the outlet steam to the hot water storage chamber 111, the total content of geothermal water is reduced. If the total content of geothermal water is too low, the heat transfer effect is affected.

In the embodiment of the disclosure, the hot water with lower temperature is used as the flowing geothermal water, and the geothermal water with higher temperature is changed after being heated, so that heat transfer is realized, the sufficient amount of geothermal water is ensured, and the heat transfer can be realized through circulating flow.

Referring again to fig. 2, the geothermal heating system further comprises: a second fluid level gauge 502 and a fourth flow control valve 404. A second liquid level gauge 502 is located in the geothermal water storage chamber 112, the second liquid level gauge 502 is used for measuring the liquid level of geothermal water in the geothermal water storage chamber 112, and the fourth flow control valve 404 is communicated with the geothermal water outlet 104. A fourth flow control valve 404 is located on the pipe 100 in communication with the geothermal water outlet 104.

Referring again to fig. 4, the controller 60 is electrically connected to the second liquid level meter 502 and the fourth flow control valve 404, respectively, and the controller 60 is configured to control the valve opening of the fourth flow control valve 404 to increase when the liquid level measured by the second liquid level meter 502 is higher than a fifth liquid level, and to control the valve opening of the fourth flow control valve 404 to decrease when the liquid level measured by the second liquid level meter 502 is lower than a sixth liquid level, the fifth liquid level being higher than the sixth liquid level.

The second liquid level gauge 502 is arranged to detect the level of geothermal water in the geothermal water storage chamber 112 in real time and to transmit the level of geothermal water to the controller 60 in the form of an electrical signal. When the liquid level measured by the second liquid level meter 502 is higher than the fifth liquid level, the amount of geothermal water in the geothermal water storage chamber 112 is illustrated to be larger. At this time, the controller 60 controls the valve opening of the fourth flow control valve 404 to increase, so that more hot water is discharged through the geothermal water outlet 104, and the phenomenon that the quality of the hot water is affected because excessive geothermal water flows to the geothermal water storage chamber 111 in the geothermal water storage chamber 112 is avoided. When the liquid level measured by the second liquid level meter 502 is lower than the sixth liquid level, it is explained that the amount of geothermal water in the geothermal water storage chamber 112 is small. At this time, the controller 60 controls the valve opening of the fourth flow control valve 404 to decrease, so that the geothermal water discharged from the geothermal water outlet 104 is decreased, and the influence of too little geothermal water in the geothermal water storage cavity 112 on the heating effect is avoided.

Referring again to fig. 2, the geothermal heating system further comprises: a fifth flow control valve 405, the fifth flow control valve 405 being in communication with the geothermal water inlet 103. Wherein a fifth flow control valve 405 is located on the pipe 100 in communication with the geothermal water inlet 103, the fifth flow control valve 405 being for controlling the flow of geothermal water into the geothermal water storage chamber 112.

Referring again to fig. 4, the fifth flow control valve 405 is electrically connected to the controller 60.

The controller 60 is configured to control the fifth flow control valve 405 to close when the liquid level measured by the second liquid level meter 502 is higher than the seventh liquid level, and to control the fourth flow control valve 404 to close when the liquid level measured by the second liquid level meter 502 is lower than the eighth liquid level, the seventh liquid level being higher than the fifth liquid level, the sixth liquid level being higher than the eighth liquid level.

The controller 60 may control the opening and closing of the fourth flow control valve 404 and the fifth flow control valve 405 according to the liquid level measured by the second liquid level meter 502. For example, when the liquid level measured by the second liquid level meter 502 is higher than the seventh liquid level, which indicates that the geothermal water in the geothermal water storage chamber 112 has exceeded the high-alarm level, the controller 60 closes the fifth flow control valve 405, so that no geothermal water flows into the geothermal water storage chamber 112, and the geothermal water is prevented from entering the hot water storage chamber 111 and polluting the quality of the heated water in the hot water storage chamber 111. When the liquid level measured by the second liquid level meter 502 is lower than the eighth liquid level, which indicates that the hot water in the geothermal water storage cavity 112 is lower than the low-alarm liquid level, the controller 60 closes the fourth flow control valve 404, so that the geothermal water does not flow out any more, the geothermal water storage volume of the geothermal water storage cavity 112 is ensured, the geothermal water can evaporate enough water vapor, and the heat transfer effect is ensured.

In an embodiment of the disclosure, the seventh liquid level is higher than the fifth liquid level, the fifth liquid level is higher than the sixth liquid level, and the sixth liquid level is higher than the eighth liquid level. Wherein the seventh level may be referred to as a high level, the fifth level may be referred to as a high level, the sixth level may be referred to as a low level, and the eighth level may be referred to as a low level.

In embodiments of the present disclosure, the seventh level may be equal to the third level, the fifth level may be equal to the first level, the sixth level may be equal to the second level, and the eighth level may be equal to the fourth level.

In the disclosed embodiment, the geothermal heating system may be provided with an alarm, which is electrically connected to the controller 60. When the liquid level measured by the first liquid level meter 501 is higher than the third liquid level, the liquid level measured by the first liquid level meter 501 is lower than the fourth liquid level, the liquid level measured by the second liquid level meter 502 is higher than the seventh liquid level or the liquid level measured by the second liquid level meter 502 is lower than the eighth liquid level, the controller 60 controls the alarm to alarm, and the controller reminds workers to control the geothermal heat supply system to be closed.

Referring again to fig. 4, the first water outlet pump 901 is electrically connected to the controller 60.

The controller 60 may control the power of the first water pump 901 according to the liquid level measured by the first liquid level meter 501. For example: when the liquid level measured by the first liquid level meter 501 is higher than the first liquid level, it indicates that there is more hot water in the hot water storage cavity 111, the controller 60 increases the power of the first water outlet pump 901, increases the water outlet amount of the hot water, and prevents the hot water from entering the geothermal water storage cavity 112, and when the liquid level measured by the first liquid level meter 501 is lower than the second liquid level, it indicates that there is less hot water in the hot water storage cavity 111, the controller 60 decreases the power of the first water outlet pump 901, decreases the water outlet amount of the hot water, and prevents the hot water storage amount from being too small, which causes cavitation of the first water outlet pump 901 and damages the first water outlet pump 901.

In the embodiment of the present disclosure, when the liquid level measured by the first liquid level meter 501 is higher than the third liquid level, or when the liquid level measured by the first liquid level meter 501 is lower than the fourth liquid level, the controller 60 further controls the first water outlet pump 901 to be turned off.

Referring again to fig. 2, the geothermal heating system further comprises: the second water outlet pump 902, the second water outlet pump 902 and the geothermal water outlet 104, the second water outlet pump 902 is located on the pipeline 100 communicated with the geothermal water outlet 104, and the second water outlet pump 902 can output geothermal water in the geothermal water storage cavity 112.

Referring again to fig. 4, the second effluent pump 902 is electrically connected to the controller 60.

The controller 60 may control the power of the second effluent pump 902 based on the level of the liquid measured by the second liquid level meter 502. For example, when the liquid level measured by the second liquid level meter 502 is higher than the fourth liquid level, it indicates that there is more geothermal water in the geothermal water storage cavity 112, and the controller 60 increases the power of the second water outlet pump 902 to increase the water outlet amount of the geothermal water, so as to prevent the geothermal water from entering the hot water storage cavity 111 and polluting the quality of the hot water in the hot water storage cavity 111. When the liquid level measured by the second liquid level meter 502 is lower than the third liquid level, it indicates that the hot water in the geothermal water storage cavity 112 is less in hot water supply, the controller 60 adjusts the power of the second water outlet pump 902 to reduce the water outlet amount of the geothermal water, so as to avoid that the second water outlet pump 902 is dry pumped and the second water outlet pump 902 is damaged due to too small geothermal water storage amount.

In the disclosed embodiment, the controller 60 also controls the second effluent pump 902 to turn off when the liquid level measured by the second liquid level meter 502 is higher than the seventh liquid level, or when the liquid level measured by the second liquid level meter 502 is lower than the eighth liquid level.

As shown in fig. 2, the second water outlet pump 902 is located between the fourth flow control valve 404 and the geothermal water outlet 104.

Referring again to fig. 2, the geothermal heating system further comprises: a pressure transmitter 80. The pressure transmitter 80 is in communication with the heat transfer tank 10.

Referring again to fig. 4, the controller 60 is electrically connected to the pressure transducer 80, the controller 60 being configured to control the power of the vacuum device 20 to be reduced when the pressure measured by the pressure transducer 80 is lower than the first pressure. When the pressure measured by the pressure transducer 80 is higher than the second pressure, the power of the vacuum device 20 is controlled to increase. The second pressure is greater than the first pressure.

The vacuum device 20 is used for controlling the vacuum degree in the heat transfer tank 10, so that geothermal water can evaporate water vapor, and hot water supply cannot evaporate water vapor. When the pressure measured by the pressure transmitter 80 is lower than the first pressure, which indicates that the pressure in the heat transfer tank 10 is too low, the hot water will evaporate water vapor, and at this time, the controller 60 controls the power of the vacuum device 20 to decrease, so that the pressure in the heat transfer tank 10 increases, and the boiling point of the hot water cannot be evaporated. When the pressure measured by the pressure transmitter 80 is higher than the second pressure, which indicates that the pressure in the heat transfer tank 10 is too high, the geothermal water cannot evaporate water vapor, and at this time, the controller 60 controls the power of the vacuum device 20 to increase, so that the pressure in the heat transfer tank 10 decreases, and the boiling point of the geothermal water decreases, so that the geothermal water vapor can evaporate.

As shown in fig. 1 and 2, a pressure transmitter 80 communicates with the top end of the heat transfer tank 10.

In fig. 2, the pipe 100 connecting the hot water inlet 101 and the geothermal water outlet 104 is shown disconnected for clarity of other devices, and in practice, the pipe 100 is not disconnected.

Similarly, the conduit 100 connecting the on-off valve 30 and the outlet of the first water pump 901 is also connected and not disconnected.

In the embodiment of the present disclosure, the pipe 100 may be a rigid pipe or a hose, which is not limited by the present disclosure.

Referring again to fig. 2, the geothermal heating system further comprises: and an on-off valve 110, the on-off valve 110 being located on the pipe 100 communicating the vacuum device 20 and the heat transfer tank 10. Under the condition that vacuum apparatus 20 damages or needs the inspection, can close ooff valve 110, then overhaul or change vacuum apparatus 20, avoid heat transfer jar 10 and air intercommunication, cause the increase of pressure in the heat transfer jar 10, make geothermal water's temperature rise, unable evaporation goes out steam, influences heat transfer effect.

In the embodiment of the present disclosure, the first flow control valve 401, the second flow control valve 402, the third flow control valve 403, the fourth flow control valve 404, and the fifth flow control valve 405 are all electrically controlled valves, which ensure that the first flow control valve 401, the second flow control valve 402, the third flow control valve 403, the fourth flow control valve 404, and the fifth flow control valve 405 can transmit electrical signals to the controller 60.

In the embodiment of the present disclosure, the first liquid level meter 501 and the second liquid level meter 502 are both electric liquid level meters, which ensure that the first liquid level meter 501 and the second liquid level meter 502 can transmit electric signals to the controller 60.

In another implementation manner of the embodiment of the present disclosure, the valve opening states of the first flow control valve 401, the second flow control valve 402, the third flow control valve 403, the fourth flow control valve 404, and the fifth flow control valve 405 may also be manually adjusted.

In the embodiment of the present disclosure, the Controller 60 is a Programmable Logic Controller (PLC).

In the embodiment of the disclosure, a start button can be arranged to control the opening and closing of the geothermal heating system, so that the functions of one-key starting and automatic load regulation are realized.

Referring again to fig. 2, the geothermal heating system further comprises: a temperature transmitter 70. The temperature transmitter 70 is in communication with the hot water supply outlet 102, and the temperature transmitter 70 is configured to measure a temperature of the hot water supplied from the hot water supply outlet 102.

Referring again to fig. 4, the controller 60 is electrically connected to the temperature transmitter 70, and the controller 60 is configured to control the valve opening degree of the fifth flow control valve 405 to increase when the temperature measured by the temperature transmitter 70 is lower than the first temperature.

A temperature transducer 70 is arranged to measure the temperature of the outgoing heated water and transmit the temperature of the heated water in the form of an electrical signal to the controller 60 in real time. When the temperature measured by the temperature transmitter 70 is lower than the first temperature, it indicates that the heat transfer effect is not good and the geothermal water in the geothermal water storage chamber 112 evaporates less water vapor. The controller 60 controls the valve opening of the fifth flow control valve 405 to increase, so that the amount of geothermal water in the geothermal water storage cavity 112 is increased, more water vapor can be evaporated from the geothermal water in the geothermal water storage cavity 112, and the heat transfer effect is improved.

In the embodiment of the present disclosure, when the ambient temperature decreases, the hot water discharged from the hot water outlet 102 transfers heat with the air, so that the temperature of the hot water discharged from the hot water outlet 102 decreases, the temperature measured by the temperature transmitter 70 is also lower, and the controller 60 controls the valve opening of the fifth flow control valve 405 to increase, so as to increase the amount of geothermal water in the geothermal water storage cavity 112, so that the geothermal water in the geothermal water storage cavity 112 can evaporate more water vapor, thereby improving the heat transfer effect, and increasing the temperature of the hot water discharged from the hot water outlet 102.

In the embodiment of the present disclosure, after the start button is pressed, the geothermal heating system starts to operate, the vacuum device 20 is first started, and after the pressure transmitter 80 detects that the pressure reaches the set value, the controller 60 controls the second flow control valve 402 and the third flow control valve 403 to be opened, and starts the first water outlet pump 901 to circulate the hot water first, and then starts the fifth flow control valve 405, the fourth flow control valve 404 and the second water outlet pump 902, so that the geothermal water starts to be output, and the evaporated water vapor realizes heat transfer.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A geothermal heating system, comprising:

the heat transfer tank (10) is provided with a hot water storage cavity (111), a geothermal water storage cavity (112), a hot water inlet (101), a hot water outlet (102), a geothermal water inlet (103) and a geothermal water outlet (104), the hot water storage cavity (111) is respectively communicated with the hot water inlet (101) and the hot water outlet (102), the geothermal water storage cavity (112) is respectively communicated with the geothermal water inlet (103) and the geothermal water outlet (104), and the top of the hot water storage cavity (111) is communicated with the top of the geothermal water storage cavity (112);

the vacuum device (20) is used for exhausting non-condensable gas in the heat transfer tank (10), maintaining the vacuum of the heat transfer tank (10) and evaporating geothermal water in the geothermal water storage cavity (112).

2. A geothermal heating system according to claim 1, wherein the heat transfer tank (10) comprises:

a tank (11), the hot water supply inlet (101) and the geothermal water inlet (103) being located at an upper portion of the tank (11);

a first sprayer (12) and a second sprayer (13) located in the tank (11), the first sprayer (12) being located at an upper portion of the geothermal water storage chamber (112) and communicating with the geothermal water inlet (103), the second sprayer (13) being located at an upper portion of the hot water storage chamber (111) and communicating with the hot water inlet (101).

3. A geothermal heating system according to claim 2, wherein the heat transfer tank (10) has two of the hot water supply inlets (101);

the heat transfer tank (10) comprises two of said second sprinklers (13), the two second sprinklers (13) being in communication with the two hot water inlets (101) respectively and the two second sprinklers (13) being located at different heights.

4. A geothermal heating system according to claim 2, wherein the heat transfer tank (10) further comprises:

the separator (14) is positioned in the tank body (11), the inner cavity of the tank body (11) is divided into the hot water storage cavity (111) and the geothermal water storage cavity (112) by the separator (14), the top of the separator (14) is connected with the top of the tank body, and the top of the separator (14) is provided with a plurality of channels (141).

5. A geothermal heating system according to any one of claims 1 to 4, further comprising:

a first water outlet pump (901) which is communicated with the hot water supply outlet (102);

the opening and closing valve (30) is provided with an input port, an output port and a pressure signal input port, the pressure signal input port is communicated with an outlet of the first water outlet pump (901), the input port is used for inputting hot water, and the output port is communicated with the hot water supply inlet (101).

6. A geothermal heating system according to any one of claims 1 to 4, further comprising:

a first flow control valve (401) having one end communicating with the hot water supply inlet (101) and the other end communicating with the geothermal water outlet (104);

a first level gauge (501) located in the hot water storage chamber (111);

a controller (60) electrically connected to the first liquid level meter (501) and the first flow control valve (401), respectively, the controller (60) being configured to control the valve opening of the first flow control valve (401) to increase when the liquid level measured by the first liquid level meter (501) is higher than a first liquid level, and to control the valve opening of the first flow control valve (401) to decrease when the liquid level measured by the first liquid level meter (501) is lower than a second liquid level, the first liquid level being higher than the second liquid level.

7. A geothermal heating system according to claim 6, further comprising:

a second flow control valve (402) in communication with the hot water supply inlet (101);

a third flow rate control valve (403) in communication with the hot water supply outlet (102);

wherein the controller (60) is electrically connected with the second flow control valve (402) and the third flow control valve (403), respectively, and the controller (60) is configured to control the second flow control valve (402) to close when the liquid level measured by the first liquid level meter (501) is higher than a third liquid level, and to control the third flow control valve (403) to close when the liquid level measured by the first liquid level meter (501) is lower than a fourth liquid level, the third liquid level being higher than the first liquid level, and the second liquid level being higher than the fourth liquid level.

8. A geothermal heating system according to claim 6, further comprising:

a fourth flow control valve (404) in communication with the geothermal water outlet (104);

a second liquid level gauge (502) located in the geothermal water storage chamber (112);

wherein the controller (60) is electrically connected to the second liquid level meter (502) and the fourth flow control valve (404), respectively, and the controller (60) is configured to control the valve opening of the fourth flow control valve (404) to increase when the liquid level measured by the second liquid level meter (502) is higher than a fifth liquid level, and to control the valve opening of the fourth flow control valve (404) to decrease when the liquid level measured by the second liquid level meter (502) is lower than a sixth liquid level, the fifth liquid level being higher than the sixth liquid level.

9. A geothermal heating system according to claim 8, further comprising:

a fifth flow control valve (405) in communication with the geothermal water inlet (103);

wherein the controller (60) is electrically connected to the fifth flow control valve (405), the controller (60) being configured to control the fifth flow control valve (405) to close when the liquid level measured by the second liquid level meter (502) is above a seventh liquid level, and to control the fourth flow control valve (404) to close when the liquid level measured by the second liquid level meter (502) is below an eighth liquid level, the seventh liquid level being above the fifth liquid level, the sixth liquid level being above the eighth liquid level.

10. A geothermal heating system according to claim 9, further comprising:

a temperature transmitter (70) in communication with the hot water outlet (102);

wherein the controller (60) is electrically connected with the temperature transmitter (70), the controller (60) being configured to control the valve opening of the fifth flow control valve (405) to increase when the temperature measured by the temperature transmitter (70) is lower than a first temperature.