Solar heat pipe collector

Abstract

The utility model belongs to the field of crude oil heating, and particularly relates to a solar heat pipe heat collector which comprises a heat exchange cylinder and a plurality of solar heat pipes, the tops of the solar heat pipes stretch into an inner cavity of the heat exchange cylinder in a sealed mode, and the two ends of the heat exchange cylinder are communicated with a heating cover for heating an air energy heat pump evaporator through circulating pipes. And the circulating pipe is communicated with a fan for providing power for air in the circulating pipe. An inner cavity of the heating cover is hollow, an opening is formed in one side of the heating cover, a sealing gasket is arranged on the edge of the opening, and the opening is hermetically installed on one side of the exposed bent portion of the evaporator coil. The heat absorption layer on the surface of the heat exchange pipe absorbs sunlight heat, the heat exchange pipe conducts heat to liquid propylene glycol at the bottom of an inner cavity of the heat exchange pipe after being heated, the pipe wall at the upper end of the heat exchange pipe conducts heat to air in the heat exchange cylinder after being heated, and the heated air is driven by the fan to flow. And the heated air flows into the heating cover to heat the exposed bent part of the evaporator coil, so that the temperature of the air energy heat pump evaporator is increased, and the air energy heat pump evaporator can continuously heat crude oil in severe cold areas.

Description

Technical Field

[0001] This utility model belongs to the field of crude oil heating, and in particular relates to a solar heat pipe collector. Background Technology

[0002] Freshly extracted crude oil is a very complex mixture. Most Chinese crude oil has a high wax content (high molecular weight alkanes), making it very viscous at room temperature and difficult to transport. For example, Daqing crude oil, which accounts for about one-third of my country's production, has a wax content of about 26% and a high pour point of 32 degrees Celsius. When high-wax crude oil is heated, the thermal mobility of the crude oil molecules increases, and the mutual binding force between them weakens. On the one hand, this thins the liquid hydrocarbons, allowing more wax to dissolve; on the other hand, it loosens and disintegrates the spongy wax structure, forming many small wax particles distributed in the liquid hydrocarbons. The solid hydrocarbons become a dispersed phase, and the liquid hydrocarbons become a continuous phase, allowing the crude oil to flow and be transported along pipelines. Therefore, heating the crude oil is an essential step.

[0003] In existing technology, an air source heat pump is used to heat the water in the water tank. The heated water then enters a shell-and-tube heat exchanger to exchange heat with the crude oil inside, thereby completing the heating of the crude oil.

[0004] However, in cold regions such as Inner Mongolia, Daqing, and Xinjiang, the air temperature is too low, causing the evaporator of the air source heat pump to fail to operate, thus preventing the heating of crude oil. Therefore, the technical problem to be solved is to provide a collector that can provide heat to the evaporator of the air source heat pump so that the evaporator can heat crude oil in frigid regions. Utility Model Content

[0005] The present invention proposes a solar heat pipe collector that solves the above-mentioned problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a solar heat pipe collector, comprising a heat exchange cylinder and a plurality of solar heat pipes with sealed tops extending into the inner cavity of the heat exchange cylinder, wherein the two ends of the heat exchange cylinder are connected to a heating cover for heating an air source heat pump evaporator via a circulation pipe, and a fan for providing power to the air in the circulation pipe is connected to the circulation pipe.

[0007] Preferably, the heating cover has a hollow inner cavity, an opening on one side of the heating cover, a sealing gasket on the edge of the opening, and the opening seal is installed on the exposed bending part of the evaporator coil.

[0008] Preferably, the circulation pipe includes a first circulation pipe and a second circulation pipe;

[0009] The two ends of the first circulation pipe are respectively connected to the air outlet of the heat exchange cylinder and the air inlet of the heating shroud;

[0010] The two ends of the second circulation pipe are respectively connected to the air inlet of the heat exchange cylinder and the air outlet of the heating shroud.

[0011] Preferably, the first circulation pipe is connected to a one-way valve for supplying air to the hot cylinder; the fan is connected to the second circulation pipe.

[0012] Preferably, the solar heat pipe includes a vacuum tube with an inner vacuum and a heat exchange tube with its lower end sealed inside the vacuum tube. A gap is left between the bottom of the heat exchange tube and the bottom of the vacuum tube to allow for thermal expansion and contraction of the heat exchange tube. Both ends of the heat exchange tube are sealed.

[0013] The upper end of the heat exchange tube extends upward from the vacuum tube, and the outer wall of the portion of the heat exchange tube located inside the vacuum tube is coated with a heat-absorbing layer.

[0014] The heat exchange tube is sealed at both ends, and its inner cavity is filled with a heat exchange medium, which is propylene glycol.

[0015] Preferably, the top of the heat exchange tube is sealed and extends into the inner cavity of the heat exchange cylinder to heat the air inside the heat exchange cylinder.

[0016] The beneficial effects of this utility model are:

[0017] This invention includes a heat exchange cylinder and several solar heat pipes with sealed tops extending into the inner cavity of the heat exchange cylinder. Both ends of the heat exchange cylinder are connected via circulation pipes to a heating shroud for heating the evaporator of an air-source heat pump. A fan is connected to the circulation pipes to power the air within them. The inner cavity of the heating shroud is hollow, with an opening on one side. A sealing gasket is placed at the edge of the opening, and the opening seal is installed on the exposed bend of the evaporator coil. The heat-absorbing layer on the surface of the heat exchange pipe absorbs solar heat. After being heated, the heat exchange pipe transfers heat to liquid propylene glycol at the bottom of its inner cavity. The liquid propylene glycol vaporizes and rises to the top of the heat exchange pipe, heating the upper wall of the pipe. The heated upper wall then conducts heat to the air inside the heat exchange cylinder, further heating the air within. Driven by the fan, the heated air flows into the heating shroud to heat the exposed bend of the evaporator coil, thus increasing the temperature of the air-source heat pump evaporator and enabling it to continue heating crude oil in extremely cold regions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the exposed bending point of the heating cover and evaporator coil of this utility model.

[0020] Figure 3 This is a schematic diagram of the heating cover structure of this utility model.

[0021] Figure 4 This is a schematic diagram of the solar heat pipe structure of this utility model.

[0022] In the diagram: 1-Heating cover, 11-Opening, 2-Heat exchange cylinder, 3-Solar heat pipe, 31-Vacuum tube, 32-Heat exchange tube, 33-Heat exchange medium, 4-First circulation pipe, 5-Second circulation pipe, 6-One-way valve, 7-Fan, 8-Air source heat pump evaporator, 81-Exposed bend of evaporator coil. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Reference Figures 1-4 A solar heat pipe collector includes a heat exchange cylinder 2 and several solar heat pipes 3 with sealed tops that extend into the inner cavity of the heat exchange cylinder 2. The two ends of the heat exchange cylinder 2 are connected to a heating cover 1 that heats an air source heat pump evaporator 8 via a circulation pipe. A fan 7 that provides power to the air in the circulation pipe is connected to the circulation pipe.

[0025] It should be noted that using an air source heat pump to heat the water in the tank, and then having the heated water enter a shell-and-tube heat exchanger to exchange heat with the crude oil inside, thereby completing the heating of the crude oil, is a common existing technology. Therefore, its working principle and structure will not be described in detail.

[0026] The heating cover 1 has a hollow inner cavity, and an opening 11 is provided on one side of the heating cover 1. A sealing gasket is provided at the edge of the opening 11. The opening 11 is installed on the side of the exposed bend 81 of the evaporator coil by bolts. Figure 2 The diagram shows the connection between the exposed bend 81 of the evaporator coil and the heating cover 1. The exposed bend 81 of the evaporator coil is sealed inside the heating cover 1.

[0027] The circulation pipe includes a first circulation pipe 4 and a second circulation pipe 5; the two ends of the first circulation pipe 4 are respectively connected to the air outlet of the heat exchange cylinder 2 and the air inlet of the heating cover 1; the two ends of the second circulation pipe 5 are respectively connected to the air inlet of the heat exchange cylinder 2 and the air outlet of the heating cover 1.

[0028] The first circulation pipe 4 is connected to a one-way valve 6 that supplies air to the heat exchange cylinder 2; the fan 7 is connected to the second circulation pipe 5, which drives the hot air to circulate in a closed loop within the heat exchange cylinder 2, the first circulation pipe 4, the second circulation pipe 5 and the heating cover 1.

[0029] The solar heat pipe 3 includes a vacuum tube 31 with an inner vacuum and a heat exchange tube 32 sealed at its lower end within the inner cavity of the vacuum tube 31. A gap is provided between the bottom of the heat exchange tube 32 and the bottom of the vacuum tube 31 to allow for thermal expansion and contraction of the heat exchange tube 32. Both ends of the heat exchange tube 32 are sealed. The upper end of the heat exchange tube 32 extends upwards out of the vacuum tube 31. The outer wall of the portion of the heat exchange tube 32 located within the inner cavity of the vacuum tube 31 is coated with a heat-absorbing layer. Both ends of the heat exchange tube 32 are sealed, and its inner cavity contains a heat exchange medium 33, which is propylene glycol. The top of the heat exchange tube 32 is sealed and extends into the inner cavity of the heat exchange cylinder 2 to heat the air inside the heat exchange cylinder 2.

[0030] The heat-absorbing layer on the surface of the heat exchange tube 32 absorbs solar heat. After being heated, the heat exchange tube 32 conducts heat to the liquid propylene glycol at the bottom of its inner cavity. The liquid propylene glycol vaporizes and rises to the top of the heat exchange tube 32, heating the upper wall of the heat exchange tube 32. The heated upper wall of the heat exchange tube 32 conducts heat to the air in the heat exchange cylinder 2, thereby heating the air in the heat exchange cylinder 2. The heated air flows under the drive of the fan to form hot air. The hot air flows into the heating shroud 1 to heat the exposed bend 81 of the evaporator coil. The temperature of the hot air entering the heating shroud 1 can reach 180°C, and the temperature of the hot air after heating the evaporator coil can reach 70°C, which increases the temperature of the air source heat pump evaporator, allowing it to continue heating crude oil in extremely cold regions.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A solar heat pipe collector, comprising a heat exchange cylinder (2) and a plurality of solar heat pipes (3) with sealed tops extending into the inner cavity of the heat exchange cylinder (2), characterized in that: The heat exchange cylinder (2) is connected to a heating cover (1) for heating the air-source heat pump evaporator (8) through a circulation pipe at both ends. A fan (7) is connected to the circulation pipe to provide power to the air in the circulation pipe.

2. The solar heat pipe collector according to claim 1, characterized in that: The heating cover (1) has a hollow inner cavity and an opening (11) is provided on one side of the heating cover (1). A sealing gasket is provided on the edge of the opening (11) and the opening (11) is sealed and installed on the side of the exposed bend (81) of the evaporator coil.

3. The solar heat pipe collector according to claim 2, characterized in that: The circulation pipe includes a first circulation pipe (4) and a second circulation pipe (5); The first circulation pipe (4) is connected at both ends to the outlet of the heat exchange cylinder (2) and the inlet of the heating cover (1), respectively. The two ends of the second circulation pipe (5) are respectively connected to the air inlet of the heat exchange cylinder (2) and the air outlet of the heating cover (1).

4. The solar heat pipe collector according to claim 3, characterized in that: The first circulation pipe (4) is connected to a one-way valve (6) for supplying air to the hot cylinder (2); The fan (7) is connected to the second circulation pipe (5).

5. The solar heat pipe collector according to claim 4, characterized in that: The solar heat pipe (3) includes a vacuum tube (31) with an inner vacuum and a heat exchange tube (32) with its lower end sealed inside the vacuum tube (31). A gap is left between the bottom of the heat exchange tube (32) and the bottom of the vacuum tube (31) for thermal expansion and contraction of the heat exchange tube (32). Both ends of the heat exchange tube (32) are sealed. The upper end of the heat exchange tube (32) extends upward from the vacuum tube (31), and the outer wall of the portion of the heat exchange tube (32) located in the inner cavity of the vacuum tube (31) is coated with a heat-absorbing layer. The heat exchange tube (32) is sealed at both ends, and its inner cavity is provided with a heat exchange medium (33), which is propylene glycol.

6. The solar heat pipe collector according to claim 5, characterized in that: The top of the heat exchange tube (32) is sealed and extends into the inner cavity of the heat exchange cylinder (2) to heat the air inside the inner cavity of the heat exchange cylinder (2).

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