JPS6371585A - Dryness adjusting method and device at inlet of steam compressor - Google Patents

Abstract

PURPOSE:To reduce the necessary power and to eliminate damage due to mist, by spraying cooling liquid to steam prior to supply to a steam compressor and forming an unbalanced steam containing mist, while furthermore adjusting the grain size of the mist and feeding the steam. CONSTITUTION:In a low pressure steam Sl supply path 2, a spray device 4 is arranged at the upstream side in an enclosed container 3 disposed at the inlet portion of a compressor 1, and cooling liquid L is sprayed into the low pressure steam Sl to form an unbalanced steam containing mist M. A demister 5 which can adjust the grain size of the mist M is arranged at the downstream side so as to recover the mist having large grain size thus feeding low pressure steam Sl containing only small grain size mist M. Since the mist evaporates sequentially in the compression stroke of the compressor 1, temperature rise of steam is suppressed and high pressure steam Sh of proper temperature is produced. Consequently, power consumption is reduced and damage of cylinder due to large grain size mist can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method and apparatus for adjusting inlet steam dryness of a vapor compressor for obtaining high pressure steam from low pressure steam.

[Prior art]

As a means for obtaining steam from a relatively low-temperature heat source, a method has been proposed in which low-pressure, low-temperature steam is supplied into a reciprocating cylinder device, and the steam is compressed to produce high-temperature, high-pressure steam.

However, since this method adiabatically compresses the steam sealed in the cylinder, there is a problem that a large amount of power is required for the compression, and the amount of steam produced relative to the supplied power is small, making it inefficient.

Furthermore, the obtained steam is often at a higher temperature than the steam to be used, and this temperature needs to be adjusted.

Therefore, in order to reduce the power required for adiabatic compression as described above and to obtain steam at a temperature that can be used immediately, a cooling liquid is sprayed with a spray valve during the process of compressing steam with a steam compressor, and the temperature of the steam is The invention of Japanese Patent Application No. 51-63487 has been made regarding a vapor compressor whose rise can be controlled.

In other words, the inlet steam of a vapor compressor has generally been superheated steam, but if this inlet steam is made into wet steam that does not cause any harm to the operation of the steam compressor, the compressor power will be reduced compared to when superheated steam is taken in. It is known that compressor power can be reduced by

However, in the vapor compressor of the above-mentioned patent application No. 59-634.87, since the cooling liquid is sprayed inside the vapor compressor,
There is a problem in that it is not possible to adjust the particle size of the mist contained in the steam, and if the mist contains large particles, it may harm the cylinder of the vapor compressor.

[Purpose of the invention]

The present invention solves the problems associated with spraying a cooling liquid into the steam when compressing the conventional steam, reduces the required power, and provides high-temperature steam that can be used immediately. It is an object of the present invention to provide a method and apparatus for adjusting inlet steam dryness of a vapor compressor.

[Structure of the invention]

In order to achieve the above object, the method for adjusting the inlet steam dryness of a vapor compressor of the present invention sprays a cooling liquid to the vapor before being supplied to the vapor compressor to form non-equilibrium vapor containing mist, Furthermore, the particle size of the mist is adjusted with a demister before being supplied to the steam compressor.The steam dryness adjustment device to which this method can be applied is also suitable for the vapor compression of the steam supply pipe. A cooling liquid spraying device capable of forming non-equilibrium steam including mist is installed on the upstream side of the steam flow path in the airtight container formed at the machine inlet, and the mist particle size is adjusted on the downstream side. It is constructed by interposing a possible demister.

〔Example〕

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic side sectional view of an inlet steam dryness adjustment device of a vapor compressor according to an embodiment of the present invention, and FIG. FIG. 2 is an equipment configuration diagram of a vapor compressor that employs the device.

First, as shown in FIG. 2, a first A hermetic container 3 shown in the figure is formed, a spray device 4 is provided on the upstream side of the steam flow path in this hermetic container 3, and a cooling liquid is sprayed into the low-pressure steam SR from there. Trying to form steam.

Next, a demister 5 whose particle size of the mist M can be adjusted is interposed on the downstream side of the steam flow path in the airtight container 3, and the mist M
The particles having a large particle size are collected from the moisture recovery port 6 as an excess moisture recovery flow, and the particles having a particle size of about 10 microns, for example, whose particle size is adjusted by the inlet steam dryness adjustment device 7 having the above configuration. Low-pressure steam SZ containing only diameter error) M is supplied to the steam compressor as shown in FIG.

As mentioned above, the low-pressure steam SR containing M is L+ of the reciprocating steam compressor 1 shown in FIG.

It evaporates sequentially in each compression stroke indicated by Lx, Ls, and Lm, and becomes high-pressure steam sh at the compressor outlet temperature, but the temperature rise of high-pressure steam sh can be suppressed due to the evaporation of M.
As a result, the power consumption of the vapor compressor 1 can also be reduced.

That is, in the compression start stroke of steam compressor 1 in Figure 3, as shown in Figure 3-A, water droplets of mis-1-M are mixed into the low-pressure steam SA, resulting in a non-equilibrium state. However, in the compression stroke indicated by L2, as shown in Figure 3-B, the particle size of the water droplets of the mist M becomes smaller due to evaporation, for example, the droplet diameter becomes 5 microns or less, and furthermore, in the compression stroke indicated by L3, the particle size of the water droplets of the mist M becomes smaller due to evaporation, and in the compression stroke indicated by L3, the particle size of the water droplets becomes smaller due to evaporation. As shown in Figure -0 (most of the water droplets in the mist M disappear and a state of thermal equilibrium is reached, and in the final step L4, all the mist M becomes superheated steam).

Next, FIG. 4 shows a relationship diagram between the demister population flow rate and the maximum particle diameter at the demister outlet based on the performance experiment results of the demister 5 used in the inlet steam dryness adjustment device 7, and the demister Once the structure of -5 is determined, the maximum particle size of the mist M at the demister outlet can be adjusted by adjusting the inlet flow rate.

Furthermore, FIG. 5 is a diagram comparing the conventional vapor compressor of the above-mentioned Japanese Patent Application No. 59-63487 and the case using the method of the present invention using a P-h diagram of pressure P and enthalpy h. In the figure, the saturated steam line, wet steam region, and superheated steam region are shown, but in the conventional example, the p-h diagram for the compression stroke that progresses from No. 3 to L3 is shown by solid lines A and -C. On the other hand, if the present invention is adopted, the broken line becomes A-C', and it can be seen that less power is required to obtain the same pressure.

In addition, as the cooling liquid sprayed from the spraying device 4 of the present invention, any liquid such as water, fluorocarbon, or ammonia may be used.

Furthermore, as explained in the above embodiments, the reciprocating type is optimal for the vapor compressor 1 used in the present invention.
The present invention is not limited to this, and can be similarly applied to compressors such as a screw set, a vane type, and even a turbo compression type.

C Effects of the Invention As explained above, by adopting the method and apparatus of the present invention, temperature rise can be suppressed when pressurizing low-pressure steam with a vapor compressor, so high-pressure steam can be obtained at a temperature that can be used immediately. As a result, the power consumption of the vapor compressor can be reduced.

Furthermore, in the present invention, a mist is formed in the steam before being supplied to the vapor compressor, and the particle size of the mist can be adjusted more easily than in the conventional method in which the mist is formed in the vapor compressor. This method has the advantage that it is easy to use, and in particular, large-sized mist that may harm the cylinder or the like can be removed before being supplied to the compressor.

[Brief explanation of the drawing]

FIG. 1 is a schematic side sectional view of an inlet steam dryness adjustment device for a vapor compressor according to an embodiment of the present invention, FIG. 2 is an equipment configuration diagram of a vapor compressor adopting the device shown in FIG. 1, and FIG. 3 is an explanatory diagram of the compression stroke in the vapor compressor of Fig. 2, Fig. 3-A,
Figures 3-B and 1-C are explanatory diagrams showing the state of the mist in each step in Figure 3, and Figure 4 is an illustration of the demister in Figure 1.
FIG. 5 is a diagram showing the relationship between pressure and enthalpy in the compression stroke in the present invention and the conventional example. ■... Vapor compressor, 2... Steam supply pipe, 3...
Airtight container, 4... Spray device, 5... Demister-17
...Inlet steam dryness adjustment device, L...Cooling liquid, M.
··mist.

Claims (1)

[Claims] 1. Spray a cooling liquid on the steam before it is supplied to the vapor compressor to form non-equilibrium vapor containing mist, further adjust the particle size of the mist with a demister, and then perform vapor compression. How to adjust the dryness at the inlet of the steam compressor that supplies the steam to the machine. 2. A cooling liquid spraying device capable of forming non-equilibrium vapor including mist is provided on the upstream side of the vapor flow path in the closed container formed at the vapor compressor inlet of the vapor supply pipe, and a cooling liquid spraying device capable of forming non-equilibrium vapor including mist is provided on the downstream side thereof. A vapor compressor inlet dryness adjustment device equipped with a demister that can adjust the mist particle size.