A crude oil waste heat recovery device
By designing a crude oil waste heat recovery device during crude oil production, and using a three-phase separation tank and absorption heat pump to recover medium temperature waste heat, the problem of large consumption of fossils or electricity energy is solved, and the efficiency and cost reduction of crude oil heating is achieved.
Patent Information
- Application Number
- CN202011477993.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-12-15
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2040-12-15
AI Technical Summary
In the crude oil production process, fossils or electricity consumption is high, resulting in high energy consumption and high emissions.
A crude oil waste heat recovery device is designed, including a three-phase separation tank and an absorption heat pump. By separating the oil-water mixture and using a gas-driven absorption heat pump, the sensible heat of the sewage is used for heating medium, thereby heating the crude oil to achieve medium temperature waste heat. recycling and utilization.
It effectively reduces energy consumption in crude oil production, improves energy utilization, and greatly reduces production costs.
Smart Images
Figure CN112432385B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of crude oil production, and in particular to a crude oil waste heat recovery device. Background Art
[0002] my country is a country with relatively rich oil and gas resources. There are five major oilfield areas on land, namely Northeast China, North China, Northwest China, Southwest China and Central China, and three major oilfield areas at sea, namely Bohai Sea, East China Sea and South China Sea. In the process of producing crude oil from oilfields, a large amount of fossil or electric energy is consumed to control the temperature of crude oil to meet the prescribed standards. At the same time, a large amount of medium-temperature sewage is generated during the mining process, resulting in high energy consumption and high emissions in oilfield mining. Therefore, it is urgent to reduce energy consumption in the process of oilfield mining. Summary of the invention
[0003] The purpose of the present invention is to provide a crude oil waste heat recovery device to solve the problems existing in the above-mentioned prior art. It can not only replace fossil or electric energy to heat crude oil, but also utilize a large amount of waste heat resources, improve energy utilization, and significantly reduce production costs.
[0004] To achieve the above object, the present invention provides the following solutions:
[0005] The present invention provides a crude oil waste heat recovery device, comprising a three-phase separation tank, an absorption heat pump and at least one group of separation structures, each group of the separation structures comprises a heat exchanger and a separation tank, the three-phase separation tank is used to separate an oil-water mixture, the crude oil obtained after the oil-water mixture is separated by the three-phase separation tank enters the heat exchanger and the separation tank in sequence, the sewage and gas obtained after the oil-water mixture is separated by the three-phase separation tank enter the absorption heat pump through pipelines respectively, the gas is used as a driving heat source to drive the absorption heat pump to do work, and the heat exchangers of each group are connected to the absorption heat pump through pipelines.
[0006] Preferably, the absorption heat pump includes a condenser, a generator, an absorber and an evaporator, the gas outlet of the three-phase separation tank is connected to the gas inlet of the generator through a pipeline, the sewage outlet of the three-phase separation tank is connected to the sewage inlet of the evaporator through a pipeline, the sewage outlet of the evaporator is connected to the sewage discharge device through a pipeline, and the circulating heating medium circulates in the absorber, the condenser and the heat exchanger in turn.
[0007] Preferably, the temperature of the circulating heating medium is 40-50°C.
[0008] Preferably, there are at least two groups of separation structures, and the heat exchangers in the separation structures of each group are arranged at the front end of the separation tank of the same group. The crude oil obtained after the oil-water mixture is separated by the three-phase separation tank flows through the heat exchangers and the separation tank of each group in turn, and the circulating heating medium circulates in the absorber, the condenser and the heat exchangers of each group in turn.
[0009] Preferably, a sewage buffer tank is provided on the pipeline between the sewage outlet of the three-phase separation tank and the sewage inlet of the evaporator, and the sewage outlet of each separation tank is connected to the sewage buffer tank.
[0010] Preferably, a sewage pump is provided on the pipeline between the sewage buffer tank and the sewage inlet of the evaporator.
[0011] Preferably, it also includes a third heat exchanger and a crude oil buffer tank, the crude oil inlet of the third heat exchanger is connected to the crude oil outlet of the last separation tank, the crude oil outlet of the third heat exchanger is connected to the crude oil inlet of the crude oil buffer tank, and the circulating heating medium circulates in the absorber, the condenser and the third heat exchanger in sequence.
[0012] Preferably, the crude oil outlet of the crude oil buffer tank is provided with a crude oil pump.
[0013] Preferably, the condenser includes an upper condenser and a lower condenser, the circulating heating medium outlet in the upper condenser is connected to the circulating heating medium inlet in the frontmost heat exchanger input end, and the circulating heating medium inlet in the lower condenser is connected in parallel with the circulating heating medium inlets in the remaining heat exchanger input ends and the third heat exchanger input end.
[0014] Preferably, the absorber includes an upper absorber and a lower absorber, the circulating heating medium outlet in the upper absorber is connected to the circulating heating medium inlet in the lower condenser, the circulating heating medium inlet in the upper absorber is connected in parallel with the circulating heating medium outlets in the remaining heat exchangers and the third heat exchanger input end, respectively, the circulating heating medium outlet in the lower absorber is connected to the circulating heating medium inlet in the upper condenser, and the circulating heating medium inlet in the lower absorber is connected to the circulating heating medium outlet in the frontmost heat exchanger input end.
[0015] Compared with the prior art, the present invention has achieved the following technical effects:
[0016] In the present invention, the oil-water mixture is separated into crude oil, sewage and gas by a three-phase separation tank. The crude oil is first passed into a heat exchanger for heating before being passed into the separation tank for further separation. The gas is used as a driving heat source to drive the absorption heat pump to do work. The absorption heat pump passes sewage to absorb the sensible heat of the sewage and thereby increase the temperature of the circulating heating medium in the absorption heat pump. Then the heat exchanger absorbs the heat of the circulating heating medium to heat the crude oil to reach its process processing temperature. Not only can a large amount of medium-temperature waste heat resources be recovered, but also the crude oil processing process can be reduced, which greatly reduces energy consumption, improves energy utilization, and reduces production costs in the crude oil production industry. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 This is a schematic diagram of a crude oil waste heat recovery device according to the present invention;
[0019] Among them: 100-crude oil waste heat recovery device, 1-three-phase separation tank, 2-first heat exchanger, 3-primary separation tank, 4-second heat exchanger, 5-secondary separation tank, 6-third heat exchanger, 7-crude oil buffer tank, 8-crude oil pump, 9-sewage pump, 10-sewage buffer tank, 11-generator, 12-condenser, 13-absorber, 14-evaporator, 15-absorption heat pump. DETAILED DESCRIPTION
[0020] 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.
[0021] The purpose of the present invention is to provide a crude oil waste heat recovery device to solve the problems existing in the above-mentioned prior art. It can not only replace fossil or electric energy to heat crude oil, but also utilize a large amount of waste heat resources, improve energy utilization, and significantly reduce production costs.
[0022] 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.
[0023] like Figure 1 As shown: This embodiment provides a crude oil waste heat recovery device 100, including a three-phase separation tank 1, an absorption heat pump 15 and at least one group of separation structures, each group of separation structures includes a heat exchanger and a separation tank, the heat exchanger is used to heat the crude oil to a set temperature, the separation tank is used to remove water from the crude oil to the transportation standard of the crude oil, the three-phase separation tank 1 is used to separate the oil-water mixture, the crude oil obtained after the oil-water mixture is separated by the three-phase separation tank 1 enters the heat exchanger and the separation tank in sequence through the crude oil outlet of the three-phase separation tank 1, the sewage and gas obtained after the oil-water mixture is separated by the three-phase separation tank 1 enter the absorption heat pump 15 through pipelines respectively, the gas is used as a driving heat source to drive the absorption heat pump 15 to do work, and the heat exchangers of each group are connected to the absorption heat pump 15 through pipelines. In this embodiment, the oil-water mixture is separated into crude oil, sewage and gas through the three-phase separation tank 1. The crude oil is first passed into the heat exchanger for heating before being passed into the separation tank for further separation. The gas is used as a driving heat source to drive the absorption heat pump 15 to do work. The absorption heat pump 15 passes sewage to absorb the sensible heat of the sewage and thereby increase the temperature of the circulating heating medium in the absorption heat pump 15. Then, the heat exchanger absorbs the heat of the circulating heating medium to heat the crude oil to reach its process processing temperature. This can not only recover a large amount of medium-temperature waste heat resources, but also complete the reduction of crude oil processing process, greatly reduce energy consumption, improve energy utilization, and reduce production costs in the crude oil production industry.
[0024] Specifically, in this embodiment, the absorption heat pump 15 includes a condenser 12, a generator 11, an absorber 13 and an evaporator 14. The gas outlet of the three-phase separation tank 1 is connected to the gas inlet of the generator 11 through a pipeline. The generator 11 also includes a combustion chamber and a smoke exhaust device. Gas is introduced into the combustion chamber and combustion occurs to heat the lithium bromide solution. The smoke exhaust device is used to purify the exhausted flue gas. The sewage outlet of the three-phase separation tank 1 is connected to the sewage inlet of the evaporator 14 through a pipeline. The sewage outlet of the evaporator 14 is connected to the sewage discharge device through a pipeline. Sewage is introduced into the evaporator 14 to absorb the sensible heat of the sewage and thereby increase the temperature of the circulating heating medium in the absorption heat pump 15. The circulating heating medium circulates in the absorber 13, the condenser 12 and the heat exchanger in turn.
[0025] In this embodiment, the temperature of the circulating heating medium is 40-50°C.
[0026] In this embodiment, there are at least two groups of separation structures, and the heat exchangers in the separation structures of each group are arranged at the front end of the separation tank of the same group. The crude oil obtained after the oil-water mixture is separated by the three-phase separation tank 1 flows through the heat exchangers and separation tanks of each group in turn, and the circulating heating medium circulates in the absorber 13, the condenser 12 and the heat exchangers of each group in turn. Specifically, the circulating heating medium inlet of the absorber 13 is connected to the circulating heating medium outlet of the heat exchanger through a pipeline, the circulating heating medium outlet of the absorber 13 is connected to the circulating heating medium inlet of the condenser 12 through a pipeline, and the circulating heating medium outlet of the condenser 12 is connected to the circulating heating medium inlet of the heat exchanger through a pipeline.
[0027] The separation structure in this embodiment is divided into two groups, and the heat exchangers in the two groups of separation structures are respectively the first heat exchanger 2 and the second heat exchanger 4, and the separation tanks in the two groups of separation structures are respectively the primary separation tank 3 and the secondary separation tank 5. The crude oil obtained after the oil-water mixture is separated by the three-phase separation tank 1 flows through the first heat exchanger 2, the primary separation tank 3, the second heat exchanger 4 and the secondary separation tank 5 in sequence, and the circulating heating medium circulates in the absorber 13, the condenser 12 and the first heat exchanger 2 in sequence, and the circulating heating medium circulates in the absorber 13, the condenser 12 and the second heat exchanger 4 in sequence.
[0028] In this embodiment, a sewage buffer tank 10 is provided on the pipeline between the sewage outlet of the three-phase separation tank 1 and the sewage inlet of the evaporator 14. The sewage buffer tank 10 is used to store sewage, and the sewage outlets of each separation tank are connected to the sewage buffer tank 10 to replenish the sewage in the sewage buffer tank 10. A sewage pump 9 is provided on the pipeline between the sewage buffer tank 10 and the sewage inlet of the evaporator 14.
[0029] In this embodiment, a third heat exchanger 6 and a crude oil buffer tank 7 are also included. The crude oil outlet of the crude oil buffer tank 7 is provided with a crude oil pump 8, which is connected to the outside through the crude oil pump 8 for exporting crude oil to the outside. The crude oil inlet of the third heat exchanger 6 is connected to the crude oil outlet of the last separation tank, and the crude oil outlet of the third heat exchanger 6 is connected to the crude oil inlet of the crude oil buffer tank 7. The circulating heating medium circulates in the absorber 13, the condenser 12 and the third heat exchanger 6 in sequence. The third heat exchanger 6 is used to heat the crude oil to a set temperature to meet the conditions for crude oil transportation. The crude oil buffer tank 7 is used for safe storage of crude oil.
[0030] In this embodiment, the condenser 12 includes an upper condenser and a lower condenser. The circulating heating medium outlet in the upper condenser is connected to the circulating heating medium inlet in the input end of the first heat exchanger 2, and the circulating heating medium in the lower condenser is connected in parallel with the circulating heating medium inlets in the input ends of the second heat exchanger 4 and the third heat exchanger 6.
[0031] In this embodiment, the absorber 13 includes an upper absorber and a lower absorber, the circulating heating medium outlet in the upper absorber is connected to the circulating heating medium inlet in the lower condenser, the circulating heating medium inlet in the upper absorber is connected in parallel with the circulating heating medium outlets in the input ends of the second heat exchanger 4 and the third heat exchanger 6, respectively, the circulating heating medium outlet in the lower absorber is connected to the circulating heating medium inlet in the upper condenser, and the circulating heating medium inlet in the lower absorber is connected to the circulating heating medium outlet in the input end of the first heat exchanger 2.
[0032] The present embodiment provides a crude oil waste heat recovery device 100, in which the evaporator 14 absorbs the sensible heat of the sewage in the sewage buffer tank 10 to increase the temperature of the circulating heating medium in the absorption heat pump 15, and the circulating heating medium with increased temperature flows into the first heat exchanger 2, the second heat exchanger 4 and the third heat exchanger 6 and heats the crude oil in the first heat exchanger 2, the second heat exchanger 4 and the third heat exchanger 6 to meet the production process requirements. The circulating heating medium after heat exchange flows back to the absorber 13 to complete the heating cycle, and at the same time, the gas separated by the three-phase separation tank 1 is used as the driving heat source of the absorption heat pump 15, and the sewage separated by the primary separation tank 3 and the secondary separation tank 5 is used as a supplement to the sewage buffer tank 10, thereby finally achieving the effect of reducing the crude oil heating cost and improving the energy utilization rate.
[0033] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A crude oil waste heat recovery device, characterized in that: It comprises a three-phase separation tank, an absorption heat pump and at least one group of separation structures, each group of the separation structures comprises a heat exchanger and a separation tank, the three-phase separation tank is used to separate the oil-water mixture, the crude oil obtained after the oil-water mixture is separated by the three-phase separation tank enters the heat exchanger and the separation tank in sequence, the sewage and the gas obtained after the oil-water mixture is separated by the three-phase separation tank enter the absorption heat pump through pipelines respectively, the gas is used as a driving heat source to drive the absorption heat pump to do work, and the heat exchanger of each group is connected to the absorption heat pump through pipelines; The absorption heat pump comprises a condenser, a generator, an absorber and an evaporator, the gas outlet of the three-phase separation tank is connected to the gas inlet of the generator through a pipeline, the sewage outlet of the three-phase separation tank is connected to the sewage inlet of the evaporator through a pipeline, the sewage outlet of the evaporator is connected to the sewage discharge device through a pipeline, and the circulating heating medium circulates in the absorber, the condenser and the heat exchanger in sequence; It also includes a third heat exchanger and a crude oil buffer tank, wherein the crude oil inlet of the third heat exchanger is connected to the crude oil outlet of the last separation tank, and the crude oil outlet of the third heat exchanger is connected to the crude oil inlet of the crude oil buffer tank, and the circulating heating medium circulates in the absorber, the condenser and the third heat exchanger in sequence; The condenser includes an upper condenser and a lower condenser, wherein the circulating heating medium outlet in the upper condenser is connected to the circulating heating medium inlet in the frontmost heat exchanger input end, and the circulating heating medium inlet in the lower condenser is connected in parallel with the circulating heating medium inlets in the remaining heat exchanger input ends and the third heat exchanger input end.
2. The crude oil waste heat recovery device according to claim 1, characterized in that: The temperature of the circulating heating medium is 40-50°C.
3. The crude oil waste heat recovery device according to claim 1, characterized in that: There are at least two groups of separation structures, and the heat exchangers in the separation structures of each group are arranged at the front end of the separation tank of the same group. The crude oil obtained after the oil-water mixture is separated by the three-phase separation tank flows through the heat exchangers and the separation tank of each group in turn, and the circulating heating medium circulates in the absorber, the condenser and the heat exchangers of each group in turn.
4. The crude oil waste heat recovery device according to claim 1, characterized in that: A sewage buffer tank is arranged on the pipeline between the sewage outlet of the three-phase separation tank and the sewage inlet of the evaporator, and the sewage outlet of each separation tank is connected to the sewage buffer tank.
5. The crude oil waste heat recovery device according to claim 4, characterized in that: A sewage pump is arranged on the pipeline between the sewage buffer tank and the sewage inlet of the evaporator.
6. The crude oil waste heat recovery device according to claim 1, characterized in that: The crude oil outlet of the crude oil buffer tank is provided with a crude oil pump.
7. The crude oil waste heat recovery device according to claim 1, characterized in that: The absorber includes an upper absorber and a lower absorber, the circulating heating medium outlet in the upper absorber is connected to the circulating heating medium inlet in the lower condenser, the circulating heating medium inlet in the upper absorber is connected in parallel with the circulating heating medium outlets in the remaining heat exchangers and the third heat exchanger input end, respectively, the circulating heating medium outlet in the lower absorber is connected to the circulating heating medium inlet in the upper condenser, and the circulating heating medium inlet in the lower absorber is connected to the circulating heating medium outlet in the frontmost heat exchanger input end.