CN111928319A - Full-cylinder type heat storage and heat exchange integrated well - Google Patents

Abstract

The invention discloses a full-cylinder type heat storage and exchange integrated well which comprises a well pipe, a sieve plate, a solid heat storage material and a heat insulation material, wherein the well pipe, the sieve plate, the solid heat storage material and the heat insulation material are arranged in a rock-soil body. The heat supply system formed by the full-cylinder type heat storage and heat exchange integrated well comprises a circulating water pump, a heat pump host, a plate type heat exchanger, a solar heat collector, a fan coil, floor heating, heating radiators and a control system besides the full-cylinder type heat storage and heat exchange integrated well. The invention can organically combine the heat storage technology, the heat exchange technology and the heating law, fully play the potential of the geothermal well, play the roles of peak clipping and valley filling, and improve the energy efficiency of the heat storage and heat exchange integrated well, thereby playing the roles of saving initial investment and reducing the use cost of users.

Description

A full-tube heat storage and heat exchange integrated well

technical field

The invention relates to an integrated well, in particular to a heat storage and heat exchange integrated well.

Background technique

In the middle and deep geothermal heating project, there are mainly two technologies. Directly use geothermal water for heating in areas rich in geothermal water resources; use heat exchange technology without water in areas where geothermal water resources are not abundant or lacking in geothermal water resources. The heat exchange technology without water adopts the method of casing heat exchange, the outer tube wall is used for heat exchange, the annular space between the inner and outer tubes is used to transport the fluid to be heated, and the inner tube is used to transport the heated fluid. The whole process is a relatively stable heat exchange process. When heat exchange technology without water is used for heating of civil buildings, the heating demand of civil buildings often changes with the change of outdoor temperature. At the beginning and end, the outdoor temperature is high, and the heat demand is relatively small; in the severe cold period, the outdoor temperature is low, and the heat demand is relatively large. Therefore, there is a situation in which the energy supply of the heat exchange well without taking water does not match the heating demand of civil buildings. In order to ensure a comfortable heating effect, it is often necessary to deploy enough heat exchange wells without water intake, which makes the investment too high and the benefit poor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings of the prior art, and to provide a full-tube heat storage and heat exchange integrated well that plays the role of filling valleys and cutting peaks.

A full-tube heat storage and heat exchange integrated well of the present invention comprises:

The well pipe is arranged in the rock and soil body, the upper part of the well pipe is located in the normal temperature stratum and the lower part is located in the temperature-increasing stratum, a partition plate is arranged in the vertical direction in the middle position of the well pipe, and the partition plate is arranged in the vertical direction. The bottom of the plate is fixedly connected with the top wall of the lower sieve plate, and the baffle plate divides the cavity of the well tube located above the lower sieve plate into a left chamber and a right chamber that are independent of each other, wherein the top of the left chamber serves as a The inlet of the well pipe, the top of the right chamber is used as the outlet of the well pipe; the inner wall of the left chamber and the inner wall of the right chamber located above the normal temperature stratum are respectively covered with thermal insulation layers, and the left chamber and The upper part of the right chamber is respectively fixed with an upper sieve plate along the horizontal direction, the upper sieve plate is fixedly connected with the inner wall of the well pipe and the partition plate, and the upper sieve plate, the lower sieve plate, the partition plate and the well pipe are surrounded by The left chamber and the right chamber are respectively filled with solid heat storage material, and a plurality of heat exchange channels are opened in the vertical direction in the solid heat storage material, and the top inlet of each heat exchange channel is connected to the upper The sieve holes on the sieve plate are communicated and the bottom outlet of each of the heat exchange channels is communicated with the sieve holes on the lower sieve plate, and a plurality of heat storage temperature sensors are installed on the solid heat storage material at upper and lower intervals to measure the solid heat storage. the temperature of the material;

The heat pump host, the inlet of the evaporator of the heat pump host is connected with the outlet of the well pipe through the first heating pipeline installed with the first valve, and the outlet of the condenser of the heat pump host is respectively connected with the user through the second heating pipeline The water inlet of the equipment is connected, the water outlet of the user equipment is connected with the condenser inlet of the heat pump host through the first return water pipeline installed with the second water pump, and the evaporator outlet of the heat pump host is installed with the first water pump, The second return water pipeline of the second valve is communicated with the inlet of the well pipe;

A plate heat exchanger, the inlet of the first fluid pipeline of the plate heat exchanger is communicated with the outlet of the first header pipe, and the inlet of the first header pipe is communicated with the outlet of the well pipe through the first branch pipe installed with the fourth valve And the second branch pipe installed with the sixth valve is connected to the first return water pipeline between the second water pump and the condenser inlet of the heat pump main engine; the outlet of the first fluid pipeline of the plate heat exchanger is connected to the first return water pipeline. The inlets of the two main pipes are communicated with the inlet of the well pipe, and the outlet of the second main pipe is communicated with the inlet of the well pipe through the third branch pipe installed with the third valve and the fourth water pump, and is connected with the second heat supply through the fourth branch pipe installed with the fifth valve The pipelines are connected, and the outlet of the second fluid pipeline of the plate heat exchanger is sequentially connected to the solar collector, the third water pump and the inlet of the second fluid pipeline of the plate heat exchanger through the circulation pipeline. A collector temperature sensor is installed on the solar collector;

The controller is connected with a plurality of thermal storage temperature sensors, a collector temperature sensor, a third water pump and a fourth water pump through a control line.

The beneficial effects of the present invention are:

The invention can organically combine the heat storage technology, the heat exchange technology and the heating rules, give full play to the potential of the geothermal well, play the role of cutting peaks and filling valleys, and improve the energy efficiency of the integrated heat storage and heat exchange well, thereby saving energy The role of initial investment and reduction of the user's cost of use.

Description of drawings

FIG. 1 is a schematic structural diagram of a full-tube heat storage and heat exchange integrated well according to the present invention.

FIG. 2 is a sectional view of the integrated well shown in FIG. 1 along the h-h direction.

FIG. 3 is a schematic diagram of the system installation of a full-tube heat storage and heat exchange integrated well according to the invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and through specific embodiments:

As shown in the accompanying drawings, a full-tube heat storage and heat exchange integrated well of the present invention includes:

The well pipe 2 arranged in the rock and soil body 1, the upper part of the well pipe 2 is located in the normal temperature stratum, and the lower part is located in the temperature-increasing stratum. The warm formation is also the heat extraction section of the integrated heat storage and heat exchange well. The normal temperature stratum is usually located at 0-30 meters underground, which can be divided into variable temperature zone (0-20 meters) and constant temperature zone (20-30 meters). About 3 degrees Celsius, the geothermal anomaly area can be increased by 4 to 10 degrees Celsius, and the normal temperature stratum and the warmed stratum can be measured by the formation temperature measurement method. The thermal insulation layer 3 can be made of polyurethane foam. A lower screen plate is fixed along the horizontal direction at the lower part of the inside of the well pipe 2 located under the normal temperature formation, and a partition plate is arranged in the vertical direction at the middle position of the well pipe 2. The partition plate The bottom is fixedly connected with the top wall of the lower sieve plate, and the partition plate divides the cavity of the well tube 2 above the lower sieve plate into a left chamber and a right chamber that are independent of each other, wherein the top of the left chamber serves as a The inlet a of the well tube 2, the top of the right chamber serves as the outlet b of the well tube 2.

Insulation layers 3 are respectively covered on the inner wall of the left chamber and the inner wall of the right chamber above the normal temperature stratum, and upper sieve plates are fixed in the horizontal direction on the upper parts of the left chamber and the right chamber located below the normal temperature stratum, respectively. The upper sieve plate is fixedly connected with the inner wall of the well pipe and the partition plate, and the left chamber and the right chamber enclosed by the upper sieve plate, the lower sieve plate, the partition plate and the well pipe 2 are respectively filled with solid heat storage materials. 4. A plurality of heat exchange channels 5 are opened in the vertical direction in the solid heat storage material 4, and the top inlet of each of the heat exchange channels 5 is communicated with the sieve holes on the upper sieve plate and each The bottom outlet of the heat exchange channel 5 communicates with the sieve holes on the lower sieve plate. A plurality of thermal storage temperature sensors 6 - 1 are installed on the solid thermal storage material 4 at upper and lower intervals to measure the temperature of the solid thermal storage material 4 .

The heat pump main engine 11, the evaporator inlet of the heat pump main engine 11 is communicated with the outlet b of the well pipe 2 through the first heat supply pipeline installed with the first valve 7-1, and the condenser outlet of the heat pump main engine 11 is connected through the first heat supply pipeline. The two heating pipelines are respectively connected with the water inlet of the user equipment (as shown in the figure, it may include the water inlet of the fan coil unit user 12, the water inlet of the radiator user 13 and the water inlet of the floor heating user 14), and the water outlet of the user equipment (the fan coil unit The water outlet of the user 12, the water outlet of the radiator user 13 and the water outlet of the floor heating user 14) are respectively communicated with the condenser inlet of the heat pump host 11 through the first return water pipeline on which the second water pump 8-2 is installed, and the heat pump host 11 The outlet of the evaporator is communicated with the inlet a of the well pipe 2 through the second return water pipeline installed with the first water pump 8-1 and the second valve 7-2.

The plate heat exchanger 9, the inlet 91 of the first fluid pipeline of the plate heat exchanger 9 communicates with the outlet of the first header pipe, and the inlet of the first header pipe passes through the first branch pipe installed with the fourth valve 7-4 It communicates with the outlet b of the well pipe 2 and communicates with the first return water pipeline between the second water pump 8-2 and the condenser inlet of the heat pump host 11 through the second branch pipe installed with the sixth valve 7-6; the The outlet 92 of the first fluid pipeline of the plate heat exchanger 9 communicates with the inlet of the second header pipe, and the outlet of the second header pipe passes through the third valve 7-3 and the fourth water pump 8-4 installed with the third pipe. The branch pipe communicates with the inlet a of the well pipe 2 and communicates with the second heat supply line through the fourth branch pipe installed with the fifth valve 7-5. The outlet 93 of the second fluid pipeline of the plate heat exchanger 9 is sequentially connected to the solar collector 10, the third water pump 8-3 and the inlet 94 of the second fluid pipeline of the plate heat exchanger 9 through the circulation pipeline. . A collector temperature sensor 6-2 is installed on the solar thermal collector 10.

The controller is connected with a plurality of thermal storage temperature sensors, collector temperature sensors, a third water pump 8-3 and a fourth water pump 8-4 through a control line.

The specific heat exchange process:

When heating in winter, the fourth valve 7-4, the third valve 7-3 and the fourth water pump 8-4 are closed, and the others are opened. The heat exchange circulating water enters the full-tube heat storage and heat exchange integrated well to exchange heat with the rock and soil mass. The return water enters the heat exchange channel 5 in the solid heat storage material 4 through the inlet a of the well pipe, and the return water is stored by the solid heat storage. After the material 4 is heated, it is sent to the user through the outlet b. After the temperature of the solid heat storage material 4 is lowered, the heat of the high temperature rock in the surrounding heat extraction section is absorbed through the well wall of the heat exchange channel and the heat exchange medium. When the heat demand is small, the solid heat storage material 4 stores heat while supplying heat, and when the heat demand is large, the solid heat storage material provides heat.

The heat exchange circulating water is heated by the rock and soil and enters the evaporator of the heat pump main engine 11. The heat exchange circulating water after the temperature is lowered enters the well pipe through the first water pump 8-1 for heat exchange; the heating return water passes through the second water pump 8 -2 are pumped to the heat pump host 11, the condenser and the plate heat exchanger 9, respectively, and then sent to the heating end of the heating user (the fan coil unit user 12, the radiator user 13 and the floor heating user 14) after being heated; the solar side The circulating water return water is pumped to the heat exchanger 9 by the third water pump 8-3, and enters the solar heat collector 10 after the temperature is lowered.

During the non-heating season, the fourth water pump 8-4, the third water pump 8-3, the plate heat exchanger 9, the solar collector 10, the third valve 7-3 and the fourth valve 7-4 are turned on, and other equipment is turned off . The plurality of thermal storage temperature sensors and the thermal collector temperature sensor transmit the detected temperature of the solid thermal storage material 4 and the temperature of the solar thermal collector 10 to the controller, and the controller transmits the detected temperature of the thermal thermal storage material 4 and the solar thermal collector according to the temperature of the solid thermal storage material 4 and the solar thermal collector. The fourth water pump 8-4 and the third water pump 8-3 are started or stopped depending on whether the temperature of the boiler 10 is high or low. For example, when the temperature of the solar thermal collector 10 is higher than the temperature of the solid thermal storage material 4, the fourth water pump 8-4 and the third water pump 8-3 start to operate to turn on the thermal storage function; When the temperature is lower than the temperature of the solid heat storage material 4, the fourth water pump 8-4 and the third water pump 8-3 stop running, and the solar heat storage function is turned off. The heat exchange circulating water enters the plate heat exchanger 9 through the fourth valve 7-4. After the temperature rises, it enters the well pipe through the third valve 7-3 and the fourth water pump 8-4 to heat the rock and soil bodies 1 and 8 respectively. The solid heat storage material 4 realizes the heat storage function.

Claims (1)

1. a full-tube type heat storage and heat exchange integrated well, characterized in that comprising: The well pipe is arranged in the rock and soil body, the upper part of the well pipe is located in the normal temperature stratum and the lower part is located in the temperature-increasing stratum, a partition plate is arranged in the vertical direction in the middle position of the well pipe, and the partition plate is arranged in the vertical direction. The bottom of the plate is fixedly connected with the top wall of the lower sieve plate, and the baffle plate divides the cavity of the well tube located above the lower sieve plate into a left chamber and a right chamber that are independent of each other, wherein the top of the left chamber serves as a The inlet of the well pipe, the top of the right chamber is used as the outlet of the well pipe; the inner wall of the left chamber and the inner wall of the right chamber located above the normal temperature stratum are respectively covered with thermal insulation layers, and the left chamber and The upper part of the right chamber is respectively fixed with an upper sieve plate along the horizontal direction, the upper sieve plate is fixedly connected with the inner wall of the well pipe and the partition plate, and the upper sieve plate, the lower sieve plate, the partition plate and the well pipe are surrounded by The left chamber and the right chamber are respectively filled with solid heat storage material, and a plurality of heat exchange channels are opened in the vertical direction in the solid heat storage material, and the top inlet of each heat exchange channel is connected to the upper The sieve holes on the sieve plate are communicated and the bottom outlet of each of the heat exchange channels is communicated with the sieve holes on the lower sieve plate, and a plurality of heat storage temperature sensors are installed on the solid heat storage material at upper and lower intervals to measure the solid heat storage. the temperature of the material; The heat pump host, the inlet of the evaporator of the heat pump host is connected with the outlet of the well pipe through the first heating pipeline installed with the first valve, and the outlet of the condenser of the heat pump host is respectively connected with the user through the second heating pipeline The water inlet of the equipment is connected, the water outlet of the user equipment is connected with the condenser inlet of the heat pump host through the first return water pipeline installed with the second water pump, and the evaporator outlet of the heat pump host is installed with the first water pump, The second return water pipeline of the second valve is communicated with the inlet of the well pipe; A plate heat exchanger, the inlet of the first fluid pipeline of the plate heat exchanger is communicated with the outlet of the first header pipe, and the inlet of the first header pipe is communicated with the outlet of the well pipe through the first branch pipe installed with the fourth valve And the second branch pipe installed with the sixth valve is connected to the first return water pipeline between the second water pump and the condenser inlet of the heat pump main engine; the outlet of the first fluid pipeline of the plate heat exchanger is connected to the first return water pipeline. The inlets of the two main pipes are communicated with the inlet of the well pipe, and the outlet of the second main pipe is communicated with the inlet of the well pipe through the third branch pipe installed with the third valve and the fourth water pump, and is connected with the second heat supply through the fourth branch pipe installed with the fifth valve The pipelines are connected, and the outlet of the second fluid pipeline of the plate heat exchanger is sequentially connected to the solar collector, the third water pump and the inlet of the second fluid pipeline of the plate heat exchanger through the circulation pipeline. A collector temperature sensor is installed on the solar collector; The controller is connected with a plurality of thermal storage temperature sensors, a collector temperature sensor, a third water pump and a fourth water pump through a control line.

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