Air-water cascade heat pump heating device for heating wellhead of oil field

Abstract

The utility model belongs to the field of heat pump heating, and particularly relates to an air-water cascade type heat pump heating device for heating a wellhead of an oil field, which is characterized by comprising an air source heat pump. An inlet of the air source heat pump is connected with a buffer water tank and an energy storage water tank through a primary heat circulating water pump, the water source heat pump is connected with the buffer water tank through a valve, and the energy storage water tank is connected with an inlet of a condenser of the water source heat pump through an energy storage circulating water pump. The process heat exchange device is connected with the energy storage water tank through a process heating circulating water pump, and an outlet of the process heat exchange device is connected with the energy storage water tank. Heat produced by the air source heat pump provides a low-temperature heat source for the water source heat pump through the buffer water tank, high-temperature heat energy produced by the water source heat pump heats water in the energy storage water tank, and hot water in the energy storage water tank is used for heating oil well produced liquid through the process heat exchange device.

Description

Technical Field

[0001] The utility model belongs to the field of heat pump heating, in particular to an air-water cascade heat pump heating device used for heating oil field wellheads. Background Art

[0002] The crude oil extracted from the oil field wells is a mixture of oil and water. In order to prevent it from waxing, it needs to be heated. At present, the use of coal-fired boilers, gas boilers, electric boilers or electric heating devices for heating has problems such as low efficiency, high energy consumption, unsafe and environmentally unfriendly. In order to save energy, reduce carbon emissions, improve safety and protect the environment, various oil production units are exploring the use of new energy technologies such as heat pumps to replace the original heating devices.

[0003] However, the energy efficiency of the heat pump decreases as the outlet water temperature increases. Simply using heat pump equipment to replace the original heating device is not energy efficient, the operating cost is not low, and the stability is insufficient under low ambient temperature conditions. Summary of the invention

[0004] The purpose of the utility model is to address the shortcomings of simple heat pump heating technology and propose an air-water cascade heat pump heating device for oil field wellhead heating. By cascading coupling of an air source heat pump, a water source heat pump, an energy storage tank and a process heat exchange device, the energy efficiency and stability of the heating device are improved and the heating cost is reduced.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] The utility model discloses an air-water cascade heat pump heating device for oilfield wellhead heating, which is characterized by comprising an air source heat pump, an inlet of the air source heat pump being connected to a buffer water tank and an energy storage water tank via a primary heat circulation water pump, a water source heat pump connected to the buffer water tank via a valve, an energy storage water tank connected to the inlet of the water source heat pump condenser via an energy storage circulation water pump, a process heat exchange device connected to the energy storage water tank via a process heating circulation water pump, and an outlet of the process heat exchange device being connected to the energy storage water tank.

[0007] The outlet of the air source heat pump is connected to the inlet of the water source heat pump evaporator through a valve, the air source heat pump is connected to the energy storage water tank through a primary heat circulation water pump, and the outlet of the water source heat pump condenser is connected to the energy storage water tank through a valve.

[0008] The outlet of the water source heat pump condenser is connected to the startup emergency heating device.

[0009] The emergency heating device has an outlet connected to the energy storage water tank and an inlet connected to the outlet of the energy storage circulating water pump.

[0010] The energy storage water tank is connected to the process heat exchange device through a pipeline.

[0011] Advantages of the utility model:

[0012] The utility model discloses an air-water cascade heat pump heating device for oil field wellhead heating. The heat produced by the air source heat pump provides a low-temperature heat source for the water source heat pump through a buffer water tank. The high-temperature thermal energy generated by the water source heat pump heats the water in the energy storage tank. The hot water in the energy storage tank is then used to heat the produced fluid of the oil well through a process heat exchange device. When the ambient temperature is high, the air source heat pump can also directly heat the water in the energy storage tank without starting the water source heat pump. When the heating capacity of the heat pump is insufficient, the emergency heating device can be started to supplement heat for the system. The cascade heating of the air source heat pump and the water source heat pump solves the problem of the stability of heating under low ambient temperature and high output temperature conditions. The energy storage tank uses cheap off-peak electricity to provide thermal energy as much as possible. The process heat exchange device reduces the heating temperature and improves the energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0014] The specific implementation of the present utility model is further described below in conjunction with the accompanying drawings.

[0015] like Figure 1 As shown, the utility model is an air-water cascade heat pump heating device for oilfield wellhead heating, which is characterized by comprising an air source heat pump 1, the inlet of the air source heat pump 1 is connected to a buffer water tank 3 and an energy storage water tank 6 through a primary heat circulation water pump 2, a water source heat pump 4 connected to the buffer water tank 3 through a valve, an energy storage water tank 6 connected to the condenser inlet of the water source heat pump 4 through an energy storage circulation water pump 5, and a process heat exchange device 8 connected to the energy storage water tank 6 through a process heating circulation water pump 7, and the outlet of the process heat exchange device 8 is connected to the energy storage water tank 6.

[0016] The inlet of the air source heat pump 1 is connected to the outlet of the evaporator of the water source heat pump 4 through a valve, the air source heat pump 1 is connected to the energy storage water tank 6 through a valve, and the condenser inlet of the water source heat pump 4 is connected to the energy storage water tank 6 through a valve. The heat generated by the air source heat pump 1 can be used to heat the water in the buffer water tank 3 or directly heat the water in the energy storage water tank 6. The water in the buffer water tank 3 has a low temperature and is used to provide a low-temperature heat source for the water source heat pump 4. The water in the energy storage water tank 6 has a high temperature and is used to provide a high-temperature heat source for the process heat exchange device 8.

[0017] The condenser inlet of the water source heat pump 4 is connected to the startup emergency heating device 9.

[0018] The emergency heating device 9 has an outlet connected to the energy storage water tank 6 , and an inlet connected to the inlet of the condenser of the water source heat pump 4 and the outlet of the energy storage circulation pump 5 .

[0019] The energy storage water tank 6 is connected to the process heat exchange device 8 through a pipeline. The hot water with a relatively high temperature stored in the energy storage water tank 6 heats the oil well produced fluid through the process heat exchange device 8 to reduce the temperature difference between the heat pump outlet water and the oil well produced fluid, reduce the heat pump outlet water temperature, and improve energy efficiency.

[0020] The utility model is an air-water cascade heat pump heating device for oil field wellhead heating. Each component works in coordination. The specific functions of the components are as follows:

[0021] The air source heat pump 1, whose inlet is connected to the buffer water tank 3, the evaporator outlet of the water source heat pump 4 and the energy storage tank 6 through the primary heat circulation water pump 2, and whose outlet is connected to the evaporator inlet of the water source heat pump 4 and the hot water storage tank 6 through valves, is used to obtain free low-grade heat energy from the air through electric energy drive to provide heat for the system;

[0022] Primary heat circulation water pump 2: its outlet is connected to the air source heat pump 1 through a valve, and its inlet is connected to the buffer water tank 3 and the energy storage water tank 6 through valves respectively, and its function is to transport the heat produced by the air source heat pump 1;

[0023] Buffer water tank 3: its outlet is connected to the primary heat circulation water pump 2 through a valve, and its inlet is connected to the evaporator of the water source heat pump 4 through a valve. Its function is to store a certain amount of heat to ensure that the operation of the water source heat pump 4 is not affected by the suspension of the air source heat pump 1;

[0024] The water source heat pump 4 has an evaporator outlet connected to the buffer water tank 3 through a valve, an evaporator inlet connected to the air source heat pump 1 through a valve, a condenser outlet connected to the hot water storage tank 6 and the emergency heating device 9 through valves, and a condenser inlet connected to the energy storage circulation water pump 5 through a valve;

[0025] Energy storage circulation water pump 5: its outlet is connected to the water source heat pump 4 through a valve, and its inlet is connected to the energy storage water tank 6 through a valve. Its function is to make use of low-priced valley electricity and flat electricity as much as possible to reduce operating costs;

[0026] The energy storage water tank 6 has two sets of inlets and outlets, namely, a heat storage cycle inlet and an outlet and a heat release cycle inlet and outlet. The heat storage cycle outlet is connected to the primary heat circulation water pump 2 and the energy storage circulation water pump 5 through valves, and the heat storage cycle inlet is connected to the air source heat pump 1, the water source heat pump 4 and the emergency heating device 9 through valves;

[0027] The process heating circulating water pump 7 has its inlet connected to the energy storage water tank 6 and its outlet connected to the process heat exchange device 8, and its function is to utilize low-priced valley electricity and flat electricity as much as possible to reduce the operating cost;

[0028] A process heat exchange device 8, whose outlet is connected to the energy storage water tank 6, whose inlet is connected to the process heating circulation water pump 7, and whose external circulation inlet and outlet are respectively connected to the oil well produced liquid delivery pipeline;

[0029] The emergency heating device 9 has an outlet connected to the energy storage water tank 6 and an inlet connected to the energy storage circulation water pump 5. Its function is to supplement heat for the system when the heating capacity of the heat pump is insufficient.

[0030] The heating process of the device is as follows: the heat produced by the air source heat pump 1 provides a low-temperature heat source for the water source heat pump 4, the buffer water tank 3 provides a buffer function for the safe operation of the water source heat pump 4 and the air source heat pump 1, the high-temperature heat energy generated by the water source heat pump 4 heats the water in the energy storage tank 6, and then the hot water in the energy storage tank 6 is used to heat the oil well produced fluid through the process heat exchange device 8. In the case of high ambient temperature, the air source heat pump 1 can also directly heat the water in the energy storage tank 6 without starting the water source heat pump 4. In the case of insufficient heating capacity of the heat pump, the emergency heating device 9 can be started to supplement heat for the system.

Claims

1. An air-water cascade heat pump heating device for oil field wellhead heating, characterized in that It includes an air source heat pump, a buffer water tank and an energy storage water tank connected to the inlet of the air source heat pump through a primary heat circulation water pump, a water source heat pump connected to the buffer water tank through a valve, an energy storage water tank connected to the inlet of the water source heat pump condenser through an energy storage circulation water pump, and a process heat exchange device connected to the energy storage water tank through a process heating circulation water pump, and the outlet of the process heat exchange device is connected to the energy storage water tank.

2. The air-water cascade heat pump heating device for oil field wellhead heating according to claim 1, characterized in that: The outlet of the air source heat pump is connected to the inlet of the water source heat pump evaporator through a valve, the air source heat pump is connected to the energy storage water tank through a primary heat circulation water pump, and the outlet of the water source heat pump condenser is connected to the energy storage water tank through a valve.

3. The air-water cascade heat pump heating device for oil field wellhead heating according to claim 1, characterized in that: The water source heat pump condenser inlet is connected to the startup emergency heating device.

4. The air-water cascade heat pump heating device for oilfield wellhead heating according to claim 3, characterized in that: The emergency heating device has an outlet connected to the energy storage water tank and an inlet connected to the outlet of the energy storage circulating water pump.

5. The air-water cascade heat pump heating device for oil field wellhead heating according to claim 1, characterized in that: The energy storage water tank is connected to the process heat exchange device through a pipeline.

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