Compressed air supply system for instrument purification

Abstract

The utility model belongs to the technical field of compressed air supply, and particularly relates to an instrument purification compressed air supply system, which comprises a normal supply unit and an emergency supply unit, and is characterized in that the emergency supply unit comprises a screw air compressor, a high-efficiency degreaser, a micro-heat regeneration air dryer and a second dust fine filter which are connected in sequence; an outlet of the second dust fine filter is communicated with an outlet of the first dust fine filter, and emergency supply for the purified compressed air storage tank for the instrument is completed; a first bleeder and a second control valve are arranged on a pipeline between the screw air compressor and the efficient degreaser, and a first control valve is arranged on the first bleeder; a second diffusing pipe is arranged on a pipeline between the micro-heat regeneration air dryer and the second dust fine filter, a third control valve is arranged on the second diffusing pipe, and a fourth control valve is arranged on an outlet pipeline of the second dust fine filter. Compared with the prior art, the device has the advantages that the device can quickly respond to guarantee the supply of the purified compressed air of the instrument.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressed air supply, and particularly relates to an instrument purifying compressed air supply system. Background Art

[0002] Instrument purifying compressed air is a common power medium and plays an important role in industrial production. Many instruments rely on instrument purifying compressed air to work, such as pressure gauges, control valves, etc. Without the supply of instrument purifying compressed air, many instruments and valves will not be able to work properly, thus affecting the control and monitoring of the production process. Therefore, in industrial production, instrument purifying compressed air is an indispensable important link.

[0003] The Chinese utility model patent with the application number 200820033502.4 discloses an instrument compressed air purification system, which includes an air inlet pipe, an air outlet pipe, a dehumidifier and a dryer, and also includes at least one dust and dirt removal tank and a pressure stabilizing gas storage tank. The bottom of the dust and dirt removal tank and the pressure stabilizing gas storage tank is provided with a blowdown port. The air inlet pipe is connected to the inlet of the dust and dirt removal tank, the outlet of the dust and dirt removal tank is connected to the inlet of the pressure stabilizing gas storage tank, and the outlet of the pressure stabilizing gas storage tank is connected to the air outlet pipe through a series-connected dehumidifier and dryer. Compressed air first enters the dust and dirt removal tank through the air inlet pipe. While expanding in the tank, dust and dirt are deposited, so that the compressed air is purified. Then it enters the pressure stabilizing gas storage tank, thereby suppressing the pressure fluctuation in the pipeline. Then it passes through the dehumidifier and dryer and is output through the air outlet pipe to meet the purity and pressure requirements of the use occasion.

[0004] The Chinese utility model patent with the application number 201110380121.X discloses a shipboard instrument air on-site supply system and method, which mainly includes a compressor, a filter, a drying system, a buffer tank or a high-pressure gas cylinder connected in sequence. The buffer tank or the high-pressure gas cylinder is directly connected to the terminal gas-using point through a stop valve and a pressure regulating valve; an adsorbent capable of increasing the gas quality in the gas storage tank is filled in the high-pressure gas cylinder or the buffer tank without increasing the storage pressure. Under the same conditions, the pressure fluctuation at the gas-using point is reduced, and the supply guarantee time of the on-site arranged gas cylinder is prolonged.

[0005] It can be seen that due to insufficient supply or abnormal fluctuation of instrument purifying compressed air, the occurrence of "instrument dropping" accidents is a common technical problem in the industry. Relevant technical personnel have also made various attempts, but the effects are not satisfactory and cannot be applied to the normal production process of coking plants. Preventing the "instrument dropping" phenomenon is of great significance for realizing safe production. Content of the Utility Model

[0006] The purpose of the present utility model is to provide an instrument purifying compressed air supply guarantee system, which overcomes the deficiencies of the prior art. When the pressure of the instrument purifying compressed air user is insufficient, the screw air compressor and its subsequent purification equipment are automatically started by the control valve to realize the supply guarantee of the instrument purifying compressed air. The screw air compressor is only used for start-up and standby of the instrument purifying compressed air, not used during normal production, and is interlocked and started during accidents, improving production efficiency and energy utilization efficiency and creating good economic benefits.

[0007] To achieve the above purpose, the present utility model is realized through the following technical solutions:

[0008] An instrument purifying compressed air supply guarantee system includes a normal supply unit and an emergency supply unit. The normal supply unit includes an air filter, a centrifugal air compressor, a heat regeneration air dryer, and a first dust fine filter connected in sequence. The air outlet of the first dust fine filter is respectively connected to the compressed air storage tank for production and dust removal and the purified compressed air storage tank for instruments through pipelines. It is characterized in that the emergency supply unit includes a screw air compressor, a high-efficiency oil remover, a micro heat regeneration air dryer, and a second dust fine filter connected in sequence. The outlet of the second dust fine filter is connected to the outlet of the first dust fine filter to complete the emergency supply to the compressed air storage tank for production and dust removal and the purified compressed air storage tank for instruments respectively; a first blow-off pipe and a second control valve are provided on the pipeline between the screw air compressor and the high-efficiency oil remover, and a first control valve is provided on the first blow-off pipe; a second blow-off pipe is provided on the pipeline between the micro heat regeneration air dryer and the second dust fine filter, a third control valve is provided on the second blow-off pipe, and a fourth control valve is provided on the outlet pipeline of the second dust fine filter.

[0009] The air filter is a self-cleaning air filter.

[0010] The high-efficiency oil remover is equipped with a CN01 resin filter element.

[0011] The heat regeneration air dryer has a double-tower structure, which is internally provided with a gas-liquid separator and a cooler. The air inlet of the heat regeneration air dryer is connected to the exhaust outlet of the centrifugal air compressor through a pipeline, and a heater is provided on the pipeline.

[0012] The micro heat regeneration air dryer has a double-tower structure, which is internally provided with an electric heater.

[0013] The first dust fine filter or the second dust fine filter is any one of a two-in-one filter, a three-in-one filter, and a candle filter.

[0014] The actuator of each control valve is any one of an electric valve, a pneumatic valve, and a hydraulic valve.

[0015] The valve of each control valve is any one of a butterfly valve, a gate valve, and a ball valve.

[0016] The set dew point temperature is -40°C.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1) When the instrument air pressure drops, it can automatically start the screw air compressor and its subsequent purification equipment, realizing the emergency supply of purified compressed air for the instrument, avoiding the "pressure drop" accident of the purified compressed air for the instrument, and making the overall production process safe and reliable.

[0019] 2) Under normal working conditions, the heat regeneration air dryer used utilizes the waste heat of the centrifugal air compressor, which is economical and energy-saving, and does not require additional heating sources.

[0020] 3) In the solution, the screw air compressor is only used for start-up and standby of purified compressed air for the instrument. It is not used during normal production and is interlocked to start during accidents. A small-capacity screw air compressor is used instead of a large-capacity centrifugal air compressor. This system plays a positive role in improving production efficiency and energy utilization efficiency and can create good economic benefits. Description of the Drawings

[0021] Figure 1 It is the process flow structure diagram of the embodiment of the present utility model.

[0022] In the figure: 1 - self-cleaning air filter, 2 - centrifugal air compressor, 3 - heat regeneration air dryer, 4 - first dust fine filter, 5 - compressed air storage tank for production and dust removal, 6 - screw air compressor, 7 - first control valve, 8 - second control valve, 9 - high-efficiency oil remover, 10 - micro heat regeneration air dryer, 11 - third control valve, 12 - second dust fine filter, 13 - fourth control valve, 14 - purified compressed air storage tank for instrument use. Specific Embodiments

[0023] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with specific embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0024] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the specific embodiments required for use in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other specific embodiments can also be obtained based on these specific embodiments.

[0025] The components of the embodiments of the present utility model described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the specific embodiments is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model.

[0026] See Figure 1 , which is a process flow structure diagram of an embodiment of an instrument purification compressed air supply and guarantee system of the present utility model, including a normal supply unit and an emergency supply unit. The normal supply unit includes a self-cleaning air filter 1, a centrifugal air compressor 2, a heat regeneration air dryer 3, and a first dust fine filter 4 connected in sequence. The air outlet of the first dust fine filter 4 is respectively connected to a production and dust removal compressed air storage tank 5 and an instrument purification compressed air storage tank 14 through pipelines. The emergency supply unit includes a screw air compressor 6, a high-efficiency oil remover 9, a micro-heat regeneration air dryer 10, and a second dust fine filter 12 connected in sequence. The outlet of the second dust fine filter 12 is connected to the outlet of the first dust fine filter 4 to complete emergency supply to the production and dust removal compressed air storage tank 5 and the instrument purification compressed air storage tank 14 respectively. A first blow-off pipe and a second control valve 8 are provided on the pipeline between the screw air compressor 6 and the high-efficiency oil remover 9, and a first control valve 7 is provided on the first blow-off pipe. A second blow-off pipe is provided on the pipeline between the micro-heat regeneration air dryer 10 and the second dust fine filter 12, a third control valve 11 is provided on the second blow-off pipe, and a fourth control valve 13 is provided on the outlet pipeline of the second dust fine filter 12. During normal production, the atmosphere is filtered by the self-cleaning air filter 1 and then enters the centrifugal air compressor 2. The centrifugal air compressor 2 continuously sends the compressed gas into the heat regeneration air dryer 3 to dry the compressed air. The dried purified compressed air removes the possible solid particles in the compressed air through the No. 1 dust fine filter 4. The purified compressed air after the above purification treatment is divided into two paths. One path is supplied to the production and dust removal compressed air users after passing through the production and dust removal purified compressed air storage tank 5, and the other path is supplied to the instrument purification compressed air users after passing through the instrument purification compressed air storage tank 14.

[0027] When the pressure fluctuates greatly during production and a "meter dropping" accident occurs, the emergency supply unit is interlocked and started. The starting sequence is:

[0028] 1) When the pressure in the instrument purification compressed air storage tank 14 is lower than 0.45 MPa, the first control valve 7 is opened. When the instrument purification compressed air pressure is lower than 0.45 MPa for 30 s, the screw air compressor 6 is started;

[0029] 2) When the pressure of the instrument purifying compressed air is lower than 0.45 MPa for 60 s continuously, the first control valve 7 closes, and the discharge of unqualified compressed air in the screw air compressor 6 is completed;

[0030] 3) When the air pressure at the outlet of the screw air compressor is higher than 0.5 MPa, the second control valve 8, the micro heat regenerative air dryer 10 and the third control valve 11 are opened simultaneously, and the discharge of unqualified compressed air in the micro heat regenerative air dryer 10 is completed;

[0031] 4) When the dew point temperature of the dew point meter on the micro heat regenerative air dryer ≤ the set dew point temperature (-40 °C), the third control valve 11 closes and the fourth control valve 13 is opened sequentially to realize the emergency supply to the dust removal compressed air storage tank 5 and the instrument purifying compressed air storage tank 14. After the atmosphere is inhaled by the screw air compressor 6, the compressed gas is continuously sent out by the continuous rotation of the screw, enters the high-efficiency oil separator 9 to remove the dirt and oil in the compressed air, and then enters the micro heat regenerative air dryer 10 for further drying treatment. The dried purified compressed air passes through the No. 2 dust fine filter 12 to remove the possible solid particles in the compressed air, and is supplied to the instrument purifying compressed air users after passing through the instrument purifying compressed air storage tank 14.

[0032] In the technical solution of the present utility model, the screw air compressor 6 in the emergency supply unit is only used for startup and standby of instrument air, not used during normal production, and is interlocked and started during an accident. Through the above interlocked startup, the supply of the instrument purifying compressed air is realized.

[0033] In the embodiment, the high-efficiency oil separator is equipped with a CN01 resin filter element. The waste heat regenerative air dryer is of a double-tower structure, which is internally provided with a gas-liquid separator and a cooler. The air inlet of the waste heat regenerative air dryer is connected to the exhaust port of the centrifugal air compressor through a pipeline, and a temperature riser is provided on the pipeline. The micro heat regenerative air dryer is of a double-tower structure, which is internally provided with an electric heater. The first dust fine filter and the second dust fine filter are both two-in-one filters. The actuators of each control valve are all electric valve discs.

[0034] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An instrument purification compressed air supply system, comprising a normal supply unit and an emergency supply unit, wherein the normal supply unit comprises an air filter, a centrifugal air compressor, a waste heat regeneration air dryer and a first dust fine filter connected in sequence, and the air outlet of the first dust fine filter is connected to a production and dust removal compressed air storage tank and an instrument purification compressed air storage tank through pipelines, characterized in that: The emergency supply unit includes a screw air compressor, a high-efficiency oil remover, a micro-heat regeneration air dryer and a second dust fine filter which are connected in sequence, and the outlet of the second dust fine filter is connected to the outlet of the first dust fine filter, respectively completing the emergency supply to the compressed air storage tanks for production and dust removal and the purified compressed air storage tanks for instruments; a first vent pipe and a second control valve are provided on the pipeline between the screw air compressor and the high-efficiency oil remover, and the first vent pipe is provided with a first control valve; a second vent pipe is provided on the pipeline between the micro-heat regeneration air dryer and the second dust fine filter, and a third control valve is provided on the second vent pipe, and a fourth control valve is provided on the outlet pipeline of the second dust fine filter.

2. The instrument purification compressed air supply system according to claim 1 is characterized in that: The air filter is a self-cleaning air filter.

3. The instrument purification compressed air supply system according to claim 1 is characterized in that: The high-efficiency oil remover is equipped with a CN01 resin filter element.

4. The instrument purification compressed air supply system according to claim 1 is characterized in that: The waste heat regeneration air dryer is a double-tower structure, which is equipped with a gas-liquid separator and a cooler. The air inlet of the waste heat regeneration air dryer is connected to the exhaust port of the centrifugal air compressor through a pipeline, and a temperature booster is provided on the pipeline.

5. The instrument purification compressed air supply system according to claim 1 is characterized in that: The micro-heat regeneration air dryer is a double-tower structure with a built-in electric heater.

6. The instrument purification compressed air supply system according to claim 1 is characterized in that: The first dust fine filter or the second dust fine filter is any one of a two-in-one filter, a three-in-one filter, and a candle filter.

7. The instrument purification compressed air supply system according to claim 1 is characterized in that: The actuator of each control valve is any one of an electric valve, a pneumatic valve and a hydraulic valve.

8. The instrument purification compressed air supply system according to claim 1 is characterized in that: The valve of each control valve is any one of a butterfly valve, a gate valve and a ball valve.

9. The instrument purification compressed air supply system according to claim 1, characterized in that: The micro-heat regeneration air dryer is provided with a dew point meter, and the dew point temperature is set at -40°C.

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