阅读说明：本技术 一种透平驱动气体压缩系统及其工作方法 (Turbine driving gas compression system and working method thereof ) 是由 郑开云 黄志强 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种透平驱动气体压缩系统,包括二氧化碳压缩机、低温回热器、高温回热器、加热器、透平、空气预热器、预冷器、间冷器和空压机。本发明可将空气经空压机增压后升温的热量加以回收,被超临界二氧化碳循环利用,减少了加热器的热功率,从而使空气压缩过程的热耗下降,节省了生产成本,在超临界二氧化碳循环中,若不计入所回收的压缩空气间冷的热量,则循环的热效率可达50％,而常规的蒸汽透平机组的热效率约为35％,但是本发明的空压机的功耗较高,比常规压缩过程增加了约10％,因此,总的空气压缩过程的热耗下降约20％。(The invention discloses a turbine-driven gas compression system which comprises a carbon dioxide compressor, a low-temperature heat regenerator, a high-temperature heat regenerator, a heater, a turbine, an air preheater, a precooler, an intercooler and an air compressor. The invention can recover the heat quantity of the air heated after being pressurized by the air compressor and recycle the heat quantity by the supercritical carbon dioxide, thereby reducing the thermal power of the heater, reducing the heat consumption in the air compression process and saving the production cost, and in the supercritical carbon dioxide cycle, if the heat quantity of the indirect cooling of the recovered compressed air is not taken into account, the thermal efficiency of the cycle can reach 50 percent, while the thermal efficiency of the conventional steam turbine unit is about 35 percent, but the power consumption of the air compressor of the invention is higher, which is increased by about 10 percent compared with the conventional compression process, thereby the total heat consumption in the air compression process is reduced by about 20 percent.)

1. A turbine driven gas compression system comprising

The carbon dioxide compressor is used for compressing the carbon dioxide working medium;

the low-temperature regenerator is used for heating the carbon dioxide working medium pressurized by the carbon dioxide compressor, and a low-temperature side inlet of the low-temperature regenerator is communicated with an outlet of the carbon dioxide compressor;

the high-temperature regenerator is used for heating the carbon dioxide working medium heated by the low-temperature regenerator, a low-temperature side inlet of the high-temperature regenerator is communicated with a low-temperature side outlet of the low-temperature regenerator, and a high-temperature side outlet of the high-temperature regenerator is communicated with a high-temperature side inlet of the low-temperature regenerator;

the heater is used for further heating the carbon dioxide working medium heated by the high-temperature heat regenerator, and an inlet of the heater is communicated with a low-temperature side outlet of the high-temperature heat regenerator;

the inlet of the turbine is communicated with the outlet of the heater, and the outlet of the turbine is communicated with the high-temperature side inlet of the high-temperature regenerator;

the air preheater is used for preheating air, a carbon dioxide side inlet of the air preheater is communicated with a high-temperature side outlet of the low-temperature heat regenerator, and an air inlet of the air preheater is communicated with the outside atmosphere;

the precooler is used for further cooling the carbon dioxide working medium cooled by the air preheater, the inlet of the precooler is communicated with the carbon dioxide side outlet of the air preheater, and the outlet of the precooler is communicated with the inlet of the carbon dioxide compressor;

the carbon dioxide side inlet of the intercooler is communicated with the outlet of the carbon dioxide compressor, and the carbon dioxide side outlet of the intercooler is communicated with the low-temperature side inlet of the high-temperature regenerator;

the air compressor is used for boosting air through pushing of a turbine, a first section inlet of the air compressor is communicated with an air outlet of the air preheater, a first section outlet of the air compressor is communicated with a first section air side inlet of the intercooler, a first section air side outlet of the intercooler is communicated with a second section inlet of the air compressor, a second section outlet of the air compressor is communicated with a second section air side inlet of the intercooler, a second section air side outlet of the intercooler is communicated with a third section inlet of the air compressor, a third section outlet of the air compressor is communicated with a third section air side inlet of the intercooler, a third section air side outlet of the intercooler is communicated with a fourth section inlet of the air compressor, and a fourth section outlet of the air compressor is communicated with chemical equipment arranged at the downstream.

2. A turbine drive gas compression system as set forth in claim 1 wherein: the carbon dioxide compressor, the turbine and the air compressor are coaxially arranged.

3. A method of operating a turbine driven gas compression system, the method operating with a turbine driven gas compression system as claimed in any one of claims 1 or 2, comprising the steps of:

s1, boosting a carbon dioxide working medium by a carbon dioxide compressor, dividing the carbon dioxide working medium into two paths, enabling one path of the carbon dioxide working medium to enter a low-temperature regenerator to absorb waste heat of the carbon dioxide working medium discharged by a turbine, and enabling the other path of the carbon dioxide working medium to enter an intercooler to absorb heat of compressed air and cool the compressed air;

s2, combining the two heated carbon dioxide working media, and allowing the two carbon dioxide working media to enter a high-temperature heat regenerator to absorb the waste heat of the carbon dioxide working media discharged by a turbine;

s3, the carbon dioxide working medium heated by the high-temperature heat regenerator enters a heater for further heating, and finally enters a turbine for expansion to do work, and the turbine pushes an air compressor to work;

s4, releasing heat of the carbon dioxide working medium discharged by the turbine through a high-temperature heat regenerator and a low-temperature heat regenerator, releasing heat to air through an air preheater, cooling to normal temperature through a precooler, and returning to a carbon dioxide compressor;

and S5, air preheated by the air preheater enters a first section of an air compressor for pressurization, then enters a first section of an intercooler for cooling, then enters a second section of the air compressor for pressurization, then enters a second section of the intercooler for cooling, then enters a third section of the air compressor for pressurization, then enters a third section of the intercooler for cooling, then enters a fourth section of the air compressor for pressurization, and finally is sent to downstream chemical equipment.

4. A method of operating a turbine driven gas compression system as claimed in claim 3, wherein: and the pressure at the outlet of the carbon dioxide compressor in the S1 is 15-20 Mpa.

5. A method of operating a turbine driven gas compression system as claimed in claim 3, wherein: the inlet temperature of the S3 turbine is 450-550 ℃.

6. A method of operating a turbine driven gas compression system as claimed in claim 3, wherein: and the compression ratio of the first section to the fourth section of the air compressor of the S5 is 2-3.

Technical Field

The invention relates to the technical field of gas compression, in particular to a turbine driving gas compression system and a working method thereof.

Background

In the chemical industry, various air compressors and process gas compressors are used, which are usually driven by a steam turbine or a gas turbine. Because the gas compression energy consumption is high and has important influence on the production cost, the energy-saving and consumption-reducing task is valued by chemical enterprises for a long time. With the innovative development of turbine technology, a novel high-efficiency energy-saving driving scheme is claimed.

In recent years, the power cycle development taking supercritical carbon dioxide as a working medium is fast, and a supercritical carbon dioxide turbine becomes a new generation of power device. The critical point of carbon dioxide is 31 ℃/7.4MPa, and the state when the temperature and pressure exceed the critical point is a supercritical state. The supercritical carbon dioxide power cycle has good application prospect due to stable chemical property, high density, no toxicity, low cost, simple cycle system, compact structure, quick start and stop and high efficiency.

According to the gas compression process in a chemical plant, a novel turbine driving gas compression system can be formed by combining with supercritical carbon dioxide circulation, and the energy consumption is expected to be further reduced.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to provide the turbine driving gas compression system and the working method thereof, which have the advantages of reasonable design and simple structure, can recover the heat generated by the temperature rise of the air after being pressurized by the air compressor, recycle the heat by the supercritical carbon dioxide and reduce the thermal power of the heater, thereby reducing the heat consumption in the air compression process and saving the production cost.

In order to solve the technical problems, the invention adopts the following technical scheme:

a turbine driven gas compression system comprising

The carbon dioxide compressor is used for compressing the carbon dioxide working medium;

the low-temperature regenerator is used for heating the carbon dioxide working medium pressurized by the carbon dioxide compressor, and a low-temperature side inlet of the low-temperature regenerator is communicated with an outlet of the carbon dioxide compressor;

the high-temperature regenerator is used for heating the carbon dioxide working medium heated by the low-temperature regenerator, a low-temperature side inlet of the high-temperature regenerator is communicated with a low-temperature side outlet of the low-temperature regenerator, and a high-temperature side outlet of the high-temperature regenerator is communicated with a high-temperature side inlet of the low-temperature regenerator;

the heater is used for further heating the carbon dioxide working medium heated by the high-temperature heat regenerator, and an inlet of the heater is communicated with a low-temperature side outlet of the high-temperature heat regenerator;

the inlet of the turbine is communicated with the outlet of the heater, and the outlet of the turbine is communicated with the high-temperature side inlet of the high-temperature regenerator;

the air preheater is used for preheating air, a carbon dioxide side inlet of the air preheater is communicated with a high-temperature side outlet of the low-temperature heat regenerator, and an air inlet of the air preheater is communicated with the outside atmosphere;

the precooler is used for further cooling the carbon dioxide working medium cooled by the air preheater, the inlet of the precooler is communicated with the carbon dioxide side outlet of the air preheater, and the outlet of the precooler is communicated with the inlet of the carbon dioxide compressor;

the carbon dioxide side inlet of the intercooler is communicated with the outlet of the carbon dioxide compressor, and the carbon dioxide side outlet of the intercooler is communicated with the low-temperature side inlet of the high-temperature regenerator;

the air compressor is used for boosting air through pushing of a turbine, a first section inlet of the air compressor is communicated with an air outlet of the air preheater, a first section outlet of the air compressor is communicated with a first section air side inlet of the intercooler, a first section air side outlet of the intercooler is communicated with a second section inlet of the air compressor, a second section outlet of the air compressor is communicated with a second section air side inlet of the intercooler, a second section air side outlet of the intercooler is communicated with a third section inlet of the air compressor, a third section outlet of the air compressor is communicated with a third section air side inlet of the intercooler, a third section air side outlet of the intercooler is communicated with a fourth section inlet of the air compressor, and a fourth section outlet of the air compressor is communicated with chemical equipment arranged at the downstream.

In a preferred embodiment of the invention, the carbon dioxide compressor, the turbine and the air compressor are arranged coaxially.

The invention also discloses a working method of the turbine driving gas compression system, which adopts the system to operate and is characterized by comprising the following steps:

s1, boosting a carbon dioxide working medium by a carbon dioxide compressor, dividing the carbon dioxide working medium into two paths, enabling one path of the carbon dioxide working medium to enter a low-temperature regenerator to absorb waste heat of the carbon dioxide working medium discharged by a turbine, and enabling the other path of the carbon dioxide working medium to enter an intercooler to absorb heat of compressed air and cool the compressed air;

s2, combining the two heated carbon dioxide working media, and allowing the two carbon dioxide working media to enter a high-temperature heat regenerator to absorb the waste heat of the carbon dioxide working media discharged by a turbine;

s3, the carbon dioxide working medium heated by the high-temperature heat regenerator enters a heater for further heating, and finally enters a turbine for expansion to do work, and the turbine pushes an air compressor to work;

s4, releasing heat of the carbon dioxide working medium discharged by the turbine through a high-temperature heat regenerator and a low-temperature heat regenerator, releasing heat to air through an air preheater, cooling to normal temperature through a precooler, and returning to a carbon dioxide compressor;

and S5, air preheated by the air preheater enters a first section of an air compressor for pressurization, then enters a first section of an intercooler for cooling, then enters a second section of the air compressor for pressurization, then enters a second section of the intercooler for cooling, then enters a third section of the air compressor for pressurization, then enters a third section of the intercooler for cooling, then enters a fourth section of the air compressor for pressurization, and finally is sent to downstream chemical equipment.

In a preferred embodiment of the invention, the pressure at the outlet of the carbon dioxide compressor in S1 is 15-20 MPa.

In a preferred embodiment of the present invention, the inlet temperature of the turbine of S3 is 450 to 550 ℃.

In a preferred embodiment of the invention, the compression ratio of the first section to the fourth section of the air compressor of S5 is 2-3.

Compared with the prior art, the invention can recover the heat of the air heated after being pressurized by the air compressor and be recycled by the supercritical carbon dioxide, thereby reducing the thermal power of the heater, reducing the heat consumption in the air compression process and saving the production cost, in the supercritical carbon dioxide cycle, if the heat of the indirect cooling of the recovered compressed air is not taken into account, the thermal efficiency of the cycle can reach 50 percent, while the thermal efficiency of the conventional steam turbine unit is about 35 percent, but the power consumption of the air compressor of the invention is higher and is increased by about 10 percent compared with the conventional compression process, thereby the heat consumption in the total air compression process is reduced by about 20 percent.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of the gas compression of the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

Referring to fig. 1, a turbine driven gas compression system is shown, including a carbon dioxide compressor 100, a low temperature regenerator 200, a high temperature regenerator 300, a heater 400, a turbine 500, an air preheater 700, a precooler 600, an intercooler 900, and an air compressor 800.

The carbon dioxide compressor 100 is used for compressing carbon dioxide working medium, the low-temperature heat regenerator 200 is used for heating the carbon dioxide working medium pressurized by the carbon dioxide compressor 100, and a low-temperature side inlet of the low-temperature heat regenerator 200 is communicated with an outlet of the carbon dioxide compressor 100.

The high-temperature regenerator 300 is used for heating the carbon dioxide working medium heated by the low-temperature regenerator 200, a low-temperature side inlet of the high-temperature regenerator 300 is communicated with a low-temperature side outlet of the low-temperature regenerator 200, and a high-temperature side outlet of the high-temperature regenerator 300 is communicated with a high-temperature side inlet of the low-temperature regenerator 200.

The heater 400 is used for further heating the carbon dioxide working medium heated by the high-temperature regenerator 300, an inlet of the heater 400 is communicated with a low-temperature side outlet of the high-temperature regenerator 300, the turbine 500 is used for providing pushing power, an inlet of the turbine 500 is communicated with an outlet of the heater 400, and an outlet of the turbine 500 is communicated with a high-temperature side inlet of the high-temperature regenerator 300.

The air preheater 700 is used for preheating air, a carbon dioxide side inlet of the air preheater 700 is communicated with a high-temperature side outlet of the low-temperature heat regenerator 200, an air inlet of the air preheater 700 is communicated with the outside atmosphere, the precooler 600 is used for further cooling a carbon dioxide working medium cooled by the air preheater 700, an inlet of the precooler 600 is communicated with a carbon dioxide side outlet of the air preheater 700, and an outlet of the precooler 600 is communicated with an inlet of the carbon dioxide compressor 100.

The carbon dioxide side inlet of the intercooler 900 is communicated with the outlet of the carbon dioxide compressor 100, the carbon dioxide side outlet of the intercooler 900 is communicated with the low-temperature side inlet of the high-temperature heat regenerator 300, the air compressor 800 is used for boosting the air by pushing the turbine 500, and the first section inlet of the air compressor 500 is communicated with the air outlet of the air preheater 700.

The first section outlet of the air compressor 800 is communicated with the first section air side inlet of the intercooler 900, the first section air side outlet of the intercooler 900 is communicated with the second section inlet of the air compressor 800, the second section outlet of the air compressor 800 is communicated with the second section air side inlet of the intercooler 900, the second section air side outlet of the intercooler 900 is communicated with the third section inlet of the air compressor 800, the third section outlet of the air compressor 800 is communicated with the third section air side inlet of the intercooler 900, the third section air side outlet of the intercooler 900 is communicated with the fourth section inlet of the air compressor 800, the fourth section outlet of the air compressor 800 is communicated with chemical equipment arranged at the downstream, and in the embodiment, the carbon dioxide compressor 100, the turbine 500 and the air compressor 800 are coaxially arranged.

The invention also discloses a working method of the turbine driving gas compression system, which adopts the system to operate and comprises the following steps:

s1, boosting a carbon dioxide working medium to 18MPa through a carbon dioxide compressor 100, dividing the carbon dioxide working medium into two paths, enabling one path of the carbon dioxide working medium to enter a low-temperature heat regenerator 200 to absorb waste heat of the carbon dioxide working medium discharged by a turbine 500, and enabling the other path of the carbon dioxide working medium to enter an intercooler 900 to absorb heat of compressed air and cool the compressed air;

s2, combining the two heated carbon dioxide working media, and enabling the two heated carbon dioxide working media to enter a high-temperature heat regenerator 300 to absorb the waste heat of the carbon dioxide working media discharged by the turbine 500;

s3, the carbon dioxide working medium heated by the high-temperature heat regenerator 300 enters a heater 400 for further heating, the heating temperature reaches 520 ℃, and finally the carbon dioxide working medium enters a turbine 500 for expansion and work, and the turbine 500 pushes an air compressor 800 to work;

s4, the carbon dioxide working medium discharged by the turbine 500 releases heat through the high-temperature heat regenerator 300 and the low-temperature heat regenerator 200, releases heat to air through the air preheater 700, is cooled to normal temperature through the precooler 600, and finally returns to the carbon dioxide compressor 100;

s5, air preheated by the air preheater 700 enters a first section of an air compressor for pressurization, then enters a first section of an intercooler 900 for cooling, then enters a second section of the air compressor 800 for pressurization, then enters a second section of the intercooler 900 for cooling, then enters a third section of the air compressor 800 for pressurization, then enters a third section of the intercooler 900 for cooling, then enters a fourth section of the air compressor 800 for pressurization, the compression ratio of each section of pressurization is 2.5, the pressure reaching the process requirement is 3.5Mpa, and finally the air is sent to downstream chemical equipment.

In conclusion, the invention can recover the heat quantity of the air heated after being pressurized by the air compressor and recycle the heat quantity by the supercritical carbon dioxide, thereby reducing the thermal power of the heater, reducing the heat consumption in the air compression process and saving the production cost, in the supercritical carbon dioxide cycle, if the heat quantity of the indirect cooling of the recovered compressed air is not taken into account, the thermal efficiency of the cycle can reach 50 percent, while the thermal efficiency of the conventional steam turbine unit is about 35 percent, but the power consumption of the air compressor of the invention is higher and is increased by about 10 percent compared with the conventional compression process, thereby the total heat consumption in the air compression process is reduced by about 20 percent.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.