CN207180158U - A kind of space division nitrogen precooling system - Google Patents

Abstract

The utility model discloses a kind of space division nitrogen precooling system, including air compressor, air aftercooler, air cooling tower, water- to-water heat exchanger, water-cooling tower, low temperature water pump and cooling unit, air aftercooler is housed on the air inlet pipeline between air cooling tower bottom and air compressor, water- to-water heat exchanger is housed on medium output pipe between water-cooling tower top, water- to-water heat exchanger is provided with circulating water intake and circulating water outlet, low temperature water pump and cooling unit are sequentially arranged with medium intake line between at the top of water cooling tower bottom and air cooling tower, outlet pipe at the top of air cooling tower is connected with molecular sieve.The utility model makes air enter air cooling tower bottom with normal temperature state, avoids Aging Damage of the high-temperature gas to air cooling tower bottom filling by setting air aftercooler on air inlet pipeline；Reduce by two normal temperature water pumps simultaneously, reduce equipment investment and maintenance cost.

Description

An air separation nitrogen water precooling system

technical field

The utility model relates to a precooling system, in particular to an air separation nitrogen water precooling system.

Background technique

The nitrogen water pre-cooling system is an important part of the air separation unit, and its main function is to cool and purify the raw air.

The traditional nitrogen water pre-cooling system is mainly composed of air cooling tower, water cooling tower, water filter, water chiller, two normal temperature water pumps and two low temperature water pumps. After the raw material air is pressurized, it directly enters the bottom of the air-cooling tower, and the temperature is close to 100°C. It needs to be pumped and pressurized by the circulating water system through two normal temperature water pumps. The normal temperature water enters from the middle of the air-cooling tower to cool and wash the air from top to bottom. This nitrogen-water precooling system has the problems of large equipment investment and high maintenance costs caused by aging damage of the high-temperature gas to the bottom packing of the air-cooling tower, and needs to be improved.

Utility model content

The purpose of the utility model is to overcome the above-mentioned problems existing in the prior art and provide an air separation nitrogen water precooling system.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the utility model is realized through the following technical solutions:

A kind of air separation nitrogen water precooling system, comprises air compressor, air final stage cooler, air cooling tower, water heat exchanger, water cooling tower, cryogenic water pump and cooling unit, between the bottom of described air cooling tower and air compressor An air final cooler is installed on the air intake pipeline, and a water heat exchanger is installed on the medium output pipeline between the bottom of the air cooling tower and the top of the water cooling tower, and the water heat exchanger is provided with a circulating water inlet and a circulating water outlet , the medium input pipeline between the bottom of the water-cooling tower and the top of the air-cooling tower is sequentially equipped with a low-temperature water pump and a cooling unit. There are two low-temperature water pumps connected in parallel. The air-cooling tower and the water-cooling tower use medium The output pipeline and the medium input pipeline form a loop, and the outlet pipeline at the top of the air cooling tower is connected with the molecular sieve.

Preferably, in the above-mentioned air separation nitrogen water precooling system, the inlet of the air compressor is provided with a suction filter.

Preferably, in the above-mentioned air separation nitrogen water precooling system, the medium used for washing the raw air in the medium output pipeline and the medium input pipeline is the unsaturated dirty nitrogen returned by the treated demineralized water through the rectification system Formed by absorbing moisture and venting.

Preferably, in the above-mentioned air separation nitrogen water precooling system, each pipeline between the cryogenic water pump and the cooling unit is provided with a flow meter.

Preferably, in the nitrogen-water pre-cooling system for air separation, an air intake pipeline for the reflux gas from the air separation is provided below the water cooling tower.

The beneficial effects of the utility model are:

The utility model has simple structure and reasonable design. By setting the final air cooler on the air intake pipeline, the air enters the bottom of the air-cooling tower at normal temperature, avoiding the aging damage of high-temperature gas to the packing at the bottom of the air-cooling tower; at the same time, two normal-temperature water pumps are reduced, Reduce equipment investment and maintenance costs.

Of course, any product implementing the present utility model does not necessarily need to achieve all the above-mentioned advantages at the same time.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is the structural representation of the utility model;

In the accompanying drawings, the list of parts represented by each label is as follows:

1-air compressor, 2-air final cooler, 3-air cooling tower, 4-water heat exchanger, 5-water cooling tower, 6-low temperature water pump, 7-cooling unit.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

Please refer to Fig. 1, the present embodiment is an air separation nitrogen water precooling system, including an air compressor 1, an air final cooler 2, an air cooling tower 3, a water heat exchanger 4, a water cooling tower 5, and a cryogenic water pump 6 and cooling unit 7. An air final stage cooler 2 is installed on the intake pipeline between the bottom of the air cooling tower 3 and the air compressor 1, and the inlet of the air compressor is provided with a suction filter. A water heat exchanger 4 is installed on the medium output pipeline between the bottom of the air cooling tower 3 and the top of the water cooling tower 5, and the water heat exchanger 4 is provided with a circulating water inlet and a circulating water outlet. A low-temperature water pump 6 and a cooling unit 7 are sequentially installed on the medium input pipeline between the bottom of the water cooling tower 5 and the top of the air cooling tower 3 . There are two cryogenic water pumps 6, which are connected in parallel. A flow meter is respectively arranged on the pipeline between the cryogenic water pump 6 and the cooling unit 7 . The air cooling tower 3 and the water cooling tower 5 use a medium output pipeline and a medium input pipeline to form a loop.

The outlet pipeline at the top of the air cooling tower 3 is connected with molecular sieves. The bottom of the water cooling tower 5 is also provided with an intake pipeline leading into the reflux gas from the air separation.

A specific application of this embodiment is: the raw material air is compressed by the air compressor 1 and enters the final air cooler 2 to be cooled to normal temperature, and the normal temperature raw material air enters the air cooling tower 3, the air cooling tower is a 3-packed tower, and the air flows from bottom to top After passing through the packing, it is cooled by the medium from top to bottom, and part of NOX, SO2, CL+ and other harmful substances are washed at the same time, and finally passes through the top separator and enters the molecular sieve purification system. The temperature of the treated air exiting the top of the air cooling tower is about 8°C . The medium used for washing the raw material air in the medium output pipeline and the medium input pipeline is formed by the unsaturated dirty nitrogen returned by the treated demineralized water through the rectification system to absorb moisture and then vent it. The medium is pre-cooled by the water heat exchanger 4, and then cooled by the water cooling tower 5 for the first time. After cooling, it is pressurized by the low-temperature water pump 6, and then cooled by the cooling unit 7 for the second time. Enter the air cooling tower 3 to cool the air to meet the intake requirements of the subsequent molecular sieve purification system.

In the description of this specification, descriptions referring to the terms "one embodiment", "example", "specific example" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in the description of the present invention. In at least one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not exhaust all details, nor do they limit the utility model to the specific implementations described. Obviously, many modifications and variations can be made based on the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the utility model, so that those skilled in the art can well understand and utilize the utility model. The invention is to be limited only by the claims and their full scope and equivalents.

Claims (5)

1. A kind of 1. space division nitrogen precooling system, it is characterised in that：Including air compressor, air aftercooler, air cooling tower, water Heat exchanger, water-cooling tower, low temperature water pump and cooling unit, are filled on the air inlet pipeline between the air cooling tower bottom and air compressor Have an air aftercooler, at the top of the air cooling tower bottom and water-cooling tower between medium output pipe on water- to-water heat exchanger is housed, The water- to-water heat exchanger is provided with circulating water intake and circulating water outlet, at the top of the water cooling tower bottom and air cooling tower between medium Low temperature water pump and cooling unit are sequentially arranged with intake line, the low temperature water pump shares two, and is carried out using parallel way Connection, the air cooling tower, water-cooling tower form a loop, the air cooling tower top using medium output pipe, medium intake line The outlet pipe in portion is connected with molecular sieve.
2. 2. space division nitrogen precooling system according to claim 1, it is characterised in that：The import of the air compressor is provided with Filter by suction.
3. 3. space division nitrogen precooling system according to claim 1, it is characterised in that：The medium output pipe, medium are defeated Enter the medium of washing material air in pipeline, be that the unsaturation returned by softened water after treatment by distillation system is dirty Nitrogen adsorption moisture is simultaneously vented formation.
4. 4. space division nitrogen precooling system according to claim 1, it is characterised in that：Every the low temperature water pump and cooler A flowmeter is respectively provided with pipeline between group.
5. 5. space division nitrogen precooling system according to claim 1, it is characterised in that：It is additionally provided with below the water-cooling tower logical Enter the air inlet pipeline of the gas that backflows from space division.