CN203796527U - Direct air cooling unit evacuation pipeline cooling system with absorption heat pump - Google Patents

Abstract

The utility model discloses a direct air cooling unit evacuation pipeline cooling system with an absorption heat pump. The system comprises an air cooling island, a heat pump, a vacuum pump set, and a steam cooler. The air cooling island is connected with the heat pump through a heat pump heating butterfly valve. The air cooling island is connected with the vacuum pump set through a first pipeline. The air cooling island is connected with the steam cooler through a second pipeline. The steam cooler is connected with the vacuum pump set through a third pipeline. The problem about equipment safety of the vacuum pumps operating under high backpressure is solved effectively.

Description

Direct air cooling unit with absorption heat pump Evacuated pipeline cooling system

technical field

The utility model relates to the field of electric power, in particular to a direct air-cooling unit with an absorption heat pump and a vacuum pipeline cooling system.

Background technique

In recent years, the waste steam recovery and utilization technology of direct air cooling units has been widely used. During the heating period in winter, increasing the back pressure of the unit can provide more and higher-quality heat sources for end heat users, which greatly improves the cogeneration economy of the unit. In the current design of heating units, a unit system with one unit and one heat pump is generally adopted. The vacuum system of the steam turbine and the vacuum system of the heat pump operate in parallel, and the vacuum required by the system is maintained by the operation of the vacuum pump.

Due to the different degrees of air leakage of the unit and the poor matching of the characteristics of the vacuum pumping pipeline between the steam turbine and the heat pump, when the unit supplies heat to the outside in winter, a large amount of steam in the heat pump is directly pumped out by the vacuum pump, which not only increases the work load of the vacuum pump, but also causes The temperature of the working medium in the vacuum pump rises sharply, which aggravates the degree of cavitation of the vacuum pump and seriously threatens the safety of the equipment.

Utility model content

The utility model provides a vacuum pipeline cooling system of a direct air cooling unit with an absorption heat pump, which effectively solves the equipment safety problem that the vacuum pump operates under high back pressure.

The utility model embodiment adopts following technical scheme:

A direct air-cooling unit vacuum pumping pipeline cooling system with an absorption heat pump, including: an air-cooling island, a heat pump, a vacuum pump unit, and a steam cooler; the air-cooling island is connected to the heat pump through a heat pump heating butterfly valve; The air-cooled island is connected to the steam cooler through pipelines; the steam cooler is connected to the vacuum pump group through pipelines.

Optionally, it also includes: a cooler bypass manual door, and the cooler bypass manual door is arranged on the pipeline between the air-cooling island and the vacuum pump unit.

Optionally, it also includes: a cooler outlet manual door, and the cooler outlet manual door is arranged on the pipeline between the vapor cooler and the vacuum pump unit.

Optionally, it also includes: cooler inlet, the cooler inlet manual door is set on the pipeline between the air cooling island and the steam cooler

Optionally, it also includes: a manual door for circulating water inlet, the steam cooler is connected to the manual door for circulating water inlet.

Optionally, it also includes: the circulating water outlet manual door, the steam cooler is connected to the circulating water outlet manual door.

Based on the above technical solution, the air-cooled island is connected to the heat pump through the heat pump heating butterfly valve, the air-cooled island is connected to the vacuum pump group through the pipeline, the air-cooled island is connected to the steam cooler through the pipeline, and the steam cooler is connected to the vacuum pump group through the pipeline. Thus effectively solving the equipment safety problem that the vacuum pump operates under high back pressure.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the appended drawings in the following description The drawings show some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

Fig. 1 is a schematic structural diagram of a vacuum pipeline cooling system of a direct air cooling unit with an absorption heat pump provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described implementation Example is a part of embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The embodiment of the utility model provides a direct air-cooling unit with an absorption heat pump to vacuumize the pipeline cooling system, including a steam cooler, a manual door for bypassing the cooler, a manual door for steam inlet, a manual door for draining water, a manual door for vacuuming, and a circulating water Inlet manual door, circulating water outlet manual door and related pipelines, this kind of cooling system uses external circulating water to cool the steam on the surface. When the unit is heating in winter or the unit is running under high back pressure, put this cooling system into operation, open the manual door for the outlet and inlet of the circulating water of the cooler, then slightly open the manual door for drainage of the cooler, and vacuumize the system. After the vacuum is completely established, Then fully open the cooler inlet and outlet manual doors, and gradually close the cooler bypass manual door after the cooler works normally. There is an on-site water level gauge on the steam cooler, and you can observe whether there is water in the cooler at any time to judge whether the cooler is working normally or not. When the cooler is faulty and needs to be repaired, the above-mentioned valve can be used to fully isolate and repair it. In the vapor-gas mixture fully cooled by the cooling system, the proportion of water vapor is very small, and the air in the mixture may be over-cooled, which is much lower than the saturation temperature under the exhaust pressure. After being pressurized by the vacuum pump, it will be discharged to the atmosphere. . This kind of cooling system can be put into operation for a long time without failure. Under high back pressure and high exhaust temperature, the non-condensable gas fully cooled by the cooler can minimize the load of the vacuum pump and reduce the cavitation of the vacuum pump impeller. To a certain extent, prolong the service life of the vacuum pump.

Below in conjunction with accompanying drawing, the utility model is described in detail.

As shown in Figure 1, a direct air-cooling unit vacuum pumping pipeline cooling system with an absorption heat pump according to an embodiment of the utility model includes a steam cooler 4, a cooler bypass manual door 11, a cooler inlet manual door 8, a cooling Device outlet manual door 12, drain manual door 13, circulating water inlet manual door 9, circulating water outlet manual door 10 and related pipelines. Before the cooler is put into operation, open the circulating water inlet manual door 9 and the outlet manual door 10, slowly open the cooler drain manual door 13, vacuumize the inside of the cooler and the pipeline, and then open the cooler outlet after the vacuum is completely established Manual door 12 and cooler inlet manual door 9, and then close the cooler bypass manual door 11, so that the non-condensable gas in the system is pumped out by the vacuum pump group 5 and discharged into the atmosphere, and the water condensed in the cooler passes through the manual door Exhaust to exhaust device 1.

When the unit is in normal operation, part of the exhaust steam from the steam exhaust device 1 is directly discharged to the air-cooled island 3. After being condensed by the air-cooled condenser, the non-condensable gas and part of the steam are directly drawn out by the vacuum pump unit 5 through the vacuum pumping pipeline, and the other part is passed through the air-cooled condenser. The heat pump heating butterfly valve 6 enters the heat pump 2. After heating the circulating water, the non-condensable gas and part of the steam pass through the heat pump vacuum door 7 and are exhausted to the atmosphere through the vacuum pump group 5. When the unit is heating in winter, in order to obtain better economy, the operation mode of high back pressure is generally adopted, so that the exhaust steam temperature of the unit is around 70 degrees Celsius, and the steam extracted by the vacuum pump is relatively large, which causes the temperature of the circulating medium of the vacuum pump to rise. The degree of cavitation to the pump impeller blades is aggravated. In addition, when the unit operates under high temperature conditions in summer, it cannot carry full load due to the limited back pressure, and there are also phenomena such as excessive vacuum pumping load, high temperature of the operating medium, and serious cavitation of the pump wheel. Therefore, adding a cooling system to the vacuum pumping pipeline of the unit will greatly reduce the output of the vacuum pump and the degree of cavitation of the pump wheel, and prolong the service life of the equipment.

During the normal operation of the system, if abnormalities occur, such as water leakage on the water side of the cooler, vacuum leakage on the steam side and other failures that cannot be maintained, the cooler bypass door 11 can be opened, and then the cooler inlet manual door 8 and cooler outlet can be closed. The manual door 12 completely isolates the steam side of the cooler without affecting the operation of the unit. Then according to the fault type, the circulating water inlet door 9, the circulating water outlet door 10 and the cooler drain door 13 can be closed to completely isolate the system if necessary.

The utility model has the characteristics of small one-time investment, high utilization rate and high reliability, and effectively ensures the safe operation of the vacuum pump.

The above is only a preferred embodiment of the present utility model, but the scope of protection of this patent is not limited thereto. Within the relevant technical scope, changes or replacements that can be easily thought of should be covered by the protection of this patent. within range. Therefore, the protection scope of this patent should be based on the protection scope of the claims.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Claims (6)

1. A direct air-cooling unit vacuum pumping pipeline cooling system with an absorption heat pump, characterized in that it comprises: an air-cooling island, a heat pump, a vacuum pump group, and a steam cooler; the air-cooling island is connected to the heat pump through a heat pump heating butterfly valve; The air cooling island is connected to the vacuum pump group through pipelines; the air cooling island is connected to the steam cooler through pipelines; and the steam cooler is connected to the vacuum pump group through pipelines. the 2 . The system according to claim 1 , further comprising: a cooler bypass manual door, and the cooler bypass manual door is arranged on the pipeline between the air-cooling island and the vacuum pump unit. 3 . the 3 . The system according to claim 1 , further comprising: a cooler outlet manual door, the cooler outlet manual door being arranged on the pipeline between the vapor cooler and the vacuum pump unit. 4 . the 4. The system according to claim 1, further comprising: a cooler inlet manual door, the cooler inlet manual door is arranged on the pipeline between the air cooling island and the steam cooler. the 5. The system according to claim 1, further comprising: a manual door for circulating water inlet, the steam cooler is connected to the manual door for circulating water inlet. the 6. The system according to claim 1, further comprising: a manual door for circulating water outlet, the steam cooler is connected to the manual door for circulating water outlet. the