JP4784354B2 - Compressor performance test method and compressor performance test apparatus - Google Patents

Description

  The present invention relates to a compressor performance test method for performing a performance test of a compressor, particularly an oxygen compressor, and a compressor performance test apparatus for performing the compressor performance test method.

  In the compressor, a process gas as a gas to be compressed and a seal gas for sealing the shaft seal device are supplied, and a performance test for confirming the performance of various points such as the compression performance or the seal performance of the shaft seal device is performed. Done.

  A shaft seal device for preventing leakage of compressed process gas is provided in the bearing portion of the compressor, and a non-contact type gas shaft seal device, for example, a labyrinth shaft seal device is provided in the shaft seal device. It is done.

  Such a gas shaft seal device is an object of a performance test. In the gas shaft seal device, the process gas entering from the inside of the compressor is reduced in pressure by the shaft seal device, and further, a pressure higher than the outside is applied to the end of the shaft seal device. The sealing gas is supplied to prevent leakage of process gas. Further, in an oxygen compressor in which the process gas is oxygen gas, since oxygen gas induces explosion, nitrogen gas, which is an inert gas, is used as a seal gas as disclosed in Patent Document 1.

  Conventionally, when performing a performance test in an oxygen compressor performance test apparatus, a substitute gas for oxygen gas is used as the process gas. However, if humidity is included, it is difficult to convert the performance test result into a process gas. Therefore, a gas that does not contain moisture, that is, a humidity of 0 is used. Nitrogen gas is used as the gas with a humidity of 0, and nitrogen gas is also used as the seal gas in the same manner as in the actual operation state.

  First, an outline of a gas shaft seal device of an oxygen compressor will be described with reference to FIG.

  In the figure, 1 is an impeller, 2 is a rotating shaft, 3 is a bearing block, the impeller 1 is fixed to the rotating shaft 2, and the rotating shaft 2 is gas-sealed by a gas shaft sealing device 4.

  The gas shaft seal device 4 is a labyrinth shaft seal device, and includes a bush 5 and a housing portion 6 that rotate integrally with the rotary shaft 2, and a required number of labyrinth seal portions between the bush 5 and the housing portion 6. For example, the first labyrinth seal portion 7, the second labyrinth seal portion 8, the third labyrinth seal portion 9, the fourth labyrinth seal portion 10, the fifth labyrinth seal portion 11, and the sixth labyrinth seal portion 12 are formed from the high pressure side. Is formed.

  The first labyrinth seal portion 7, the second labyrinth seal portion 8, the third labyrinth seal portion 9, the fourth labyrinth seal portion 10, the fifth labyrinth seal portion 11, and the sixth labyrinth seal portion 12 are respectively pressed. Chambers 13, 14, 15, 16, and 17 are formed, a process gas recovery line 18 is connected to the pressure chambers 13, 14, and 15, and an atmospheric purge line 19 is connected to the pressure chamber 16. A seal gas supply line 21 is connected to the pressure chamber 17.

  In the gas shaft seal device 4, the process gas leaked from the process gas recovery line 18 is recovered, and nitrogen gas as a seal gas is supplied to the pressure chamber 17 at a pressure higher than the external pressure. The seal gas leaks out from the pressure chamber 17 and flows into the pressure chamber 16, and the process gas and the seal gas are sucked from the pressure chamber 16 through the atmospheric purge line 19 and released into the atmosphere. Is done.

  Therefore, the bearing portion is gas-sealed by the gas shaft seal device 4 so that the process gas does not leak out.

  Next, a conventional oxygen compressor performance test apparatus 22 will be described with reference to FIG.

  FIG. 4 shows an oxygen compressor 25 having a first stage compressor 23 and a second stage compressor 24 for compressing in two stages. The first stage compressor 23 and the second stage compressor 24 are driven by a motor 26 into a gear box. 27 is driven. The above-described gas shaft seal devices 4 and 4 are provided at bearing portions of the first-stage compressor 23 and the second-stage compressor 24.

  In the figure, reference numerals 28 and 29 denote coolers for cooling the process gas heated by compression. The cooler 29 and the inlet side of the first stage compressor 23 are connected by a bypass line 31, and a pressure regulating valve 32 is provided in the bypass line 31. In a state where the oxygen compressor 25 is actually installed, the process gas compressed to a required pressure is supplied from the cooler 29 as a required application, for example, a combustion gas for iron making.

  The bypass line 31 is used for disconnecting from the supply-side equipment during maintenance of the oxygen compressor 25, and the bypass line 31 supplies process gas discharged from the cooler 29 to the first-stage compressor 23. Used for pressure adjustment when circulating.

  In FIG. 4, reference numeral 35 denotes a nitrogen gas supply source. The nitrogen gas supply source 35 is connected to the gas shaft sealing devices 4 and 4 via a seal gas supply line 36, and a process gas supply line 37 is connected to the gas shaft seal device 4. Via the inlet side of the first stage compressor 23. The process gas supply line 37 is provided with a safety valve 38 so that the pressure of the process gas supply line 37 does not exceed a predetermined pressure.

  As the nitrogen gas supply source 35, for example, a required number of nitrogen gas cylinders are prepared, or a tank truck of liquefied nitrogen gas is prepared.

  When performing a performance test of the oxygen compressor 25, the first stage compressor 23 and the second stage compressor 24 are driven by the motor 26, and the nitrogen gas supply source 35 passes through the process gas supply line 37. Nitrogen gas is supplied to the first-stage compressor 23 as a process substitute gas, and seal gas is supplied to the gas shaft seal devices 4 and 4 through the seal gas supply line 36. The process substitute gas compressed by the two-stage compressor 24 and cooled by the cooler 29 is circulated to the first-stage compressor 23 via the bypass line 31. Further, the process substitute gas that is insufficient in circulation is replenished by the process gas supply line 37.

  Thus, a performance test on the compression performance of the oxygen compressor 25, a processing gas amount, and the like is performed, and a sealing performance of the gas shaft seal device 4 is tested.

In the conventional compressor performance test apparatus, the seal gas and the process substitute gas are both supplied from the same nitrogen gas supply source 35, and the supplied seal gas is in the atmosphere. Is released and consumed in large quantities. The amount of consumption is a huge amount of consumption of 300 m ³ / h even with a small oxygen compressor 25 having a processing air volume of about 20000 normal m ³ / h, and the running cost is extremely high. In addition, it is not easy to secure the necessary amount of nitrogen gas, and there are cases where the test schedule is restricted by securing sufficient nitrogen gas.

  Furthermore, since a large-sized oxygen compressor consumes too much nitrogen gas and it is difficult to supply gas according to consumption, a performance test is not currently performed.

  However, there are many requests from customers to perform performance tests on large oxygen compressors, and when performing performance tests on large oxygen compressors, a nitrogen gas supply source commensurate with the huge amount of nitrogen gas consumed. As a result, it is necessary to install a new tank facility, etc., and there is a problem that the cost for the performance test becomes very expensive due to the consumption of a large amount of nitrogen gas.

  In addition, there exists a thing shown by patent document 1 as a shaft seal apparatus of an oxygen compressor, and there exists a thing shown by patent document 2 as a compressor performance test apparatus.

JP 2000-205414 A

Japanese Patent Laid-Open No. 11-6483

  In view of such circumstances, the present invention makes it possible to perform a compressor performance test without using nitrogen gas, to reduce the cost of the compressor performance test, and to eliminate restrictions caused by securing of nitrogen gas. .

  The present invention relates to a compressor performance test method in which a process gas is supplied as a gas to be compressed, a seal gas is supplied to a shaft seal device, and a performance test is performed. This is a compressor performance test method in which air is removed and dried, and dried air is supplied to the shaft seal device as at least a sealing gas.

  Further, the present invention provides a compressor performance test method in which a process gas is supplied as a gas to be compressed and a seal gas is supplied to a shaft seal device to perform a performance test. The present invention relates to a compressor performance test method in which moisture is removed and dried, and dried air is supplied as a process gas to the compressor and as a seal gas to the shaft seal device.

  According to the present invention, a compressor performance test device is connected to a seal gas supply line for supplying a seal gas to a gas shaft seal device of the compressor, and the compressor performance test device sucks and compresses air from the atmosphere. And a drying means for removing moisture in the air and an oil mist remover for removing oil in the air, and supplying the dry air to the gas shaft seal device via the seal gas supply line This relates to the compressor performance testing apparatus.

  Further, according to the present invention, a compressor performance test device is connected to a seal gas supply line and a process gas supply line for supplying seal gas to a gas shaft seal device of the compressor, and the compressor performance test device sucks air from the atmosphere. An air compression device for compressing, a drying means for removing moisture in the air, and an oil mist remover for removing oil in the air, and the gas through the seal gas supply line using dry air as a seal gas The present invention relates to a compressor performance test apparatus configured to be supplied to a shaft seal device and supplied to the process gas supply line as a process gas.

  Furthermore, the present invention is a compressor performance test in which the air compressor is driven through a gear box, the inside of the gear box is set to a negative pressure, and mixing of oil mist generated in the gear box into the compressed air is prevented. It concerns the device.

  According to the present invention, in a compressor performance test method in which a process gas is supplied as a gas to be compressed and a seal gas is supplied to a shaft seal device to perform a performance test. The water was removed and dried, and the dried air was supplied to the shaft seal device as at least a seal gas, so that a sufficient amount of seal gas required for the compressor performance test could be prepared, There is no restriction in securing, and no cost is generated due to consumption of the sealing gas, and the running cost can be greatly reduced.

  According to the present invention, in a compressor performance test method for performing a performance test by supplying a process gas as a gas to be compressed and supplying a seal gas to a shaft seal device, air is sucked and compressed from the atmosphere, Since moisture was removed and dried, and the dried air was supplied to the compressor as a process gas and to the shaft seal device as a seal gas, the seal gas and process required for the compressor performance test A sufficient amount of gas can be prepared, there is no restriction on securing of sealing gas and process gas, and there is no cost generation due to consumption of sealing gas and process gas, and running cost can be greatly reduced. it can.

  According to the invention, the compressor performance test device is connected to the seal gas supply line that supplies the seal gas to the gas shaft seal device of the compressor, and the compressor performance test device is an air that sucks and compresses air from the atmosphere. A compression device, a drying means for removing moisture in the air, and an oil mist remover for removing oil in the air are provided, and dry air is supplied to the gas shaft seal device via the seal gas supply line. As a result, the required amount of seal gas for the compressor performance test can be prepared sufficiently, there is no restriction on securing the seal gas, and there is no cost generation due to consumption of the seal gas. Can be greatly reduced.

  According to the present invention, the compressor performance test device is connected to the seal gas supply line and the process gas supply line for supplying the seal gas to the gas shaft seal device of the compressor, and the compressor performance test device is connected to the air from the atmosphere. An air compressor for sucking and compressing air, a drying means for removing moisture in the air, and an oil mist remover for removing oil in the air, and using dry air as a seal gas via the seal gas supply line Since the gas shaft seal device is supplied to the process gas supply line as a process gas, a sufficient amount of seal gas and process gas necessary for the compressor performance test can be prepared. There are no restrictions on securing the system, and there is no cost associated with consuming seal gas and process gas, greatly increasing running costs. It can be reduced.

  Furthermore, according to the present invention, the air compressor is driven through a gear box, the inside of the gear box is made negative pressure, and oil mist generated in the gear box is prevented from being mixed into the compressed air. The load of the oil mist remover is reduced, and the oil mist removal performance can be maintained over a long period of time.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows an outline of a compressor performance test apparatus according to the present invention. In FIG. 1, the same components as those shown in FIG.

  A compressor performance test apparatus 41 is connected to the seal gas supply line 36 and the process gas supply line 37 via an air valve 39 and an air valve 40. The compressor performance test apparatus 41 compresses and drys air and supplies the oxygen compressor 25 as a seal gas and a process gas to perform a performance test.

  The compressor performance test apparatus 41 mainly includes an air compressor 42, a refrigeration dryer 43, a filter unit 44, and the like.

  The air compressor 42 is configured such that an air compressor 45 is driven by a motor 46 via a gear box 47, and a vacuum pump 48 is connected to the gear box 47, and the gears 47 are used to The inside of the box 47 is sucked so as to become a negative pressure, the pressure inside the gear box 47 is detected by a pressure detector 49, and the pressure detected by the pressure detector 49 is displayed on the display of the pressure detector 49 or separately. Displayed by a monitor (not shown), the operator can monitor the pressure in the gear box 47 from the displayed pressure. By making the pressure in the gear box 47 negative, oil mist generated in the gear box 47 is prevented from entering the compressed air.

  The discharge side of the air compressor 45 is connected to the refrigeration dryer 43 via an air valve 51. The refrigeration dryer 43 physically removes moisture in the air, cools the air and condenses the moisture in the air, and the condensed water is discharged out of the refrigeration dryer 43 through a drain 52. To do. The dew point at the outlet of the air discharged from the refrigeration dryer 43 is determined by the pressure of the process gas supplied by the oxygen compressor 25. For example, the pressure of the supplied process gas is 2.9 MPa to 3. At 5 MPa, the dew point is −40 ° C. at 0.8 MPa.

  The filter unit 44 includes an air valve 53 connected to the refrigeration dryer 43, a moisture remover 54 for removing condensed water, an adsorption air dryer 55, an oil mist remover 56, the seal gas supply line 36, and the process gas supply. The air valve 57 is connected to the line 37.

  The moisture remover 54 is physically removed from the air sent from the refrigeration dryer 43 by causing condensed water droplets and mist-like water to collide with an obstacle to form water droplets. The adsorption type air dryer 55 includes at least one set, preferably two or more sets of adsorption units 58a and 58b, and the adsorption units 58a and 58b are filled with a desiccant such as silica gel as a moisture adsorbent, The moisture in the air is chemically absorbed and removed by the desiccant. If the refrigeration dryer 43 can sufficiently remove moisture, the moisture remover 54 can be omitted.

  The air passing through the moisture remover 54 passes through one of the adsorption units 58a and 58b, for example, the adsorption unit 58a, and the other adsorption unit 58b is reserved. When the moisture adsorption action of the adsorption unit 58a is reduced, the flow path is switched and the adsorption unit 58a can be removed, moisture is removed by the adsorption unit 58b, and the desiccant of the adsorption unit 58a is removed. It can be exchanged for a new one. Accordingly, the desiccant of the adsorption units 58a and 58b can be replaced without stopping or interrupting the performance test of the oxygen compressor 25.

  The oil mist remover 56 has a filter, and the oil mist in the compressed air is removed by the filter when the compressed air passes through the filter.

  As the oil mist removing capability of the oil mist remover 56, for example, when the oil content on the inlet side is 30 wtppm, the oil content at the outlet has the capability to be reduced to 0.003 wtppm.

  A pressure adjustment line 62 is provided between the air valve 51 and the refrigeration dryer 43 via an air valve 61, and a pressure adjustment valve 63 and a silencer 64 are provided in the pressure adjustment line 62. When the pressure of the pressure adjustment line 62 becomes equal to or higher than a predetermined pressure, the pressure adjustment valve 63 is discharged to the atmosphere via the silencer 64, and the pressure of the compressed air sent to the refrigeration dryer 43 An upper limit is set.

  The air compressor 42 is connected via the air valve 51, the pressure adjustment line 62 is connected via the air valve 61, and the filter unit 44 is connected via the air valve 53 and the air valve 57. The seal gas supply line 36 is connected via the air valve 39, and the process gas supply line 37 is connected via the air valve 40. Each unit can be disconnected via the air valve. Adjustment and maintenance are possible.

  When the performance test of the oxygen compressor 25 is performed, the air compressor 45 is driven by the motor 46 and compressed air is supplied to the motor 26 so that the first stage compressor 23 and the second stage compressor 24 are driven by the motor 26. Is driven.

  The compressed air sent out from the air compressor 45 is cooled by the refrigeration dryer 43, moisture in the air is condensed, and is removed through the drain 52. Furthermore, moisture and water vapor in the air are completely removed by the moisture remover 54 and the adsorption units 58a and 58b. Since most of the moisture in the air is removed by the refrigeration dryer 43, the load on the adsorption units 58a and 58b is reduced, and the replacement frequency of the desiccant is reduced. The refrigeration dryer 43, the moisture remover 54, and the adsorption air dryer 55 constitute a drying unit that removes moisture from the air. Regardless of the above configuration, the moisture is removed from the air. It only has to be.

  In addition, oil is removed by the oil mist remover 56, and air from which the oil is completely removed from the filter unit 44 is sent out. Since the inside of the gear box 47 is set to a negative pressure so that the oil mist generated inside the gear box 47 is not mixed with the compressed air, the load on the oil mist remover 56 is reduced, and the oil mist is reduced. The oil mist removal performance of the mist remover 56 is maintained for a long time, and the filter replacement interval can be extended.

  A part of the air sent out from the filter unit 44 is supplied to the gas shaft seal device 4 as a seal gas through the seal gas supply line 36, and the remaining part is supplied as a process gas through the process gas supply line 37. The first stage compressor 23 is supplied. The process gas may be circulated through the bypass line 31. In this case, the amount of process gas supplied from the process gas supply line 37 may be only replenishment, and the supply amount may be small.

  Since the sealing gas and process gas used for the performance test are dried air in the atmosphere, a sufficient amount can be secured and can be supplied at any time, and there is no restriction on the timing of performing the performance test. Furthermore, using the performance test gas itself is not costly.

  FIG. 2 shows another embodiment, in which the process gas supply line 37 is separated from the seal gas supply line 36, and the process gas supply line 37 is connected to another gas supply source 66, for example, a nitrogen gas supply source. Connect to.

  The seal gas supply line 36 that consumes a large amount of gas is supplied with dry air from the compressor performance test apparatus 41, and the process gas is circulated through the bypass line 31 to suppress the gas consumption. Minute nitrogen gas is supplied from the gas supply source 66.

  Also in the other embodiments, the consumption of nitrogen gas can be greatly reduced, and the running cost is greatly reduced.

It is a schematic block diagram which shows embodiment of this invention. It is a schematic block diagram which shows other embodiment of this invention. It is sectional drawing which shows the gas shaft seal apparatus of the oxygen compressor with which this invention is implemented. It is explanatory drawing which shows a prior art example.

Explanation of symbols

4 Gas shaft seal device 25 Oxygen compressor 23 First stage compressor 24 Two stage compressor 31 Bypass line 36 Seal gas supply line 37 Process gas supply line 41 Compressor performance test device 42 Air compressor 43 Refrigeration dryer 44 Filter unit 45 Air compressor 47 Gear box 48 Vacuum pump 54 Moisture remover 55 Adsorption air dryer 56 Oil mist remover

Claims (5)

  In the compressor performance test method, in which a process gas is supplied as a gas to be compressed and a seal gas is supplied to the shaft seal device to perform a performance test, air is sucked and compressed from the atmosphere to remove moisture in the air. A compressor performance test method, characterized in that dried and dried air is supplied to the shaft seal device as at least a seal gas.   In the compressor performance test method, in which a process gas is supplied as a gas to be compressed and a seal gas is supplied to the shaft seal device to perform a performance test, air is sucked and compressed from the atmosphere to remove moisture in the air. A method for testing a compressor performance, characterized in that the dried and dried air is supplied as a process gas to the compressor and as a seal gas to the shaft seal device.   A compressor performance test device is connected to a seal gas supply line that supplies seal gas to a gas shaft seal device of the compressor. The compressor performance test device includes an air compressor that sucks and compresses air from the atmosphere, It comprises a drying means for removing moisture and an oil mist remover for removing oil in the air, and is configured to supply dry air to the gas shaft seal device via the seal gas supply line. Compressor performance test equipment.   A compressor performance test apparatus is connected to a seal gas supply line and a process gas supply line for supplying a seal gas to a gas shaft seal device of the compressor, and the compressor performance test apparatus is an air compression apparatus for sucking and compressing air from the atmosphere. And a drying means for removing moisture in the air and an oil mist remover for removing oil in the air, and supplying dry air as seal gas to the gas shaft seal device via the seal gas supply line And a compressor performance test apparatus configured to supply the process gas as a process gas to the process gas supply line.   5. The compressor according to claim 3, wherein the air compressor is driven through a gear box, and the inside of the gear box is set to a negative pressure to prevent oil mist generated in the gear box from entering the compressed air. Performance test equipment.

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