What should I do if the economizer is damaged?

It depends;

Economizer damage is too much to maintain the drum water level, at this time after the furnace is stopped in order to maintain the drum water level as much as possible, the recirculation door should also be closed, the economizer leakage is not serious, the drum water level can still be maintained, still to the furnace negative pressure can also be maintained, at this time you can maintain the operation, wait for the furnace to stop the order, at this time the door is carried out according to normal operation, the door is closed, open after the furnace is stopped, but to adhere to the water level, depending on the degree of leakage, you can open for a period of time, after the furnace temperature drops to a certain extent, close it early.

When the boiler is shut down, the main valve is closed and there is no evaporation, but the waste heat of the boiler still exists, and the recirculation door of the economizer is opened to make the water in the economizer flow and prevent the economizer from overheating and damage. And normal operation.

If the boiler is still running, then it is still turned off;

If the boiler is stopped, it is still open to prevent the rest of the tubes from overheating, and the lower part of the flue should be drained.

About us. Shandong Xiuneng Pipeline Engineering ****, with a registered capital of 3 million yuan, is mainly engaged in pipeline engineering, hydraulic engineering design, construction, maintenance, pressure plugging, pressure hole plugging, pipeline equipment maintenance and technology development, transfer, consulting services, mechanical equipment processing, sales, instrumentation, hardware, power, security products, plugging sealant, monitoring equipment sales and maintenance and other aspects of technical services, engineering construction, the company after years of development, has formed a technology research and development and training, Engineering construction and service as one of the enterprise action system.

The company pays attention to the research and development and innovation of new technologies, and has scientific and technological research and development personnel and technicians as the technical support and guarantee of the enterprise. It has developed a number of technical achievements, with unique technology, to meet the needs of customers, with a strong construction technology and good quality of the engineering team, can better adapt to the needs of the market.

The company adheres to the principle of "quality first, customer first", and regards meeting the needs of customers as the responsibility of the enterprise, whether it is product quality, construction quality, and service awareness, it has been well received by the majority of customers.

Standardized management mechanism, perfect engineering service system, and innovative technology research and development concepts are the key to the company's success. Winning trust with excellent service, creating brilliance with strength, and growing with customers are the company's development philosophy and purpose.

The purpose of installing economizer recirculation doors is to protect economizers when the boiler is ignited and stopped, and when the feed water is interrupted. Because when the fire is raised and the furnace is stopped, when the water is not available, the water in the economizer does not flow, and the high-temperature flue gas may burn out the economizer tube.

Open the economizer in the circulation door, and use the difference between the specific gravity of the steam drum and the economizer working fluid to produce natural circulation, so that the economizer tube can be cooled.

The economizer recirculation system is rarely used, and only when the furnace temperature of the boiler is very high and the boiler cannot be filled with water, in order to prevent the economizer from burning out, the economizer recirculation is opened.

Be sure to close the recirculation door when the water is normally filled, otherwise the economizer will be damaged.

Another example: in the process of boiler ignition, the economizer can be opened after the indirect water supply is over, but if the water level drops, the recirculation door must be closed if the water is needed (it is clearly stipulated in the boiler safety code).

If the economizer recirculation door leaks during normal operation, it will make part of the feed water enter the steam drum directly through the short circuit of the recirculation pipe and not flow through the economizer, this part of the water is not heated in the economizer, and the water temperature is low, which is easy to cause the temperature difference between the upper and lower walls of the steam drum to increase and produce thermal stress and affect the life of the steam drum.

In addition, the feed water passing through the economizer is reduced, and the flow rate is reduced without adequate cooling. Therefore, in normal operation, the recirculation door should be closed tightly.

Economizer (English name economizer) is the heating surface of the boiler feed water heated into saturated water under drum pressure in the flue at the tail of the boiler, because it absorbs the heat of low-temperature flue gas, reduces the exhaust gas temperature of the flue gas, saves energy and improves efficiency, so it is called economizer.

In the early stage of ignition or after the boiler is stopped, it is often necessary to stop the water intake, and the water of the economizer also stops flowing, but at this time, the economizer is still in a heated state, and the economizer cannot be cooled, and it may be damaged by overheating. In addition, it may also cause the water in the economizer to boil, vaporize or even hot steam, so that when water is fed into the boiler, the phenomenon of water shock will occur.

In order to protect the safety of the economizer, a recirculation pipe and recirculation door are installed between the population of the economizer and the steam drum. When the boiler intermittently enters the water, the recirculation door is opened, so that the water in the steam drum flows into the economizer through recirculation and then flows back to the steam drum through the economizer, forming a 33

The recirculation of economizer refers to the installation of recirculation pipe at the bottom of the steam drum and the inlet pipe of economizer, and its working principle is: in the initial stage of boiler ignition or in the process of stopping the furnace, when the water supply is stopped because of the inability to continuously enter the water, the water in the economizer tube basically does not flow, and the pipe wall is not well cooled and is easy to burn out at overtemperature. If a recirculation pipe is installed between the steam drum and the economizer, when the water supply is stopped, the recirculation door can be opened, and the water in the economizer rises into the steam drum due to the small heating density, and the water in the steam drum can be continuously replenished into the economizer through the recirculation pipe, thus forming a natural circulation.

The boiler often stops entering water at the beginning of ignition or after the furnace is stopped, and the water in the economizer stops flowing, but at this time the economizer is still in a heated state, and the economizer may burn out if it is not cooled. At the same time, it may also cause the water in the economizer to boil, vaporize or even produce superheated steam, so that when water is fed into the boiler, there will be no water shock. In order to protect the safety of the economizer, a recirculation pipe is installed between the inlet of the economizer and the steam drum.

When the boiler stops flowing water, the water from the steam drum is recirculated to the economizer, and then flows back to the steam drum through the economizer, forming a natural circulation loop to cool the economizer.

If the economizer recirculation door is not tightly closed, the water that has not been heated by the economizer is much more than the saturated water in the steam drum, if it directly enters the steam drum, even if it is a small amount of water leakage, it will also make the metal of the steam drum wall around the recirculation pipe and the steam drum weld joint crack due to uneven cold and heat.

For steam boilers with steam drums, in order to protect the economizer, the economizer is installed and then followed, which is very simple, that is, in special circumstances; If the boiler starts, pressurizes the fire, or some accidents, the boiler stops watering, but at this time the boiler still has a certain amount of hot flue gas in the discharge through the economizer, so that the economizer is heated, and a part of the water will be gasified, but the steam generated in the economizer is not allowed, in order to avoid this situation, the economizer is installed for recirculation, which is just a pipeline that leads from the bottom of the drum water side to the header under the economizer feed water inlet, and a valve is generally installed on the recirculation pipe near the economizer inlet. In this way, the valve is opened when necessary, so that the hot water in the economizer floats after heating, and the water at the relative temperature of the lower part of the steam drum flows down through the recirculation pipe to supplement the water floating on the economizer, so as to protect the economizer.

between the steam drum and the economizer import link; The connecting pipe is called the recirculation pipe, and the section door installed on it is called the recirculation door.

In the process of starting or stopping the boiler, because the boiler does not need to be fed water or does not need to be continuously fed, the water in the economizer.

In the non-flowing state, the cooling effect of the economizer is very poor, although the flue gas temperature is not very high at this time, the temperature of the pipe wall of the economizer may be high, and the water in the pipe may be vaporized. In order to prevent the occurrence of this situation, the recirculation door can be opened at this time, and the density difference between the steam drum and the working fluid in the economizer is used to form a natural circulation between the steam drum recirculation pipe, the economizer, the economizer and the steam drum, so that the water in the economizer can flow, improve the cooling effect of the economizer, and achieve the purpose of protecting the economizer.

In the process of starting or stopping the boiler, it is sometimes necessary to intermittently add water to promote the flow of water in the economizer for better protection.

Economizer. However, the recirculation door must be closed when the water is filled, and the recirculation door must be opened after the water is filled. If you forget to close the recirculation door when the water is loaded, it is equivalent to that the feed water can enter the steam drum at the same time through the two parallel channels of the recirculation pipe and the economizer, because the flow resistance of the economizer is much greater than that of the recirculation pipe, and the amount of water passing through the economizer will be very small, which will not achieve the purpose of protecting the economizer.

When the boiler is transferred from the start-up process to normal operation, if you forget to close the recirculation door, the harm will be even greater. In addition to the small amount of water passing through the economizer, the economizer may be burned out, but also because the low-temperature feed water directly enters the steam drum through the recirculation pipe, which will reduce the temperature of the boiler water in the local area, disturb the separation of steam and water, and affect the steam quality; And because the temperature difference at the nozzle of the drum recirculation is large, a large temperature difference stress is generated there. If the recirculation door is not closed for a long time, it may cause circumferential cracks in the steam drum.

In summary, remember to close the economizer recirculation door when the boiler is intermittently watered, or when the boiler is transferred from the start-up process to normal operation.