CN216844636U - Corrosion monitoring and rust-proof protection device for waste heat boiler during shutdown - Google Patents

Abstract

A corrosion monitoring and corrosion prevention protection device for a waste heat boiler during a shutdown period comprises an air environment detection system device, a corrosion simulation test system device and a vacuum pumping system; the air environment detection system device comprises an air environment detection chamber; the parallel air exhaust connecting pipes are communicated with the air environment detection chamber; the corrosion simulation test system device comprises a corrosion test chamber communicated with the upper part of the air environment detection chamber; suspending corrosion hanging sheets in the corrosion test chamber; the upper part of the corrosion test chamber is communicated with a corrosion test chamber exhaust pipe; the vacuum pumping system device comprises an exhaust pipe of an air exhaust fan, which is communicated with the bottom of the air environment detection chamber; the power supply and the system controller are connected with the electric control equipment; the air environment detection system device can be used for monitoring the temperature, humidity and pressure of air in the thermal equipment during the stop (standby) period of the waste heat boiler, monitoring the corrosion condition of metal materials, enhancing the corrosion protection effectiveness by a vacuumizing method and having the characteristics of more effectiveness and accuracy.

Description

Corrosion monitoring and anti-corrosion protection device during shutdown of waste heat boiler

technical field

The utility model relates to a corrosion protection device for thermal equipment used for shutdown (standby) of a power plant, in particular to a corrosion monitoring and anti-corrosion protection device during the shutdown of a waste heat boiler.

Background technique

At present, the commonly used deactivation protection method for thermal power generating units is "ammonia water ammoniation, hot furnace water discharge, waste heat drying". Dry the heating surface of the boiler to protect the boiler. However, the problem with this method is that due to the different operation of the water discharge pressure and temperature in each power plant, it is impossible to completely drain the accumulated water in the thermal equipment, especially the bottom of the superheater, which leads to corrosion during shutdown. Therefore, the ammonia alkalization drying method usually cannot achieve the ideal anti-corrosion protection effect, and even because of the poor water quality, serious oxygen corrosion, pitting corrosion, etc., it is easy to cause a pipe burst accident after starting the machine, which seriously endangers the safe and stable operation of the equipment.

DL/T 956 "Guidelines for Anti-corrosion of Thermal Equipment for Shutdown (Standby) of Thermal Power Plants" stipulates that "the relative humidity of the air is less than 60%" in the drying method of hot furnace discharge water and waste heat. The position of the steam valve and the water discharge valve is tested on-site with a hygrometer, which cannot characterize the actual internal humidity of the power plant equipment, and for areas with high humidity in the south, natural ventilation cannot meet the requirement that the humidity is less than 60%. In addition, the standard does not describe a method for quantitative monitoring of out-of-service corrosion.

Therefore, in order to more effectively and accurately monitor the temperature, humidity, and corrosion of metal materials in the furnace during the shutdown (standby) period of the unit, and to strengthen the effectiveness of corrosion protection by vacuuming, the utility model provides a waste heat boiler out of service. Periodic corrosion monitoring and anti-corrosion protection devices.

SUMMARY OF THE INVENTION

In view of the problems existing in the prior art, the purpose of this utility model is to provide a corrosion monitoring and anti-corrosion protection device during the shutdown of the waste heat boiler, which is used to monitor the internal air temperature, humidity, humidity and temperature of the thermal equipment during the shutdown (standby) of the waste heat boiler. The corrosion of metal materials is monitored, and the effectiveness of corrosion protection is enhanced by vacuuming, which is more effective and accurate.

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

A corrosion monitoring and anti-corrosion protection device during the deactivation of the waste heat boiler, comprising an air environment detection system device, a corrosion simulation test system device and a vacuum pumping system fixed in the equipment cabinet 15;

The air environment detection system device includes an air environment detection chamber 5; the parallel air extraction connection pipe A1 and the air extraction connection pipe B3 are connected to the air environment detection chamber through the corresponding air extraction inlet valve A2 and air extraction inlet valve B4 respectively. 5 connected;

The corrosion simulation test system device includes a corrosion test chamber 13 connected to the upper part of the air environment detection chamber 5, and a corrosion test chamber inlet valve 6 is arranged on the connected pipeline; a corrosion coupon 14 is suspended in the corrosion test chamber 13; the corrosion test The upper side of the chamber 13 is connected to the corrosion test chamber exhaust pipe 7;

The described vacuuming system device includes an exhausting fan exhaust pipe 11 which is communicated with the bottom of the air environment detection chamber 5, and the connected pipeline is sequentially provided with an exhausting fan inlet valve 18, an exhausting fan 17 and an exhausting fan exhaust. valve 16.

The exhaust pipe 7 of the corrosion test chamber is provided with a micro air pump 9 and an air outlet valve 8 of the corrosion test chamber.

The instrument, the air extraction fan 17 and the micro air extraction pump 9 in the air environment detection chamber 5 are connected to the power supply and the system controller 10 through the power supply and the communication line 12 respectively.

The air environment detection chamber 5 is equipped with a temperature sensor, a humidity sensor and a gas pressure sensor.

The power supply and system controller 10 is provided with a temperature, humidity and pressure display panel of the air environment detection chamber 5 , an air extraction fan 17 , a status display panel and control buttons of the micro air pump 9 .

Compared with the prior art, the utility model has the following beneficial technical effects:

The utility model provides a set of devices for accurately monitoring the temperature, humidity and corrosion of metal materials in the furnace during the shutdown of the unit, which solves the problem of humidity errors in the current process of monitoring the humidity during shutdown of the furnace. It is relatively large and cannot guide the work of shutdown protection. The device can accurately obtain the air temperature, pressure and humidity parameters in the furnace, and monitor the corrosion situation through the corrosion coupon, which provides a scientific basis for the implementation of the shutdown protection plan. In addition, the device can accelerate the evaporation of water vapor, reduce the humidity, and reduce the oxygen content in the furnace by means of vacuuming, thereby reducing the risk of oxygen corrosion and enhancing the effectiveness of corrosion protection.

Description of drawings

FIG. 1 is a schematic structural diagram of the device in the embodiment of the present invention.

Detailed ways

The present utility model will be further described in detail below with reference to specific embodiments, which are to explain rather than limit the present utility model.

Referring to FIG. 1 , a corrosion monitoring and anti-corrosion protection device during the shutdown of the waste heat boiler includes an air environment detection system device, a corrosion simulation test system device and a vacuum pumping system fixed in the equipment cabinet 15 .

The air environment detection system device includes an air environment detection chamber 5; the parallel air extraction connection pipe A1 and the air extraction connection pipe B3 are connected to the air environment detection chamber 5 through the corresponding air extraction inlet valve A2 and air extraction inlet valve B4 respectively. Connected; the gas enters the air environment detection chamber 5 through the suction inlet valve A2 through the suction connection pipe A1, and the parallel suction connection pipe B3 enters the air environment detection chamber 5 through the suction inlet valve B4; the suction connection pipe A1, the suction inlet The valve A2 and the air environment detection chamber 5 are connected by pipelines in the form of welding or threads; the suction connecting pipe B3, the suction inlet valve B4, and the air environment detection chamber 5 are connected by welding or threads through the pipelines.

The corrosion simulation test system device includes a corrosion test chamber 13 connected to the upper part of the air environment detection chamber 5, and a corrosion test chamber inlet valve 6 is provided on the connected pipeline; a corrosion coupon 14 is suspended in the corrosion test chamber 13; The environmental testing chamber 5 enters the corrosion testing chamber 13 through the inlet valve 6 of the corrosion testing chamber; the upper side surface of the corrosion testing chamber 13 is connected to the corrosion testing chamber exhaust pipe 7 through a pipeline in the form of welding or threads; the corrosion testing chamber exhaust pipe 7 is provided with Micro air pump 9 and corrosion test chamber outlet valve 8, the exhaust gas is discharged through micro air pump 9, corrosion test chamber air outlet valve 8 and corrosion test chamber exhaust pipe 7 in sequence.

The described vacuuming system device includes an exhausting fan exhaust pipe 11 which is communicated with the bottom of the air environment detection chamber 5, and the connected pipeline is sequentially provided with an exhausting fan inlet valve 18, an exhausting fan 17 and an exhausting fan exhaust. Valve 16; Mounting is welded or threaded.

The air environment detection chamber 5 is equipped with a temperature sensor, a humidity sensor and a gas pressure sensor.

The instrument, the air extraction fan 17 and the micro air extraction pump 9 in the air environment detection chamber 5 are connected to the power supply and the system controller 10 through the power supply and the communication line 12 respectively.

The power supply and system controller 10 is provided with a temperature, humidity and pressure display panel of the air environment detection chamber 5, an air extraction fan 17, a micro air pump 9 status display panel and control buttons.

The working principle of the utility model is:

The utility model is connected with the exhaust pipe opening behind the exhaust air valve of the superheater and reheater, and the air extraction connection pipe A1 enters the air environment detection chamber 5 through the air extraction inlet valve A2, and the parallel air extraction connection pipe B3 passes through the air extraction connection pipe The air inlet valve B4 enters the air environment detection chamber 5 ; each sensor in the air environment detection chamber 5 displays the temperature, humidity and pressure information in the power supply and system controller 10 .

The gas enters the corrosion test chamber 13 from the air environment detection chamber 5 through the corrosion test chamber inlet valve 6; the air environment in the corrosion test chamber 13 is consistent with the air environment parameters in the superheater or reheater pipe connected to the exhaust connection pipe. The corrosion simulation test of the test piece is carried out in the environment, and the corrosion condition of the corrosion coupon 14 is monitored; finally, the exhaust gas is discharged through the micro air pump 9, the outlet valve 8 of the corrosion test chamber, and the exhaust pipe 7 of the corrosion test chamber.

The vacuuming system device evacuates the air environment detection chamber 5 through the exhaust fan 17, and through the vacuuming method, accelerates the evaporation of water vapor, reduces the humidity, reduces the oxygen content in the furnace, and reduces the risk of oxygen corrosion.

Claims (5)

1. Corrosion monitoring and anti-corrosion protection device during a waste heat boiler deactivation, it is characterized in that, comprise the air environment detection system device, the corrosion simulation test system device and the vacuuming system that are fixed in the equipment cabinet (15); The air environment detection system device comprises an air environment detection chamber (5); the parallel air extraction connection pipe A (1) and the air extraction connection pipe B (3) pass through the corresponding air extraction inlet valves A (2) and B (3) respectively. The suction inlet valve B (4) is communicated with the air environment detection chamber (5); The corrosion simulation test system device comprises a corrosion test chamber (13) communicated with the upper part of the air environment detection chamber (5), and a corrosion test chamber inlet valve (6) is arranged on the connected pipeline; Hang the corrosion coupon (14); the upper side of the corrosion test chamber (13) is connected to the corrosion test chamber exhaust pipe (7); The vacuuming system device comprises an air-extraction fan exhaust pipe (11) communicated with the bottom of the air environment detection chamber (5), and an air-extraction fan intake valve (18) and an air-extraction fan ( 17) and the exhaust fan exhaust valve (16). 2. The device for monitoring corrosion and anti-corrosion protection during the outage of a waste heat boiler according to claim 1, is characterized in that, the exhaust pipe (7) of the described corrosion test chamber is provided with a micro air pump (9) and Corrosion test chamber outlet valve (8). 3. The corrosion monitoring and anti-corrosion protection device according to claim 1, characterized in that a temperature sensor, a humidity sensor and a gas pressure sensor are installed in the air environment detection chamber (5). . 4. The corrosion monitoring and anti-corrosion protection device according to any one of claims 1-3, wherein the instrument, the exhaust fan (17) in the air environment detection room (5) ) and the micro air pump (9) are respectively connected with the power supply and the system controller (10) through the power supply and the communication line (12). 5. The device for monitoring corrosion and anti-corrosion protection during a waste heat boiler out of use according to claim 4, characterized in that, in the power supply and the system controller (10), an air environment detection room (5) is provided. The temperature, humidity and pressure display panel is provided with an air extraction fan (17), a micro air extraction pump (9) status display panel and control buttons.

Images