JPH0533918A - Blast opening-cleaning device - Google Patents

Abstract

PURPOSE:To automatically remove smelt adhering to the periphery of an air blast opening for a soda-collecting boiler, without the checking of an operator. CONSTITUTION:A steam-ejecting nozzle 12 is provided at the front of an air blast opening 11 and is placed in an air casing 13. The steam-ejecting nozzle 12 is also provided at the top part of a branch pipe line 15 branching from a steam line 14 and an electrically operated valve 16 is provided in the middle of the branch pipe line 15. Furthermore, a draft in the space between the air casing 13 and a combustion chamber 18 for a boiler is measured by a draft gage 17 provided in the air casing 13, and when a pressure difference preset occurs, the electrically operated valve 16 is automatically opened and superheated steam is ejected from the nozzle 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle cleaning device,
In particular, it relates to a cleaning device for an air jet in a soda recovery boiler.

[0002]

2. Description of the Related Art In recent years, automation of an air nozzle cleaning device for a soda recovery boiler has been attempted by rationalizing operation and maintenance in the industrial world. However, even if the smelt adhering to the periphery of the air nozzle is removed, there is a wide range from the molten smelt to the solidified smelt, and the solidified smelt is hard and the cleaning device does not move (hereinafter referred to as stick), while the molten smelt adheres to the cleaning device. However, there is a problem that it is necessary to solidify and clean the cleaning device itself.

Further, there has been a problem that the jet port for supplying air is temporarily blocked when the cleaning device is operated, and pulsation or the like occurs in the supplied air.

Further, the structure for removing the smelt adhering to the periphery of the air nozzle at one time requires adjustment of the clearance between the air nozzle and the cleaning device, or the clearance between the air nozzle and the cleaning device depending on the solidified state of the smelt. Problems such as sticking of solidified smelt and sticking occurred.

On the other hand, since a cleaning device for air jets is always installed in the wind box that constantly supplies combustion air to the boiler combustion chamber, various inspections from each air jet are required. Constraints were added.

Further, since an external drive mechanism is installed on the front surface of the wind box, various restrictions are imposed on maintenance and inspection of operators.

In addition, as described above,
When a trouble occurs, the maintenance work cannot be performed on the nozzle cleaning device until the boiler is stopped because the maintenance work is performed in the air box in which hot air constantly flows.

Therefore, it is necessary to manually clean the air nozzle while it is stopped. In this case, the stopped automatic cleaning device not only interferes with the manual cleaning, but also causes an air nozzle that cannot be cleaned. .. As a result, an imbalance occurs in the air supply, making it difficult to form char and control pollution control of NOx, SOx, etc., and in the worst case, the boiler must be stopped to require maintenance.

FIGS. 4 and 5 show a conventional manual nozzle cleaning device. In this conventional example, the handle 2 of the cleaning rod 1 is held by hand and operated back and forth to remove the smelt adhering to the periphery of the air nozzle, that is, the air nozzle 3.

FIGS. 6 and 7 show an automatic conventional nozzle cleaning device. In this conventional example, the rear end side of the cleaning rod 1 is connected to the drive cylinder 4, and the cleaning rod 1 is operated back and forth and up and down via the drive cylinder 4 to surround the air injection port 3. The smelt adhering to the is removed.

[0011]

However, in each of the above-mentioned conventional examples, the cleaning rod 1 is an internal type.
However, there was a problem in sticking and maintenance, sufficient function and performance were not guaranteed for long-term operation, and it was not always possible to save labor for the operator.

The present invention has been made in order to solve the problems of the prior art, and provides a nozzle cleaning device capable of automatically removing the smelt adhering to the periphery of the nozzle without the operator's inspection. The purpose is to provide.

[0013]

In order to solve the above-mentioned problems, the present invention provides a nozzle cleaning for preventing air nozzles such as soda recovery boilers and nozzles such as various measuring nozzles from being blocked by adherence of smelt. In the device, a steam ejection device having an electric valve is provided on the front surface of the injection port, and a wind box that supplies combustion air to the boiler combustion chamber is provided with a means for measuring the draft of the boiler combustion chamber and the wind box. Measure the pressure difference between the boiler combustion chamber and the wind box, and when the set pressure difference occurs, automatically open the motorized valve and inject superheated steam to remove the smelt adhering to the periphery of the injection port. It is composed.

[0014]

According to the above means, when the draft exceeds the set value, the electric valve is opened by sending the signal to the electric valve, and the steam is ejected from the injection port. With this steam jet output, the smelt adhering to the periphery of the nozzle is blown off, and when the draft falls below a set value, the motor-operated valve closes and steam jetting is stopped. By repeating such an operation, the growth of the smelt adhering to the periphery of the nozzle can be eliminated at all times.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a schematic configuration diagram showing a nozzle cleaning device according to this embodiment, FIG. 2 is a cross-sectional view of the air nozzle portion of FIG. 1, and FIG. 3 is a nozzle cleaning device arranged in the primary to tertiary air nozzles of a soda recovery boiler. It is a figure which shows the steam system of.

In these drawings, the primary to tertiary air nozzles of the soda recovery boiler, that is, the air injection port 11 (11A, 11A,
11B, 11C) is provided with a steam jet nozzle 12 for jetting steam on each front surface.
2 is a wind box 1 for supplying combustion air to the boiler combustion chamber 18.
It is configured to be housed in 3. The steam jetting nozzle 12 is provided at the tip of a branch pipe 15 branched from a steam line 14 of a steam suit blower (not shown), and an electric valve 16 is provided in the middle of the branch pipe 15.
Is provided.

The wind box 13 has a boiler combustion chamber 18
A draft meter 17 for measuring the draft between the wind box 13 and the wind box 13 is provided, and the draft meter 17 and the motor-operated valve 16 are electrically connected. This draft total 17
In FIG. 3, the state where only the tertiary air jet port 11C is provided is shown, but the primary to tertiary air jet ports 11A to 1C are shown.
1C, and the motor-operated valves 16 of the respective steam jet nozzles 12 can be simultaneously operated.

Next, the operation will be described. The draft meter 17 attached to the wind box 13 automatically measures the draft of the boiler combustion chamber 18 and the wind box 13, but the air injection port 1
1 (11A to 11C), when smelt adheres to the periphery of 1 (11A to 11C) and interrupts the supply of combustion air, the draft rises.

When the draft exceeds the set value, the signal is sent to the motor-operated valve 16 to open the motor-operated valve 16 and thereby the steam is ejected from the steam ejection nozzle 12 to the air injection port 11 (11A to 11C). ) Toward the side. With this steam jet output, the air jet 11 (11A-11
When the smelt adhering to the periphery of C) is blown off and the draft falls below the set value, the motor-operated valve 16 is closed and the steam ejection is stopped.

By repeating the above operation, it is possible to eliminate the growth of smelt adhering to the periphery of the air injection port 11 (11A to 11C) at all times, and it is possible to constantly supply a constant amount of combustion air to the boiler combustion chamber 18. During this operation, the operator can occasionally maintain proper operation by checking the TV monitor attached to each surface and checking for any abnormality.

Although the above-mentioned embodiment shows an example in which it is applied to the air injection port of a soda recovery boiler, the present invention is not limited to this, and is similarly applied to the air injection port of various boilers and various measurement injection ports. It is applicable.

[0022]

As described above, according to the present invention, a steam ejecting device having an electrically operated valve is provided in front of a nozzle such as an air nozzle of a soda recovery boiler or various measuring nozzles and a boiler combustion chamber is provided. A means for measuring the draft of the boiler combustion chamber and the wind box is provided in the wind box that supplies the combustion air, the differential pressure between the boiler combustion chamber and the wind box is measured, and when the set pressure difference occurs, By opening the motorized valve automatically and injecting superheated steam to remove the smelt adhering to the periphery of the nozzle, the combustion air can be automatically and continuously operated without operator's inspection. It is possible to supply a constant amount of the fuel gas, which can maintain the combustion state in the boiler combustion chamber at all times and easily maintain the pollution control value.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a nozzle cleaning device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an air injection port portion of FIG.

FIG. 3 is a diagram showing a steam system of a nozzle cleaning device arranged at primary to tertiary air nozzles of a soda recovery boiler.

FIG. 4 is a schematic configuration diagram showing an example of a conventional manual nozzle cleaning device.

5 is a cross-sectional view of the air injection port portion of FIG.

FIG. 6 is a schematic configuration diagram showing an example of a conventional automatic nozzle cleaning device.

FIG. 7 is a cross-sectional view of the air injection port portion of FIG.

[Explanation of symbols]

 11 (11A to 11C) Air jet 12 Steam jet nozzle 13 Wind box 14 Steam line 15 Branch pipe 16 Motorized valve 17 Draft meter 18 Boiler combustion chamber

Claims (1)

Claim: What is claimed is: 1. A nozzle cleaning device for preventing air nozzles such as soda recovery boilers and nozzles for various measurements from clogging due to adherence of smelt. An electric valve is provided in front of the nozzle. In addition to providing a steam ejecting device that has, a means for measuring the draft between the boiler combustion chamber and the wind box is provided in the wind box that supplies combustion air to the boiler combustion chamber, and the differential pressure between the boiler combustion chamber and the wind box is A nozzle cleaning device, which is configured to automatically open the motor-operated valve when a measured and set pressure difference is generated to inject superheated steam to remove smelt adhering to the periphery of the nozzle.