CN219399556U - Waste heat utilization system of air compressor - Google Patents
Waste heat utilization system of air compressor Download PDFInfo
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- CN219399556U CN219399556U CN202320416310.6U CN202320416310U CN219399556U CN 219399556 U CN219399556 U CN 219399556U CN 202320416310 U CN202320416310 U CN 202320416310U CN 219399556 U CN219399556 U CN 219399556U
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Abstract
The utility model relates to a waste heat utilization system of an air compressor, which comprises a molecular sieve adsorption system, a compressed air heat exchange system and a regenerated gas pipeline system; the molecular sieve adsorption system comprises a first molecular sieve adsorption tower, a second molecular sieve adsorption tower, a third molecular sieve adsorption tower and a fourth molecular sieve adsorption tower which are arranged in parallel, wherein the tops of the first molecular sieve adsorption tower, the second molecular sieve adsorption tower, the third molecular sieve adsorption tower and the fourth molecular sieve adsorption tower are connected with a compressed air outlet flow path and a regenerated gas outlet flow path, and the bottoms of the first molecular sieve adsorption tower, the second molecular sieve adsorption tower, the third molecular sieve adsorption tower and the fourth molecular sieve adsorption tower are connected with a compressed air inlet flow path, a cold blowing flow path, a preheating air flow path and a high-temperature air flow path. The utility model recycles the waste heat of the compressed air of the air compressor, and greatly reduces the electricity consumption and the carbon emission for the air separation device.
Description
Technical Field
The utility model relates to a waste heat utilization system, in particular to a waste heat utilization system of an air compressor, and belongs to the technical field of waste heat recovery of air compressors.
Background
The development of air separation technology has been in the past for over one hundred years, and the industrial technology for separating each component gas in the air and producing oxygen, nitrogen, argon and other gases is widely applied to the processes of industrial production, medical treatment and the like.
The air separation equipment sequentially mainly comprises an air compressor, an air cooling system, a purification system, a rectification system and a part of auxiliary systems, namely raw material air is pressurized to 0.4-0.6MPa through an air compressor, and enters a rectification tower of an air separation cooling box for air separation after being subjected to air precooling and molecular sieve adsorber purification; the molecular sieve absorber absorbs water, carbon dioxide and other impurities in the air by utilizing the adsorption of the molecular sieve, when the molecular sieve absorber absorbs the impurities to be saturated, the molecular sieve is used for resolving the adsorbed water and carbon dioxide by heating, then the adsorbed water and carbon dioxide are blown out of the molecular sieve absorber by cold blowing, a cooler is not arranged at the final stage of the air compressor (for example, an oil-free screw air compressor unit can generate high-temperature compressed air with the temperature of 180 ℃), the compressed air is cooled to a proper temperature by an air cooling tower of an air cooling system and then enters a purification system, heat in the compressed air is wasted, and in addition, heat is consumed by heating regenerated gas in the regeneration process of the purification system.
In addition, the existing purification system mostly adopts a two-tower pressure swing adsorption mode, because the two towers are adopted for adsorption, the size of the molecular sieve adsorption tower is larger, so that the molecular sieve in the molecular sieve adsorption tower is more in filling quantity, the problems of longer molecular sieve replacement period, high labor intensity of workers and more quantity and higher cost are caused by more molecular sieve replacement, in addition, the molecular sieve is pulverized under the conditions of overlong pressurizing time and temperature abrupt change and heating in the regeneration process, and the molecular sieve adsorption effect is influenced.
Disclosure of Invention
The utility model mainly aims at the problems existing in the prior art and provides a waste heat utilization system of an air compressor; according to the characteristics of the molecular sieve and the characteristics of the air compressor generating a large amount of heat in the operation process, the system recycles the waste heat of the air compressor from the angles of energy conservation and emission reduction, effectively reduces the heat loss of the air compressor in equipment in the operation process, reduces the consumption of circulating water flow, simultaneously reduces the electricity consumption of electric heating, meets the requirements of energy conservation and emission reduction, and greatly reduces the electricity consumption and carbon emission for the air separation device.
The aim of the utility model is mainly achieved by the following scheme:
a waste heat utilization system of an air compressor comprises a molecular sieve adsorption system, a compressed air heat exchange system and a regenerated gas pipeline system; the molecular sieve adsorption system comprises a first molecular sieve adsorption tower, a second molecular sieve adsorption tower, a third molecular sieve adsorption tower and a fourth molecular sieve adsorption tower which are arranged in parallel, wherein the tops of the first molecular sieve adsorption tower, the second molecular sieve adsorption tower, the third molecular sieve adsorption tower and the fourth molecular sieve adsorption tower are connected with a compressed air outlet flow path and a regenerated gas outlet flow path, and the bottoms of the first molecular sieve adsorption tower, the second molecular sieve adsorption tower, the third molecular sieve adsorption tower and the fourth molecular sieve adsorption tower are connected with a compressed air inlet flow path, a cold blowing flow path, a preheating air flow path and a high-temperature air flow path; the compressed air heat exchange system comprises an air compressor, a first-stage heat exchanger, a second-stage heat exchanger, a third-stage heat exchanger, a fourth-stage heat exchanger and a compressed air heat exchange flow path, wherein an outlet of the air compressor is communicated with the compressed air heat exchange flow path, and the compressed air heat exchange flow path is communicated with a compressed air inlet flow path after sequentially passing through the first-stage heat exchanger, the second-stage heat exchanger, the third-stage heat exchanger and the fourth-stage heat exchanger; the regenerated gas pipeline system comprises a regenerated gas main pipe, a first regenerated gas branch pipe, a second regenerated gas branch pipe, a third regenerated gas branch pipe and an electric heater, wherein an outlet of the regenerated gas main pipe is connected with the first regenerated gas branch pipe and the second regenerated gas branch pipe respectively, the first regenerated gas branch pipe is communicated with a cold blowing air flow path, the second regenerated gas branch pipe is divided into two paths after passing through a second-stage heat exchanger, the first path branch pipe is communicated with a preheating air flow path, and the second path branch pipe is communicated with a high-temperature air flow path after passing through a first-stage heat exchanger and the electric heater.
Preferably, the compressed air intake flow path includes a first compressed air intake flow path connected to the first molecular sieve adsorption tower, a seventh compressed air intake flow path connected to the second molecular sieve adsorption tower, a thirteenth compressed air intake flow path connected to the third molecular sieve adsorption tower, and a nineteenth compressed air intake flow path connected to the fourth molecular sieve adsorption tower; the compressed air outlet flow path comprises a second compressed air outlet flow path connected with the first molecular sieve adsorption tower, an eighth compressed air outlet flow path connected with the second molecular sieve adsorption tower, a fourteenth compressed air outlet flow path connected with the third molecular sieve adsorption tower and a twentieth compressed air outlet flow path connected with the fourth molecular sieve adsorption tower; valves are arranged on the flow path pipelines.
Preferably, the cold blow air flow path comprises a third cold blow air flow path connected with the first molecular sieve adsorption tower, a ninth cold blow air flow path connected with the second molecular sieve adsorption tower, a fifteenth cold blow air flow path connected with the third molecular sieve adsorption tower and a twenty-first cold blow air flow path connected with the fourth molecular sieve adsorption tower; the preheating airflow path comprises a fifth preheating airflow path connected with the first molecular sieve adsorption tower, an eleventh preheating airflow path connected with the second molecular sieve adsorption tower, a seventeenth preheating airflow path connected with the third molecular sieve adsorption tower and a twenty third preheating airflow path connected with the fourth molecular sieve adsorption tower; the high-temperature gas flow path comprises a sixth high-temperature gas flow path connected with the first molecular sieve adsorption tower, a twelfth high-temperature gas flow path connected with the second molecular sieve adsorption tower, an eighteenth high-temperature gas flow path connected with the third molecular sieve adsorption tower and a twenty-fourth high-temperature gas flow path connected with the fourth molecular sieve adsorption tower; the regenerated gas outlet flow path comprises a fourth regenerated gas outlet flow path connected with the first molecular sieve adsorption tower, a tenth regenerated gas outlet flow path connected with the second molecular sieve adsorption tower, a sixteenth regenerated gas outlet flow path connected with the third molecular sieve adsorption tower and a twenty second regenerated gas outlet flow path connected with the fourth molecular sieve adsorption tower; valves are arranged on the flow path pipelines.
Preferably, an eleventh thermometer is installed on the regenerated gas main pipe, a first control valve and a first flowmeter are sequentially installed on a pipeline before the second regenerated gas branch pipe flows through the second-stage heat exchanger, the first control valve and the first flowmeter are electrically connected, a second control valve is installed on a pipeline of the first branch pipe, a second flowmeter is installed on a pipeline before the second branch pipe flows through the first-stage heat exchanger, the second control valve and the second flowmeter are electrically connected, a ninth thermometer and a tenth thermometer are sequentially installed on a pipeline after the second branch pipe flows through the first-stage heat exchanger, and an electric heater is located between the ninth thermometer and the tenth thermometer.
Preferably, the twelfth thermometer is arranged after the compressed air heat exchange flow path flows through the three-stage heat exchanger, the three-stage heat exchanger adopts a gas-water heat exchanger, and the inlet of the cooling water pipeline is provided with a regulating valve which is electrically connected with the twelfth thermometer.
Preferably, the bottom and the top of the first molecular sieve adsorption tower are respectively provided with a first thermometer and a second thermometer, the bottom and the top of the second molecular sieve adsorption tower are respectively provided with a third thermometer and a fourth thermometer, the bottom and the top of the third molecular sieve adsorption tower are respectively provided with a fifth thermometer and a sixth thermometer, and the bottom and the top of the fourth molecular sieve adsorption tower are respectively provided with a seventh thermometer and an eighth thermometer.
Preferably, the top parts of the first molecular sieve adsorption tower, the second molecular sieve adsorption tower, the third molecular sieve adsorption tower and the fourth molecular sieve adsorption tower are also respectively provided with a first pressure gauge, a second pressure gauge, a third pressure gauge and a fourth pressure gauge.
Preferably, a twenty-ninth pressure equalizing flow path is connected between the top of the first molecular sieve adsorption tower and the top of the second molecular sieve adsorption tower, a thirty-first pressure equalizing flow path is connected between the top of the second molecular sieve adsorption tower and the top of the third molecular sieve adsorption tower, a thirty-second pressure equalizing flow path is connected between the top of the third molecular sieve adsorption tower and the top of the fourth molecular sieve adsorption tower, and a thirty-second pressure equalizing flow path is connected between the top of the fourth molecular sieve adsorption tower and the top of the first molecular sieve adsorption tower; valves are arranged on the flow path pipelines.
Preferably, the twenty-ninth pressure equalizing flow path, the thirty-first pressure equalizing flow path, and the thirty-second pressure equalizing flow path are further provided with a twenty-fifth pressure equalizing valve, a twenty-sixth pressure equalizing valve, a twenty-seventh pressure equalizing valve, and a twenty-eighth pressure equalizing valve, respectively.
Therefore, compared with the prior art, the utility model has the following advantages:
(1) According to the utility model, the regenerated gas absorbs heat through the primary heat exchanger and the secondary heat exchanger, so that the power consumption of the electric heater is reduced, the load of the tertiary heat exchanger is reduced, the heat emission to the environment is reduced, and the circulating water quantity is reduced;
(2) According to the utility model, the four molecular sieve adsorption towers work in parallel, so that the filling amount of molecular sieve adsorbents in the adsorption towers is reduced, the volume of the molecular sieve adsorption towers can be further reduced, the running cost is reduced, the resistance of compressed gas and regenerated gas entering the towers is reduced, and the energy consumption of the air compressor is reduced;
(3) The resistance of the regenerated gas entering the tower is reduced, the fluctuation of the pressure in the tower is small or no fluctuation exists, the stable operation in the tower is facilitated, and the influence on the purity when the molecular sieve adsorption tower is switched to fluctuation is particularly solved;
(4) The molecular sieve adsorption tower is provided with a preheating process, so that the molecular sieve pulverization phenomenon caused by abrupt temperature rise of the molecular sieve adsorption tower is avoided, and the service life of the molecular sieve adsorption tower is prolonged;
(5) In the utility model, the molecular sieve adsorption tower has the advantages that the flow direction of other gases is consistent except for the pressure equalizing process, the phenomenon that the air flow rolls up and down is avoided, and the adsorption effect is prevented from being influenced;
(6) The utility model recycles the waste heat of the air compressor, effectively reduces the heat loss of the air compressor in equipment in the running process, reduces the consumption of circulating water flow, simultaneously reduces the electricity consumption of the electric heater, meets the requirements of energy conservation and emission reduction, and greatly reduces the electricity consumption and carbon emission for the air separation device.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Illustration of: MS 1201-a first molecular sieve adsorption tower, MS 1202-a second molecular sieve adsorption tower, MS 1203-a third molecular sieve adsorption tower, MS 1204-a fourth molecular sieve adsorption tower;
AC 1001-air compressor, E1-primary heat exchanger, E2-secondary heat exchanger, E3-tertiary heat exchanger, E4-quaternary heat exchanger and EH-1201;
v1-a first compressed air inlet flow path, V2-a second compressed air outlet flow path, V3-a third cold blowing flow path, V4-a fourth regenerated gas outlet flow path, V5-a fifth preheated air flow path, V6-a sixth high temperature air flow path, V7-a seventh compressed air inlet flow path, V8-an eighth compressed air outlet flow path, V9-a ninth cold blowing flow path, V10-a tenth regenerated gas outlet flow path, V11-an eleventh preheated air flow path, V12-a twelfth high temperature air flow path, V13-a thirteenth compressed air inlet flow path, V14-a fourteenth compressed air outlet flow path, V4-a fifteenth cold blowing flow path, V16-a sixteenth regenerated gas outlet flow path, V17-a seventeenth preheated air flow path, V18-an eighteenth high temperature air flow path, V19-a nineteenth compressed air inlet flow path, V20-a twenty-eighth compressed air flow path, V21-a twenty first cold air flow path, V22-twenty second regenerated gas outlet flow path, V23-twenty-thirteenth preheated air flow path, V24-twenty fourth high temperature air flow path;
HV 25-twenty-fifth pressure equalizing valve, HV 26-twenty-sixth pressure equalizing valve, HV 27-twenty-seventh pressure equalizing valve, HV 28-twenty-eighth pressure equalizing valve, V29-twenty-ninth pressure equalizing flow path, V30-thirty-first pressure equalizing flow path, V31-thirty-second pressure equalizing flow path;
TIS 1201-first thermometer, TIS 1202-second thermometer, TIS 1203-third thermometer, TIS 1204-fourth thermometer, TIS 1205-fifth thermometer, TIS 1206-sixth thermometer, TIS 1207-seventh thermometer, TIS 1208-eighth thermometer, TIS 1209-ninth thermometer, TIS 1210-tenth thermometer, TI 101-eleventh thermometer, TI 102-twelfth thermometer;
FCV 1201-first control valve, FCV 1202-second control valve, TCV 101-regulator valve;
FI 1201-first flow meter, FI 1202-second flow meter;
PIS 1201-first pressure gauge, PIS 1202-second pressure gauge, PIS 1203-third pressure gauge, PIS 1204-fourth pressure gauge.
Detailed Description
The technical scheme of the utility model is further specifically described below through specific embodiments and with reference to the accompanying drawings. It should be understood that the practice of the utility model is not limited to the following examples, but is intended to be within the scope of the utility model in any form and/or modification thereof.
In the present utility model, unless otherwise specified, all parts and percentages are by weight, and the equipment, materials, etc. used are commercially available or are conventional in the art. The methods in the following examples are conventional in the art unless otherwise specified. The components and devices in the following examples are, unless otherwise indicated, all those components and devices known to those skilled in the art, and their structures and principles are known to those skilled in the art from technical manuals or by routine experimentation.
As shown in fig. 1, the utility model provides a technical scheme, namely a waste heat utilization system of an air compressor, which consists of a molecular sieve adsorption system, a compressed air heat exchange system and a regenerated gas pipeline system.
Specifically, the molecular sieve adsorption system is composed of a first molecular sieve adsorption tower MS1201, a second molecular sieve adsorption tower MS1202, a third molecular sieve adsorption tower MS1203 and a fourth molecular sieve adsorption tower MS1204 which are arranged in parallel, and the four towers work in parallel; the tops of the first molecular sieve adsorption tower MS1201, the second molecular sieve adsorption tower MS1202, the third molecular sieve adsorption tower MS1203 and the fourth molecular sieve adsorption tower MS1204 are connected with a compressed air outlet flow path and a regenerated gas outlet flow path, and the bottoms of the first molecular sieve adsorption tower MS1201, the second molecular sieve adsorption tower MS1202, the third molecular sieve adsorption tower MS1203 and the fourth molecular sieve adsorption tower MS1204 are connected with a compressed air inlet flow path, a cold blowing flow path, a pre-heating gas flow path and a high temperature gas flow path.
Specifically, the compressed air heat exchange system is composed of an air compressor AC1001, a first-stage heat exchanger E1, a second-stage heat exchanger E2, a third-stage heat exchanger E3, a fourth-stage heat exchanger E4 and a compressed air heat exchange flow path, wherein an outlet of the air compressor AC1001 is communicated with the compressed air heat exchange flow path, and the compressed air heat exchange flow path is communicated with a compressed air inlet flow path after sequentially passing through the first-stage heat exchanger E1, the second-stage heat exchanger E2, the third-stage heat exchanger E3 and the fourth-stage heat exchanger E4; in the embodiment, the temperature of the primary heat exchanger is controlled to be about 135 ℃, the temperature of the secondary heat exchanger is controlled to be about 85 ℃, and the temperature of the tertiary heat exchanger is controlled to be about 65 ℃.
Specifically, the above-mentioned regeneration gas pipe system comprises regeneration gas house steward, first regeneration gas is divided into the pipe, second regeneration gas is divided into the pipe, third regeneration gas is divided into the pipe and electric heater EH1201, the dirty nitrogen gas from the cold box gets into from the regeneration gas house steward, the export of regeneration gas house steward is connected with first regeneration gas and second regeneration gas respectively and is divided into the pipe, first regeneration gas is divided into two ways after the second regeneration gas is divided into the pipe through second heat exchanger E2, wherein first way is divided into the pipe and is communicated with preheating air current way, second way is divided into the pipe and is communicated with high temperature air current way after passing through first heat exchanger E1 and electric heater EH 1201.
Specifically, the compressed air intake flow route is a first compressed air intake flow path V1 connected to the first molecular sieve adsorption tower MS1201, a seventh compressed air intake flow path V7 connected to the second molecular sieve adsorption tower MS1202, a thirteenth compressed air intake flow path V13 connected to the third molecular sieve adsorption tower MS1203, and a nineteenth compressed air intake flow path V19 connected to the fourth molecular sieve adsorption tower MS 1204; the compressed air outlet flow path comprises a second compressed air outlet flow path V2 connected with the first molecular sieve adsorption tower MS1201, an eighth compressed air outlet flow path V8 connected with the second molecular sieve adsorption tower MS1202, a fourteenth compressed air outlet flow path V14 connected with the third molecular sieve adsorption tower MS1203 and a twentieth compressed air outlet flow path V20 connected with the fourth molecular sieve adsorption tower MS 1204; valves are arranged on the flow path pipelines.
Specifically, the cold blow air flow path is composed of a third cold blow air flow path V3 connected to the first molecular sieve adsorption tower MS1201, a ninth cold blow air flow path V9 connected to the second molecular sieve adsorption tower MS1202, a fifteenth cold blow air flow path V15 connected to the third molecular sieve adsorption tower MS1203, and a twenty-first cold blow air flow path V21 connected to the fourth molecular sieve adsorption tower MS 1204; the preheating air flow path comprises a fifth preheating air flow path V5 connected with the first molecular sieve adsorption tower MS1201, an eleventh preheating air flow path V11 connected with the second molecular sieve adsorption tower MS1202, a seventeenth preheating air flow path V17 connected with the third molecular sieve adsorption tower MS1203 and a thirteenth preheating air flow path V23 connected with the fourth molecular sieve adsorption tower MS 1204; the high-temperature gas flow paths include a sixth high-temperature gas flow path V6 connected to the first molecular sieve adsorption tower MS1201, a twelfth high-temperature gas flow path V12 connected to the second molecular sieve adsorption tower MS1202, an eighteenth high-temperature gas flow path V18 connected to the third molecular sieve adsorption tower MS1203, and a twenty-fourth high-temperature gas flow path V24 connected to the fourth molecular sieve adsorption tower MS 1204; the regenerated gas outlet flow path comprises a fourth regenerated gas outlet flow path V4 connected with the first molecular sieve adsorption tower MS1201, a tenth regenerated gas outlet flow path V10 connected with the second molecular sieve adsorption tower MS1202, a sixteenth regenerated gas outlet flow path V16 connected with the third molecular sieve adsorption tower MS1203 and a twenty second regenerated gas outlet flow path V22 connected with the fourth molecular sieve adsorption tower MS 1204; valves are arranged on the flow path pipelines.
Specifically, an eleventh thermometer TI101 is installed on the regenerated gas main pipe, and is used for detecting the temperature of the polluted nitrogen gas exiting the cold box, a first control valve FCV1201 and a first flowmeter FI1201 are sequentially installed on a pipeline before the second regenerated gas branch pipe flows through the secondary heat exchanger E2, the first flowmeter FI1201 is used for detecting the total flow of the heated gas, the first control valve FCV1201 and the first flowmeter FI1201 are electrically connected, and the electrical connection can be in a wired or wireless mode, in this embodiment, the connection is performed in a wired mode, that is, the opening angle of the first control valve FCV1201 is controlled according to the measurement result of the first flowmeter FI 1201; the first branch pipe is provided with a second control valve FCV1202 on a pipeline, the pipeline before the second branch pipe flows through the primary heat exchanger E1 is provided with a second flowmeter FI1202, the second flowmeter FI1202 is used for detecting the total flow of high-temperature heating gas, the second control valve FCV1202 and the second flowmeter FI1202 are electrically connected, the electrical connection can be in a wired or wireless mode, in the embodiment, the connection is in a wired mode, namely, the opening angle of the second control valve FCV1202 is controlled according to the measurement result of the second flowmeter FI 1202; a ninth thermometer TIS1209 and a tenth thermometer TIS1210 are sequentially installed on a pipeline after the second branch pipe flows through the primary heat exchanger E1, the electric heater EH1201 is located between the ninth thermometer TIS1209 and the tenth thermometer TIS1210, and the ninth thermometer TIS1209 and the tenth thermometer TIS1210 respectively measure inlet and outlet temperatures of the electric heater.
Specifically, the twelfth thermometer TI102 is installed after the compressed air heat exchange flow path flows through the third-stage heat exchanger E3, the twelfth thermometer TI102 is used for measuring the temperature of the compressed air flowing out of the third-stage heat exchanger, the third-stage heat exchanger E3 adopts a gas-water heat exchanger, the inlet of the cooling water pipeline is provided with the regulating valve TCV101, the regulating valve TCV101 is electrically connected with the twelfth thermometer TI102, the electric connection can be in a wired or wireless mode, and in the embodiment, the connection is performed in a wired mode, namely, the opening angle of the regulating valve TCV101 is controlled according to the measurement result of the twelfth thermometer TI 102.
Specifically, a first thermometer TIS1201 and a second thermometer TIS1202 are respectively installed at the bottom and the top of the first molecular sieve adsorption tower MS1201, a third thermometer TIS1203 and a fourth thermometer TIS1204 are respectively installed at the bottom and the top of the second molecular sieve adsorption tower MS1201, a fifth thermometer TIS1205 and a sixth thermometer TIS1206 are respectively installed at the bottom and the top of the third molecular sieve adsorption tower MS1201, and a seventh thermometer TIS1207 and an eighth thermometer TIS1208 are respectively installed at the bottom and the top of the fourth molecular sieve adsorption tower MS 1201; the above eight temperature points measure the inlet and outlet temperatures of the four molecular sieve adsorption towers, respectively.
Specifically, the top parts of the first molecular sieve adsorption tower MS1201, the second molecular sieve adsorption tower MS1202, the third molecular sieve adsorption tower MS1203 and the fourth molecular sieve adsorption tower MS1204 are respectively provided with a first pressure gauge PIS1201, a second pressure gauge PIS1202, a third pressure gauge PIS1203 and a fourth pressure gauge PIS1204, and the pressure gauges are respectively used for measuring the pressure of the molecular sieve adsorption towers.
Specifically, a twenty-ninth pressure equalizing flow path V29 is connected between the top of the first molecular sieve adsorption tower MS1201 and the top of the second molecular sieve adsorption tower MS1202, a thirty-first pressure equalizing flow path V31 is connected between the top of the third molecular sieve adsorption tower MS1203 and the top of the fourth molecular sieve adsorption tower MS1204, a thirty-second pressure equalizing flow path V32 is connected between the top of the fourth molecular sieve adsorption tower MS1204 and the top of the first molecular sieve adsorption tower MS1201, valves are installed on the flow path pipelines, and pressure equalizing manual ball valves are used in cooperation with the pressure equalizing valves to control the pressure equalizing speed; the twenty-ninth equalizing flow path V29, the thirty-eighth equalizing flow path V30, the thirty-first equalizing flow path V31 and the thirty-second equalizing flow path V32 are respectively provided with a twenty-fifth equalizing valve HV25, a twenty-sixth equalizing valve HV26, a twenty-seventh equalizing valve HV27 and a twenty-eighth equalizing valve HV28; the valve, the thermometer, the pressure gauge, the flowmeter and the electric heater are all electrically connected with a controller, and the controller can adopt a PLC controller.
The utility model provides a waste heat utilization system of an air compressor, which comprises the following working processes of each molecular sieve adsorption tower: and (3) performing cyclic operation of adsorption, waste heat regeneration, high-temperature regeneration and cold blowing.
Taking an adsorption cycle as an example: in this embodiment, the first molecular sieve adsorption tower MS1201 is in an adsorption state, the second molecular sieve adsorption tower MS1202 is in a cold blowing state, the third molecular sieve adsorption tower MS1203 is in a high temperature regeneration state, the fourth molecular sieve adsorption tower MS1204 is in a waste heat regeneration (preheating) state, and at this time, the valves on the first compressed air inlet flow path V1, the second compressed air outlet flow path V2, the ninth cold blowing flow path V9, the tenth regenerated gas outlet flow path V10, the sixteenth regenerated gas outlet flow path V16, the eighteenth high temperature flow path V18, the twenty second regenerated gas outlet flow path V22, and the twenty third preheating flow path V23 are all in an open state.
The specific working process of the molecular sieve adsorption tower comprises the following steps:
1) First divisionWhen the sub-sieve adsorption tower MS1201 adsorbs, valves on the first compressed air inlet flow path V1 and the second compressed air outlet flow path V2 are opened to adsorb water and CO in the compressed air 2 ；
2) The second molecular sieve adsorption tower MS1202 is in a cold blowing state, and the polluted nitrogen from the cold box is subjected to cold blowing through a ninth cold blowing flow path V9 and a tenth regenerated gas outlet flow path V10 to the high-temperature regenerated second molecular sieve adsorption tower MS1202 to remove water and CO in the molecular sieve 2 The condition for ending this step is that the detected temperature of the fourth thermometer TIS1204 is less than or equal to 20 ℃.
3) The third molecular sieve adsorption tower MS1203 is in a high temperature heating stage, valves on a sixteenth regenerated gas outlet flow path V16 and an eighteenth high temperature flow path V18 are opened, dirty nitrogen from the cold box is preheated by the second heat exchanger E2 and the first heat exchanger E1, then is heated at high temperature by the electric heater EH1201, and enters the third molecular sieve adsorption tower MS1203 to thoroughly heat the molecular sieve, and the inlet temperature of the third molecular sieve adsorption tower MS1203 is judged by the fifth thermometer TIS 1205.
4) The fourth molecular sieve adsorption tower MS1204 is in a preheating stage, valves on the twenty-second regenerated gas outlet flow path V22 and the twenty-third preheating flow path V23 are opened at the moment, waste heat is obtained from the polluted nitrogen of the cold box through the secondary heat exchanger E2 and absorbed by the polluted nitrogen to preheat the fourth molecular sieve adsorption tower MS1204, and the utilization of the waste heat is beneficial to reducing the circulating water consumption of the air compressor and the energy consumption of the electric heater, and is beneficial to saving energy, reducing emission and reducing carbon emission;
5) When the next cycle comes, the pressure equalizing operation is performed, and at this time, the first molecular sieve adsorption tower MS1201 is used to perform the pressurizing process on the second molecular sieve adsorption tower MS1202, the valves on the twenty-fifth pressure equalizing valve HV25 and the twenty-ninth pressure equalizing flow path V29 are slowly opened, the pressure in the first molecular sieve adsorption tower MS1201 is used to slowly pressurize the second molecular sieve adsorption tower MS1202, and the slow pressurizing reduces the influence of the change of the outlet pressure of the first molecular sieve adsorption tower MS1201 on the subsequent fractionating tower caused by the pressurizing, so that the fluctuation or the change amplitude of the gas at the inlet of the fractionating tower is reduced, the purity and the extraction rate of the air separation product can be effectively stabilized, and especially the condition that the purity of nitrogen or the purity of oxygen exceeds the standard tends to occur easily when the molecular sieve adsorption tower is switched.
According to the waste heat utilization system of the air compressor, disclosed by the utility model, the regenerated gas absorbs heat through the primary heat exchanger and the secondary heat exchanger, so that the power consumption of an electric heater is reduced, the load of the tertiary heat exchanger is reduced, the heat emission to the environment is reduced, and the circulating water quantity is reduced; the four molecular sieve adsorption towers work in parallel, so that the filling amount of molecular sieve adsorbents in the adsorption towers is reduced, the size of the molecular sieve adsorption towers can be further reduced, the running cost is reduced, the resistance of compressed gas and regenerated gas in the adsorption towers is reduced, and the energy consumption of the air compressor is reduced; the resistance of the regenerated gas entering the tower is reduced, the stirring of the pressure in the tower is small or no fluctuation exists, the stable operation in the tower is facilitated, and the influence on the purity when the molecular sieve adsorption tower switches fluctuation is particularly solved; the molecular sieve adsorption tower is provided with a preheating process, so that the molecular sieve pulverization phenomenon caused by abrupt temperature rise of the molecular sieve adsorption tower is avoided, and the service life of the molecular sieve adsorption tower is prolonged; the molecular sieve adsorption tower has the advantages that the flow direction of other gases is consistent except for the pressure equalizing process, the phenomenon that the air flow rolls up and down is avoided, and the adsorption effect is prevented from being influenced; the waste heat of the air compressor is recycled, so that the heat loss of the air compressor in equipment in the operation process is effectively reduced, the consumption of circulating water flow is reduced, the electricity consumption of an electric heater is reduced, the requirements of energy conservation and emission reduction are met, and the electricity consumption and carbon emission of an air separation device are greatly reduced.
It should be understood that this example is only illustrative of the utility model and is not intended to limit the scope of the utility model. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present utility model, and such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (9)
1. The utility model provides a waste heat utilization system of air compressor machine which characterized in that: comprises a molecular sieve adsorption system, a compressed air heat exchange system and a regenerated gas pipeline system;
the molecular sieve adsorption system comprises a first molecular sieve adsorption tower (MS 1201), a second molecular sieve adsorption tower (MS 1202), a third molecular sieve adsorption tower (MS 1203) and a fourth molecular sieve adsorption tower (MS 1204) which are arranged in parallel, wherein the tops of the first molecular sieve adsorption tower (MS 1201), the second molecular sieve adsorption tower (MS 1202), the third molecular sieve adsorption tower (MS 1203) and the fourth molecular sieve adsorption tower (MS 1204) are connected with a compressed air outlet flow path and a regenerated gas outlet flow path, and the bottoms of the first molecular sieve adsorption tower (MS 1201), the second molecular sieve adsorption tower (MS 1202), the third molecular sieve adsorption tower (MS 1203) and the fourth molecular sieve adsorption tower (MS 1204) are connected with a compressed air inlet flow path, a cold blowing flow path, a preheating air flow path and a high-temperature air flow path;
the compressed air heat exchange system comprises an air compressor (AC 1001), a first-stage heat exchanger (E1), a second-stage heat exchanger (E2), a third-stage heat exchanger (E3), a fourth-stage heat exchanger (E4) and a compressed air heat exchange flow path, wherein an outlet of the air compressor (AC 1001) is communicated with the compressed air heat exchange flow path, and the compressed air heat exchange flow path is communicated with a compressed air inlet flow path after sequentially passing through the first-stage heat exchanger (E1), the second-stage heat exchanger (E2), the third-stage heat exchanger (E3) and the fourth-stage heat exchanger (E4);
the regenerated gas pipeline system comprises a regenerated gas main pipe, a first regenerated gas branch pipe, a second regenerated gas branch pipe, a third regenerated gas branch pipe and an electric heater (EH 1201), wherein an outlet of the regenerated gas main pipe is connected with the first regenerated gas branch pipe and the second regenerated gas branch pipe respectively, the first regenerated gas branch pipe is communicated with a cold blowing air flow path, the second regenerated gas branch pipe is divided into two paths after passing through a second-stage heat exchanger (E2), the first path branch pipe is communicated with a preheating air flow path, and the second path branch pipe is communicated with a high-temperature air flow path after passing through a first-stage heat exchanger (E1) and the electric heater (EH 1201).
2. The waste heat utilization system of an air compressor according to claim 1, wherein: the compressed air inlet flow path comprises a first compressed air inlet flow path (V1) connected with a first molecular sieve adsorption tower (MS 1201), a seventh compressed air inlet flow path (V7) connected with a second molecular sieve adsorption tower (MS 1202), a thirteenth compressed air inlet flow path (V13) connected with a third molecular sieve adsorption tower (MS 1203) and a nineteenth compressed air inlet flow path (V19) connected with a fourth molecular sieve adsorption tower (MS 1204); the compressed air outlet flow path comprises a second compressed air outlet flow path (V2) connected with the first molecular sieve adsorption tower (MS 1201), an eighth compressed air outlet flow path (V8) connected with the second molecular sieve adsorption tower (MS 1202), a fourteenth compressed air outlet flow path (V14) connected with the third molecular sieve adsorption tower (MS 1203) and a twentieth compressed air outlet flow path (V20) connected with the fourth molecular sieve adsorption tower (MS 1204); valves are arranged on the flow path pipelines.
3. The waste heat utilization system of an air compressor according to claim 2, wherein: the cold blow air flow path comprises a third cold blow air flow path (V3) connected with the first molecular sieve adsorption tower (MS 1201), a ninth cold blow air flow path (V9) connected with the second molecular sieve adsorption tower (MS 1202), a fifteenth cold blow air flow path (V15) connected with the third molecular sieve adsorption tower (MS 1203) and a twenty-first cold blow air flow path (V21) connected with the fourth molecular sieve adsorption tower (MS 1204); the preheating air flow path comprises a fifth preheating air flow path (V5) connected with the first molecular sieve adsorption tower (MS 1201), an eleventh preheating air flow path (V11) connected with the second molecular sieve adsorption tower (MS 1202), a seventeenth preheating air flow path (V17) connected with the third molecular sieve adsorption tower (MS 1203) and a twenty-third preheating air flow path (V23) connected with the fourth molecular sieve adsorption tower (MS 1204); the high-temperature gas flow paths include a sixth high-temperature gas flow path (V6) connected to the first molecular sieve adsorption tower (MS 1201), a twelfth high-temperature gas flow path (V12) connected to the second molecular sieve adsorption tower (MS 1202), an eighteenth high-temperature gas flow path (V18) connected to the third molecular sieve adsorption tower (MS 1203), and a twenty-fourth high-temperature gas flow path (V24) connected to the fourth molecular sieve adsorption tower (MS 1204); the regenerated gas outlet flow path comprises a fourth regenerated gas outlet flow path (V4) connected with the first molecular sieve adsorption tower (MS 1201), a tenth regenerated gas outlet flow path (V10) connected with the second molecular sieve adsorption tower (MS 1202), a sixteenth regenerated gas outlet flow path (V16) connected with the third molecular sieve adsorption tower (MS 1203) and a twenty second regenerated gas outlet flow path (V22) connected with the fourth molecular sieve adsorption tower (MS 1204); valves are arranged on the flow path pipelines.
4. The waste heat utilization system of an air compressor according to claim 1, wherein: an eleventh thermometer (TI 101) is installed on the regenerated gas main pipe, a first control valve (FCV 1201) and a first flowmeter (FI 1201) are sequentially installed on a pipeline before the second regenerated gas branch pipe flows through the second-stage heat exchanger (E2), the first control valve (FCV 1201) and the first flowmeter (FI 1201) are electrically connected, a second control valve (FCV 1202) is installed on the pipeline of the first branch pipe, a second flowmeter (FI 1202) is installed on the pipeline before the second branch pipe flows through the first-stage heat exchanger (E1), the second control valve (FCV 1202) and the second flowmeter (FI 1202) are electrically connected, a ninth thermometer (TIS 1209) and a tenth thermometer (TIS 1210) are sequentially installed on the pipeline after the second branch pipe flows through the first-stage heat exchanger (E1), and an electric heater (EH 1201) is located between the ninth thermometer (TIS 1209) and the tenth thermometer (TIS 1210).
5. The waste heat utilization system of an air compressor according to claim 1, wherein: the twelfth thermometer (TI 102) is arranged after the compressed air heat exchange flow path flows through the three-stage heat exchanger (E3), the three-stage heat exchanger (E3) adopts a gas-water heat exchanger, the inlet of the cooling water pipeline is provided with the regulating valve (TCV 101), and the regulating valve (TCV 101) is electrically connected with the twelfth thermometer (TI 102).
6. The waste heat utilization system of an air compressor according to claim 1, wherein: the bottom and the top of the first molecular sieve adsorption tower (MS 1201) are respectively provided with a first thermometer (TIS 1201) and a second thermometer (TIS 1202), the bottom and the top of the second molecular sieve adsorption tower (MS 1201) are respectively provided with a third thermometer (TIS 1203) and a fourth thermometer (TIS 1204), the bottom and the top of the third molecular sieve adsorption tower (MS 1201) are respectively provided with a fifth thermometer (TIS 1205) and a sixth thermometer (TIS 1206), and the bottom and the top of the fourth molecular sieve adsorption tower (MS 1201) are respectively provided with a seventh thermometer (TIS 1207) and an eighth thermometer (TIS 1208).
7. The air compressor waste heat utilization system of claim 6, wherein: the tops of the first molecular sieve adsorption tower (MS 1201), the second molecular sieve adsorption tower (MS 1202), the third molecular sieve adsorption tower (MS 1203) and the fourth molecular sieve adsorption tower (MS 1204) are respectively provided with a first pressure gauge (PIS 1201), a second pressure gauge (PIS 1202), a third pressure gauge (PIS 1203) and a fourth pressure gauge (PIS 1204).
8. The waste heat utilization system of an air compressor according to claim 1, wherein: a twenty-ninth pressure equalizing flow path (V29) is connected between the tops of the first molecular sieve adsorption tower (MS 1201) and the second molecular sieve adsorption tower (MS 1202), a thirty-first pressure equalizing flow path (V30) is connected between the tops of the second molecular sieve adsorption tower (MS 1202) and the third molecular sieve adsorption tower (MS 1203), a thirty-first pressure equalizing flow path (V31) is connected between the tops of the third molecular sieve adsorption tower (MS 1203) and the fourth molecular sieve adsorption tower (MS 1204), and a thirty-second pressure equalizing flow path (V32) is connected between the tops of the fourth molecular sieve adsorption tower (MS 1204) and the first molecular sieve adsorption tower (MS 1201); valves are arranged on the flow path pipelines.
9. The air compressor waste heat utilization system of claim 8, wherein: the twenty-ninth equalizing flow path (V29), the thirty-first equalizing flow path (V30), the thirty-first equalizing flow path (V31) and the thirty-second equalizing flow path (V32) are respectively provided with a twenty-fifth equalizing valve (HV 25), a twenty-sixth equalizing valve (HV 26), a twenty-seventh equalizing valve (HV 27) and a twenty-eighth equalizing valve (HV 28).
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| CN202320416310.6U CN219399556U (en) | 2023-02-28 | 2023-02-28 | Waste heat utilization system of air compressor |
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