JPS58195708A - Soot blower - Google Patents

Abstract

PURPOSE:To eliminate a problem such as corrosion of a heat exchanger, by a method wherein, in a device which performs an operation to blow away soot by the jetting of steam through a lance tube inserted into the heat exchanger, a process is provided for discharging drain accumulated in the lance tube prior to the insertion of the lance tube into the heat exchanger. CONSTITUTION:With a motor 10 run by means of a starting signal, a pinion gear 6 spins through the medium of a gear box 5, and the engagement of the pinion gear with a rack 11 moves a lance tube 3 to the right. When the tip of the lance tube 3 reaches a point F in a draining box 21 from a point A, a limit switch 27 is turned ON, the motor 10 temporarily suspends running, and simultaneously, a valve 24 is opened. With this, steam, serving as a blowing means, flows round a valve 1 and flows in a feed pipe 2 through an auxiliary pipe 25. The steam is jetted through a nozzle 4 at the tip of the lance tube 3, and the drain in the lance tube 3 is discharged from a draining pipe 23 through a porous pipe 22 together with the steam. Thereafter, the motor 10 runs again, and the lance tube 3 is inserted into a heat exchanger 12 to perform a given operation to blow away soot.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soot blowing device in which a medium Herance tube such as a heat exchanger is inserted and steam injected from the Lance tube causes a soot-like action.

FIG. 1 shows a conventional soot blower, which will be explained first.

In Fig. 1, (1) is a valve that opens and closes the injection medium, (2) is a injection medium supply pipe connected to the valve (11), and (3) is fixed at one end to the supply pipe (2) and at the other end. A lance tube that can be moved forward and backward, which is inserted into the inside of the heat exchanger, etc. (
4) is one or more nozzles provided at the tip of the lance tube (3). (5) A gear box integrally connected to the crawling/spring pipe (3), in which a pinion gear (6) and a guide roller (7) are arranged in the upper part and the lower part, respectively.

(8) is a casing which supports the guide rod 2 (7) and has a support roller (9) at its tip, and the lance tube (3) is supported by this support roller (9). QQl is an electric motor directly connected to the gear box (5), and the rotation of this electric motor (ill) is decelerated by the Sono monobacterium (51) and transmitted to slowly rotate the 2-ounce tube (3). The binion gear (6) is also rotated, which is a rack fixed to the casing (8) along the lance tube (3), and the binion gear (6) meshes with this rack Oη.

A limit switch is provided on the cage 7 (8) in order to control the range of movement of the lance tube (3) in the forward and backward directions.

The soot blower configured in this way has its front end fixed to a wall box (G) directly fixed to the outer wall (T) of the heat exchanger, and the part near the rear end is suspended depending on the number of support frames. It's been lowered. Therefore, the soot blower is located outside the heat exchanger (6) etc. so that it is always exposed to the outside air.

Next, the operation of the conventional soot blower will be briefly explained.

The soot blower is activated by receiving an activation signal from a remote source or from the machine side, and when the electric motor is rotated by the activation signal, the gear box (5) is valved and the pinion gear (6) is rotated. Since the pinion gear (6) meshes with all racks,
The rack LIIJKG advances to the right in the figure, so that the lance tube (3) is inserted into the heat exchanger (6).

In FIG. 1, the symbol A indicates the vasculature (3
) shows the position of the tip, but when it advances to these B positions, the valve (1) is blown off by the action of a timer (not shown). The lance tube (3) is introduced into the second lance tube (3) and is injected from the □ nozzle (4).The lance tube (3) further advances inside the heat exchanger @, but since the lance tube (3) advances while rotating. , nozzle"'1 (4) where steam exchanges heat. Yaka, work, enemy)・1:□, (A, 2.□□,.

While the lance tube (3) rotates and reciprocates, when its tip reaches position C, the limit switch installed on the front side of the casing (8) hits the advancing gear box (5). The switch is turned on. This limit switch (b) is for reversing, and when turned on, the electric motor moves in reverse. Therefore, the waste pipe (3) moves backward while rotating in the opposite direction. When the tip of the valve (3) retreats to position B, the valve (1) is closed and the injection of steam is stopped. The lance officer (3) continues to retreat (return operation), and when the gear box (5) hits the limit switch u41, the electric motor αQ stops, and therefore the lance tube (3) also stops, ending the entire operation.

In other words, the electric motor QQIKk moves the tooth flat glaze (51) to the limit switch and (141) to reciprocate between point D and point E, which causes the tip of the lance tube (3) to connect to the heat exchanger (6). The soot blowing operation is performed while simultaneously rotating and moving the entire width range of the robot.

By the way, the above-mentioned soot blower type soot blower has a continuous 1' continuous operation, i.e. continuous steam injection and soot blowing operation.

In the case of row 5, it is normal to periodically receive an activation signal and perform the soot blowing operation in the heat exchanger 4 described above.

Therefore, the lance tube (3) waits at the position of point (■) until the next command is issued.

When the soot blower is in a stopped state, the valve (IJ) is closed, and the supply pipe (2) and lance pipe (3) reach the outside temperature.

Therefore, when the soot-blowing operation is finished, the maintenance personnel (2) and the lance pipe (
There is residual steam inside 3), which is converted into a train during standby and transferred to the supply pipe (2) and the lance (3) at V3=p.

(b) At the next startup, when the valve (IJ) opens at three points and injection starts, the steam in the pipe will last until the temperature of the supply w(2) and outlet pipe (3) rises. condenses and generates a large amount of drainage.

Since the drain generated from the Gel port 1 is ejected from the nozzle (4) together with steam into the heat exchanger 4,
There are many problems such as the corrosive atmosphere corroding and corroding the constituent materials of the heat exchanger, and the fact that they are covered by drains, and the impact on carbon steel is particularly large. there were.

In order to prevent the corrosion and abrasion of the heat exchanger 6d component materials caused by condensate as described above, the present invention provides a condensate cutter that can handle condensate without blowing it into the heat exchanger. This was made for the purpose of providing a soot blowing device with a pull-out type.

Hereinafter, the Ikshōshi effect of the present invention will be explained in detail by referring to the second example, or in FIG. 2, the same parts as in FIG. The explanation will be omitted.

The inventive soot blowing device shown in FIG. 2 is different from the conventional device shown in FIG. The establishment of υ is a big standby (・ru.

That is, the drain-cut glaze y has a 2xm structure with a perforated pipe (4) inside it, and a drain extraction pipe is provided on the lower outer wall. The lance pipe (3) then reciprocates from the wall box to the four sides of the heat exchanger within the perforated hole (a) of the drain cut box c2.

Furthermore, the uninvented soot blowing device is provided with an auxiliary pipe (c) and a blower tube (indicated by cIAJ) so that the injection medium can bypass the valve (1). In addition, the casing (8) is equipped with a limit switch (141) to the right; an intermediate limit switch (robot) that obtains a signal to temporarily stop the li/s pipe (3) at the lower position in the drain cutter box η; ) is provided.Other configurations are the same as the conventional one.

Next, the operation will be explained.

When the electric motor 1 (10) is started in response to a start signal from a remote source or from the machine side, the lance tube (3) moves to the right in the figure together with the gear box (5). When the tip of the lance tube (3) is poured from point A in the wall box to point F in the drain cutoff box ψη, the gear box (5) is in the middle of the mitt switch ■θ
At this time, the electric motor (field) is temporarily stopped by a signal from the limit switch (limit switch).At the same time, the valve (c) is opened.
is a solenoid valve, for example, and operates to open upon receiving a signal from the limit switch θ.

When the valve ■ opens, the steam generated by the injection medium is pulp (1):1
'1・1).

It flows into the supply pipe (2) through the auxiliary pipe (c), the valve (c), and the flow pipe), and is ejected from the nozzle (4) at the tip of the lance pipe (3). Here, since the nozzle (4) is located in the same hole as the drain cutter box c7υ, steam is ejected into the hole tube. At this time, the drain trapped in the lance pipe (3) is also jetted out from the nozzle (4) together with the steam, and the drain and moist steam are discharged to the outside from the drain extraction pipe through the porous pipe section.

Valve (2) is kept open until the supply pipe (2) and lance pipe (3) reach a predetermined temperature. Since this heating time differs depending on the temperature of the injection medium, the type of soot blower, etc., it is controlled by a variable timer or the like that can set the operating time according to the situation. Therefore, until the temperature of the supply pipe (2) and lance pipe (3) rises, the drainage/drainage generated inside the supply pipe (2) and lance pipe (3) is discharged from the nozzle (4) together with steam. It squirts into the porous pipe (A) and is discharged to the outside from the drain pipe.

When the temperature of the supply pipe (2) and run h pipe (3) rises to a predetermined temperature of 1 ML degree, the valve (c) is closed, the Doretsu Pass operation is completed, and the electric motor section is operated again. The soot tube (3) is inserted into the heat exchanger U, and when the tip reaches point B, the pulp (1) is opened in the same way as in the conventional method and a predetermined soot blowing operation is started.

When the tip of the lance tube (3) reaches the zero point, the electric ha (2) starts rotating in the opposite direction by a signal from the limit switch (b), and the lance tube (3) moves backward. Lance tube (
When the tip of the gearbox (3) retreats to point B, the knob (1) closes and the soot blowing operation ends, but the knife (3) continues to retreat and when it reaches the stop position, the gear box (5) ) hits the limit switch C141, stopping the electric motor (10) and ending the entire operation.

Since the soot blower is constantly exposed to the atmosphere, a large amount of condensate and moist steam is ejected from the time the injection starts until the supply pipe (2) and lance pipe (3) ascend. do. As a result, the constituent materials of the heat exchanger in the corrosive atmosphere are often corroded, and the drain often causes abrasion.

However, in the present invention, in order to solve these problems, the supply pipe (2) and lance pipe (3) are removed before the soot blowing work inside the heat exchanger.
), and the drain and moist steam generated during the temperature rise are received by the drain cutter box (b) and the perforated pipe (a), and then discharged to the outside by the drain outlet pipe (c). Condensate and wet steam injection within the heat exchanger are eliminated, and the above-mentioned problems can be solved.

It goes without saying that the present invention is not limited to the above-mentioned embodiment, but can be implemented with various modifications without departing from the scope of the invention. For example, various known control means can be used to start and stop the electric motor (10), open and close the pulp (11, valve (c), etc.), and the supply pipe (2), lance W (3), etc.
The preheating of the pulp (1) can also be carried out by controlling the pulp (1) itself to be temporarily opened without using the bypass path of the pulp (1).

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional soot blowing device, and FIG. 2 is a configuration explanatory diagram showing an embodiment of the soot blowing device according to the present invention. (1) Pulp, (2) Supply pipe, (3) Lance pipe, (4) Nozzle, (8) Casing, (6
)...Heat exchanger, (g)...Wall box, el)
・・Drain cutting box, (a) ・・Porous pipe, ・・Drain extraction pipe.

Claims (1)

[Claims] 1. A soot blower comprising a drain cutter box attached to the tip of the soot blower and having a through hole for a lance pipe, and a drain extraction pipe communicating with the drain cutter box.