A heat pump rectification system warm pump

Abstract

The utility model relates to a chemical equipment technical field especially relates to a kind of warm pump of heat pump rectification system, and the warm pump includes heat pump unit, rectifying column, air cooler and reflux tank, rectifying column top is communicated with first conveying pipe, first conveying pipe bottom is connected third conveying pipe by valve, third conveying pipe connects air cooler, air cooler connects reflux tank, the shunt of first conveying pipe side wall connects second conveying pipe, second conveying pipe connects heat pump unit, heat pump unit connects reflux tank, and filter assembly is installed on second conveying pipe.The utility model utilizes rectifying column hot material shunt to preheat heat pump unit, simultaneously, filter assembly utilizes fluid impact runner, runner drives filter screen rotation, realizes the online self-cleaning and centrifugal separation of impurity, prevents filter screen blockage and heat pump unit damage, and structure is simple and need not additional power.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a heat pump distillation system warm-up pump. Background Technology

[0002] Heat pump distillation technology, as a highly efficient and energy-saving separation technology, has wide applications in chemical, petroleum, and pharmaceutical manufacturing industries. The heat pump unit, as the core power component of this system, contains precision mechanical structures such as compressors and has strict requirements for its operating environment. During the restart phase after a long period of system shutdown, to prevent damage to the equipment caused by excessively high lubricating oil viscosity, improper mechanical clearances, or liquid slugging due to low-temperature cold starts, a warm-up operation is usually required. This involves pre-flowing a fluid of a certain temperature through the heat pump unit to slowly raise its temperature to a suitable operating state.

[0003] In practical engineering applications, to save energy and reduce costs, it is often preferable to directly use the high-temperature process materials generated by the distillation column as a heat source to preheat the heat pump unit. However, the hot material flowing out of the distillation column inevitably carries some particulate impurities due to pipe corrosion, catalyst residue, or material crystallization. If these impurities directly enter the heat pump unit with the fluid, they can easily scratch precision moving parts or block internal flow channels, posing a serious threat to equipment safety.

[0004] Therefore, installing a filter in the warm-up pump pipeline is particularly necessary. However, most existing pipeline filters use static interception filters. During the warm-up process, as the fluid containing impurities continues to flow, impurities easily and quickly adhere to and accumulate on the filter surface, causing blockage of the filter pores. This not only causes a sharp increase in pressure loss within the pipeline, significantly reducing the flow rate and velocity of the warm-up fluid, leading to low warm-up efficiency, but may even interrupt the warm-up process due to blockage. To solve the blockage problem, frequent shutdowns for manual disassembly and cleaning are usually required, which greatly increases maintenance costs and operational complexity. If existing electric self-cleaning filters are used, additional motors, control circuits, and power sources are needed, which would result in an overly complex system structure and excessively high construction costs for warm-up pump branches mainly used during the startup phase.

[0005] Therefore, this utility model proposes a heat pump distillation system warm-up pump to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a heat pump distillation system warm-up pump, which aims to improve the problems of easy clogging of filter devices in the warm-up pump pipeline, the need for shutdown maintenance, high maintenance costs, or complex self-cleaning structure, dependence on additional power source, and high cost in the existing technology.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a heat pump distillation system for warming up the pump, including a heat pump unit; and a distillation column, the distillation column being located behind the heat pump unit; further including an air cooler, a reflux tank, a first delivery pipe, a valve, a second delivery pipe, a third delivery pipe, a first connecting pipe, a second connecting pipe, and a filter assembly;

[0008] The outlet end of the top of the distillation column is connected to the input end of the first conveying pipe. A valve is installed at the bottom of the first conveying pipe, and the bottom outlet of the valve is connected to the input end of the third conveying pipe. The output end of the third conveying pipe is connected to the input end of the air cooler. The output end of the bottom of the air cooler is connected to the input end of the reflux tank through the second connecting pipe. A branch port is opened on the side wall of the first conveying pipe, and the branch port is connected to the input end of the second conveying pipe. The output end of the second conveying pipe is connected to the input end of the heat pump unit. The output end of the bottom of the heat pump unit is connected to the other input end of the reflux tank through the first connecting pipe.

[0009] A filter assembly is installed in the middle section of the second conveying pipe. The filter assembly includes a filter tube connected in series in the second conveying pipe. A filter screen is provided in the inner cavity of the filter tube. A rotating wheel is provided on the rear side of the filter screen. A transmission column is fixedly connected to the central shaft of the rotating wheel. The front end of the transmission column is fixedly connected to the center of the filter screen. A positioning ring is fixedly sleeved on the outer edge of the filter screen. An annular groove is opened on the inner wall of the filter tube. The positioning ring is rotatably fitted in the annular groove. A fixing frame is fixedly connected to the bottom of the inner wall of the filter tube. The bottom shaft of the rotating wheel is rotatably mounted on the fixing frame.

[0010] Preferably, a plurality of arc-shaped blades are fixedly provided on the outer surface of the rotor, the plurality of arc-shaped blades are inclinedly distributed along the circumference of the rotor, and the force-bearing concave surface of the arc-shaped blades faces the liquid outlet side of the filter screen.

[0011] Preferably, the fixing frame is an inverted T-shaped bracket structure, the bottom end of the fixing frame is welded to the lower surface of the inner wall of the filter tube, and a bearing seat is provided at the top center of the fixing frame. The bottom shaft of the rotating wheel is rotatably inserted into the bearing seat through the bearing.

[0012] Preferably, the valve’s input end is sealed and fixedly connected to the bottom end of the first delivery pipe, and the valve’s output end is sealed and fixedly connected to the input end of the third delivery pipe by a flange.

[0013] Preferably, the connection point between the first delivery pipe and the second delivery pipe is located above the valve, and the installation height of the first delivery pipe is set to be higher than the horizontal height of the inlet of the second delivery pipe;

[0014] Preferably, the air cooler is provided with a heat exchange tube bundle inside, and the two ends of the heat exchange tube bundle are respectively connected to the input end and the output end of the air cooler. The air cooler is provided with a fan assembly outside.

[0015] Preferably, a pressure gauge interface is provided at the top of the reflux tank, a pressure monitoring instrument is installed at the pressure gauge interface, and a reflux pump interface is provided at the bottom of the reflux tank.

[0016] Preferably, a drain outlet is provided on the bottom wall of the filter tube, the drain outlet is located below the front side of the filter screen, and a drain control valve is installed at the drain outlet.

[0017] This utility model has the following beneficial effects:

[0018] 1. This utility model constructs a diversion pipeline by setting up a first delivery pipe, a second delivery pipe, a third delivery pipe, and valves. Part of the hot material at the top of the distillation column is introduced into the heat pump unit, and the other part is sent to the reflux tank after being cooled by the air cooler. This solves the problems of high energy consumption during cold start, high preheating cost, and susceptibility to low-temperature shock damage in the existing technology of heat pump units. It achieves the effect of using the waste heat of the process itself to efficiently warm up the heat pump unit, significantly reducing start-up costs and improving operational stability.

[0019] 2. This utility model solves the problems of easy clogging of filters and the need for manual maintenance in the second delivery pipe entering the heat pump unit, or the reliance on external power and complex structure of self-cleaning devices in the prior art. It achieves online self-cleaning without additional power, has a simple and reliable structure, and effectively protects the heat pump unit.

[0020] 3. This utility model solves the problem in existing self-cleaning structures where impurities remain in the cavity after being thrown off, easily causing secondary accumulation and blockage, by opening a drain port at the bottom of the filter tube of the filter component and using a rotating filter screen to collect the thrown-off impurities. It achieves the effect of timely discharge of impurities out of the system, ensuring the long-term cleaning ability of the filter component and the continuous unobstructed flow of the entire pipeline. Attached Figure Description

[0021] Figure 1 A perspective view of a heat pump distillation system warm-up pump proposed in this utility model;

[0022] Figure 2 A schematic diagram of a reflux tank for warming up a heat pump distillation system according to this utility model;

[0023] Figure 3 for Figure 2 Enlarged structural diagram at point A in the diagram;

[0024] Figure 4 This is a cross-sectional view of the filter tube of a heat pump distillation system for warming up the pump, as proposed in this utility model.

[0025] Legend:

[0026] 1. Heat pump unit; 2. Distillation column; 3. Air cooler; 4. Reflux tank; 5. First delivery pipe; 6. Valve; 7. Second delivery pipe; 8. Third delivery pipe; 9. First connecting pipe; 10. Second connecting pipe; 11. Filter assembly; 1101. Filter tube; 1102. Filter screen; 1103. Positioning ring; 1104. Drive column; 1105. Fixing frame; 1106. Rotor. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Reference Figures 1-4This utility model provides an embodiment of a heat pump distillation system warm-up pump, including a heat pump unit 1 and a distillation column 2 located behind the heat pump unit 1. The heat pump distillation system warm-up pump also includes an air cooler 3, a reflux tank 4, a first delivery pipe 5, a valve 6, a second delivery pipe 7, a third delivery pipe 8, a first connecting pipe 9, a second connecting pipe 10, and a filter assembly 11. The outlet end of the top of the distillation column 2 is connected to the input end of the first delivery pipe 5. A valve 6 is installed at the bottom of the first delivery pipe 5, and the bottom outlet of the valve 6 is connected to the input end of the third delivery pipe 8. The output end of the third delivery pipe 8 is connected to the input end of the air cooler 3. The output end of the bottom of the air cooler 3 is connected to the input end of the reflux tank 4 through the second connecting pipe 10. A branch line is opened on the side wall of the first delivery pipe 5. The outlet and the branch outlet are connected to the input end of the second conveying pipe 7. The output end of the second conveying pipe 7 is connected to the input end of the heat pump unit 1. The output end of the bottom of the heat pump unit 1 is connected to the other input end of the return tank 4 through the first connecting pipe 9. A filter assembly 11 is installed in the middle section of the second conveying pipe 7. The filter assembly 11 includes a filter tube 1101 connected in series in the second conveying pipe 7. A filter screen 1102 is provided in the inner cavity of the filter tube 1101. A rotating wheel 1106 is provided on the rear side of the filter screen 1102. A transmission column 1104 is fixedly connected at the central axis of the rotating wheel 1106. The front end of the transmission column 1104 is fixedly connected to the center position of the filter screen 1102. A positioning ring 1103 is fixedly sleeved on the outer edge of the filter screen 1102. The inner wall of filter tube 1101 has an annular groove, and the positioning ring 1103 is rotatably fitted into the annular groove. A fixing frame 1105 is fixedly connected to the bottom of the inner wall of filter tube 1101. The bottom shaft of the rotating wheel 1106 is rotatably mounted on the fixing frame 1105. Several arc-shaped rotating blades are fixedly arranged on the outer surface of the rotating wheel 1106. The arc-shaped rotating blades are inclinedly distributed along the circumference of the rotating wheel 1106, and the force-bearing concave surface of the arc-shaped rotating blades faces the liquid outlet side of the filter screen 1102. The fixing frame 1105 is an inverted T-shaped support structure. The bottom end of the fixing frame 1105 is welded to the lower surface of the inner wall of filter tube 1101. A bearing seat is provided at the top center of the fixing frame 1105. The bottom shaft of the rotating wheel 1106 is rotatably inserted into the bearing seat through the bearing. The input end of valve 6 is connected to the first The bottom ends of the conveying pipes 5 and the output end of the valve 6 are sealed and fixedly connected to the input end of the third conveying pipe 8 by flanges. The connection point between the first conveying pipe 5 and the second conveying pipe 7 is located above the valve 6, and the installation height of the first conveying pipe 5 is set higher than the horizontal height of the inlet of the second conveying pipe 7. The air cooler 3 is equipped with a heat exchange tube bundle inside, and the two ends of the heat exchange tube bundle are respectively connected to the input end and the output end of the air cooler 3. A fan assembly is installed outside the air cooler 3. A pressure gauge interface is provided at the top of the reflux tank 4, and a pressure monitoring instrument is installed at the pressure gauge interface. A reflux pump interface is provided at the bottom of the reflux tank 4. A drain port is opened on the bottom wall of the filter pipe 1101, and the position of the drain port corresponds to the lower front side of the filter screen 1102.A sewage control valve is installed at the sewage outlet;

[0029] The filter assembly 11 includes a filter tube 1101 as the main support structure. Both ends of the filter tube 1101 are connected to the second delivery pipe 7. A fixing frame 1105 is welded and fixed to the bottom of the inner cavity of the filter tube 1101. The fixing frame 1105 adopts an inverted T-shaped support structure to ensure the stability of the support. A bearing seat is provided at the top center of the fixing frame 1105. The bottom shaft of the rotating wheel 1106 is rotatably inserted into the bearing seat via a bearing. The rotating wheel 1106 is located behind the filter screen 1102, i.e., in the direction of fluid outflow. Several arc-shaped blades are fixedly arranged on the outer surface of the rotating wheel 1106. These arc-shaped blades are inclinedly distributed along the circumference of the rotating wheel 1106, and the concave surface of the arc-shaped blades faces the outflow side of the filter screen 1102. This structural design allows the fluid flowing through the filter screen 1102 to impact the arc-shaped blades and drive the rotating wheel 1106 to rotate. A transmission is fixedly connected at the central shaft of the rotating wheel 1106. The drive column 1104 extends forward and is fixedly connected to the center of the filter screen 1102 on the front side, thus forming a transmission relationship in which the rotating wheel 1106 drives the filter screen 1102 to rotate synchronously through the drive column 1104. In order to ensure the stability and sealing of the filter screen 1102 during rotation, a positioning ring 1103 is fixedly sleeved on the outer edge of the filter screen 1102. The inner wall of the corresponding filter tube 1101 is provided with an annular groove. The positioning ring 1103 is rotatably fitted in the annular groove. This rotating fit structure of the ring and the groove restricts the axial displacement of the filter screen 1102 and provides guiding support for the rotation of the filter screen 1102. At the same time, a drain port is provided on the bottom wall of the filter tube 1101. The drain port is located on the lower front side of the corresponding filter screen 1102. A drain control valve is installed at the drain port to discharge the impurities that are thrown off by centrifugal force and settled to the bottom during the rotation of the filter screen 1102 to the outside of the system.

[0030] In a preferred embodiment, a plurality of arc-shaped blades are fixedly provided on the outer surface of the rotor 1106. The plurality of arc-shaped blades are inclinedly distributed along the circumference of the rotor 1106, and the force-bearing concave surface of the arc-shaped blades faces the liquid outlet side of the filter screen 1102, so as to generate the maximum rotational torque when the fluid impacts.

[0031] As another preferred embodiment, the specific structure of the fixing frame 1105 is an inverted T-shaped bracket structure. The bottom end of the fixing frame 1105 is fixedly connected to the lower surface of the inner wall of the filter tube 1101 by welding. A bearing seat is provided at the center of the top of the fixing frame 1105. The bottom shaft of the rotating wheel 1106 is inserted into the bearing seat through the bearing to achieve stable rotation support.

[0032] As another preferred embodiment, in order to ensure the sealing and detachability of the connection, the inlet end of valve 6 and the bottom end of the first delivery pipe 5, as well as the outlet end of valve 6 and the inlet end of the third delivery pipe 8, are sealed and fixedly connected by flanges.

[0033] As another preferred embodiment, in order to realize the diversion function of the pipeline, the connection position of the first delivery pipe 5 and the second delivery pipe 7 is set above the valve 6, and the installation height of the pipe body of the first delivery pipe 5 is set to be higher than the horizontal height of the inlet of the second delivery pipe 7, so as to guide the fluid into the second delivery pipe 7 by means of the liquid level difference.

[0034] As another preferred embodiment, the air cooler 3 is provided with a heat exchange tube bundle inside, and the two ends of the heat exchange tube bundle are respectively gathered and connected to the input end and the output end of the air cooler 3. A fan assembly is also fixedly installed on the outside of the air cooler 3, and the fan assembly is used to force air cooling of the heat exchange tube bundle.

[0035] As another preferred embodiment, the top of the reflux tank 4 is provided with a pressure gauge interface, and a pressure monitoring instrument is installed at the pressure gauge interface. The bottom of the reflux tank 4 is provided with a reflux pump interface for connecting to a subsequent delivery pump.

[0036] In another preferred embodiment, in order to discharge impurities, a drain port is provided on the bottom wall of the filter tube 1101. The drain port is located below the front side of the filter screen 1102 to facilitate the collection of settled impurities. A drain control valve is installed at the drain port to control the discharge of impurities.

[0037] Working principle: In the actual warm-up operation process of the equipment, the hot material accumulated inside the distillation column 2 located at the rear first flows into the inner wall channel of the first conveying pipe 5 through its top outlet. Then, the operator controls the speed and flow rate of the hot material flowing into the third conveying pipe 8 located at the bottom of the valve 6 by adjusting the opening degree of the valve 6 installed at the bottom of the first conveying pipe 5.

[0038] This adjustment mechanism ensures that the liquid level of the hot substance inside the first conveying pipe 5 is always higher than the inlet level of the second conveying pipe 7 connected to its side, thereby prompting a portion of the hot substance to enter the second conveying pipe 7 through the diversion port on the side wall of the first conveying pipe 5.

[0039] The hot material entering the third delivery pipe 8 is guided to the internal space of the air cooler 3 located on the right for cooling. The cold material after being cooled by the heat exchange tube bundle inside the air cooler 3 is then transported to the inner cavity of the return tank 4 located on the front side via the second connecting pipe 10 connected to the bottom of the air cooler 3. The fan assembly outside the air cooler 3 assists in cooling, and the pressure monitor monitors the internal pressure of the return tank 4 in real time.

[0040] Meanwhile, another portion of the hot material that did not enter the third delivery pipe 8 enters the heat pump unit 1 located on the left side through the second delivery pipe 7 connected to the side surface of the first delivery pipe 5 and flows through the filter assembly 11 installed in its middle section.

[0041] In the filter assembly 11, the flowing hot material first enters the internal channel of the filter tube 1101. Impurities in the hot material are blocked and filtered by the front surface of the filter screen 1102, which is cut across the flow channel. The clean hot material after filtration continues to flow backward and impacts the outer surface of the rotor 1106 installed behind the filter screen 1102. The arc-shaped blades on the outer surface of the rotor 1106, which are distributed in an arc shape, convert the thrust of the hot material flow into rotational torque, thereby driving the transmission column 1104 located at the central axis of the rotor 1106 to rotate. The rotation of the transmission column 1104 synchronously drives the filter screen 1102, which is fixedly connected to its front end, to rotate. This causes the positioning ring 1103, which is fixed to the outer edge of the filter screen 1102, to rotate smoothly within the annular groove surface opened on the inner wall of the filter tube 1101. The rotor 1106 is supported by the fixed frame 1105 at the bottom of the filter tube 1101 through the bearing. The centrifugal force generated by rotation is used to throw off the impurities attached to the front surface of the filter screen 1102. The thrown-off impurities settle to the bottom of the filter tube 1101 and can be discharged periodically through the drain control valve at the drain port. This achieves a highly efficient self-cleaning filtration effect for impurities in hot materials and can effectively prevent impurity particles from entering the precision inner cavity of the heat pump unit 1 and causing mechanical damage to it.

[0042] After the hot material completes its circulation inside the heat pump unit 1, it will be discharged into the interior of the front return tank 4 through the first connecting pipe 9 connected to the bottom output end of the heat pump unit 1. The high-temperature hot material and the low-temperature cold material will eventually mix in the inner wall space of the return tank 4. This process achieves the purpose of efficient pump warming.

Claims

1. A heat pump distillation system warm-up, comprising: Heat pump unit (1); A distillation column (2) is located behind the heat pump unit (1); The feature is that it also includes an air cooler (3), a reflux tank (4), a first delivery pipe (5), a valve (6), a second delivery pipe (7), a third delivery pipe (8), a first connecting pipe (9), a second connecting pipe (10), and a filter assembly (11); The outlet end of the top of the distillation column (2) is connected to the input end of the first conveying pipe (5). A valve (6) is installed at the bottom of the first conveying pipe (5). The bottom outlet of the valve (6) is connected to the input end of the third conveying pipe (8). The output end of the third conveying pipe (8) is connected to the input end of the air cooler (3). The output end of the bottom of the air cooler (3) is connected to the input end of the reflux tank (4) through the second connecting pipe (10). The first conveying pipe (5) has a branch port on its side wall, which is connected to the input end of the second conveying pipe (7). The output end of the second conveying pipe (7) is connected to the input end of the heat pump unit (1). The output end of the heat pump unit (1) at the bottom is connected to the other input end of the return tank (4) through the first connecting pipe (9). A filter assembly (11) is installed in the middle section of the second conveying pipe (7). The filter assembly (11) includes a filter tube (1101) connected in series in the second conveying pipe (7). A filter screen (1102) is provided in the inner cavity of the filter tube (1101). A filter screen (1102) is provided on the rear side of the filter screen (1102). A rotating wheel (1106) is provided, and a transmission column (1104) is fixedly connected to the central shaft of the rotating wheel (1106). The front end of the transmission column (1104) is fixedly connected to the center of the filter screen (1102). A positioning ring (1103) is fixedly sleeved on the outer edge of the filter screen (1102). An annular groove is provided on the inner wall of the filter tube (1101). The positioning ring (1103) is rotatably fitted in the annular groove. A fixing frame (1105) is fixedly connected to the bottom of the inner wall of the filter tube (1101). The bottom shaft of the rotating wheel (1106) is rotatably mounted on the fixing frame (1105).

2. A heat pump distillation system warm-up system according to claim 1, characterized in that: Several arc-shaped blades are fixedly arranged on the outer surface of the rotor (1106). The arc-shaped blades are inclinedly distributed along the circumference of the rotor (1106), and the force-bearing concave surface of the arc-shaped blades faces the liquid outlet side of the filter screen (1102).

3. A heat pump distillation system warm-up system according to claim 1, characterized in that: The fixing frame (1105) is an inverted T-shaped support structure. The bottom end of the fixing frame (1105) is welded to the lower surface of the inner wall of the filter tube (1101). A bearing seat is provided at the center of the top of the fixing frame (1105). The bottom shaft of the rotating wheel (1106) is inserted into the bearing seat through the bearing.

4. A heat pump distillation system warm-up system according to claim 1, characterized in that: The inlet end of valve (6) is fixedly connected to the bottom end of the first delivery pipe (5) and the outlet end of valve (6) is fixedly connected to the inlet end of the third delivery pipe (8) by flange sealing.

5. A heat pump distillation system warm-up system according to claim 1, characterized in that: The connection point between the first delivery pipe (5) and the second delivery pipe (7) is located above the valve (6), and the installation height of the first delivery pipe (5) is set at a level higher than the inlet of the second delivery pipe (7).

6. A heat pump distillation system warm-up system according to claim 1, characterized in that: The air cooler (3) is equipped with a heat exchange tube bundle inside, and the two ends of the heat exchange tube bundle are respectively connected to the input end and the output end of the air cooler (3). The air cooler (3) is equipped with a fan assembly outside.

7. A heat pump distillation system warm-up system according to claim 1, characterized in that: A pressure gauge interface is provided at the top of the reflux tank (4), and a pressure monitoring instrument is installed at the pressure gauge interface. A reflux pump interface is provided at the bottom of the reflux tank (4).

8. A heat pump distillation system warm-up system according to claim 1, characterized in that: A drain outlet is provided on the bottom wall of the filter tube (1101), and the location of the drain outlet corresponds to the lower front side of the filter screen (1102). A drain control valve is installed at the drain outlet.

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