CN206817482U - A kind of steam sootblower positive seal device - Google Patents

Abstract

The utility model relates to a positive pressure sealing device for a steam soot blower, which comprises a wall box ash discharge port, an air pipe, a tee pipe, an air valve and an air supply device; the air supply device is connected to the entrance of the tee pipe through the air pipe ; The outlet of the tee pipe is respectively connected to the ash outlet of the wall box and the air valve through the air pipeline; the air supply device is one of the cold primary air main pipe of the power plant or the sealed air system formed by the fan and the pipeline; The utility model forms a positive pressure sealing system by introducing a wind that is 1.5 times greater than the combustion pressure of the furnace, which can prevent the flue gas in the furnace from leaking from the opening of the soot blower, and the sealing wind can always pass through the soot blower hole when the soot blower is inactive Enter the furnace to participate in the combustion, increase the amount of oxygen on the water-cooled wall of the boiler, reduce the high-temperature corrosion rate of the water-cooled wall, and at the same time, the access of the sealed protection wind can keep the barrel of the long-term telescopic sootblower dry for a long time to avoid corrosion and thinning of the barrel. Improve the surrounding environment of the soot blowing system and prolong the service life of the soot blower.

Description

A steam soot blower positive pressure sealing device

technical field

The utility model patent relates to a steam soot blower in power generation production, in particular to a sealing device when the steam soot blower is not in use.

Background technique

During the production and operation of the boiler, ash and slagging on the heating surface - water wall, superheater, economizer, preheater and flue, etc. have long plagued production and are difficult to solve. It not only weakens the heat transfer of the heating surface of the boiler, reduces the thermal efficiency of the boiler and reduces the production load, but also may lead to unexpected shutdown of the boiler when the ash and slagging on the heating surface are serious, resulting in major economic losses. Steam sootblower is an energy-saving equipment for boilers in thermal power plants and boilers in other industries.

When the traditional steam soot blower is running, due to mechanical and electrical reasons, the barrel of the soot blower is often stuck in the furnace, causing the machine to be stuck, and it cannot be pulled in and out. The failure rate is high, the service life is short, and the energy consumption is high. It is easy to cause a pipe explosion accident. Because it is a rotary seal under steam pressure, air leakage is very common and the surrounding environment is seriously polluted. The long telescopic steam soot blower system requires a lot of maintenance and high maintenance costs, which often leads to problems such as blown damage to the heating surface in the furnace. Despite the many disadvantages and problems of steam sootblowers, there is currently no better alternative to steam sootblowers. Due to the long barrel of the long telescopic steam soot blower, the barrel will be corroded and thinned in actual use, condensed water will accumulate in the soot blowing barrel, fly ash will leak from the wall box, and steam will leak from the packing during steam blowing Environmental pollution, poppet valve corrosion leakage and other issues.

Utility model content

In order to solve the above technical problems, provide a soot blower positive pressure sealing device that can avoid the leakage of smoke and dust at the wall box and keep the inside of the blower dry. The utility model provides the following technical solutions:

A positive pressure sealing device for a steam sootblower, comprising a wall box ash outlet, an air pipe, a three-way pipe, an air valve and an air supply device; the air supply device is connected to the inlet of the three-way pipe through an air pipe; the three The outlet of the through pipe is respectively connected to the ash outlet of the wall box and the air valve through the air pipe; the air supply device is one of the cold primary air main pipe of the power plant or a sealed air system formed by the fan and the pipe. The air supply device is used to introduce the air with a pressure 1.5 times or higher than the combustion pressure of the furnace, and enter the soot blower barrel from the ash discharge port of the wall box to form a sealed air system.

Further, a check valve is installed on the air pipeline to prevent the soot blower steam from flowing backward.

The beneficial effect of the utility model is that the source of the sealing wind is reliable and continuous, and the pressure meets the requirements, which can prevent the flue gas in the furnace from leaking from the opening of the soot blower, and the sealing wind can always pass through the soot blower when the soot blower is inactive. The holes enter the furnace to participate in combustion, increase the amount of oxygen on the water wall of the boiler, and reduce the high temperature corrosion rate of the water wall. At the same time, the access of the airtight protection wind can ensure that there is no smoke and dust leakage at the wall box, and the barrel of the long telescopic sootblower can be kept dry for a long time without condensed water, so as to avoid corrosion and thinning of the barrel and ensure that the soot blowing steam of the steam sootblower does not contain water , to ensure the safety of the heating surface and prolong the service life of the soot blower system equipment (poppet valve, air valve, inner and outer gun barrels, and gear box traveling mechanism).

Description of drawings

Fig. 1, the main structure schematic diagram of the utility model.

In the figure: 1. Ash discharge port of the wall box, 2. Air pipe, 21. Tee pipe, 3. Air valve, 4. Air supply device, 5. Check valve.

detailed description

A positive pressure sealing device for a steam sootblower as shown in Figure 1, comprising a wall box ash outlet 1, an air pipe 2, a tee pipe 21, an air valve 3 and an air supply device 4; the air supply device 4 passes through The air pipe 2 is connected to the inlet of the tee pipe 21; the outlet of the tee pipe 21 is respectively connected to the wall box ash outlet 1 and the air valve 3 through the air pipe 2; . The air supply device 4 is used to introduce the wind of 1.5 times or higher pressure of the furnace combustion pressure, and enter the soot blower barrel from the wall box ash discharge port 1 to form a sealed air system. There is a main valve in front of each sootblower for isolation, which is convenient for maintenance. A check valve 5 is installed on the air pipe 2 between the wall box ash discharge port 1 and the air valve 3 to prevent the sootblower steam from flowing backward.

The source of the sealing air is reliable, continuous, and the pressure meets the requirements, which can prevent the flue gas in the furnace from leaking from the opening of the soot blower. The sealing air can always enter the furnace through the soot blower hole to participate in combustion when the soot blower is inactive. Increase the amount of oxygen on the surface of the water-cooled wall to reduce the high-temperature corrosion rate of the water-cooled wall. At the same time, the access of the airtight protection wind can ensure that there is no smoke and dust leakage at the wall box, and the barrel of the long telescopic sootblower can be kept dry for a long time without condensed water, so as to avoid corrosion and thinning of the barrel, and ensure that the soot blowing steam of the steam sootblower does not contain water , to ensure the safety of the heating surface and prolong the service life of the soot blower system equipment (poppet valve, air valve, inner and outer gun barrels, and gear box traveling mechanism).

Inspired by the above-mentioned ideal embodiment of the utility model, and through the above description, relevant staff can make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

Claims (3)

1. A positive pressure sealing device for a steam soot blower, characterized in that: it comprises a wall box ash outlet, an air duct, a three-way pipe, an air valve and an air supply device; the air supply device is connected to the three-way pipe through an air duct The inlet; the outlet of the three-way pipe is respectively connected to the wall box ash outlet and the air valve through the air pipe. 2. A steam soot blower positive pressure sealing device as claimed in claim 1, characterized in that: said air supply device is one of the cold primary air main pipe of the power plant or the sealed air system formed by the fan and the pipe . 3. A positive pressure sealing device for a steam soot blower as claimed in claim 1, characterized in that a check valve is installed on the air pipe.