CN206404548U - A kind of optimization compressed air drying system based on coagulating type heat exchanger - Google Patents

Abstract

The utility model discloses an optimized compressed air drying system based on a condensing heat exchanger. The system includes an air compressor, a main road system and a bypass system. The bypass system mainly includes a valve A, a reheater, a condensing heat exchanger Heater, wherein the shell-side outlet of the reheater is connected to the shell-side inlet of the condensing heat exchanger, the shell-side outlet of the condensing heat exchanger is connected to the tube-side inlet of the reheater, and the tube-side outlet of the reheater is connected to the The gas system I that does not require high dry air quality is connected; the main road system mainly includes valve B, cooler, water removal filter, oil removal filter, micro heat regenerative adsorption dryer, dust removal filter, and from front to back They are connected in sequence, and finally connected to the gas system II which requires higher dry air quality. By adding a bypass system, the utility model has the characteristics of saving power consumption of micro-heat regenerative adsorption dryer, reducing the frequency of adsorbent replacement and reducing pipeline resistance, so as to ensure the economical, safe and stable operation of the system.

Description

An optimized compressed air drying system based on condensation heat exchanger

technical field

The utility model relates to a compressed air drying system, in particular to an optimized compressed air drying system based on a condensation heat exchanger.

Background technique

The compressed air system of a thermal power plant is an indispensable public system in a thermal power plant. Its main function is to provide gas for instrument control, maintenance, and ash removal and transportation, which directly affects the safe and reliable operation of the entire unit. Especially the instrument compressed air system is related to whether the pneumatic valve actuator can operate normally and affects the safe operation of the entire thermal power plant. The entire plant needs compressed air in professional fields such as heat engine, heat control, ash removal, desulfurization, etc. The amount, quality and use time of compressed air in each field are different. The compressed air provided by the compressed air system for maintenance and instrumentation needs to meet different standards: (1) The air system for maintenance is used for the operation of mechanical equipment, pneumatic tools, etc. Regardless of the mode of operation and equipment maintenance of the thermal power plant, the compressed air of the system is required. (2) The instrument air system provides clean, oil-free, and water-free compressed air to all pneumatically operated instruments and control equipment (such as pneumatically operated valves, etc.).

At present, many thermal power plants use a large amount of gas, which causes the low-heat regenerative adsorption dryer to be in a high-load working state for a long time. The moisture in the compressed air cannot be fully absorbed, and the dew point of the finished gas is too high. In order to prevent the adsorbent from failing due to long-term overload work, the thermal power plant needs to replace the adsorbent regularly. This work consumes manpower and material resources. In addition, a large amount of compressed air passes through the micro-heat regenerative adsorption dryer, which increases the air resistance of the system. In addition, most of the micro-heat regenerative adsorption dryers in thermal power plants use electric heaters, which increase the consumption of electricity due to the large amount of gas consumption.

In order to solve the above problems, the utility model proposes an optimized compressed air drying system based on a condensation heat exchanger. This system adds a bypass to the current common compressed air drying system containing a micro-heat regenerative adsorption dryer. system, part of the air compressed by the air compressor flows through the newly added bypass system, and produces dry air with low humidity content through the shell side of the reheater, the condensation heat exchanger, and the tube side of the reheater for supply Maintenance, transportation and other gas systems that do not require high dry air quality, the reheater does not need to introduce an external heat source; the other part flows through the main road cooler, water removal filter, oil removal filter, micro heat regeneration adsorption type The dryer and post-installed dust filter produce dry air with lower moisture content, which can be used by gas-consuming systems such as instruments that require high dry air quality. This system has the characteristics of saving electricity consumption of micro-heat regenerative adsorption dryer, reducing the frequency of adsorbent replacement, reducing pipeline resistance and not needing to introduce additional external heat sources, so as to ensure the economical, safe and stable operation of the system.

Contents of the invention

In view of this, the utility model provides an optimized compressed air drying system based on a condensation heat exchanger.

In order to solve the above problems, the technical solution adopted by the utility model is: an optimized compressed air drying system based on a condensing heat exchanger, which consists of an air compressor (1), a main road system (13) and a newly added bypass road system (14);

The main road system (13) includes valve B (7), pre-cooler (8), water removal filter (9), oil removal filter (10), micro heat regenerative adsorption dryer (11) , dust removal filter (12), and connected in sequence from front to back;

The bypass system (14) includes a valve A (2), a reheater (3), and a condensing heat exchanger (6), wherein the shell side outlet of the reheater (3) is connected to the condensing heat exchanger ( 6) is connected to the shell-side inlet, and the shell-side outlet of the condensing heat exchanger (6) is connected to the tube-side inlet of the reheater (3).

In the main circuit system (13) and the bypass system (14), the amount of compressed air flowing through these two branch circuits is controlled and distributed by valve A (2) and valve B (7).

The hot fluid of the reheater (3) is the compressed air flowing out from the air compressor, and a small amount of condensed water precipitated after the compressed air is lowered in temperature flows out through the valve C (4), and the cold fluid is the The secondary cooled compressed air flowing out of the shell side outlet of the heater (6).

In the condensing heat exchanger (6), the hot fluid is the compressed air after primary cooling flowing out from the shell side outlet of the reheater (3), wherein the condensed water precipitated after the compressed air lowers its temperature passes through the valve D ( 5) Outflow, the cold fluid is cold water or cold air.

In the bypass system (14), the compressed air passes through the dry compressed air produced by the side outlet of the reheater (3) in the bypass system (14), and is transported through the pipeline to the gas consumption that does not require high quality of dry air. System I.

The micro-heat regenerative adsorption dryer (11) includes two drying towers connected in parallel, and the two work alternately.

The main road system (13), the dry compressed air produced after passing through the post-installed dust filter (12) in the main road system, is transported through pipelines to the air consumption system II which requires higher dry air quality.

Compared with the prior art, the utility model has the following advantages: the system is added with a bypass system in the current common compressed air drying system containing a micro-heat regenerative adsorption dryer, and it is suitable for instruments and the like that have higher requirements on the quality of dry air. In the gas system, the dry air is still generated by the main circuit system behind the air compressor, while the gas system with relatively low requirements for dry air quality such as maintenance and transportation, the dry air is generated by the bypass system behind the air compressor . After the bypass system is added, according to the gas consumption data of each gas consumption system, the compressed air volume of the two routes is distributed by controlling the valve opening of the main road and the bypass inlet end, thereby reducing the drying burden of the main road and realizing micro-heat regeneration The goal is to reduce the power consumption of the adsorption dryer, reduce the frequency of adsorbent replacement, and reduce the resistance of the pipeline, and the design of the reheater in the bypass system does not need to introduce additional external heat sources. Compared with the introduction of external heat sources, this system reduces the transformation cost. The economical, safe and stable operation of the system is guaranteed.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail;

Figure 1 is an optimized compressed air drying system based on a condensation heat exchanger.

detailed description

As shown in Figure 1, the utility model system consists of an air compressor (1), a main road system (13) and a newly added bypass system (14);

The main road system (13) includes valve B (7), pre-cooler (8), water removal filter (9), oil removal filter (10), micro heat regenerative adsorption dryer (11) , dust removal filter (12), and connected in sequence from front to back;

The bypass system (14) includes a valve A (2), a reheater (3), and a condensing heat exchanger (6), wherein the shell side outlet of the reheater (3) is connected to the condensing heat exchanger ( 6) is connected to the shell-side inlet, and the shell-side outlet of the condensing heat exchanger (6) is connected to the tube-side inlet of the reheater (3).

In the main circuit system (13) and the bypass system (14), the amount of compressed air flowing through these two branch circuits is controlled and distributed by valve A (2) and valve B (7).

The hot fluid of the reheater (3) is the compressed air flowing out from the air compressor, and a small amount of condensed water precipitated after the compressed air is lowered in temperature flows out through the valve C (4), and the cold fluid is the The secondary cooled compressed air flowing out of the shell side outlet of the heater (6).

In the condensing heat exchanger (6), the hot fluid is the compressed air after primary cooling flowing out from the shell side outlet of the reheater (3), wherein the condensed water precipitated after the compressed air lowers its temperature passes through the valve D ( 5) Outflow, the cold fluid is cold water or cold air.

In the bypass system (14), the compressed air passes through the dry compressed air produced by the side outlet of the reheater (3) in the bypass system (14), and is transported through the pipeline to the gas consumption that does not require high quality of dry air. System I.

The micro-heat regenerative adsorption dryer (11) includes two drying towers connected in parallel, and the two work alternately.

The main road system (13), the dry compressed air produced after passing through the post-installed dust filter (12) in the main road system, is transported through pipelines to the air consumption system II which requires higher dry air quality.

As shown in Figure 1, after the air compressor (1), the compressed air channel is divided into two branches, the main road and the bypass.

In the newly added bypass system, the compressed air flows through the valve A (2), the shell side of the reheater (3), the condensing heat exchanger (6), and the tube side of the reheater (3). The dry air produced here can be used for maintenance and other gas systems that require relatively low dry air quality. The compressed air first flows through the shell side of the reheater (3), as a thermal fluid, the temperature in the reheater is lowered to a certain extent, and a small amount of condensed water is precipitated, and the cooled compressed air flows out from the outlet of the shell side, and a small amount of condensed water passes through Valve C (4) is introduced into the water circulation system for utilization; while the cold fluid of the reheater (3) is the secondary cooled compressed air flowing out from the shell side of the condensing heat exchanger (6), and the cold fluid from the reheater (3) The tube side flows through, and the temperature rises to a certain level in the reheater, and the relative humidity decreases, and flows out from the tube side of the reheater to form dry air. The primary cooled compressed air generated after passing through the shell side of the reheater flows in from the shell side inlet of the condensing heat exchanger (6), and is used as the thermal fluid of the condensing heat exchanger in the condensing heat exchanger (6) ) to release heat, reduce the temperature to a certain extent, and precipitate a large amount of condensed water, which flows out from the outlet of the shell side of the condensation heat exchanger (6), generates secondary cooled compressed air, and introduces it into the tube side of the reheater (3), The precipitated condensed water is introduced into the water circulation system through the valve D (5) for utilization; the cold fluid of the condensing heat exchanger (6) flows through its tube side, which can be cold water or cold air introduced into the system from the outside, or the cold water or cold air. The flow rate and temperature can be adjusted according to gas requirements.

In the main road, compressed air flows through valve B (7), pre-cooler (8), water removal filter (9), oil removal filter (10), micro heat regenerative adsorption dryer (11), The dust removal filter (12) finally produces dry air with extremely low moisture content. The dry compressed air produced here can satisfy all gas consumption systems, including instrument gas and other gas consumption systems that have high requirements for dry air quality. During the working process of the main road, the micro-heat regenerative adsorption dryer (11) includes two drying towers, which are connected in parallel and work alternately. When one drying tower absorbs moisture in the compressed air, the other drying tower uses part of the drying Compressed air regenerates the adsorbent, and vice versa, the functions of the two are reversed. Since the regeneration efficiency of the drying capacity of the adsorbent will decrease after long-term use, it is necessary to replace the adsorbent in the drying tower regularly.

According to the statistics of gas consumption data of each gas consumption system, according to the consumption ratio of dry compressed air of different quality, by controlling the opening degree of the valve A (2) at the inlet end of the bypass and the valve B (7) at the inlet end of the main road, the compressed air volume of the two roads to allocate.

The above-mentioned embodiments are not limitations to the present utility model, and the present utility model is not limited to the above-mentioned examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the technical solutions of the present utility model are also acceptable. All belong to the protection scope of the present utility model.

Claims (7)

1. An optimized compressed air drying system based on a condensation heat exchanger, which consists of an air compressor (1), a main system (13) and a bypass system (14); The main road system (13) includes valve B (7), pre-cooler (8), water removal filter (9), oil removal filter (10), micro heat regenerative adsorption dryer (11) , dust removal filter (12), and connected in sequence from front to back; The bypass system (14) includes a valve A (2), a reheater (3), and a condensing heat exchanger (6), wherein the shell side outlet of the reheater (3) is connected to the condensing heat exchanger ( 6) is connected to the shell-side inlet, and the shell-side outlet of the condensing heat exchanger (6) is connected to the tube-side inlet of the reheater (3). 2. The optimized compressed air drying system based on condensing heat exchanger according to claim 1, characterized in that: said main road system (13) and bypass system (14) flow through these two branches The amount of compressed air is controlled and distributed by valve A (2) and valve B (7). 3. The optimized compressed air drying system based on condensing heat exchanger according to claim 1, characterized in that: the hot fluid of the reheater (3) is the compressed air flowing out from the air compressor, compressed A small amount of condensed water precipitated after the air temperature is lowered flows out through the valve C (4), and the cold fluid is the secondary cooled compressed air flowing out from the outlet of the shell side of the condensing heat exchanger (6). 4. The optimized compressed air drying system based on condensing heat exchanger according to claim 1, characterized in that: in the condensing heat exchanger (6), the hot fluid is from the shell of the reheater (3) The primary cooled compressed air flowing out of the side outlet, in which the condensed water precipitated after the compressed air is lowered in temperature, flows out through the valve D (5), and the cold fluid is cold water or cold air. 5. The optimized compressed air drying system based on condensing heat exchanger according to claim 1, characterized in that: said bypass system (14), the compressed air passes through the reheater ( 3) The dry compressed air produced at the outlet of the pipe side is transported through the pipeline to the gas consumption system I which does not require high quality of dry air. 6. The optimized compressed air drying system based on condensation heat exchanger according to claim 1, characterized in that: the micro-heat regenerative adsorption dryer (11) includes two parallel drying towers, both Work alternately. 7. The optimized compressed air drying system based on condensation heat exchanger according to claim 1, characterized in that: the main road system (13) is produced after passing through the post-installed dust filter (12) in the main road. The dry compressed air is transported through the pipeline to the gas system II which requires higher dry air quality.