JPH076624B2 - Soot blower device having drain separating means - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application> The present invention relates to a device for separating drain from steam, and more particularly to a drain separating means suitable for use by being arranged in a steam supply system for a device such as a soot blower. The present invention relates to a sootblower device.

<Prior Art and Problems Thereof> Taking a boiler as an example, a soot blower is used to remove soot and ash (hereinafter referred to as “dust”) adhering to the heat transfer surface of the boiler. The soot blower injection medium is air or steam, but the steam type does not require a special device such as a blower as compared to the air type, and the steam generated by the boiler can be used as is, so the equipment cost,
The operating cost will be lower. Further, in the air type, when a large amount of air is supplied, there is a fear that the air-fuel ratio of the boiler may be affected, and the steam type is widely adopted.

However, in the steam system, part of the steam becomes drain water due to heat dissipation in the piping. When this drain is sprayed on the dust-laden pipe, it causes problems such as moistening the dust and fixing the dust to the pipe, or thinning the pipe by erosion. For this reason, a drain trap or drain valve is arranged at the end of the mother pipe of the soot blower pipe to discharge the generated drain water. However, in addition to the above problems, the soot blower device is arranged in the boiler heat transfer pipe with a branch pipe for the soot blower, so part of the drain water may remain in the branch pipe and drain water may be discharged from the soot blower at the initial stage of injection. . Therefore, when the injection frequency is high (especially in a coal-fired boiler), there is a problem that sulfuric acid is generated due to the moisture and the S content in the exhaust gas, which causes corrosion in the heat transfer tube.
For this reason, conventionally, soot blower piping has been adopted in which steam is passed through for heating before heating so as to warm the pipe and reduce the amount of heat released during supply. However, it is difficult to sufficiently warm the branch pipes that branch from the supply mother pipe to the branch pipes that supply steam to each soot blower, and drains are often generated especially in the branch pipes. Therefore, as shown in FIG. 5, the branch pipe 5 for supplying steam to the soot blower 6 is provided with a gradient to descend to the mother pipe 2 side, that is, a drain gradient so that the generated drain flows to the mother pipe 2 side. ing. However, due to the strong steam flow at the soot blow, the blow water generated above flows backward and the soot blower 6
The situation that it is often jetted from is not able to solve the problem fundamentally. If a drain separator is placed in each pipe, this problem can be solved, but the equipment cost increases significantly, and there are some parts where the drain separator cannot be placed due to the structure.

<Object of the present invention> The present invention is configured in view of the above-mentioned problems, and provides a small-sized and high-performance drain separator suitable for being arranged in a steam supply system of a sootblower. With the goal.

<Summary of the present invention> In short, the present invention is to install a valve body having a flange on the steam receiving side at the steam inlet of a sootblower device, and to connect the flange of the valve body to the flange of the steam supply pipe connected to the valve body. It is characterized in that a drain separator having a cylindrical lid shape protruding into the steam chamber and having a plurality of small holes on the side surface is provided, and a drain drain pipe for discharging the drained separated drain along the inner wall of the drain separator is provided. It is a soot blower apparatus which has a drain separation means.

<Embodiment> FIG. 4 shows a conventional soot blower valve, which is the basis of the present invention, and is mounted at the inlet of the soot blower. In the figure, reference numeral 51 is a valve body, 52 is a flange joined to this body,
Reference numeral 55 denotes a valve body that opens and closes depending on the soot blower withdrawal position. When the soot blower tube advances, the valve rod 57 is lowered by a link mechanism (not shown) to open the valve body 55 and inject steam S from the tube through the outlet 56. To do. In such an apparatus, since the supplied steam radiates heat through the tube, it is desirable to separate the drain as soon as possible before the injection. That is, if the drain water is separated at a position away from the soot blower, the drain water is generated again due to heat dissipation before reaching the soot blower, and it may be meaningless to separate the drain water.

1 and 2 show an embodiment of the present invention. Reference numeral 10 is a valve body, 11 is a valve rod arranged in the valve body, and 12 is a valve element attached to this valve rod. Reference numeral 13 is a trigger for actuating the valve rod 11, which is connected to a soot blower with a tube (not shown). When the tube moves forward, the valve rotates in the direction of the arrow, and the valve rod 11
The valve body 12 is opened by pressing. Next, reference numeral 14 is a drain separator disposed in the steam chamber 5 located upstream of the valve body 12 in the valve body. This drain separator is attached to a valve body flange 16 forming a part of the steam chamber 15. The drain separator 14 has a substantially cylindrical shape, and a plurality of small holes 14a for steam outflow are formed in the side wall of the drain separator 14. This drain separator, when the steam that has flowed into the separator is jetted from the small holes, a vortex flow is generated in the separator, whereby large water particles are shaken off, and only steam is supplied into the steam chamber 15.
It is configured to be separated from the drain. in this case,
The number of small holes formed, the opening area, etc. are determined by the pressure difference inside and outside the drain separator, but the pressure difference between the two is 0.5 kg / cm ² to 0.2.
About kg / cm ² is appropriate, and the hole diameter is 10 mm, depending on the injection amount.
ψ ~ 13 mm ψ is suitable.

When the sootblower is operated in the device having the above-mentioned configuration, the trigger 13 is tilted by the forward movement of the tube of the sootblower, and the valve body 12 is opened by the valve rod 11. As a result, the steam in the branch pipe 5 separates the drain in the drain separator 14, then flows into the tube of the soot blower through the steam chamber 15 and the outlet passage 17, and is injected to a predetermined place. On the other hand, a drain pipe 18 is connected to this branch pipe (see FIG. 2), and the separated drain flows down along the inner wall of the drain separator 14 and is discharged from the drain branch pipe 18 to the outside. .

FIG. 3 shows a state in which the apparatus 20 having the above configuration is arranged in the steam supply system of the soot blower 6. Drain separation device that is a valve
20 is attached just before the entrance of each sootblower 6,
The drain pipe 18 is expanded from each drain separating device 20, merges with one drain main pipe 21, and then the drain is discharged to the outside through the permanent leak orifice 22.

In this sootblower system, the steam main valve 23, the drain valve 24, and the inlet valve 25 of the drain trap 26 are opened to supply steam from the steam supply source 1 prior to performing sootblowing. At this time, the soot blower inlet valve which is the drain separator 20 is closed. When the steam is supplied, a warm pipe is centered around the steam supply mother pipe 2, and when the temperature of the wall of the mother pipe 2 reaches a specified temperature, the drain valve 24 is closed by the temperature controller 27, and at the same time. The separation device 20 is opened and soot blowing is performed. In this case, the branch pipe 5 is not sufficiently warmed up, and there is a risk that drainage will occur at the start of soot blower operation.
The drain separated by 14 and separated is discharged to the outside through the drain pipe 18, the mother pipe 21, and the permanent orifice 22. In the illustrated case, the steam used for the warm pipe is discharged to the outside of the system together with the drain. However, it is of course possible to return the steam to a boiler component such as a boiler drum.

<Effects> By carrying out the present invention, when supplying steam to the soot blower, it is possible to separate the drain in advance and inject only the steam, so that corrosion occurs at the soot blown portion and the downstream side thereof. Can be avoided.

[Brief description of drawings]

1 is a sectional view of a drain separation device showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is an arrangement system diagram of the device shown in FIG. FIG. 4 is a sectional view of a conventional sootblower inlet valve, and FIG. 5 is a system diagram showing the arrangement of the inlet valve of FIG. 5 ... Branch pipe, 6 ... Soot blower 10 ... Valve body, 12 ... Valve body 14 ... Drain separator, 15 ... Steam chamber

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References: Showa 58-71533 (JP, U) Showa 55-180142 (JP, U) JP 47-50882 (JP, B1) Patent 73363 (JP, JP, C1)

Claims (1)

[Claims] 1. A cylinder that projects a steam chamber of a valve body to a flange of a steam supply pipe connected to the valve body by mounting a valve body having a flange on the steam inlet side of the soot blower device. A soot blower having a drain separating means, characterized in that a drain separator having a lid-like shape and having a plurality of small holes on the side surface is provided, and a drain discharge pipe for discharging the separated drain flowing down along the inner wall of the drain separator is provided. apparatus.