JPH05106560A - Multi-stage compressor system - Google Patents

Abstract

PURPOSE:To enhance the control efficiency for the temp. of the discharge compressed air by performing the control directly through adjustment of the amount of compressed air to be fed flowing to an intercooler. CONSTITUTION:A discharge temp. control device 10 to control the temp. of the compressed air discharged from a multi-stage compressor 1 on the basis of the temp. of the discharge compressed air is composed of a temp. sensor 11 installed on a discharge piping 5 of the final stage compressor, a bypass piping 13 arranged between the discharge piping 2 of the fore stage compressor and the suction piping 3 of a back stage compressor so as to detour by an intercooler 4, and a bypass rate-of-flow adjusting valve 14 furnished on this bypass piping 13. The amount of compressed air flowing from the fore stage compressor into the back stage compressor is adjusted by the rate-of-flow adjusting valve 14 on the basis of the sensing value of the temp. sensor 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage compressor facility having, for example, a dryer, and more particularly to a discharge temperature control device applied to such a multi-stage compressor facility.
In particular, the present invention relates to a discharge temperature control device for a multi-stage compressor facility, which enables efficient control of discharge temperature from the final stage compressor.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a conventional multistage compressor facility having a dryer device. In FIG. 3, an intercooler 4 is provided between the discharge pipe 2 of the former stage compressor and the suction pipe 3 of the latter stage compressor which constitute the multistage compressor 1, and the intercooler 4 cools the compressed air. It has become.

The discharge pipe 5 of the final stage compressor of the multi-stage compressor 1 is branched into two parts from the middle, one of which is connected to one adsorption cylinder 7 via an aftercooler 6 and the other is the adsorption cylinder. 7 is connected to another adsorption cylinder 8 arranged in parallel. The latter adsorption cylinder 8 is a drain separator (for example,
The former adsorption cylinder 7 via a cooler for cooling the compressed air passing through the adsorption cylinder and a cyclone for removing drain from the compressed air cooled by the cooler.
It is connected to the.

In the configuration described above, the adsorption cylinder 8 in which a part of the high temperature compressed air from the multi-stage compressor 1 is in a moisture absorption saturated state
And the adsorption cylinder 8 is heated and regenerated by hot compressed air. The remaining high-temperature compressed air reaches the adsorption cylinder 7 through the actuator cooler 6. The compressed air flowing out from the adsorption cylinder 8 is in a high temperature state containing the moisture expelled from the adsorption cylinder 8,
The drain of the compressed air is removed by the drain separator 9, and then the compressed air is transferred to the adsorption cylinder 7 and transferred to the external demand load equipment.

Then, the adsorption cylinder 7 having this moisture absorption function
Is approaching the moisture absorption saturated state and the other adsorption cylinder 8 is nearing the completion of heating regeneration, the regeneration adsorption cylinder 8 and the saturated adsorption cylinder 7 are replaced by switching the switching valve (not shown). The flow of the compressed air is switched, and thus the adsorption cylinder that has reached the moisture absorption saturation by the heat of the compressed air discharged from the multi-stage compressor 1 is heated and regenerated.

By the way, in such a multi-stage compressor facility equipped with a dryer, the temperature of the compressed air discharged from the multi-stage compressor 1 is conventionally determined based on the temperature of the discharged compressed air as shown in FIG. A device provided with a discharge temperature control device 10 for controlling the temperature to a certain value or higher is known. That is, the discharge temperature control device 10 controls the multi-stage compressor 1
The air discharged from the last-stage compressor is kept at a temperature of a predetermined value or higher, and the dew point is controlled to a fixed value or lower to prevent the occurrence of dew condensation.

[0007]

However, in the conventional example, the discharge temperature control device 10 includes the temperature detector 11 provided in the discharge pipe 5 of the final compressor of the multi-stage compressor 1.
And a refrigerant supply amount adjusting means 12 such as a valve for adjusting the refrigerant supply amount of the intercooler 4 provided in the multi-stage compressor 1. That is, the discharge air temperature is detected by the temperature detector 11, and the cooling capacity of the intercooler 4 is adjusted by the refrigerant supply amount adjusting means 12 based on the detected value so that the discharge air temperature is controlled to a certain value or higher. However, in such a configuration, since the refrigerant (secondary side) is controlled to control the temperature of the compressed air (primary side), the efficiency is not necessarily high.

The present invention has been made in order to solve the above-mentioned problems of the prior art. In order to control the temperature of the compressed air (primary side), the intercooler is used instead of the refrigerant (secondary side). It is an object of the present invention to provide a discharge temperature control device for a multi-stage compressor facility, which is capable of directly controlling by adjusting the amount of compressed air to be flowed and improving control efficiency.

[0009]

In order to solve the above-mentioned problems, the present invention provides a multi-stage compressor and a discharge pipe of a pre-stage compressor and a suction pipe of a post-stage compressor which constitute this multi-stage compressor. And a pair of adsorption cylinders connected in parallel to the discharge pipe of the final stage compressor for cooling compressed air and alternately used for moisture absorption and heating regeneration of the discharged compressed air, and the discharged compressed air. In a multi-stage compressor facility including a discharge temperature control device that controls the temperature of compressed air discharged from the multi-stage compressor to a constant value or higher based on the temperature of, the discharge temperature control device is the final stage compressor. A temperature detector provided in the discharge pipe of, a bypass pipe provided to bypass the intercooler between the discharge pipe of the former compressor and the suction pipe of the latter compressor, and this bypass pipe, Based on the detected value from the temperature detector to keep the temperature of the compressed air discharged from the final stage compressor at a certain value or more, the compressed air flowing from the former stage compressor to the latter stage compressor through the bypass pipe And a bypass flow rate adjusting means for adjusting the flow rate.

[0010]

The temperature at the outlet of the compressor is determined by the temperature at the inlet of the final stage if the pressure ratio and efficiency of the compressor are unchanged. This inlet temperature corresponds to the temperature of the compressed air discharged from the intercooler. Therefore, according to the present invention, in order to keep the temperature of the discharge air of the intercooler constant by the above-mentioned means, high temperature compressed air not cooled by the intercooler is made to flow to the discharge side from the intercooler through the bypass pipe. Since the flow rate is adjusted by the bypass flow rate adjusting means, the discharge temperature of the compressor can be constantly increased to a value higher than the preset value, and the compressed air to be transferred to the load demand equipment outside the system has a preset dew point value. The following can be controlled automatically.

As described above, according to the present invention, in order to control the temperature of the compressed air (primary side), not the refrigerant (secondary side) but the amount of compressed air flowing to the intercooler is directly adjusted. Since the control is performed, the control efficiency can be improved.

[0012]

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 and 2, the same reference numerals are used for the same components as those of the conventional example shown in FIG.

FIG. 1 shows a first embodiment of the present invention, and in this embodiment as well, an intercooler is provided between a discharge pipe 2 of a front stage compressor and a suction pipe 3 of a rear stage compressor which constitute a multi-stage compressor 1. 4 is provided, and the compressed air is cooled by the intercooler 4.

Further, the discharge pipe 5 of the final stage compressor of the multi-stage compressor 1 is branched into two in the middle, one of which is connected to one adsorption cylinder 7 via an aftercooler 6 and the other is the adsorption cylinder. 7 is connected to another adsorption cylinder 8 arranged in parallel. The latter adsorption cylinder 8 is a drain separator (for example,
The former adsorption cylinder 7 via a cooler for cooling the compressed air passing through the adsorption cylinder and a cyclone for removing drain from the compressed air cooled by the cooler.
It is connected to the.

In the structure described above, the adsorption cylinder 8 in which a part of the high temperature compressed air from the multi-stage compressor 1 is in a moisture absorption saturated state.
And the adsorption cylinder 8 is heated and regenerated by hot compressed air. The remaining high-temperature compressed air reaches the adsorption cylinder 7 through the actuator cooler 6. The compressed air flowing out from the adsorption cylinder 8 is in a high temperature state containing the moisture expelled from the adsorption cylinder 8,
The drain of the compressed air is removed by the drain separator 9, and then the compressed air is transferred to the adsorption cylinder 7 and transferred to the external demand load equipment.

Then, the adsorption cylinder 7 having this hygroscopic effect
Is approaching the moisture absorption saturated state and the other adsorption cylinder 8 is nearing the completion of heating regeneration, the regeneration adsorption cylinder 8 and the saturated adsorption cylinder 7 are replaced by switching the switching valve (not shown). The flow of the compressed air is switched, and thus the adsorption cylinder that has reached the moisture absorption saturation by the heat of the compressed air discharged from the multi-stage compressor 1 is heated and regenerated.

Further, in such a multi-stage compressor facility equipped with a dryer, in the present embodiment as well, the temperature of the compressed air discharged from the multi-stage compressor 1 is controlled to a certain value or higher based on the temperature of the discharged compressed air. Although the discharge temperature control device 10 is provided, the configuration thereof is different from that of the conventional example shown in FIG.

That is, according to the present embodiment, the discharge temperature control device 10 includes the temperature detector 11 provided in the discharge pipe 5 of the final stage compressor of the multi-stage compressor 1 and the discharge pipe 2 of the preceding stage compressor. A bypass pipe 13 provided to bypass the intercooler 4 between the suction pipe 3 of the latter stage compressor,
Based on the value detected by the temperature detector 11 in order to keep the temperature of the compressed air discharged from the final stage compressor at a certain value or more, which is provided in the bypass pipe 13, the upstream stage compressor to the downstream stage via the bypass pipe 13 A flow rate control valve 14 as a bypass flow rate control means for controlling the flow rate of the compressed air flowing into the compressor.

With such a configuration, the intercooler 4
In order to maintain a constant discharge air temperature of the, the high temperature compressed air that is not cooled by the intercooler 4 is caused to flow from the inlet of the intercooler 4 to the discharge side through the bypass pipe 13, while this flow rate is adjusted by the flow control valve 14. It is something that is adjusted. As a result, the discharge temperature of the multi-stage compressor 1 can be constantly increased to a value equal to or higher than a preset value, and the compressed air transferred to the load demand equipment outside the system can be automatically controlled to be equal to or lower than the preset dew point value. it can.

Therefore, according to the present embodiment, in order to control the temperature of the compressed air (primary side), not the refrigerant (secondary side) but the amount of compressed air flowing to the intercooler 4 is directly adjusted. Since the control is performed, the control efficiency can be improved.

Next, FIG. 2 shows a second embodiment of the present invention.
The whole amount of the high temperature compressed air from the final compressor of the multi-stage compressor 1 is passed through the after-cooler 6 through the discharge pipe 5, and then a part thereof is guided to the adsorbing cylinder 8 during regeneration.
Even in such a configuration, the temperature control of the high temperature compressed air at the outlet of the multi-stage compressor 1 is performed by the bypass pipe 13 of the intercooler 4 and the flow rate control valve 14 as in the first embodiment shown in FIG. Therefore, the same effect as that of the first embodiment can be obtained.

As yet another embodiment, although not shown, in FIG. 1, the discharge pipe 5 of the final-stage compressor of the multi-stage compressor 1 is not branched from the middle and extends independently from the multi-stage compressor 1. The other discharge pipe may be directly connected to the aftercooler 6.

[0023]

As described above, according to the present invention, the discharge temperature control device for a multi-stage compressor facility includes a temperature detector provided in the discharge pipe of the final stage compressor of the multi-stage compressor, and a pre-stage compressor. Between the discharge pipe of the compressor and the suction pipe of the latter stage compressor to bypass the intercooler, and the temperature of the compressed air discharged from the last stage compressor that is provided in this bypass pipe to a constant value. It is a configuration having a bypass flow rate adjusting means for adjusting the flow rate of the compressed air flowing into the post-stage compressor from the pre-stage compressor via the bypass pipe based on the detection value from the temperature detector to be held above. The temperature of the compressed air (primary side) is controlled not by the refrigerant (secondary side) but by directly controlling the amount of compressed air flowing to the intercooler, so the control efficiency can be improved. Effect is achieved.

[Brief description of drawings]

FIG. 1 is a system diagram showing a multi-stage compressor facility according to a first embodiment of the present invention.

FIG. 2 is a system diagram showing a multi-stage compressor facility according to a second embodiment of the present invention.

FIG. 3 is a system diagram showing a conventional multi-stage compressor facility.

[Explanation of symbols]

 1 Multi-stage compressor 2 Discharge pipe of front stage compressor 3 Suction pipe of rear stage compressor 4 Intercooler 5 Discharge pipe of final stage compressor 6 After cooler 7 Adsorption cylinder 8 Adsorption cylinder 9 Drain separator 10 Discharge temperature control device 11 Temperature detection Device 13 bypass piping 14 bypass flow control valve (bypass flow control means)

Claims (1)

[Claims] 1. A multi-stage compressor, an intercooler for cooling compressed air, which is provided between a discharge pipe of a front-stage compressor and a suction pipe of a rear-stage compressor, which constitutes the multi-stage compressor, and a final-stage compressor. A pair of adsorption cylinders that are connected in parallel to the discharge pipes and are alternately used for absorbing and heating and regenerating the compressed air discharged, and the temperature of the compressed air discharged from the multi-stage compressor based on the temperature of the discharged compressed air. In a multi-stage compressor facility equipped with a discharge temperature control device for controlling
The discharge temperature control device is provided so as to bypass the intercooler between the temperature detector provided in the discharge pipe of the final stage compressor and the discharge pipe of the front stage compressor and the suction pipe of the rear stage compressor. A bypass pipe and a pre-stage compression via the bypass pipe provided on the bypass pipe based on the detection value from the temperature detector to keep the temperature of the compressed air discharged from the final stage compressor above a certain value. Multi-stage compressor facility, comprising: bypass flow rate adjusting means for adjusting the flow rate of compressed air flowing from the compressor to the latter-stage compressor.