JPH0341118Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-stage compressor, and in particular to a mist separator that discharges a portion of the hot gas compressed in the upper stage compression section and drain water adhering to the cooler. A multi-stage compressor that enables bypass from the upstream passage to the downstream passage, and can heat and evaporate drain water and cooled moist gas scattered downstream from the mist separator using a portion of the hot gas. Regarding.

[Prior Art] In general, multistage compressors include a type with a built-in cooler as shown in FIGS. 3 and 4, or a type with a separate cooler as shown in FIGS. 5 and 6.

For example, in the case of a built-in cooler type, as shown in FIG. 3, a multi-stage compressor casing 1 is provided. This casing 1 is provided with a rotating shaft 2 extending from its suction port 1a to its discharge port 1b.

A plurality of impellers 3 forming a compression section are provided on the rotating shaft 2 in a multi-stage configuration along the axial direction. These impellers 3 are communicated with each other by a passage 4, and the suction gas is sequentially compressed through the passage 4 from the upper impeller 3 on the side of the suction port 1a to the lower impeller 3 on the side of the discharge port 1b.

Further, as shown in FIGS. 3 and 4, a cooler 5 is interposed in the passage 4 connecting each impeller 3 in order to improve the compression efficiency of the compressed hot gas. The cooler 5 introduces cooling water into a cooling tube formed by a cooling tube bundle 5a, and cools the hot gas by exchanging heat with the hot gas compressed by each impeller 3.

The cooler 5 has a mist separator 6 on its downstream side.
is provided. This mist separator 6 is provided so as to cross the passage 4a on the downstream side of the cooler 5, and is configured to collect drain adhering to the cooler 5 and discharge it to the outside of the system.

[Problems to be solved by the invention] By the way, when trying to completely remove the drain generated in the cooler 5 with the mist separator 6 provided on the downstream side, the pressure of the cooled gas passing through the mist separator 6 increases. Loss tends to increase, and the mist separator 6 tends to increase in size.

Therefore, in the conventional multi-stage compressor, the mist separator 6 cannot completely remove the condensate generated in the cooler 5, and the condensate and cooled moist gas that pass through the mist separator 6 and scatter to the downstream side thereof. As a result, corrosion and erosion occur in the impeller 3 and the like on the downstream side, resulting in problems such as a decrease in compressor efficiency and a shortened lifespan.

[Purpose of the invention] The present invention was created to effectively solve problems in conventional multi-stage compressors.

The purpose of this invention is to prevent corrosion or erosion of the compressor section, etc. installed on the downstream side due to drain water or moist gas that passes through the mist separator and scatters downstream. The object of the present invention is to provide a multistage compressor that can maintain high efficiency and extend its life.

[Summary of the invention] In order to achieve the above object, the present invention includes a passage for transferring compressed hot gas from an upper compression section to a lower compression section, and a passage for transferring hot gas to the upstream side of the passage. A multi-stage system with a cooler installed on the upstream side to cool the hot gas, and a mist separator placed across the cooler on the downstream side to discharge drain water adhering to the cooler to the outside of the system. In the compressor, a sealing member is provided between the inner wall of the passage for transferring the hot gas and the cooler, and the sealing member has a bypass hole for bypassing a portion of the hot gas in the passage downstream of the mist separator. This is a configuration in which the drain water splashing downstream from the mist separator and the cooled moist gas flowing down are heated by a portion of the hot gas and evaporated.

[Example] An example of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, a passage 4 is provided for transferring compressed hot gas A from the upper compression section to the lower compression section.

A cooler 5 is provided within the passage 4 to cool the hot gas A passing therethrough. The cooler 5 is designed to cool the hot gas A with cooling water passing through the cooling tube bundle 5a.

Further, the cooler 5 for cooling the hot gas A is provided with mist separators 6 stacked one on top of the other so as to cross the passage 4a on the downstream side thereof. The mist separator 6 collects the drain water B that adheres to the hot gas A when it passes through the cooler 5, drops it below the drain water B, and discharges it out of the compression system.

In particular, in the present invention, a gasket 7 is provided as a sealing member between the inner wall of the passage 4 for transferring the hot gas A and the cooler 5, and
A plurality of bypass holes 7a are formed in this gasket 7. As shown in the figure, the gasket 7 is formed by folding back its central portion in the longitudinal direction to have an L-shaped cross section. Further, the bypass hole 7a is formed by elongated holes appropriately spaced along the fold line of the gasket 7, and the bypass hole 7a is connected to the cooler 5.
The mist separator 6 is formed in such a size that it does not prevent the hot gas A passing through the side of the mist separator 6 from passing downstream of the mist separator 6.

That is, a part of the hot gas A from the upstream passage 4b of the mist separator 6 is transferred to the downstream passage 4a of the mist separator 6 through the bypass hole 7a.
A bypass passage 8 is formed that bypasses and introduces the water.

By forming such a bypass passage 8, the hot gas A bypassed and introduced into the downstream passage 4a of the mist separator 6 via the bypass passage 8 is dispersed into the drain water B scattered downstream from the gasket 7. It mixes with the moist gas cooled by the cooler 5 and passes through the gasket 7 to heat and evaporate them.

As a result, dry cooling gas with no moisture is transferred to the downstream side of the mist separator 6, and corrosion of the lower impeller, etc. provided on the downstream side is avoided and proper operation is performed. will be protected.

In this way, the present invention forms the bypass passage 8 that bypasses and introduces a part of the hot gas A from the upstream passage 4b into the downstream passage 4a of the mist separator 6, thereby eliminating the drain scattered to the downstream side of the mist separator 6. Water B etc. can be heated and evaporated, corrosion or erosion of the impeller etc. on the downstream side can be prevented, and a longer life and higher efficiency of the compressor can be achieved.

[Effects of the invention] In summary, according to the invention, by forming a bypass passage that bypasses and introduces a part of the hot gas from the passage upstream from the mist separator into the passage downstream from the mist separator, the mist separator Drain water splashed downstream can be heated and evaporated, preventing corrosion or erosion of the impeller, etc. on the downstream side, extending the life of the compressor and increasing efficiency.
A seal member is provided between the inner wall of the passage for transferring the hot gas and the cooler, and a bypass hole is formed in the seal member to bypass a part of the hot gas, so that the bypass passage can be formed with a simple structure. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing the main parts of an embodiment of the present invention, Fig. 2 is a schematic front view showing a gasket, Fig. 3 is a schematic view showing a multi-stage compressor, and Fig. 4 is the same as Fig. 3. A schematic diagram showing the main parts, and FIGS. 5 and 6 are diagrams showing another type of multi-stage compressor. In the figure, 4 is a passage, 5 is a cooler, 6 is a mist separator, 8 is a bypass passage, A is a hot gas, and B
is drain water.

Claims (1)

[Scope of utility model registration request] A cooler for cooling the hot gas is provided on the upstream side of the passage for transferring the compressed hot gas from the upper compression section to the lower compression section, and the passage crosses this on the downstream side of the cooler. In a multi-stage compressor provided with a mist separator for discharging drain water that overlaps and adheres to the cooler to the outside of the system, a sealing member is provided between the inner wall of the passage for transferring the hot gas and the cooler, and the sealing member is provided between the inner wall of the passage for transferring the hot gas and the cooler. A multi-stage compressor, characterized in that a member is provided with a bypass hole in a passage downstream of the mist separator for bypassing a portion of the hot gas.