Anti-blocking heat exchanger for oil field and water source heat pump unit

Abstract

The utility model discloses an anti-blocking heat exchanger and a water source heat pump unit for an oil field, the anti-blocking heat exchanger for the oil field comprises a box body and a heat transfer plate combination body, the heat transfer plate combination body is packaged in the box body, and a flow channel for flowing oily sewage is formed between the box body and the heat transfer plate combination body. An oil-containing sewage inlet and an oil-containing sewage outlet are respectively formed in two ends of the flow channel; the heat transfer plate assembly comprises a plurality of heat transfer plates arranged in parallel and large headers arranged at four corners of the heat transfer plates; the heat transfer plate comprises a vertical pipe body and heat transfer plate cores pressed on the two sides of the vertical pipe body. The vertical pipe body comprises a plurality of heat exchange pipes arranged in parallel and small collecting pipes vertically connected to the two ends of the heat exchange pipes. The anti-blocking heat exchanger for the oil field has the advantages of being efficient in anti-blocking and anti-corrosion and free of cleaning and maintenance. In addition, oil-containing sewage directly exchanges heat with a refrigerant / refrigerant through the anti-blocking heat exchanger for the oil field, the efficiency of a heat supply system is improved, and the requirement for long-term, stable and efficient operation of a water source heat pump unit and the heat supply system of the water source heat pump unit is met.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field equipment, in particular to an anti-blocking heat exchanger and a water source heat pump unit for oil fields. Background Art

[0002] At present, in the oilfield produced water treatment system, 30℃-40℃ oily wastewater is directly injected into the ground, causing a large amount of heat loss. Using water source heat pump units to recover the waste heat of produced water for heating, such as heating and heating oil-containing process media, has high system efficiency and good economy, and its application prospects are promising.

[0003] At present, most water source heat pump units produced by heat pump manufacturers use conventional heat exchangers inside, such as plate exchangers, shell and tube heat exchangers, etc. Because the produced water contains a small amount of oil and other impurities, after entering the heat exchanger inside the heat pump unit, oil stains will form and deposit on the inner wall of the pipe. After about two months of operation, the pipes inside the heat exchanger will be blocked, seriously affecting the heat exchange effect and the efficiency of the water source heat pump. After long-term use, corrosion perforation and pipe leakage problems will also occur.

[0004] The current methods to solve this problem are: 1) regular manual cleaning, online heating or reverse flushing with chemicals to remove dirt. This method greatly increases maintenance costs and also affects normal production. 2) using water pumps and water replenishment devices to form an indirect heat exchange system. This method reduces system efficiency and increases costs. At the same time, the external heat exchanger also needs regular cleaning and maintenance. Therefore, it is necessary to propose an anti-blocking heat exchanger and water source heat pump unit for oil fields to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies of the prior art and propose an anti-blocking heat exchanger and water source heat pump unit for oil fields, which have the characteristics of high efficiency anti-blocking and anti-corrosion, and do not require cleaning and maintenance. In addition, the oily sewage directly exchanges heat with the refrigerant / coolant through the heat exchanger, thereby improving the efficiency of the heating system. The requirements for long-term, stable and efficient operation of the water source heat pump unit and its heating system are met.

[0006] The utility model provides an anti-blocking heat exchanger for oil fields, comprising: a box body and a heat transfer plate assembly, the heat transfer plate assembly is encapsulated in the box body, a flow channel for circulating oily sewage is formed between the box body and the heat transfer plate assembly, and an oily sewage inlet and an oily sewage outlet are respectively arranged at both ends of the flow channel; the heat transfer plate assembly comprises a plurality of heat transfer plates arranged in parallel and large headers arranged at the four corners of the heat transfer plates; the heat transfer plates comprise a tube vertical body and a heat transfer plate core pressed on both sides of the tube vertical body; the tube vertical body comprises a plurality of heat exchange tubes arranged in parallel and small headers vertically connected to both ends of the heat exchange tubes; the large header close to the bottom of the oily sewage outlet is the refrigerant inlet, and the large header close to the top of the oily sewage inlet is the refrigerant outlet; the refrigerant inlet is connected with the small header, the heat exchange tube and the refrigerant inlet.

[0007] Furthermore, the heat transfer plate core is a titanium plate, and a plurality of parallel heat exchange tubes in the tube stand are packaged between two titanium plates to form a bulge structure.

[0008] Furthermore, the small header and the large header are both exposed outside the box body, the diameter of the large header is larger than the diameter of the small header, and the large header is vertically welded to the small header.

[0009] Furthermore, the box body is welded and assembled by steel plates, the oily sewage inlet and the oily sewage outlet at both ends of the box body are centrally symmetrical bell mouths, and the opening of the bell mouth is a square interface; the oily sewage inlet is located above the oily sewage outlet.

[0010] The utility model also provides a water source heat pump unit, comprising: a compressor, a condenser and an expansion valve, and also comprising an anti-blocking type heat exchanger for oil fields, wherein the anti-blocking type heat exchanger for oil fields is the anti-blocking type heat exchanger for oil fields described above; the refrigerant inlet of the anti-blocking type heat exchanger for oil fields is sequentially connected to the expansion valve, the condenser and the compressor, and the compressor is connected to the refrigerant outlet.

[0011] The utility model has the following beneficial effects: the utility model provides an anti-blocking heat exchanger and a water source heat pump unit for oil fields, and the anti-blocking heat exchanger for oil fields has the characteristics of high efficiency anti-blocking and anti-corrosion, and does not require cleaning and maintenance. In addition, the oily sewage directly exchanges heat with the refrigerant / coolant through the anti-blocking heat exchanger for oil fields, which improves the efficiency of the heating system and meets the needs of long-term, stable and efficient operation of the water source heat pump unit and its heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of an anti-blocking heat exchanger for oil fields;

[0014] Figure 2 It is a schematic diagram of the three-dimensional structure of the heat transfer plate assembly;

[0015] Figure 3 Schematic diagram of the three-dimensional structure of the heat transfer plate;

[0016] Figure 4 yes Figure 3 AA direction cross-sectional view;

[0017] Figure 5 yes Figure 3 BB direction cross-sectional view;

[0018] Figure 6 yes Figure 3 CC direction cross-sectional view;

[0019] Figure 7 It is a schematic diagram of the three-dimensional structure of the vertical tube.

[0020] Figure 8 The utility model is a schematic diagram of the structure of an anti-blocking heat exchanger and a water source heat pump unit for oil fields.

[0021] Illustrations: 1-heat exchange tube; 2-small header; 3-tube vertical body; 4-heat transfer plate core; 5-heat transfer plate; 6-large header; 7-heat transfer plate assembly; 8-box; 9-compressor; 10-condenser; 11-anti-blocking heat exchanger for oil field; 12-expansion valve; 13-oil-containing wastewater inlet; 14-oil-containing wastewater outlet; 15-bell mouth; 16-refrigerant inlet; 17-refrigerant outlet. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the art to which the present application belongs.

[0023] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0024] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for clarity, the thickness of the layers and regions is enlarged, and the same reference numerals are used to represent the same devices, so their description will be omitted.

[0025] See also Figures 1 to 7 The utility model provides an anti-blocking heat exchanger for oil fields, which can effectively prevent corrosion and blockage, and does not require cleaning and maintenance. The anti-blocking heat exchanger 11 for oil fields specifically includes a box body 8 and a heat transfer plate assembly 7. The heat transfer plate assembly 7 is encapsulated in the box body 8. The box body 8 is welded and assembled by steel plates. A flow channel for circulating oily sewage is formed between the box body 8 and the heat transfer plate assembly 7. An oily sewage inlet 13 and an oily sewage outlet 14 are respectively provided at both ends of the flow channel.

[0026] Specifically, the heat transfer plate assembly 7 includes a plurality of heat transfer plates 5 arranged in parallel and large headers 6 arranged at the four corners of the heat transfer plates 5; the heat transfer plates 5 include a tube riser 3 and a heat transfer plate core 4 pressed on both sides of the tube riser 3; the tube riser 3 includes a plurality of heat exchange tubes 1 arranged in parallel and small headers 2 vertically connected to both ends of the heat exchange tubes 1, the diameter of the large header 6 is larger than the diameter of the small header 2, and Freon refrigerant flows in the tube riser 3 and the large header 6.

[0027] The large header 6 below the oily wastewater outlet 14 is the refrigerant inlet 16 , and the large header 6 above the oily wastewater inlet 13 is the refrigerant outlet 17 ; the refrigerant inlet 16 is connected to the small header 2 , the heat exchange tube 1 and the refrigerant inlet 16 .

[0028] Preferably, the heat transfer plate core 4 is a titanium plate, and the multiple parallel heat exchange tubes 1 in the tube riser 3 are encapsulated between two titanium plates to form a raised structure. The surface of the heat transfer plate core 4 is polished, the surface is smooth and not easy to deposit dirt, and it is highly anti-corrosive. The heat transfer plate 5 has a regular and orderly raised structure, which can increase the disturbance capacity of the oily wastewater and form turbulence, which can not only enhance the heat exchange, but also can wash away the dirt on the surface of the heat transfer plate due to the disturbance, further reducing the deposition of dirt. The heat exchange tube 1 is not in direct contact with the oily wastewater, avoiding corrosion problems. At the same time, the heat exchange tube material can use pure aluminum tubes instead of titanium tubes, which greatly reduces the material cost. The large header 6 and the small header 2 are aluminum tubes, which reduces the cost.

[0029] A plurality of heat transfer plates 5 are arranged in order, and the small header 2 and the large header 6 are vertically welded and connected to form a heat transfer plate assembly 7. The heat transfer plates 5 are characterized in that the spacing is relatively large, which is 1 / 2 to 1 / 3 of the diameter of the oily sewage pipeline, forming a wide flow channel structure; the oily sewage flows through the wide flow channel and is not easily blocked for long-term use. The heat transfer plate assembly 7 is welded with steel plates and packaged into a box body 8, and the small header 2 and the large header 6 are exposed outside the box body 8 and do not contact the oily sewage, thereby avoiding problems such as corrosion and scaling.

[0030] The oily wastewater inlet 13 and the oily wastewater outlet 14 are centrally symmetrical bell mouths 15, and the opening of the bell mouth 15 is a square interface; the oily wastewater inlet 13 is located above the oily wastewater outlet 14. The oily wastewater inlet 13 and the oily wastewater outlet 14 have a height difference, and the wastewater enters at a high level and exits at a low level, giving full play to the heat exchange capacity of the heat transfer plate. The oily wastewater directly exchanges heat with the refrigerant / coolant through the oilfield anti-blocking heat exchanger 11, avoiding the problems of reduced indirect heat exchange efficiency and increased costs.

[0031] See also Figure 8 The anti-blocking heat exchanger for oil fields of the utility model embodiment, the large header and other components of the water source heat pump are connected through pipelines to form a water source heat pump unit.

[0032] Specifically, the water source heat pump unit includes a compressor 9, a condenser 10, an oilfield anti-blocking heat exchanger 11 and an expansion valve 12. Among them, the refrigerant inlet 16 of the oilfield anti-blocking heat exchanger 11 is connected to the expansion valve 12, the condenser 10 and the compressor 9 in sequence, and the compressor 9 is connected to the refrigerant outlet 17. The condenser 10 is connected to the heating circulation water circuit.

[0033] When the water source heat pump unit is working, the Freon refrigerant generates high-temperature and high-pressure gas under the action of the electric-driven steam compressor, releases heat in the condenser for heating, and then turns into low-temperature and high-pressure liquid refrigerant, and then becomes low-temperature and low-pressure refrigerant through the pressure reduction regulation of the expansion valve. At this time, it enters the anti-blocking heat exchanger through the large header to absorb the heat of the oily sewage. The refrigerant is converted into gas and then enters the compressor for compression. This cycle constitutes the heating system of the water source heat pump unit. The water source heat pump unit absorbs the waste heat of the oily sewage, and the heating capacity is far greater than that of the same power electric heating equipment. It is a high-efficiency and energy-saving new energy equipment. When using the water source heat pump unit to heat the oil-containing process medium, the anti-blocking heat exchanger can also be used as a condenser, and the usage method is the same.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0036] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An anti-blocking heat exchanger for oil fields, characterized in that: include: A box body (8) and a heat transfer plate assembly (7), wherein the heat transfer plate assembly (7) is enclosed in the box body (8), a flow channel for circulating oily wastewater is formed between the box body (8) and the heat transfer plate assembly (7), and an oily wastewater inlet (13) and an oily wastewater outlet (14) are respectively provided at both ends of the flow channel; The heat transfer plate assembly (7) comprises a plurality of heat transfer plates (5) arranged in parallel and large headers (6) arranged at the four corners of the heat transfer plates (5); the heat transfer plates (5) comprise a tube stand (3) and a heat transfer plate core (4) pressed on both sides of the tube stand (3); the tube stand (3) comprises a plurality of heat exchange tubes (1) arranged in parallel and small headers (2) vertically connected to both ends of the heat exchange tubes (1); the large header (6) near the bottom of the oily wastewater outlet (14) is a refrigerant inlet (16), and the large header (6) near the top of the oily wastewater inlet (13) is a refrigerant outlet (17); the refrigerant inlet (16) is connected to the small header (2), the heat exchange tube (1) and the refrigerant inlet (16).

2. The anti-blocking heat exchanger for oil fields according to claim 1, characterized in that: The heat transfer plate core (4) is a titanium plate, and a plurality of parallelly arranged heat exchange tubes (1) in the tube stand (3) are packaged between two titanium plates to form a bulge structure.

3. The anti-blocking heat exchanger for oil fields according to claim 1, characterized in that: The small header (2) and the large header (6) are both exposed outside the box body (8); the diameter of the large header (6) is larger than the diameter of the small header (2); and the large header (6) and the small header (2) are vertically welded.

4. The anti-blocking heat exchanger for oil fields according to claim 1, characterized in that: The box body (8) is welded and assembled by steel plates; the oily sewage inlet (13) and the oily sewage outlet (14) at both ends of the box body (8) are centrally symmetrical bell mouths (15); the opening of the bell mouth (15) is a square interface; the oily sewage inlet (13) is located above the oily sewage outlet (14).

5. A water source heat pump unit, comprising: A compressor (9), a condenser (10) and an expansion valve (12), characterized in that it also includes an anti-blocking type heat exchanger (11) for oil fields, wherein the anti-blocking type heat exchanger (11) for oil fields is the anti-blocking type heat exchanger for oil fields according to any one of claims 1 to 4; The refrigerant inlet (16) of the oilfield anti-blocking heat exchanger (11) is connected to the expansion valve (12), the condenser (10) and the compressor (9) in sequence, and the compressor (9) is connected to the refrigerant outlet (17).

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