CN218937097U - Heat exchange device of screw expansion unit - Google Patents

Abstract

The utility model provides a heat exchange device of a screw expansion unit, which comprises a heat exchange shell, a heat exchange tube and a flow regulating device, wherein the heat exchange tube is spirally wound along the axial direction of an inner cavity of the heat exchange shell, the cooling tube is communicated with the heat exchange tube, the cooling tube comprises a liquid inlet tube and a liquid outlet tube, one end of the heat exchange tube is communicated with the liquid outlet tube, the other end of the heat exchange tube is communicated with the liquid inlet tube, the flow regulating device comprises a flow regulating tube and flow regulating valves at all levels, and the flow regulating tube is communicated with the liquid inlet tube and the liquid outlet tube. The flow of the medium to be cooled in the flow regulating pipe is regulated by regulating the opening degree of the first flow regulating valve and/or the second flow regulating valve in the flow regulating device, the temperature of the cooling completion medium finally discharged by the liquid outlet pipe is controlled by controlling the mixing proportion of the medium to be cooled in the flow regulating pipe and the cooled medium in the liquid outlet pipe, and the long-term operation can be realized without any energy supply, water supply, power source, maintenance and overhaul.

Description

Heat exchange device of screw expansion unit

Technical Field

The utility model belongs to the technical field of machinery.

Background

The existing cooling modes for the screw expander mainly comprise two modes: the air cooling is mainly an air cooler, and the water cooling is mainly a plate heat exchanger. The air cooler drives a fan through a motor, blows low-temperature air through the fan to pass through the heat exchanger body, and cools the heat exchanger through the low-temperature air so as to cool a medium. The air cooler is only suitable for areas with lower temperature, and needs electric power to drive, and the fan needs to be maintained regularly.

The water cooler is used for cooling the medium through water with lower temperature, a path of water which is circulated continuously is needed, the circulating water is required to be cooled through other modes (such as cooling water), and new tap water can be used all the time, but the cost is high, and the water quantity needed by the water cooler for one hour is different from several tons to tens of tons. In summary, the air cooling requires electric energy consumption, the water cooling requires bypass water or continuous consumption of fresh water, and the cost is not small.

The natural gas is utilized to push the screw expander to generate power, namely the natural gas input into the expander has higher temperature reaching 20 ℃ to 50 ℃, and the exhaust temperature after the screw rotor is pushed by the expander to do work to generate power is reduced to minus 50 ℃ to 0 ℃. The natural gas after cooling is transported to a user for use, and is slowly heated to normal temperature by air in the middle, so that the residual cold energy of-50 ℃ to 0 ℃ cannot be fully recycled.

Disclosure of Invention

The embodiment of the utility model provides a heat exchange device of a screw expansion unit, which comprises a heat exchange shell, and a heat exchange tube which is spirally wound along the axial direction of an inner cavity of the heat exchange shell, and a cooling pipeline which is communicated with the heat exchange tube, wherein the cooling pipeline comprises a liquid inlet pipe and a liquid outlet pipe, one end of the heat exchange tube is communicated with the liquid outlet pipe, and the other end of the heat exchange tube is communicated with the liquid inlet pipe.

Further, the heat exchange device of the screw expansion unit provided by the utility model comprises a flow regulating device, wherein the flow regulating device comprises a flow regulating pipe, and the flow regulating pipe is communicated with the liquid inlet pipe and the liquid outlet pipe. The flow regulating device comprises a first flow regulating valve arranged on the liquid inlet pipe, and the flow regulating device comprises a second flow regulating valve arranged on the flow regulating pipe.

Further, the flow regulating device comprises a controller for controlling the first flow regulating valve and the second flow regulating valve and a remote automatic control system.

The flow of the medium to be cooled in the flow regulating pipe is regulated by regulating the opening degree of the first flow regulating valve and/or the second flow regulating valve in the flow regulating device, and the temperature of the cooling completion medium finally discharged from the liquid outlet pipe is accurately controlled by controlling the mixing proportion of the medium to be cooled in the flow regulating pipe and the cooled medium in the liquid outlet pipe.

The beneficial effects achieved by the utility model are as follows:

1. the high-temperature cooling medium waiting for cooling and recycling after absorbing heat from the screw expansion unit and other high-temperature mediums led into the outside can exchange heat through the heat exchange device disclosed by the utility model, and the medium to be cooled can be effectively cooled, so that the effect of fully recycling cold energy is achieved.

2. The heat exchange tube in the heat exchange device is arranged in a spiral winding mode, so that the heat exchange area in unit space can be increased, the requirement on the use area is reduced, and the equipment space is fully utilized.

3. The heat exchange tube and the cooling pipeline can be designed into one group, two groups or multiple groups, and different media can be cooled simultaneously.

4. The flow regulating device can display the cooling condition and accurately regulate and adjust the mixing proportion of the medium to be cooled and the cooled medium through the combination of various modes so as to realize the aim of accurately controlling the accurate cooling of the medium to be cooled.

5. The heat exchange device does not need any energy supply, water supply and power source, can meet the cooling requirement of a medium to be cooled only by the cold energy of the self exhaust of the screw expander, and can stably run for a long time without maintenance.

Drawings

Fig. 1 is a schematic structural diagram of a heat exchange device of a screw expansion unit according to an embodiment of the present utility model.

Reference numerals

The heat exchange device comprises a 1-heat exchange shell, a 2-heat exchange tube, a 3-liquid inlet tube, a 4-liquid outlet tube, a 5-flow regulating tube, a 6-first flow regulating valve and a 7-second flow regulating valve.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The utility model provides a heat exchange device of a screw expansion unit, which consists of three parts: comprises a spiral winding tube type heat exchanger, a cooling pipeline and a natural gas inlet and exhaust pipe.

The spiral winding tube type heat exchanger consists of a heat exchange shell and a cooling pipeline, wherein SUS304 stainless steel or SUS316L stainless steel can be selected as materials, a vertical installation method can be adopted, a natural gas inlet is arranged at the lower end, and a natural gas exhaust port is arranged at the upper end, so that the speed of gas flowing out of the device is slowed down, and the cooling time is increased.

Parameters such as heat exchange area, length and diameter of each part of the heat exchange device are calculated according to the exhaust temperature of the screw expander and the working condition of the medium to be cooled, and the cooling pipeline adopts a spiral winding type structural design, so that the heat exchange area in unit space can be increased, the requirement on the use area is reduced, and the equipment space is fully utilized. The cooling pipeline adopts a design that a medium inlet to be cooled is arranged at the upper part and a medium outlet is arranged at the lower part after cooling, so that all cooling mediums are conveniently emptied.

The heat exchange tube and the cooling pipeline can be designed into one group, two groups or multiple groups, and different media such as cooling water for mechanical sealing of a screw expander, cooling lubricating oil for lubricating a bearing and a gear and the like can be cooled simultaneously. The shell is generally large in the middle and small at two ends, so that the purpose of the design is to give more space for more middle spiral cooling pipelines and ensure that the pressure loss of the pipelines is smaller than a design value. The spiral winding tube type heat exchanger meets the requirements of national standard GB/T151 heat exchanger, and pressure experiments are carried out after manufacturing, so that safety and reliability are ensured.

Referring to fig. 1, an embodiment of the present utility model provides a heat exchange device of a screw expansion unit, including a heat exchange housing 1, a heat exchange tube 2 spirally wound along an axial direction of an inner cavity of the heat exchange housing 1, and a cooling pipeline communicated with the heat exchange tube 2, wherein the cooling pipeline includes a liquid inlet tube 3 and a liquid outlet tube 4, one end of the heat exchange tube 2 is communicated with the liquid outlet tube 3, and the other end of the heat exchange tube 2 is communicated with the liquid inlet tube 4.

Preferably, the heat exchange device of the screw expansion unit comprises a flow regulating device, the flow regulating device comprises a flow regulating pipe 5, and the flow regulating pipe 5 is communicated with the liquid inlet pipe 3 and the liquid outlet pipe 4. The flow regulating device comprises a first flow regulating valve 6 arranged on the liquid inlet pipe, and the flow regulating device comprises a second flow regulating valve 7 arranged on the flow regulating pipe.

As the opening degree of the first flow regulating valve 6 decreases, the flow rate of the medium to be cooled flowing into the liquid inlet pipe 3 decreases.

With the second flow regulating valve 7 opened, some medium to be cooled is shunted from the liquid inlet pipe 3 through the flow regulating pipe 5 and enters the liquid outlet pipe 4, uncooled medium is mixed with cooled medium, the cooled medium temperature is increased, and the method is suitable for the situation that the cooled medium temperature is lower than the required use temperature.

The opening degree of the second flow regulating valve 7 and/or the opening degree of the first flow regulating valve 6 in the flow regulating device are/is regulated to regulate the flow of the medium to be cooled, which is shunted to the flow regulating pipe 5 by the liquid inlet pipe 3, and the temperature of the cooled medium finally discharged by the liquid outlet pipe is precisely controlled by controlling the mixing proportion of the medium to be cooled in the flow regulating pipe and the cooled medium in the liquid outlet pipe.

The cooling liquid pipe can also be regulated through a plurality of valves (such as a temperature control valve, a flow control valve, a duplex three-way valve and the like) so as to improve the accuracy of flow control and ensure that the cooled medium temperature meets various more complex use requirements. The pressure gauge or the pressure transmitter can be designed on the pipeline so as to observe the pressure change and the pressure loss, and the condition of temperature can be observed in real time by designing an on-site thermometer or a thermal resistor and the like, namely, the cooling condition can be displayed and the heat exchange requirement can be completed by combining different modes.

Preferably, the flow regulating device comprises a controller and a remote automatic control system for controlling the flow regulating valves, the air inflow, the air exhaust amount, the medium inflow and the medium exhaust amount, and temperature, pressure and flow monitors and the like at all positions, so that the whole heat exchange flow is controlled more accurately and automatically, and the whole unmanned full-automatic operation of the device is realized.

The high-temperature cooling medium waiting for cooling and recycling after absorbing heat from the screw expansion unit and other high-temperature mediums led into the outside can exchange heat through the heat exchange device disclosed by the utility model, and can effectively cool the cooling liquid so as to achieve the effect of fully utilizing the cooling energy.

The heat exchange device of the screw expander is arranged on the exhaust port pipeline (extension section) of the screw expander, so that the exhaust gas of the screw expander directly passes through the inside of the heat exchange device, and the exhaust gas of minus 50 ℃ to 0 ℃ is used for cooling the medium, thereby not consuming any energy supply water and power sources, only the cooling energy of the exhaust gas of the screw expander can meet the cooling requirement of the medium to be cooled, and the device can run for a long time without maintenance and overhaul, and is a safe, energy-saving, stable and reliable cooling device.

In the present utility model, the directional words such as "upper and lower, inner and outer" and the like included in the terms merely represent positional relationships of the terms based on the drawings or the conventional arrangement of the products in use, or are common names for facilitating understanding of those skilled in the art, and do not indicate or imply that the terms must have a specific positional configuration or operation, only for simplifying the description, and should not be construed as limiting the terms.

The particular features, structures, materials, or characteristics described in this specification may be combined or combined in any suitable manner in any one or more embodiments or examples.

All of the above-described mounting, connecting, or arrangement means are to be construed broadly and all of the components thereof not specifically described materials, structures, models, dimensions, and index of coefficients, etc. are general techniques thereof, and may be substituted as long as the objectives are achieved.

The foregoing is merely a preferred embodiment of the present utility model, but the implementation of the present utility model is not limited to the foregoing embodiment, and those skilled in the art may still modify the technical solutions described in the foregoing embodiment or make equivalent changes to some of the technical features thereof.

Any modification, substitution, variation, modification, combination, simplification, etc. made or directly or indirectly applied to other relevant technical fields are included in the scope of the present utility model.

Claims (8)

1. The utility model provides a screw rod expansion unit heat transfer device which characterized in that: the heat exchange device comprises a heat exchange shell, a heat exchange tube and a flow regulating device, wherein the heat exchange tube is arranged along the axial spiral winding of the inner cavity of the heat exchange shell, the cooling tube is communicated with the heat exchange tube, the cooling tube comprises a liquid inlet tube and a liquid outlet tube, one end of the heat exchange tube is communicated with the liquid outlet tube, the other end of the heat exchange tube is communicated with the liquid inlet tube, the flow regulating device comprises a flow regulating tube, and the flow regulating tube is communicated with the liquid inlet tube and the liquid outlet tube.

2. The screw expander train heat exchange device of claim 1, wherein: the flow regulating device comprises a first flow regulating valve arranged on the liquid inlet pipe.

3. The screw expander train heat exchange device of claim 1, wherein: the flow regulating device comprises a second flow regulating valve arranged on the flow regulating pipe.

4. The screw expander train heat exchange device of claim 1, wherein: the heat exchange tube is wound in a double spiral mode.

5. The screw expander train heat exchange device of claim 4, wherein: the heat exchange pipes and the cooling pipes are one group, two groups or multiple groups.

6. The screw expander train heat exchange device of claim 1, wherein: the air inlet is arranged at the lower end of the device, and the air outlet is arranged at the upper end of the device; the inlet of the medium to be cooled is arranged at the upper end of the device, and the discharge port is arranged at the lower end of the device.

7. The screw expander train heat exchange device of claim 1, wherein: the heat exchange device uses natural gas as a cooling medium.

8. The screw expander train heat exchange device of claim 1, wherein: the heat exchange device is an auxiliary device of the screw expansion unit.

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