Crude oil pipeline heating system based on heat pump cascade heat removal

Abstract

The invention belongs to the technical field of system heat supply and waste heat recovery, and particularly relates to a crude oil pipeline heating system based on heat pump cascade heat extraction, comprising a crude oil heating device communicated with crude oil; the crude oil treatment device is communicated with the crude oil heating device; the water treatment device is communicated with the crude oil treatment device; the heat pump device is in heat exchange connection with the water treatment device and the crude oil heating device; and the building heating system is connected between the heat pump device and the crude oil heating device in parallel. During use, the heat pump device supplies heat to the crude oil heating device and the building heating system, the crude oil heating device heats exploited crude oil, the heated crude oil enters the crude oil treatment device to be subjected to oil-water separation, separated oil is stored, separated water enters the water treatment device to be subjected to harmless treatment, and the temperature is adjusted. Then waste heat of the water is transferred to the heat pump device, and the water is discharged out of the heat pump device, so that heat recovery is realized, and energy waste and environmental pollution are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of system heating and waste heat recovery, and in particular relates to a crude oil pipeline heating system based on heat pump cascade heating. Background Art

[0002] In the process of separating crude oil, the hot water separated from the crude oil is usually discharged into the mine, which not only wastes heat but also pollutes groundwater. If the waste heat can be exchanged with other media through a heat exchanger and used for auxiliary heating, boiler water replenishment and waste heat, it can not only effectively solve the problem of energy waste, but also help increase the economic benefits of the enterprise.

[0003] Therefore, a crude oil pipeline heating system based on heat pump cascade heating is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide a crude oil pipeline heating system based on heat pump cascade heat extraction to solve the above problems.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A crude oil pipeline heating system based on heat pump cascade heat extraction, comprising:

[0007] A crude oil heating device, connected to the crude oil, for heating the produced crude oil;

[0008] A crude oil processing device, connected to the crude oil heating device, for separating oil from water in the crude oil;

[0009] a water treatment device, connected to the crude oil treatment device, for treating the high-temperature wastewater separated by the crude oil treatment device;

[0010] a heat pump device connected to the water treatment device and the crude oil heating device for heat exchange, the heat pump device being used to absorb waste heat of water in the water treatment device and to provide heat to the crude oil heating device;

[0011] The building heating system is connected in parallel between the heat pump device and the crude oil heating device.

[0012] In the crude oil pipeline heating system based on heat pump cascade heat extraction of the present invention, the crude oil heating device comprises:

[0013] A heat pipe heat exchanger, wherein the oil inlet of the heat pipe heat exchanger is connected to the crude oil, the oil outlet of the heat pipe heat exchanger is connected to the crude oil processing device, the heat pipe heat exchanger is connected to the heat pump device for heat exchange, and the heat pipe heat exchanger is used to heat the crude oil.

[0014] In the crude oil pipeline heating system based on heat pump cascade heat extraction of the present invention, the crude oil processing device comprises:

[0015] An oil-water separation device, whose oil inlet is connected to the oil outlet of the heat pipe heat exchanger, whose water outlet is connected to the water treatment device, and the oil-water separation device is used to separate oil and water from the crude oil;

[0016] An oil storage tank, connected to the oil outlet of the oil-water separation device, and used to store the separated oil;

[0017] An oil pump is arranged between the oil-water separator and the oil storage tank, and is used for conveying the separated oil to the oil storage tank.

[0018] In the crude oil pipeline heating system based on heat pump cascade heat extraction of the present invention, the water treatment device comprises:

[0019] A water treatment device, connected to the water outlet of the oil-water separation device, for performing harmless treatment on the water separated by the oil-water separation device;

[0020] A regulating water tank is communicated with the water treatment equipment and is used to regulate the temperature of water. The regulating water tank is connected to the heat pump device for heat exchange.

[0021] In the crude oil pipeline heating system based on heat pump cascade heat extraction of the present invention, the heat pump device comprises:

[0022] A first heat pump, wherein the hot water inlet is connected to the hot water outlet of the regulating water tank, and the cold water outlet is grounded;

[0023] The second heat pump is connected to an external heat source, the cold water outlet of the second heat pump is connected to the cold water inlet of the first heat pump, the hot water inlet is connected to the hot water outlet of the first heat pump, the hot water outlet of the second heat pump is connected to the hot water inlet of the heat pipe exchanger, the cold water inlet of the second heat pump is connected to the cold water outlet of the heat pipe exchanger, the hot water inlet of the building heating system is connected to the hot water outlet of the second heat pump, and the cold water outlet of the building heating system is connected to the cold water inlet of the second heat pump.

[0024] In the crude oil pipeline heating system based on heat pump cascade heat extraction of the present invention, the heat pump device comprises:

[0025] The second heat pump is connected to an external heat source, the cold water outlet of the second heat pump is grounded, the hot water inlet of the second heat pump is connected to the hot water outlet of the regulating water tank, the hot water outlet of the second heat pump is connected to the hot water inlet of the heat pipe exchanger, the cold water inlet of the second heat pump is connected to the cold water outlet of the heat pipe exchanger, the hot water inlet of the building heating system is connected to the hot water outlet of the second heat pump, and the cold water outlet of the building heating system is connected to the cold water inlet of the second heat pump.

[0026] In the crude oil pipeline heating system based on heat pump cascade heat extraction of the present invention, the first heat pump comprises:

[0027] A first evaporator, the hot water inlet of which is connected to the hot water outlet of the regulating water tank, and the cold water outlet of the first evaporator is grounded via a water pump;

[0028] The first condenser, the cold water inlet and the hot water outlet are all connected to the second heat pump, and the phase change medium circulates in the first evaporator and the first condenser to transfer the heat of the water in the regulating water pool to the second heat pump;

[0029] a first compressor, connected to a heat inlet of the first condenser and a heat outlet of the first evaporator, for improving the thermal quality of the phase change medium;

[0030] The first throttle valve is connected between the first evaporator and the first condenser. The first evaporator, the first condenser, the first compressor and the first throttle valve are connected in series in sequence to form a loop.

[0031] In the crude oil pipeline heating system based on heat pump cascade heat extraction of the present invention, the second heat pump comprises:

[0032] A second condenser, wherein a cold water inlet is connected to the heat pipe heat exchanger and the cold water outlet of the building heating system, and a hot water outlet is connected to the heat pipe heat exchanger and the hot water inlet of the building heating system;

[0033] A generator is connected to an external heat source, and a heat outlet of the generator is connected to a heat inlet of the second condenser;

[0034] An absorber is connected to the cold inlet of the generator through a solution pump, and a valve is connected in parallel between the absorber and the generator;

[0035] The second evaporator, the cold inlet is connected to the cold outlet of the second condenser through the second throttle valve, the hot water inlet of the second evaporator is connected to the hot water outlet of the first condenser, the cold water outlet of the second evaporator is connected to the cold water inlet of the first condenser, and the heat outlet of the second evaporator is connected to the heat inlet of the absorber.

[0036] Compared with the prior art, the present invention has the following advantages and technical effects:

[0037] When the system of the present invention is in use, the heat pump device is used to heat the crude oil heating device and the building heating system. The crude oil heating device heats the mined crude oil. The heated crude oil enters the crude oil processing device for oil-water separation. The separated oil is stored, and the separated water enters the water treatment device for harmless treatment and temperature adjustment. Then the waste heat of the water is transferred to the heat pump device, thereby realizing heat recovery and reducing energy waste and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0039] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 is a schematic structural diagram of the first heat pump in the present invention;

[0041] Figure 3 is a schematic structural diagram of the second heat pump in the present invention;

[0042] Among them, 1. heat pipe heat exchanger; 2. oil-water separation device; 3. water treatment equipment; 4. regulating water tank; 5. first heat pump; 6. second heat pump; 7. oil storage tank; 8. building heating system; 9. crude oil; 1-1. oil pump; 1-2. water pump; 5-1. first evaporator; 5-2. first throttle valve; 5-3. first condenser; 5-4. first compressor; 6-1. second condenser; 6-2. generator; 6-3. second throttle valve; 6-4. valve; 6-5. second evaporator; 6-6. absorber; 6-7. solution pump. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Reference Figures 1 to 3 The present invention discloses a crude oil pipeline heating system based on heat pump cascade heating, comprising:

[0046] A crude oil heating device, connected to the crude oil 9, for heating the produced crude oil;

[0047] A crude oil processing device, connected to the crude oil heating device, for separating oil from water in the crude oil;

[0048] A water treatment device, connected to the crude oil treatment device, for treating high-temperature wastewater separated by the crude oil treatment device;

[0049] A heat pump device is connected to the water treatment device and the crude oil heating device for heat exchange, and the heat pump device is used to absorb the waste heat of water in the water treatment device and to provide heat to the crude oil heating device;

[0050] The building heating system 8 is connected in parallel between the heat pump device and the crude oil heating device.

[0051] When the system of the present invention is in use, the heat pump device is used to heat the crude oil heating device and the building heating system 8. The crude oil heating device heats the mined crude oil 9. The heated crude oil 9 enters the crude oil processing device for oil-water separation. The separated oil is stored, and the separated water enters the water treatment device for harmless treatment and temperature adjustment. The waste heat of the water is then transferred to the heat pump device, and the water is discharged from the heat pump device, thereby realizing heat recovery and reducing energy waste and pollution to the environment.

[0052] In a feasible solution, the crude oil heating device includes:

[0053] The heat pipe heat exchanger 1 has an oil inlet connected to the crude oil 9 , an oil outlet connected to the crude oil processing device, and is connected to the heat pump device for heat exchange. The heat pipe heat exchanger 1 is used to heat the crude oil 9 .

[0054] In one feasible solution, the crude oil processing unit includes:

[0055] The oil-water separation device 2 has an oil inlet connected to the oil outlet of the heat pipe heat exchanger 1, and a water outlet of the oil-water separation device 2 connected to the water treatment device. The oil-water separation device 2 is used to separate oil and water from the crude oil 9;

[0056] The oil storage tank 7 is connected to the oil outlet of the oil-water separation device 2, and the oil storage tank 7 is used to store the separated oil;

[0057] The oil pump 1 - 1 is arranged between the oil-water separator 2 and the oil storage tank 7 , and is used to transport the separated oil to the oil storage tank 7 .

[0058] In one feasible solution, the water treatment device includes:

[0059] The water treatment device 3 is connected to the water outlet of the oil-water separation device 2 and is used for harmlessly treating the water separated by the oil-water separation device 2;

[0060] The regulating water pool 4 is connected to the water treatment equipment 3 and is used to regulate the temperature of water. The regulating water pool 4 is connected to the heat pump device for heat exchange.

[0061] In one feasible solution, the heat pump device comprises:

[0062] The first heat pump 5 has a hot water inlet connected to the hot water outlet of the regulating water tank 4 and a cold water outlet connected to the ground;

[0063] The first heat pump 5 is preferably a steam compression heat pump;

[0064] The second heat pump 6 is connected to an external heat source, the cold water outlet of the second heat pump 6 is connected to the cold water inlet of the first heat pump 5, the hot water inlet is connected to the hot water outlet of the first heat pump 5, the hot water outlet of the second heat pump 6 is connected to the hot water inlet of the heat pipe heat exchanger 1, the cold water inlet of the second heat pump 6 is connected to the cold water outlet of the heat pipe heat exchanger 1, the hot water inlet of the building heating system 8 is connected to the hot water outlet of the second heat pump 6, and the cold water outlet of the building heating system 8 is connected to the cold water inlet of the second heat pump 6.

[0065] The second heat pump 6 is preferably a direct-fired lithium bromide absorption heat pump;

[0066] In a feasible solution, the first heat pump 5 comprises:

[0067] The first evaporator 5-1, the hot water inlet is connected to the hot water outlet of the regulating water tank 4, and the cold water outlet of the first evaporator 5-1 is grounded through the water pump 1-2;

[0068] The first condenser 5-3, the cold water inlet and the hot water outlet are both connected to the second heat pump 6, and the phase change medium circulates in the first evaporator 5-1 and the first condenser 5-3 to transfer the heat of the water in the regulating water pool 4 to the second heat pump 6;

[0069] The first compressor 5 - 4 is connected to the heat inlet of the first condenser 5 - 3 and the heat outlet of the first evaporator 5 - 1 , and is used to improve the thermal quality of the phase change medium;

[0070] The first throttle valve 5-2 is connected between the first evaporator 5-1 and the first condenser 5-3. The first evaporator 5-1, the first condenser 5-3, the first compressor 5-4 and the first throttle valve 5-2 are connected in series in sequence to form a loop.

[0071] In a feasible solution, the second heat pump 6 comprises:

[0072] The second condenser 6-1 has a cold water inlet connected to the heat pipe heat exchanger 1 and the cold water outlet of the building heating system 8, and a hot water outlet connected to the heat pipe heat exchanger 1 and the hot water inlet of the building heating system 8;

[0073] The generator 6-2 is connected to an external heat source, and the heat outlet of the generator 6-2 is connected to the heat inlet of the second condenser 6-1;

[0074] The absorber 6-6 is connected to the cold inlet of the generator 6-2 through the solution pump 6-7, and a valve 6-4 is connected in parallel between the absorber 6-6 and the generator 6-2;

[0075] The cold inlet of the second evaporator 6-5 is connected to the cold outlet of the second condenser 6-1 through the second throttle valve 6-3, the hot water inlet of the second evaporator 6-5 is connected to the hot water outlet of the first condenser 5-3, the cold water outlet of the second evaporator 6-5 is connected to the cold water inlet of the first condenser 5-3, and the heat outlet of the second evaporator 6-5 is connected to the heat inlet of the absorber 6-6.

[0076] Example 1

[0077] This example is applied to areas where electricity is relatively sufficient but natural gas is relatively scarce. Crude oil 9 enters the heat pipe heat exchanger 1 through the oil inlet of the heat pipe heat exchanger 1. The second condenser 6-1 passes hot water into the heat pipe heat exchanger 1 to heat the crude oil 9. After the crude oil 9 is heated to the set temperature, it enters the oil-water separation device 2 for oil-water separation. The separated oil is passed into the oil storage tank 7 under the action of the oil pump 1-1. The separated water enters the water treatment equipment 3 for harmless treatment. The harmless water enters the regulating water pool 4 to adjust the water temperature. After the water temperature is adjusted to a suitable temperature, it is injected into the first evaporator 5-1 of the first heat pump 5 to exchange heat with the phase change medium in the first evaporator 5-1. The water after heat exchange passes through the first evaporator The cold water outlet of the device 5-1 is led into the ground by the water pump 1-2. The phase change medium of the first evaporator 5-1 flows through the first compressor 5-4 to improve the thermal quality of the phase change medium, and then enters the heat inlet of the first condenser 5-3 to complete the heat exchange with the second evaporator 6-5. The phase change medium in the second evaporator 6-5 flows through the absorber 6-6 and the generator 6-2 in sequence for reheating and then enters the second condenser 6-1 to exchange heat with the heat pipe heat exchanger 1 and the building heating system 8, completing the heating of the heat pipe heat exchanger 1 and the building heating system 8, and realizing the recovery of waste heat from waste water. At the same time, the heating of the phase change medium in the second heat pump 6 by the first heat pump 5 can effectively reduce the use of natural gas.

[0078] The water temperature after being regulated in the regulating water pool 4 is about 30°C, the water temperature after being heated by the second heat pump 6 is about 85°C, and the water temperature at the cold water outlet of the first evaporator 5-1 is about 10°C.

[0079] Example 2

[0080] The difference from Example 1 is that this example is applied to areas where natural gas is sufficient but electricity is relatively scarce, and the heat pump device includes: a second heat pump 6, which is connected to an external heat source, the cold water outlet of the second heat pump 6 is grounded, the hot water inlet of the second heat pump 6 is connected to the hot water outlet of the regulating water tank 4, the hot water outlet of the second heat pump 6 is connected to the hot water inlet of the heat pipe heat exchanger 1, the cold water inlet of the second heat pump 6 is connected to the cold water outlet of the heat pipe heat exchanger 1, the hot water inlet of the building heating system 8 is connected to the hot water outlet of the second heat pump 6, and the cold water outlet of the building heating system 8 is connected to the cold water inlet of the second heat pump 6.

[0081] The hot water inlet of the second evaporator 6-5 is connected to the hot water outlet of the regulating water tank 4, and the cold water outlet of the second evaporator 6-5 is transported to the ground through the water pump 1-2, thereby realizing the recovery of waste heat of waste water and reducing the consumption of electricity.

[0082] Example 3

[0083] The difference from Example 1 and Example 2 is that this example is applied to areas where natural gas and electricity are sufficient. At this time, the heat pump device can select either the first heat pump 5 or the second heat pump 6, or a combination of the first heat pump 5 and the second heat pump 6.

[0084] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0085] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A crude oil pipeline heating system based on heat pump cascade heat extraction, characterized in that: include: A crude oil heating device, connected to the crude oil (9), for heating the extracted crude oil; A crude oil processing device, connected to the crude oil heating device, for separating oil from water in the crude oil; a water treatment device, connected to the crude oil treatment device, for treating the high-temperature wastewater separated by the crude oil treatment device; a heat pump device connected to the water treatment device and the crude oil heating device for heat exchange, the heat pump device being used to absorb waste heat of water in the water treatment device and to provide heat to the crude oil heating device; A building heating system (8) is connected in parallel between the heat pump device and the crude oil heating device.

2. The crude oil pipeline heating system based on heat pump cascade heating according to claim 1 is characterized in that: The crude oil heating device comprises: A heat pipe heat exchanger (1), wherein the oil inlet of the heat pipe heat exchanger (1) is connected to the crude oil (9), the oil outlet of the heat pipe heat exchanger (1) is connected to the crude oil processing device, the heat pipe heat exchanger (1) is connected to the heat pump device for heat exchange, and the heat pipe heat exchanger (1) is used to heat the crude oil (9).

3. The crude oil pipeline heating system based on heat pump cascade heating according to claim 2 is characterized in that: The crude oil processing device comprises: An oil-water separation device (2), the oil inlet of which is in communication with the oil outlet of the heat pipe heat exchanger (1), the water outlet of the oil-water separation device (2) being in communication with the water treatment device, the oil-water separation device (2) being used for separating oil and water from the crude oil (9); An oil storage tank (7) is communicated with the oil outlet of the oil-water separation device (2), and the oil storage tank (7) is used to store the separated oil; The oil pump (1-1) is arranged between the oil-water separation device (2) and the oil storage tank (7) and is used to transport the separated oil to the oil storage tank (7).

4. The crude oil pipeline heating system based on heat pump cascade heating according to claim 3 is characterized in that: The water treatment device comprises: A water treatment device (3) is connected to the water outlet of the oil-water separation device (2) and is used to perform harmless treatment on the water separated by the oil-water separation device (2); The regulating water tank (4) is connected to the water treatment equipment (3) and is used to regulate the temperature of water. The regulating water tank (4) is connected to the heat pump device for heat exchange.

5. The crude oil pipeline heating system based on heat pump cascade heating according to claim 4 is characterized in that: The heat pump device comprises: A first heat pump (5), wherein the hot water inlet is connected to the hot water outlet of the regulating water tank (4), and the cold water outlet is grounded; The second heat pump (6) is connected to an external heat source, the cold water outlet of the second heat pump (6) is connected to the cold water inlet of the first heat pump (5), the hot water inlet is connected to the hot water outlet of the first heat pump (5), the hot water outlet of the second heat pump (6) is connected to the hot water inlet of the heat pipe heat exchanger (1), the cold water inlet of the second heat pump (6) is connected to the cold water outlet of the heat pipe heat exchanger (1), the hot water inlet of the building heating system (8) is connected to the hot water outlet of the second heat pump (6), and the cold water outlet of the building heating system (8) is connected to the cold water inlet of the second heat pump (6).

6. The crude oil pipeline heating system based on heat pump cascade heating according to claim 4 is characterized in that: The heat pump device comprises: The second heat pump (6) is connected to an external heat source, the cold water outlet of the second heat pump (6) is grounded, the hot water inlet of the second heat pump (6) is connected to the hot water outlet of the regulating water tank (4), the hot water outlet of the second heat pump (6) is connected to the hot water inlet of the heat pipe heat exchanger (1), the cold water inlet of the second heat pump (6) is connected to the cold water outlet of the heat pipe heat exchanger (1), the hot water inlet of the building heating system (8) is connected to the hot water outlet of the second heat pump (6), and the cold water outlet of the building heating system (8) is connected to the cold water inlet of the second heat pump (6).

7. The crude oil pipeline heating system based on heat pump cascade heating according to claim 5 is characterized in that: The first heat pump (5) comprises: A first evaporator (5-1), a hot water inlet of which is connected to a hot water outlet of the regulating water tank (4), and a cold water outlet of the first evaporator (5-1) is grounded via a water pump (1-2); The first condenser (5-3), the cold water inlet and the hot water outlet are both connected to the second heat pump (6), and the phase change medium circulates in the first evaporator (5-1) and the first condenser (5-3) to transfer the heat of the water in the regulating water pool (4) to the second heat pump (6); A first compressor (5-4) is connected to a heat inlet of the first condenser (5-3) and a heat outlet of the first evaporator (5-1) and is used to improve the thermal quality of the phase change medium; The first throttle valve (5-2) is connected between the first evaporator (5-1) and the first condenser (5-3), and the first evaporator (5-1), the first condenser (5-3), the first compressor (5-4) and the first throttle valve (5-2) are connected in series in sequence to form a loop.

8. The crude oil pipeline heating system based on heat pump cascade heating according to claim 7 is characterized in that: The second heat pump (6) comprises: A second condenser (6-1), wherein a cold water inlet is connected to the heat pipe heat exchanger (1) and the cold water outlet of the building heating system (8), and a hot water outlet is connected to the heat pipe heat exchanger (1) and the hot water inlet of the building heating system (8); A generator (6-2) is connected to an external heat source, and a heat outlet of the generator (6-2) is connected to a heat inlet of the second condenser (6-1); An absorber (6-6) is connected to the cold inlet of the generator (6-2) via a solution pump (6-7), and a valve (6-4) is connected in parallel between the absorber (6-6) and the generator (6-2); The second evaporator (6-5), the cold inlet of which is connected to the cold outlet of the second condenser (6-1) through the second throttle valve (6-3), the hot water inlet of the second evaporator (6-5) is connected to the hot water outlet of the first condenser (5-3), the cold water outlet of the second evaporator (6-5) is connected to the cold water inlet of the first condenser (5-3), and the heat outlet of the second evaporator (6-5) is connected to the heat inlet of the absorber (6-6).

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