CN113237824A - Boiler steam-water system corrosion simulation experiment device and experiment method thereof - Google Patents
Boiler steam-water system corrosion simulation experiment device and experiment method thereof Download PDFInfo
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- CN113237824A CN113237824A CN202110630065.4A CN202110630065A CN113237824A CN 113237824 A CN113237824 A CN 113237824A CN 202110630065 A CN202110630065 A CN 202110630065A CN 113237824 A CN113237824 A CN 113237824A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N2001/1031—Sampling from special places
- G01N2001/105—Sampling from special places from high-pressure reactors or lines
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Abstract
The invention discloses a boiler steam-water system corrosion simulation experiment device and an experiment method thereof, and the boiler steam-water system corrosion simulation experiment device comprises a heating furnace, a reaction kettle, a cooling pipe, a kettle cover and a sample hanging frame, wherein the reaction kettle is arranged in the heating furnace, the cooling pipe is arranged in the reaction kettle, the cooling pipe cools the reaction kettle through cooling water circulation of an external water tank, and a rotatable sample hanging frame device is arranged on the kettle cover of the reaction kettle. The invention can realize the metal corrosion experiment in the steam-water environment with higher temperature and pressure, the cooling pipe in the kettle can realize accelerated cooling, the material suction pipe can realize quick and simple sampling, and the invention can be used for simulating the metal corrosion of systems such as a boiler water supply system, a superheater, a reheater and the like.
Description
Technical Field
The invention relates to the technical field of boiler experimental equipment, in particular to a boiler steam-water system corrosion simulation experimental device and an experimental method thereof.
Background
The metal in the boiler steam-water system contacts with water and steam with higher temperature, chemical and electrochemical reactions can occur to damage the metal, so that metal corrosion is caused, which is a common phenomenon in the boiler steam-water system, accidents such as failure of a heating surface are easily caused, and great influence is generated on the operation of the whole boiler system. Different parts of the boiler are different in temperature, pressure and medium environment, so that the corrosion rule and the corrosion mechanism of different parts are different. When the boiler is not provided with an oxygen removal system or is not completely oxygen-removed, the oxygen content in water is higher, and the oxygen and metal form a primary battery to generate electrochemical reaction and a series of chemical reactions, so that the metal is corroded, and the water supply pipeline and the inlet of the economizer are easily corroded by dissolved oxygen; because the boiler feed water contains free carbon dioxide and the carbonate in the water is decomposed to generate gases such as carbon dioxide and the like, the gases form carbonic acid after being dissolved in the water, the pH value of the water is obviously reduced, so that the metal is subjected to acid corrosion, and a boiler water supply system and a condensate system are easy to be subjected to carbon dioxide corrosion due to the high concentration of the carbon dioxide; while the superheated steam with the temperature higher than 450 ℃ can react with metal chemically to generate metal oxide, so that metal corrosion is caused, and the general superheater and reheater are easy to generate steam corrosion.
However, adopt rotatory lacing film to corrode experimental apparatus among the conventional art and be used for simulating the corruption of metal among the boiler circulating water system usually, the device includes the base and fixes the constant temperature water tank on the base, places a plurality of experiment beakers in the constant temperature water tank, is equipped with the rotatable sample stores pylon that corresponds experiment beaker on constant temperature water tank upside, can dismantle the connection lacing film on the stirring rake dead lever to carry out lacing film corrosion experiment. The rotary coupon corrosion experiment device can only simulate the metal corrosion experiment under normal pressure, and the temperature is usually lower than 100 ℃, so that the metal corrosion experiment of a boiler water supply system under normal pressure can only be simulated through the corrosion coupon experiment, the metal corrosion simulation experiment of systems such as a boiler condensate system, a superheater and a reheater can not be realized, and therefore, in order to research the corrosion condition of different parts of metal materials of a boiler under high temperature and high pressure, the corrosion simulation experiment device for the boiler steam-water system is needed.
Disclosure of Invention
The invention aims to solve the defect that the existing simulation experiment of metal corrosion in high-temperature and high-pressure steam-water environments of systems such as a boiler water supply system, a superheater and a reheater cannot be realized, and provides a corrosion simulation experiment device and an experiment method for a boiler steam-water system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the device comprises a heating furnace, a reaction kettle, a cooling pipe, a kettle cover and a sample hanging frame, wherein the reaction kettle is arranged in the heating furnace, the cooling pipe is arranged in the reaction kettle, the cooling pipe cools the reaction kettle through cooling water circulation of an external water tank, and a rotatable sample hanging frame device is arranged on the kettle cover of the reaction kettle.
Further, rotatable sample stores pylon includes motor, belt and sample stores pylon, the output of motor passes through the belt pulley with the pivot of sample stores pylon is connected, the sample stores pylon sets up perpendicularly in the reation kettle.
Further, the sample hanger is multi-layered.
Further, a gas phase valve is arranged at the outlet end of the reaction kettle, a high-pressure gas cylinder is externally connected with the gas phase valve of the reaction kettle, and gas is introduced into the reaction kettle through a gas inlet pipe.
Further, the exit end of reation kettle is provided with safe subassembly.
Furthermore, a temperature measuring tube is arranged in the reaction kettle and used for measuring the reaction temperature in the kettle.
A corrosion simulation experiment method for a boiler steam-water system comprises the following steps:
a, adding an experimental medium into a reaction kettle, placing a metal sample on a sample hanging rack, and placing the metal sample in the reaction kettle;
b, enabling the sample to be respectively positioned at the corresponding liquid phase, gas-liquid interface and gas phase position of the sample hanging rack;
c, covering the reaction kettle with a kettle cover to enable the reaction kettle to be well sealed, introducing nitrogen into the reaction kettle through an air inlet pipe, heating the reaction kettle to an experimental temperature through a heating furnace, and starting an experiment after the temperature and the pressure are stable;
and D, driving the sample hanging rack to slowly rotate through the rotating shaft, reacting for 72 hours at constant temperature and pressure, closing the heating furnace, cooling, and taking out the sample to collect corrosion data after the temperature is reduced to room temperature.
Further, the experimental medium is deionized water.
Further, in the experiment of simulating the metal corrosion of the boiler condensed water system, the sample is placed in the gas phase in the kettle, the medium in the reaction kettle is heated into water vapor, after 72 hours of reaction, a cooling pipe in the reaction kettle is opened to cool to 80 ℃, so that condensed water is formed on the surface of the metal sample, the reaction is continued for 72 hours, and the sample is taken out.
The method for evaluating the corrosion inhibition performance of the boiler water treatment agent comprises the steps of adding an experimental medium and the water treatment agent into a reaction kettle, hanging a metal sample on a sample hanging frame, placing the metal sample in the reaction kettle, covering a reaction kettle cover, introducing nitrogen into the reaction kettle through an air inlet pipe, heating the metal sample to an experimental temperature through a heating furnace, reacting for 72 hours at constant temperature and pressure, naturally cooling the metal sample, taking out the sample, and evaluating the corrosion inhibition effect of the boiler water treatment agent by comparing the corrosion conditions of the sample under the condition of the existence of the water treatment agent;
furthermore, the medium in the reaction kettle is taken out through the material suction pipe after the experiment, and the high-temperature stability of the boiler water treatment agent is analyzed through the change of the medium components before and after the experiment.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize metal corrosion experiments in high-temperature and high-pressure steam-water environments, the cooling pipe in the kettle can realize accelerated cooling, the material suction pipe can realize quick and simple sampling, and the device can be used for simulating metal corrosion of systems such as a boiler water supply system, a superheater, a reheater and condensed water, and simultaneously can be used for evaluating the corrosion inhibition effect and high-temperature stability of a boiler water treatment medicament.
Drawings
FIG. 1 is a schematic structural diagram of a boiler steam-water system corrosion simulation experiment device according to the present invention in a front view;
in the figure: 1-heating furnace, 2-reaction kettle, 3-cooling pipe, 4-temperature measuring pipe, 5-safety component, 6-motor, 7-rotating shaft, 8-belt pulley, 9-belt, 10-gas phase valve, 11-liquid phase valve, 12-hanging rack, 13-material suction pipe, a-blasting valve port, b1/b 2-cooling water inlet and outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, the test tube type reactor comprises a heating furnace, a reaction kettle, a cooling tube, a kettle cover and a sample hanging frame, wherein the reaction kettle is arranged in the heating furnace, the cooling tube is arranged in the reaction kettle, the cooling tube cools the reaction kettle through cooling water circulation of an external water tank, and a rotatable sample hanging frame device is arranged on the kettle cover of the reaction kettle.
In this embodiment rotatable sample stores pylon includes motor, belt and sample stores pylon, the output of motor passes through the belt pulley with the pivot of sample stores pylon is connected, the sample stores pylon sets up perpendicularly in the reation kettle.
In this embodiment, the sample rack is multi-layered and is used for collecting data of different phases in the reaction kettle.
In this embodiment, the heating furnace is an electric heating furnace, which facilitates rapid heating.
In this embodiment reation kettle's exit end is provided with the gas phase valve, and the gas phase valve of peripheral hardware high-pressure gas cylinder and reation kettle is connected, lets in gas in to reation kettle through the intake pipe, can get rid of the dissolved oxygen in the experimental medium, can pressurize to different pressure in the reation kettle simultaneously for simulate different corrosive environment.
In this embodiment the exit end of reation kettle is provided with safe subassembly, can quick pressure release when reation kettle pressure is too high.
In this embodiment, a temperature measuring tube is disposed in the reaction kettle to measure the reaction temperature in the kettle, and one or more temperature measuring tubes may be disposed.
A corrosion simulation experiment method for a boiler steam-water system comprises the following steps:
a, adding an experimental medium into a reaction kettle, placing a metal sample to be detected on a sample hanging rack, and placing the metal sample into the reaction kettle;
b, enabling the sample to be respectively positioned at the liquid phase position, the gas-liquid interface position and the gas phase position corresponding to the sample hanging rack;
c, covering the reaction kettle with a kettle cover to enable the reaction kettle to be well sealed, introducing nitrogen into the reaction kettle through an air inlet pipe, heating the reaction kettle to an experimental temperature through a heating furnace, and starting an experiment after the temperature and the pressure are stable;
and D, driving the sample hanging rack to slowly rotate through the rotating shaft, reacting for 72 hours at constant temperature and pressure, closing the heating furnace, cooling, and taking out the sample to perform metal corrosion data acquisition and corrosion inhibition evaluation on the boiler water treatment agent after the temperature is reduced to room temperature.
The corrosion simulation experiment device for the steam-water system of the boiler comprises a reaction kettle, a cooling pipe, a kettle cover, a sample hanging frame and a high-pressure gas cylinder. The electric heating furnace is used for heating the temperature in the reaction kettle to an experimental temperature, a temperature measuring tube is arranged in the reaction kettle, and the temperature in the reaction kettle is monitored in real time; the cooling pipe mainly comprises a cooling pipe and an external water tank in the reaction kettle, and the cooling in the reaction kettle is realized through the circulation of cooling water of the external water tank; the sample hanging rack is divided into three layers, is connected with the kettle cover through a rotating shaft and is arranged in the reaction kettle, and the metal sample can be hung on different layers of the sample hanging rack to be positioned at different height positions in the reaction kettle; the high-pressure gas cylinder is connected with a gas phase valve of the reaction kettle, and gas is introduced into the reaction kettle through a gas inlet pipe.
The experimental medium in this example was deionized water.
In this embodiment, in a metal corrosion experiment of a boiler condensate system, a medium in a reaction kettle is heated to a water vapor form, after a reaction for 72 hours, a cooling pipe in the reaction kettle is opened to cool to 80 ℃ so as to form condensate on the surface of a metal sample, the reaction is continued for 72 hours, and the sample is taken out.
The method for evaluating the corrosion inhibition performance of the boiler water treatment agent in the embodiment comprises the steps of adding an experimental medium and the water treatment agent into a reaction kettle, hanging a metal sample on a sample hanging frame, placing the metal sample in the reaction kettle, covering a reaction kettle cover, introducing nitrogen into the reaction kettle through an air inlet pipe, heating the metal sample to an experimental temperature through a heating furnace, reacting for 72 hours under constant temperature and pressure, naturally cooling the metal sample, taking out the sample, and evaluating the corrosion inhibition effect of the boiler water treatment agent through the corrosion condition of the sample;
in this embodiment, the medium in the reaction kettle is taken out through the material suction pipe before and after the reaction, and the high-temperature stability of the boiler water treatment agent is analyzed through the change of the medium components before and after the experiment.
The boiler steam-water system corrosion experiment method comprises the following steps: adding an experimental medium (pure water) into the reaction kettle, hanging a metal sample on a sample hanging rack, placing the metal sample in the reaction kettle, enabling the sample to be respectively in liquid, a gas-liquid interface and a gas phase, covering a reaction kettle cover, introducing nitrogen into the reaction kettle through a gas inlet pipe, controlling the pressure in the kettle to be 400kPa, and then heating the metal sample to an experimental temperature through a heating furnace; and driving the sample hanging rack to slowly rotate through the rotating shaft, reacting for 72 hours at constant temperature and pressure, closing the heating furnace, cooling, and taking out the sample after cooling to room temperature. In addition, in the metal corrosion experiment of the boiler condensed water system, the pressure and the temperature in the reaction kettle are adjusted to certain values to enable the medium in the reaction kettle to be in a water vapor form, after 72 hours of reaction, a cooling pipe in the reaction kettle is opened to cool to 80 ℃, so that condensed water is formed on the surface of a metal sample, the reaction is continued for 72 hours, and the sample is taken out.
The evaluation experiment method of the boiler water treatment agent comprises the following steps: adding an experimental medium (pure water) and a water treatment agent with a certain concentration into a reaction kettle, hanging a metal sample on a sample hanging frame, placing the metal sample in the reaction kettle, covering a reaction kettle cover, introducing nitrogen into the reaction kettle through an air inlet pipe, controlling the pressure in the kettle to be 101-400kPa, and then heating the metal sample to an experimental temperature through a heating furnace; after reacting for 72 hours under constant temperature and pressure, naturally cooling, taking out the sample, and evaluating the corrosion inhibition effect of the boiler water treatment agent according to the corrosion condition of the sample; in addition, the medium in the reaction kettle is taken out through the material suction pipe, and the high-temperature stability of the boiler water treatment agent is analyzed through the change of the medium components before and after the experiment.
The simulation experiment device disclosed by the invention has the highest bearing pressure of 20MPa and the highest service temperature of 550 ℃, can realize corrosion simulation experiments on different parts of a boiler steam-water system, and is provided with the cooling pipe in the reaction kettle, so that the corrosion of the boiler condensed water system can be simulated, and therefore, the experiment device is beneficial to researching the behavior, rule and mechanism of metal corrosion of the whole boiler steam-water system; the cooling pipes in the reaction kettle can accelerate the cooling speed, save the cooling time and improve the experimental efficiency; the material suction pipe in the reaction kettle enables sampling to be convenient in the experimental process or after the experiment is finished, and the operation is simple. In addition, the experimental device can be used for evaluating the corrosion inhibition effect and the stability of the boiler water treatment agent under high temperature and high pressure.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a boiler steam-water system corrodes simulation experiment device, includes the heating furnace, its characterized in that still includes reation kettle, cooling tube, kettle cover and sample stores pylon, be provided with reation kettle in the heating furnace, be provided with the cooling tube in the reation kettle, the cooling tube realizes the cooling to in the reation kettle through the cooling water circulation of external water tank, but be provided with the rotary sample stores pylon on reation kettle's the kettle cover.
2. The boiler steam-water system corrosion simulation experiment device according to claim 1, wherein the rotatable sample hanging rack comprises a motor, a belt and a sample hanging rack, an output end of the motor is connected with a rotating shaft of the sample hanging rack through the belt pulley, and the sample hanging rack is vertically arranged in the reaction kettle.
3. The corrosion simulation experiment device for the steam-water system of the boiler according to claim 2, wherein the sample hanging rack is multi-layer.
4. The sample hanging rack according to claim 1, wherein a gas phase valve is arranged at the outlet end of the reaction kettle, a high-pressure gas cylinder is connected with the gas phase valve of the reaction kettle, and gas is introduced into the reaction kettle through a gas inlet pipe.
5. The boiler steam-water system corrosion simulation experiment device according to claim 1, wherein a safety component is arranged at the outlet end of the reaction kettle.
6. The boiler steam-water system corrosion simulation experiment device according to claim 1, wherein a temperature measuring pipe is arranged in the reaction kettle to measure the reaction temperature in the kettle.
7. A corrosion simulation experiment method for a boiler steam-water system comprises the following steps:
a, adding an experimental medium into a reaction kettle, placing a metal sample on a sample hanging rack, and placing the metal sample in the reaction kettle;
b, enabling the sample to be respectively positioned at the corresponding liquid phase, gas-liquid interface and gas phase position of the sample hanging rack;
c, covering the reaction kettle with a kettle cover to enable the reaction kettle to be well sealed, introducing nitrogen into the reaction kettle through an air inlet pipe, heating the reaction kettle to an experimental temperature through a heating furnace, and starting an experiment after the temperature and the pressure are stable;
and D, driving the sample hanging rack to slowly rotate through the rotating shaft, reacting for 72 hours at constant temperature and pressure, closing the heating furnace, cooling, and taking out the sample to collect corrosion data after the temperature is reduced to room temperature.
8. The corrosion simulation experiment device for the boiler steam-water system according to claim 7, wherein in the metal corrosion experiment of the boiler condensate water system, the sample is placed in the gas phase in the kettle, the medium in the reaction kettle is heated into water vapor, after the reaction for 72 hours, the cooling pipe in the reaction kettle is opened to cool the sample to 80 ℃, so that condensate water is formed on the surface of the metal sample, the reaction is continued for 72 hours, and the sample is taken out.
9. The boiler steam-water system corrosion simulation experiment device as claimed in claim 7, wherein the method for evaluating corrosion inhibition performance of the boiler water treatment agent comprises the steps of adding an experiment medium and the water treatment agent into a reaction kettle, hanging a metal sample on a sample hanging frame, placing the sample in the reaction kettle, covering a reaction kettle cover, introducing nitrogen into the reaction kettle through an air inlet pipe, heating the reaction kettle to an experiment temperature through a heating furnace, reacting for 72 hours under constant temperature and pressure, naturally cooling, taking out the sample, and evaluating corrosion inhibition effect of the boiler water treatment agent by comparing corrosion conditions of the sample under the condition of existence of the water treatment agent.
10. The boiler steam-water system corrosion simulation experiment device according to claim 7, wherein the medium in the reaction kettle is taken out through the material suction pipe after the experiment, and the high-temperature stability of the boiler water treatment agent is analyzed through the change of the medium components before and after the experiment.
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| CN202110630065.4A CN113237824A (en) | 2021-06-07 | 2021-06-07 | Boiler steam-water system corrosion simulation experiment device and experiment method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441428A (en) * | 2022-01-14 | 2022-05-06 | 常州大学 | Metal material hydrogen sulfide corrosion experiment device |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441428A (en) * | 2022-01-14 | 2022-05-06 | 常州大学 | Metal material hydrogen sulfide corrosion experiment device |
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