JP3619306B2 - Dust removal device for flush water drain hopper in rotary regenerative heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to water washing in a rotary regenerative heat exchanger that can remove dust and the like accumulated on the surface of a heat transfer element of a rotary regenerative heat exchanger used in a power plant or the like without stopping the plant. The present invention relates to a dust removal device for a water drain hopper.
[0002]
[Prior art]
Generally, in a heat transfer element of a rotary regenerative heat exchanger used in a power plant or the like, a fluid flow path is clogged due to adhesion of dust or the like during operation, resulting in an increase in pressure loss. In this case, steam or air is sprayed from the soot blow in order to remove dust adhering to the surface of the heat transfer element. If dust cannot be removed sufficiently using soot blow, stop the plant and wash with water.
[0003]
[Problems to be solved by the invention]
However, in recent years, there are many cases where the plant cannot be stopped due to various circumstances. As a countermeasure in this case, a device capable of being washed even during plant operation has been developed (Japanese Patent Laid-Open No. 61-289296) and put into practical use. However, dust or the like accumulates at the drain of the hopper that discharges waste water to the outside. As a result, the hopper fills the hopper, eventually overflows from the hopper and flows downstream of the heat exchanger, adversely affects various downstream equipment, and the hopper mechanically. Exceeding strength can cause damage to the hopper duct or expansion. There is no specific technique for this, and the fact is that the water washing operation during operation must be abandoned.
[0004]
The present invention has been made in order to solve the above-described conventional problems. The purpose of the present invention is to inject backwash water in the vicinity of the drain outlet of the flush water drain hopper to close the drain outlet. An object of the present invention is to provide a dust removal device for a flush water drain hopper in a rotary regenerative heat exchanger capable of smoothly draining flush water during operation by removing dust and the like.
[0005]
[Means for Solving the Problems]
In the rotary regenerative heat exchanger according to the present invention, the washing water drain hopper dust removing device connects the fluid inlet / outlet reducer ducts above and below the housing containing the rotor loaded with the heat transfer element, and the reducer duct on the high temperature fluid side In the rotary regenerative heat exchanger in which a flushing device is arranged, a flush water drain hopper is connected below the lower reducer duct, and a hopper drain and a drain valve are arranged at the bottom of the hopper, the hopper drain A backwash water pipe is connected between the mouth and the drain valve, and a backwash valve is provided in the backwash water pipe. An overflow drain and a drain valve are arranged at the top of the hopper, a backwash water pipe is connected between the overflow drain and the drain valve, and a backwash valve is provided in the backwash water pipe. Features.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a housing of a rotary regenerative heat exchanger that accommodates a rotor 2. A heat transfer element 3 is loaded in the rotor 2. A low temperature fluid inlet reducer duct 4, a low temperature fluid outlet reducer duct 5, a high temperature fluid inlet reducer duct 6 (imaginary line) and a high temperature fluid outlet reducer duct 7 are connected to the housing 1. The low-temperature fluid is, for example, external air in a boiler plant and a processing gas in a desulfurization plant, and the high-temperature fluid is, for example, exhaust gas in a boiler plant and untreated exhaust gas in a desulfurization plant.
[0007]
As shown in FIG. 2, a high-pressure water washing device 8, a soot blower 9 and a stationary water washing device 10 are arranged in the high-temperature fluid inlet reducer duct 6, and the high-temperature fluid outlet reducer duct 7 also has a high pressure. A water washing device 11, a soot blower 12, and a stationary water washing device 13 are arranged. During plant operation, dust and the like adhering to the surface of the heat transfer element 3 are periodically removed by the soot blows 9 and 12, and water washing is performed by the stationary water washing devices 10 and 13 when the plant is stopped. The high-pressure water washing devices 8 and 11 can be washed even during operation.
[0008]
A duct 14 is connected below the high-temperature fluid outlet reducer duct 7, and a flush water drain hopper 15 is connected below the duct 14. A hopper drain port 16 and a drain valve 17 are disposed at the bottom of the flush water drain hopper 15. Between the hopper drain 16 and the drain valve 17, a backwash water pipe 18 is connected. 19 is a backwash valve.
[0009]
An overflow drain port 20 and a drain valve 21 are disposed above the flush water drain hopper 15. A backwash water pipe 22 is connected between the overflow drain 20 and the drain valve 21. 23 is a backwash valve.
[0010]
Next, the operation of the above-described embodiment apparatus will be described. First, before starting water washing, the backwash valve 23 is opened with the drain valves 17 and 21 and the backwash valve 19 closed, and dust and the like clogged in the overflow drain 20 are backwashed and removed. After completion, the backwash valve 23 is closed.
[0011]
Subsequently, the drain valve 21 is opened, the drain valve 17 is closed, and the backwash valve 19 is opened to remove dust and the like clogged inside the drain port 16 of the flush water drain hopper 15.
[0012]
Further, after pouring water into the flush water drain hopper 15 and confirming with the sight flow gauge 25 that drainage overflows from the overflow drain port 20 and flows into the drain pit 24, the backwash valve 19 is turned on. Close and open the drain valve 17 at once to drain water.
[0013]
The above operation is repeated 2-3 times, and after confirming that the drainage is performed smoothly, the operation of the high-pressure water washing apparatuses 10, 13 is started. Even during washing with these high-pressure washing apparatuses 10 and 13, the drain outlet 16 may be clogged with dust on the heat transfer element, dust attached to the wall surface inside the duct 14, etc. at the initial stage of washing. Regularly.
[0014]
In FIG. 2, 27 is a high-pressure washing water pipe connected to a high-pressure jet pump (not shown), 28 is a steam pipe, 29 is a washing water pipe, and 30 is a washing water pit. It is.
[0015]
【The invention's effect】
By providing a backwashing water injection port in the washing water drainage hopper, and removing clogging due to dust etc. before and during the water washing, drainage of the washing water during the water washing during plant operation is ensured It became possible to discharge from the drain.
[Brief description of the drawings]
FIG. 1 is a perspective view in which a part of a rotary regenerative heat exchanger is cut away.
FIG. 2 is a schematic cross-sectional view of a rotary regenerative heat exchanger provided with an embodiment of the dust removing apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Rotor 3 Heat transfer element 4 Reducer duct for low temperature fluid inlet 5 Reducer duct for low temperature fluid outlet 6 Reducer duct for high temperature fluid inlet 7 High temperature fluid outlet reducer duct 8 High pressure flushing device 9 Soot blow 10 Stationary flushing device 11 High pressure flushing device 12 Soot Blow 13 Stationary Flushing Device 14 High Temperature Fluid Outlet Duct 15 Flushing Water Drain Hopper 16 Hopper Drainage Port 17 Drain Valve 18 Backwash Water Pipe 19 Backwash Valve 20 Overflow Drain Port 21 Drain Valve 22 Backwash Water Pipe 23 Backwash Valve 24 Drainage pit 25 Site flow gauge 26 Cryogenic fluid inlet duct 27 High pressure flush water pipe 28 Steam pipe 29 Flush water pipe 30 Wash water pit

Claims (2)

A fluid inlet / outlet reducer duct is connected to the upper and lower sides of the housing containing the rotor loaded with the heat transfer element, a flushing device is arranged in the reducer duct on the high temperature fluid side, and a flush water drainage hopper is located below the lower reducer duct. In the rotary regenerative heat exchanger having a hopper drain port and a drain valve arranged at the bottom of the hopper, a backwash water pipe is connected between the hopper drain port and the drain valve, and the backwash water A dust removal device for a flush water drain hopper in a rotary regenerative heat exchanger, characterized in that a backwash valve is provided in the piping for use. An overflow drain port and a drain valve are arranged at the upper part of the hopper, a backwash water pipe is connected between the overflow drain port and the drain valve, and a backwash valve is provided in the backwash water pipe. The dust removing device for a flush water drain hopper in the rotary regenerative heat exchanger according to claim 1.

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