CN206786692U - A kind of pressure-maintaining nitrogen-charging anti-corrosion device for industrial boilers - Google Patents

Abstract

The utility model belongs to the technical field of boiler anti-corrosion equipment, in particular to a pressure-holding nitrogen-filling anti-corrosion device for an industrial boiler, which comprises a boiler body, a nitrogen main pipe, an isolation valve, a fixed-row main valve and an economizer inlet header drain valve, wherein the isolation valve and the fixed-row main valve are sequentially arranged on a pipeline connected with the boiler body, the pipeline between the isolation valve and the fixed-row main valve is connected with the nitrogen main pipe, and nitrogen in the nitrogen main pipe enters the boiler body and is discharged out of a room through the economizer inlet header drain valve, the utility model effectively utilizes the nitrogen pipeline in the area of a production company, can connect the original boiler pipe network with the nitrogen pipeline in the area without adding extra investment, has little investment, reduces the production cost, adopts a nitrogen-filling anti-corrosion method to protect the boiler, has long protection period and obvious effect, the operation process is simple, and the labor intensity of operators is low.

Description

A kind of pressure-maintaining nitrogen-charging anti-corrosion device for industrial boilers

technical field

The utility model belongs to the technical field of boiler anti-corrosion equipment, in particular to a pressure-holding nitrogen-charging anti-corrosion device for industrial boilers.

Background technique

Industrial boilers are widely used in power generation, chemical industry, light industry and other departments to generate electricity and produce steam. Ensuring the safe and economical operation of industrial boilers is of great significance to the development of the national economy and the protection of people's living needs. The requirements for the operation of industrial boilers are: firstly, to supply steam safely with quality and quantity, and secondly, to require boiler equipment to operate economically under safe conditions. There are many factors that affect the safe and economical operation of industrial boilers. On the one hand, it is caused by improper boiler design, manufacture, installation, and maintenance. A boiler, if the design is not good, and the manufacturing and installation quality is not good, of course it cannot achieve safe and economical operation. On the other hand, it is completely caused by operational reasons, such as not following the operating procedures when starting up, poor technical management of boilers, especially careless maintenance after shutdown, and the water in some boilers is not discharged cleanly. . After the boiler is out of service, a large amount of outside air will enter the boiler water system. Although the boiler has discharged water at this time, there is always a layer of water film attached to the metal surface of the boiler, and the oxygen in the air will dissolve in this water film, which is very It is easy to cause corrosion of dissolved oxygen, and the corrosion rate of the boiler is much faster than that during the operation of the boiler. If there is salt scale that can dissolve in the water film on the metal surface of the boiler, it will be more corrosive. Practice has proved that most of the boilers with severe corrosion are formed during the shutdown period and developed during operation. Therefore, it is of great significance to adopt appropriate protection methods during the shutdown period to prevent boiler corrosion, ensure safe operation, and prolong the service life of the boiler.

Utility model content

The purpose of the utility model is to provide an anti-corrosion device for protecting the left and right sides of the boiler by using the original boiler pipe network and filling the original boiler pipe network with nitrogen.

In order to achieve the above object, the utility model provides the following technical solutions:

An anticorrosion device for maintaining pressure and filling nitrogen for industrial boilers, including a boiler body, a nitrogen main pipe, an isolation valve, a fixed-discharge main valve, and a water discharge valve for an inlet header of an economizer. On the connected pipelines, the pipeline between the isolation valve and the fixed discharge main valve is connected with a nitrogen main pipe. The nitrogen in the nitrogen main pipe enters the boiler body and is discharged outside through the water discharge valve of the economizer inlet header.

Preferably, the boiler body includes a lower header connected to the fixed row main valve pipeline, the lower header is connected to the steam drum through the downcomer and the water wall tube respectively, and the upper header is also arranged on the water wall tube, and the steam drum is sequentially connected to the evaporation screen, The outlet header, the economizer, the inlet header of the economizer are connected with the drain valve of the inlet header of the economizer, and the inlet header of the economizer is also connected with the main valve of the water supply pipeline.

Compared with the prior art, the beneficial effects of the utility model are:

The utility model effectively utilizes the nitrogen pipeline in the area of the production company, and can connect the original boiler pipe network with the nitrogen pipeline in the area without adding additional investment. The utility model has less investment and reduces the production cost. The method of nitrogen anti-corrosion protects the boiler, and the protection period of the nitrogen-filled anti-corrosion protection boiler is long, the effect is obvious, the operation process is simple, and the labor intensity of the operators is small.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1. Nitrogen main pipe, 2. Isolation valve, 3. Fixed discharge master valve, 4. Lower header, 5. Downcomer, 6. Steam drum, 7. Evaporation screen, 8. Outlet header, 9. Province Coal appliance inlet header, 10. Main valve of water supply pipeline, 11. Economizer, 12. Water wall pipe, 13. Upper header, 14. Water discharge valve of economizer inlet header.

detailed description

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a pressure-holding and nitrogen-filled anti-corrosion device for industrial boilers includes a boiler body, a nitrogen main pipe 1, an isolation valve 2, a fixed discharge master valve 3, and an economizer inlet header water discharge valve 14, and an isolation valve 2 The fixed discharge main valve 3 is sequentially arranged on the pipeline connected to the boiler body, and the nitrogen main pipe 1 is connected to the pipeline between the isolation valve 2 and the fixed discharge main valve 3, and the nitrogen in the nitrogen main pipe 1 enters the boiler body After that, it is discharged to the outside through the water discharge valve 14 of the inlet header of the economizer. The boiler body includes the lower header 4 connected to the fixed discharge master valve 3 pipes. There is also an upper header 13 on the wall pipe 12, and the steam drum 6 is connected with the evaporation screen 7, the outlet header 8, the economizer 11, the economizer inlet header 9 and the economizer inlet header water discharge valve 14 in sequence, The inlet header 9 of the economizer is also connected with the main valve 10 of the water supply pipeline.

When the utility model is used in practice, the boiler furnace water must be drained, the isolation valve 2 and the main valve 10 of the water supply pipeline are closed, the water discharge valve 14 of the inlet header of the economizer is opened, the fixed discharge main valve 3 is opened, and the nitrogen main pipe 1 is opened Nitrogen enters the steam drum 6 through the fixed row main valve 3 through the lower header 4, the downcomer 5, the water wall pipe 12 and the upper header 13, and the nitrogen enters the evaporation screen 7 after being collected in the steam drum 6, and then enters the province through the pipeline. In the outlet header 8 of the coal appliance, the economizer 11, and the inlet header 9 of the economizer, a portable oxygen content meter is used to measure the oxygen content at the outlet valve 14 of the inlet header of the economizer. After testing, the oxygen content is less than When it is 19.5%, it can be considered that the boiler pipes, headers, etc. are nitrogen-filled and anti-corrosion qualified, and the nitrogen can be directly discharged through the water discharge valve 14 of the inlet header of the economizer.

Claims (2)

1. a kind of Industrial Boiler is with holding pressure nitrogen charging anti-corrosive apparatus, including boiler body, nitrogen main pipe（1）, isolating valve（2）, fixed row Main valve（3）With economizer influent header Draw off valve（14）, it is characterised in that described isolating valve（2）With determine row's main valve（3）According to It is secondary to be located on the pipeline being connected with boiler body, positioned at isolating valve（2）With determine row's main valve（3）Between pipeline on be connected with nitrogen Gas main pipe（1）, nitrogen main pipe（1）Interior nitrogen enters after boiler body by economizer influent header Draw off valve（14）Discharge It is outdoor.

2. a kind of Industrial Boiler as claimed in claim 1 presses nitrogen charging anti-corrosive apparatus with holding, it is characterised in that described boiler sheet Body is included with determining row's main valve（3）The lower collecting box of pipeline connection（4）, described lower collecting box（4）Pass through down-comer respectively（5）, water cooling Wall pipe（12）With drum（6）Connection, water screen tube（12）On be additionally provided with upper header（13）, the drum（6）Shield successively with evaporation （7）, outlet header（8）, economizer（11）, economizer influent header（9）With economizer influent header Draw off valve（14）Connection, Economizer influent header（9）Also with feedwater piping total valve（10）Connection.