JPS61500628A - soot blower - Google Patents

Abstract

The soot blower comprises a tube (1) provided with nozzles (2) and leading to a heat exchanger through an opening provided in a wall which is made tight by a box (7). The tube (1) and the box (7) are supplied with sweeping air and with retaining air which are produced, for each soot blower, by a compressor (16).

Description

[Detailed description of the invention] soot blower The present invention provides heating of a heat exchanger constructed according to the generic concept of claim 1. This invention relates to a soot blower for cleaning surfaces.

In this type of sootblower, a solid, liquid or gaseous fuel is burned. The combustion gas generated in the heat exchanger is passed through a nozzle by a blowing device. Since it communicates with the lance pipe, there is a risk of it flowing into the lance pipe. be. For this reason, corrosion caused by combustion gases, which are corrosive and hot gases, is often or the lance pipe is damaged due to contamination.

To overcome this drawback, non-hazardous gaseous cleaning media, e.g. It is introduced above the equipment valve, and its pressure is higher than the pressure on the combustion gas side in the heat exchanger. It is set slightly higher. By setting the pressure in this way, the soot blows A non-hazardous cleaning gas flows through the equipment's lance pipe towards the heat exchanger. , thereby preventing corrosive combustion gases from entering the nozzle. need around the inlet of the lance pipe protruding into the heat exchanger for sealing purposes. A barrier medium, e.g. a wall box where air surrounds the inlet area. be blown inside.

Heat exchangers, especially in power plant boilers where a large number of soot blowers are installed. When the soot blower is It is distributed to various locations. In this case, an expensive conduit system is required. It is. The blower pressure levels used in traditional soot blowers are very low; In order to keep friction loss low, it is necessary to set the cross-sectional area of the pipe relatively large. This is often the case. In addition, it is extended to each soot blower. Although the friction loss varies due to the unequal length of the pipes, , in front of each soot blower in order to distribute the required amount of air as evenly as possible. It is necessary to provide a special adjustment mechanism. Also, the thermal expansion and thermal expansion of the heat exchanger Due to the misalignment movement of the soot blower caused by The connection to the control box must be of flexible design.

Another disadvantage of central air systems is that they usually fail when the heat exchanger does not function. Air is often drawn through a conventional blower that is made to stop rolling. It is to be. As a result, the heat remains in the heat exchanger at a relatively high temperature for a relatively long time. Due to the existing chimney effect, undesirable combustion occurs within the lance pipe of the soot blower. Gases may enter or combustion gases may be released outward through the heat exchanger wall openings. may be done.

Other requirements raised by many manufacturers and users of heat exchangers include: The amount of air introduced into each soot blower is kept as low as possible, and combustion This is to prevent the amount of introduced air from exceeding the maximum value even when pressure fluctuations occur on the gas side. That is.

It is therefore an object of the invention to provide a soot blower with a cleaning medium and a blocking medium. The objective is to simplify the previously known systems.

In order to achieve the above object, the features described in the first claim A soot blowing device is proposed according to the invention, characterized in that it has the following features: For advantageous embodiments, see patent claims 2 to 11. I want to be.

According to the invention, central blowers and expensive air distribution systems can be eliminated. You can do it. This is because each soot blower has its own compressor. This is because it supplies northern air and cutoff air.

The compressor and soot blower distribution pipes ensure that each soot blower always has cleaning air. Designed to ensure the required amount of shutoff air. perfunctory tone Sections are to be carried out under the manufacturer.

The following is a detailed description of the invention with reference to the accompanying drawings, which illustrate embodiments of the invention. Ru.

1 is a side view of the soot blower according to the present invention, and FIG. 2 is a detailed view of the Y section in FIG. 1. A detailed drawing, FIG. 3, shows two parts of a soot blower constructed in accordance with another embodiment of the invention. Detail view.

A long tube screw-on soot blower is shown in the accompanying drawings.

Note that the present invention is applicable to other types of soot blowing devices as well, except for the details described below. Can be applied.

The illustrated soot blower is equipped with a lance pipe 1, in front of which A nozzle 2 is attached to the end. Lance pipe 1 is operated by motor 3 The mobile wagon 4 is connected to a mobile wagon 4 which is equipped with a lance pipe 1. It is also possible to run on fixed support rails 5. Mo In addition to moving lance pipe l, motor 3 also rotates lance pipe l. Therefore, the nozzle 2 moves in a spiral pattern. Lance· The end point of the moving path of pipe l is set by a fixed limit switch. .

The lance pipe 1 can enter the heat exchanger through the inlet opening. heat exchange The wall of the exchanger is shown by wall vibro. The entrance opening is It is surrounded by a wall box 7 to prevent air leakage. Lance· Even when pipe 1 is retracted, lance pipe 1 and nozzle 2 are attached to the wall box. It remains in the box.

A movable lance pipe 1 surrounds a fixed inner tube 8 and has a rear end thereof. is connected to a fitting for supplying a blowing medium, e.g. steam. blowout medium The amount of body can be regulated by a valve 9 provided on the soot blower. It has become so.

The inner tube 8 is provided with a fitting 10 through which a cleaning medium, for example air, can pass. cleaning air joint The hand 10 is placed on the valve seat of the soot blower valve 9, i.e. on the flow direction of the blowing medium. It is arranged behind the soot blower valve 9 when viewed from the side.

Cleaning air is supplied to the lance pipe 1 through the cleaning air joint 10 and the inner pipe 8, and the nozzle It flows out from Le 2. In the cleaning air joint 11 that extends to the cleaning air joint 10, A stop valve 12 is arranged so that after opening the pulp 9, the blowing medium is washed A check valve 12 is designed to prevent it from entering the tracheal passage 11.

The wall box 7 is provided with a fitting 13 for passing a blocking medium, for example air. Ru. The shutoff air fitting 13 extends onto the soot blower via a flexible conduit 14. It is connected to a cut-off air line 15 provided therein. The pressure of the cleaning air and the shutoff air is heat exchanged. The pressure is set higher than the gas pressure inside the exchanger.

Cleaning air and shutoff air are supplied from equipment suitable for soot blowing equipment, as shown. In the embodiment, this device is operated by a compressor 16 assembled into a soot blower. It is configured. The compressor 16 is connected to a soot blower at the factory to provide one assembled as a unit.

The drive device that drives the compressor 16 and the motor 3 of the moving part of the soot blower The electrical connection cable is extended to the central terminal box and Safety measures have been taken to prevent electrical accidents from occurring within the Terminal Bossufu. It is.

As shown in FIGS. 1 and 2, the compressor 16 is connected to a soot blower valve. It is placed near the block 9.

An air line 17 is connected to the outlet of the compressor 16, and the air line 17 is connected to the outlet of the compressor 16. It extends to the T-shaped joint.

a shut-off air line 15 extending to a shut-off air fitting 13 of the wall box 7; A cleaning air joint 11 extending to a cleaning air joint 10 branches from a T-shaped joint 18. are doing. A safety valve 19 is provided in the middle of the air pipe line 17. The operating pressure is set in accordance with the discharge pressure of the compressor 16. complex 7 sir 16 also has a supply capacity independent of the level of back pressure on the combustion gas side. A piston-type compressor, preferably designed to Compressors that operate according to the principle of pushing, such as piston-type compressors, can be used. 0.99 to 1.02 bar regardless of back pressure Able to operate in pressure ranges relevant to soot blowers and with low procurement costs Sideway compressors are significantly inferior to the types of compressors mentioned above. It is particularly advantageous to use Designing a compressor like this Therefore, even if the back pressure on the combustion gas side is lower than the set pressure of the compressor 16, the In such cases, the supply capacity does not increase or increases only slightly. When using a compressor, the operating point is highly dependent on the back pressure of the compressor. It has clear advantages compared to previously known central niematic systems. Ru.

Another characteristic of the compressors listed above compared to radial blowers is their relatively high height. Because it can operate against pressure, it overcomes the large frictional resistance within the soot blower. It's about being able to win. Therefore, it is necessary to The long tube shown has a nozzle 2 held stationary in a wall box 7. When using a type of soot blower such as a spiral soot blower, the soot blower It is possible to use the air introduced into the equipment as cleaning air, and It is also possible to use it as a blocking air. Soot blowing device configured like this If you use a soot blower, the air flowing out from nozzle 2 will be In addition to preventing leakage from the heat exchanger wall, It also works to Therefore, this configuration is caused by the displacement movement of the heat exchanger wall. This is advantageous because the flexible conduit 14 required for be. However, in this configuration, the overpressure on the combustion gas side is low, and the soot blower is activated. This option can only be selected if there is no need to supply cutoff air while That is, while the soot blower is operating, the check valve 12 is closed and the compressor is closed. Either turn on the electricity to the lesser sensor 16 or blow out the air through the safety valve 19. Make sure to do the following. However, if the overpressure is relatively high, an independent washing A closed air joint 10 and a shutoff air joint 13 must be prepared.

In the embodiment shown in FIG. 3, the compressor 16 is connected directly to the wall box. It is attached to box 7.

In this embodiment, the shutoff air joint 13 is connected and fixed to the wall box 7. Ru. In this embodiment as well, the air blown into the wall box 7 is blocked. It can be used as cleaning air as well as air, so there is no combustion or Burning gas does not escape from the heat exchanger into the atmosphere and is stored inside the soot blower. There is no risk of inflow.

If shutoff air and wash air must be supplied separately, the A T-shaped joint 18 having a branch part communicating with the cleaning air pipe line 15 is connected to the air pipe so that When the soot blower that must be installed in the middle of road 17 is not in operation, That is, when the soot blower valve 9 is closed, the nozzle 2 of the blowing pipe is heated. In the case of a type of soot blower that protrudes into the exchanger, it is also necessary to isolate it from the cleaning air. It is necessary to supply air separately. This gas is always present in the gas flow. Regarding the type of multi-nozzle soot blower, the actual model shown in Figures 2 and 3 is used. You must choose the method of supplying cleaning air or blocking air according to Mr. Shi Li. Must be.

The soot blower is used with the soot blower valve 9 open and the check valve 12 closed. The compressor 16 is operated continuously while the compressor 16 is being used. 16 controls are performed. In the event that overpressure occurs, the overpressure will be released through the safety valve 19. Served. For soot blowers operated using only cleaning air, the soot blower When operating the compressor 16, the compressor 16 is controlled to be energized. In this case, the electrical drive of the compressor 16 is preferably The on-off pulse is controlled by the soot blower limit switch. detected by the protection system of the device controller.

International roofing report ANNEX τOT2i INτERNAT 0NAL SEλRCHREPC RT　NINTERNATIONAL　APPfJCATION　No, P CT/E:' 84700390 (S included 8532) FR-A-113298 5None DE-B-1176785None CB-A-382109None CB-A-362450' None DE-C-543593Non@

Claims (11)

[Claims] (1) The soot blower is equipped with a lance pipe (1), and the soot blower is provided with a lance pipe (1); 1) extends through the wall of the heat exchanger and around the penetration part. Wall. The box (7) is used to seal the lance pipe ( 1) is provided with a nozzle (2) at its front end, and its rear end is equipped with a soot blower valve. It is connected to the supply part of the blowing medium through the pipe (9), and the lance pipe (1) is equipped with a cleaning medium coupling (10) or a wall box (7) It is equipped with a shut-off medium coupling (13), which connects the soot blower valve (9) and the cleaning medium coupling. Sweeping the heated surface of the heat exchanger configured to provide a check valve (12) between the hands (10) In the soot blowing device for cleaning, the soot blowing device supplies a cleaning medium and a blocking medium, A soot blowing device characterized by being equipped with a dedicated device for dispersing soot. (2) A patent characterized in that the dedicated device comprises a compressor (16) A soot blower according to claim 1. (3) The compressor (16) is configured as a bypass compressor. The soot blower according to claim 2, characterized in that: (4) Compressor (16) and joints (10, 13) for cleaning medium and blocking medium. ), and the safety valve (19) is provided between the compressor and the compressor. -(16) The scope of the patent claim is characterized in that the pressure is adjusted according to the set pressure of (16). The soot blowing device according to any one of items 1 to 3. (5) The compressor (16) is assembled into a soot blower and the soot blower The patent claim is characterized in that the device cooperates with the device to form one independent unit. The soot blowing device according to any one of the first to fourth claims. (6) The compressor (16) is located near the soot blower valve (9). 6. The soot blowing device according to claim 5, wherein the soot blowing device is characterized in that: (7) Directing the cleaning medium and the shutoff medium exclusively over the valve seat of the soot blower valve (9) The soot blower according to claim 6, characterized in that the soot blower is equipment. (8) Compressor (16) is placed near wall box 7 The soot blowing device according to claim 5, characterized in that: (9) Introducing blocking and cleaning media exclusively around the wall box (7) The soot blower according to claim 8, characterized in that the soot blower is Device. (10) Electrical connection cable connecting the soot blower and compressor (16) A patent characterized in that the cable extends to the center terminal box. A soot blowing device according to any one of claims 1 to 9. (11) While the soot blower is in use, the compressor (16) is turned off. On and off pulses of the limit switch of the soot blower According to claim 1, the compressor (16) is controlled. The soot blowing device according to any one of Items 10 to 10 above.