CN201462405U - Solar energy combined with heat pump heating and transporting crude oil system - Google Patents

Abstract

The utility model discloses a solar energy combined heat pump heating and transporting crude oil system, which comprises a solar heat collecting device, a small heat storage tank, a large heat storage tank and an intermediate heat exchanger, and is characterized in that the crude oil input end of the intermediate heat exchanger The crude oil output port is connected to the crude oil input pipeline respectively, and a heat pump heating system is connected to the large water storage tank. The heat pump heating system is formed by connecting the two ends of the evaporator to the condenser through a compressor and a throttle valve respectively. The condenser is connected to a large heat storage tank. The utility model utilizes the combined sun heat pump system to replace natural gas to heat and transport crude oil, which can save a lot of energy consumption, reduce environmental pollution and purify the environment. The whole system has the advantages of reasonable structure and convenient use.

Description

Solar energy combined with heat pump heating and transporting crude oil system

technical field

The invention relates to a crude oil delivery system using solar energy as a clean energy source combined with heat pump heating, and belongs to the technical field of crude oil heating.

Background technique

Crude oil in my country generally has a high freezing point, high viscosity, and poor fluidity at room temperature. Therefore, after the crude oil is collected from each single well to the ground metering station, it is often necessary to heat the crude oil to 50°C to 60°C during the transportation process to the subsequent stations. ℃, in order to maintain its good fluidity. Therefore, crude oil heating needs to consume a large amount of conventional energy: use burning coal, oil, natural gas and electric heating methods to realize crude oil heating. However, this heating method not only has a low energy utilization rate of the crude oil transportation system, but also has poor energy utilization, resulting in the consumption and waste of fossil energy, and also causes serious environmental pollution problems.

In order to solve the above problems, it has become a research hotspot in recent years to find an energy-saving and clean heating method to replace the conventional crude oil heating and transportation method. The patent with the publication number CN1654879 discloses a solar indirect heating delivery system including a solar heat collection device, a small water storage tank, an intermediate heat exchanger and a heating furnace, which uses solar energy to partially replace conventional energy to heat and transport crude oil, saving energy consumption , Play the role of reducing environmental pollution and purifying the environment.

However, the existing technology can only use solar energy to replace part of the natural gas energy to achieve the purpose of reducing natural gas consumption in the process of indirectly heating and transporting crude oil, and cannot completely replace the natural gas energy consumption. On this basis, the utility model adds a heat pump and an electric heater, removes the heating furnace, and makes it a solar energy combined heat pump heating and transporting crude oil system, thereby replacing the heating method of burning natural gas, and realizing stable operation around the clock. Heat pump technology is an energy-saving technology with high efficiency and environmental protection. Its most notable advantage is energy saving, compared with pure resistance heating system, it can save about 70% of electricity. A heat pump is an energy-saving device that uses high-level energy to make heat flow from a low-level heat source to a high-level heat source. Although the heat pump needs to consume a certain amount of high-level energy, the heat it supplies is the sum of the high-level heat energy consumed and the low-level heat energy absorbed (refer to Chen Dong, Xie Jihong. Heat pump technology and its application [M]. Beijing: Chemical Industry Publishing Society, 2006.45-184), that is, the heat pump system can transfer 3 to 6 times the heat energy it consumes from a low-temperature heat source to a high-temperature heat source. Compared with the original technology, the improved system has a wider range of application and higher efficiency in industrial and civil applications, especially in the field of crude oil heating and transportation in oil field enterprises, and has wider prospects for promotion and development.

Contents of the invention

The utility model adopts the heating method of solar energy combined with heat pump to replace the heating method of burning natural gas, so as to achieve the purpose of replacing natural gas in the process of heating and transporting crude oil. The application of this technology is both energy-saving and environmentally friendly, and has great economic and social significance.

The utility model is achieved through the following technical solutions:

A solar combined heat pump heating and transporting crude oil system, the system includes a solar heat collector 36, a small hot water storage tank 16, a large hot water storage tank 17, an intermediate heat exchanger 12, and the hot water input end of the intermediate heat exchanger 12 25 is connected to the hot water output end 31 of the small heat storage tank through pipelines, and the hot water output end 26 of the intermediate heat exchanger is respectively connected to the input end 27 of the solar heat collector and a hot water input end 35 of the small heat storage tank, The output end 28 of the solar heat collector is connected to another hot water input end 30 of the small heat storage tank, and the other output end 32 of the small heat storage tank is connected to the input end 33 of the large heat storage tank, and the large heat storage tank The output end 34 of the small heat storage tank is connected to the output end 29 of the small water storage tank; it is characterized in that the crude oil input end 23 and the crude oil output end 24 of the intermediate heat exchanger are respectively connected with the crude oil input pipeline, and a heat pump heating system 18 is connected to the large storage tank. On the hot water tank 17, the heat pump heating system 18 is formed by connecting the two ends of the evaporator 20 to the condenser 22 through the compressor 19 and the throttle valve 21 respectively, and the condenser 22 is connected to the large heat storage tank 17.

In the above technical solution, an electric heater 13 can be set in the small heat storage tank 16 .

In the above technical solution, the solar heat collecting device 36 is a solar heat collector array.

Beneficial effect

The utility model has the following advantages:

1. This utility model combines heat pump technology with solar energy heating and transporting crude oil system. The designed heat pump system adopts high-efficiency evaporator, which can effectively use low-temperature heat source and improve system efficiency. The system uses high-temperature environment-friendly working fluid to increase the output temperature of the heat pump without polluting the environment.

2. The utility model adopts a large-area solar collector array, and uses a large-area solar collector array and a heat pump to supply heat to generate heat medium water, and the heat medium water indirectly heats crude oil in the crude oil heater. At the same time, according to the influence of different collector efficiencies and solar radiation intensity and other parameters, the collector area required for heating crude oil can be obtained through thermodynamics and heat transfer calculations, and the water temperature at the inlet and outlet of the collector can be calculated at a certain flow rate. Changes, through the hydrodynamic calculation of the flowing water in the collector, the series and parallel optimal combination distribution of the large-area collector square array is obtained.

3. The utility model adopts the comprehensive optimization technology of the heat exchange network of the system, and the solar collector array, heat pump, crude oil heater array, large and small heat storage tanks in the system are optimally combined and arranged, and the small heat storage tank is used Due to the rapid start-up of the system, the large hot water storage tank is used to store the excess heat of the system, prolong the heating time of the system, fully reflect the respective functions and advantages of different equipment, and complement each other during operation, so that the entire system can achieve the best efficiency state.

Description of drawings

Fig. 1 is a flow chart of the crude oil heating and transporting system of the utility model combined with a solar energy heat pump.

Among them, 1～11: automatic control valve, 12: heat exchanger, 13: electric heater, 14, 15: circulation pump, 16: small heat storage tank, 17: large heat storage tank, 18: heat pump heating system , 19: Compressor, 20: Evaporator, 21: Throttle valve, 22: Condenser, 23, 24: Crude oil input and output of intermediate heat exchanger, 25, 26: Hot water input of intermediate heat exchanger Terminal, output terminal, 27, 28: input terminal and output terminal of solar thermal collector, 31, 32: output terminal of small heat storage tank, 29, 30, 35: input terminal of small heat storage tank, 33, 34: The input end and output end of the large hot water storage tank.

Detailed ways

In conjunction with the flow chart of accompanying drawing 1, illustrate the working principle of the utility model, the utility model is further elaborated.

Connect the solar combined heat pump heating and transporting crude oil system as shown in Figure 1. Under normal solar radiation conditions, the heat pump system 18 is not started, and the circulation pump 14 is turned on, and the hot water in the small heat storage tank 16 is passed through the automatic control valves 5 and 3. Enter the heat exchanger 12, and exchange heat with crude oil in the heat exchanger 12. At this time, the valves 4 and 6 are closed. After the hot water entering the heat exchanger exchanges heat with the crude oil, it enters the solar heat collection device 36 through the automatic control valve 8 That is, the solar heat collector array, after being heated by the heat collector, enters the small heat storage tank 16 through the automatic control valve 9, and the valve 7 is closed at this time. When the temperature of the small heat storage tank 16 is found to be high, there is To store excess heat, the circulation pump 15 is automatically turned on, and hot water enters the large heat storage tank 17 through the automatic control valve 11 for heat storage, and then passes through the automatic control valve 10 to return to the small heat storage tank, and is transferred to the small heat storage tank 16. The output end 31 is sent to the intermediate heat exchanger 12. When the temperature in the solar collector array is low and the water temperature cannot be increased, the hot water passes through the automatic control valve 7 to return to the small heat storage tank after the heat exchange between the heat exchanger 12 and the crude oil 16. At this time, the automatic control valve 8 is closed, and the large heat storage tank 17 supplies heat to the small heat storage tank.

When encountering cloudy days, rainy days and other weather with little sunlight, or when hot water needs to be produced under the condition of no sunlight at night, the heat pump system 18 is turned on. Before starting the heat pump system 18, close the valves 8 and 9, start the circulation pump 15 first, start the heat pump system 18 after the circulation pump runs for 2 minutes, the working fluid enters the evaporator 20 after being depressurized by the throttle valve 21, and absorbs the surrounding environment ( Air, groundwater, geothermal, etc.) are evaporated by low-grade heat. The working fluid vapor flowing out of the evaporator is sucked by the compressor 19 and compressed into a high temperature and high pressure working fluid vapor. Then, the high-temperature and high-pressure working medium steam enters the coil of the condenser 22, and the water in the large heat storage tank 17 is heated by the condensation heat of the working medium steam to increase the temperature of the water. The condensed working fluid passes through the dry filter, throttle valve 21 and other components, and then enters the evaporator 20 to absorb heat and evaporate again, thus completing a complete cycle. Hot water is produced by circulation of working fluid. The prepared hot water is stored in the large heat storage tank 17, and through the automatic control valve 10, the input end 29 of the small heat storage tank returns to the small heat storage tank 16, and is sent to the intermediate heat exchanger 12 through the output end 31. When the valve 7 is opened, if it is found that the temperature of the small heat storage tank is lower, the electric heater 13 is opened.

When encountering the weather with insufficient sunlight, the solar combined heat pump heating system is used. That is: the water stored in the small heat storage tank 16 is heated by the solar heat collector array, and then reheated by the heat pump system through the valve 11 to the large heat storage tank 17 through the circulation pump 15 .

In order to ensure the stability of the system operation, so that the temperature of the hot water at the inlet of the heat exchanger is not directly affected by the instantaneous change of solar radiation or the heating efficiency of the heat pump, the hot water at the outlet end 28 of the solar collector array first enters the small heat storage The water tank 16 and the heat pump heat the water in the large heat storage tank 17, and then enter the intermediate heat exchanger 12 from the small heat storage tank. The system of the present invention is provided with two large and small heat storage tanks. The small hot water storage tank 16 and the electric heater 13 are mainly used to ensure the quick start of the system, so that the temperature of the hot water heated by the heat collector reaches the required operating temperature of the intermediate heat exchanger 12 as soon as possible. The large heat storage tank 17 is used to store excess heat energy, and temporarily unusable energy is stored in the form of hot water when the solar radiation energy peak or heat pump system 18 heating efficiency is high, in case the solar radiation is insufficient or the heat pump system supplies heat. Used when thermal efficiency is low.

Claims (3)

1. A solar combined heat pump heating and transporting crude oil system, said system comprising a solar collector (36), a small heat storage tank (16), a large heat storage tank (17), an intermediate heat exchanger (12), The hot water input end (25) of the intermediate heat exchanger (12) is connected to the hot water output end (31) of the small heat storage tank through a pipeline, and the hot water output end (26) of the intermediate heat exchanger is respectively connected to the solar heat collecting device input end (27) and a hot water input end (35) of the small heat storage tank, the output end (28) of the solar heat collector is connected to another hot water input end (30) of the small heat storage tank, and the small heat storage tank Another output end (32) of the heat storage tank is connected to the input end (33) of the large heat storage tank, and the output end (34) of the large heat storage tank is connected to the output end (29) of the small heat storage tank; It is characterized in that the crude oil input end (23) and the crude oil output end (24) of the intermediate heat exchanger are respectively connected with the crude oil input pipeline, and a heat pump heating system (18) is connected to the large heat storage tank (17), and the The heat pump heating system (18) is formed by connecting the two ends of the evaporator (20) to the condenser (22) respectively through the compressor (19) and the throttle valve (21), and the condenser (22) is connected to the large heat storage tank ( 17) Connected. 2. The solar combined heat pump heating and transporting crude oil system according to claim 1, characterized in that an electric heater (13) is arranged in the small heat storage tank (16). 3. The system for heating and transporting crude oil with combined solar heat pump as claimed in claim 1, characterized in that, the solar heat collecting device (36) is a solar heat collector array.

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