CN107790275A - Flue gas recirculation pipe with cool-down dehumidification function - Google Patents

Abstract

The invention discloses a flue gas circulation pipe with the function of cooling and dehumidifying, which comprises a first pipe section, a second pipe section and a third pipe section sequentially connected along the flue gas conveying direction; the upper part of the first pipe section is externally connected with a cold air input pipe; the first The middle and lower part of the pipe section is equipped with an equalizing device; the first pipe section is equipped with a Lafal pipe structure; the bottom of the second pipe section is provided with a sewage outlet, and the sewage outlet is opened and closed by an automatic drain valve located inside the second pipe section; The upper part of the third pipe section is provided with a demister and a humidity detector; the electric control valve is linked with the humidity detector. The flue gas circulation pipe of the present invention can actively introduce cold air to accelerate the condensation of water vapor in the flue gas, and install a demister and humidity detector at the rear end to ensure that most of the condensed water in the flue gas circulation pipe is collected Discharge, so as to avoid condensate corrosion pipes, endangering the operation of the milling system.

Description

Flue gas circulation pipe with cooling and dehumidification function

technical field

The invention relates to a flue gas circulation pipe with the function of cooling and dehumidifying.

Background technique

The pulverizing system is to input raw coal into the mill to make coal powder with a certain particle size, and the mill must input hot air to dry the coal powder while grinding coal. The hot air generally comes from the hot blast stove, and its circulation system is that the air is sent to the hot blast stove by the fan to heat and burn, and the flue gas generated is sent to the mill to dry the coal powder, and then sent to the circulation pipe through the induced draft fan and enters the furnace outlet. The mixed air column is mixed with the high-temperature flue gas produced by the new combustion to cool down to the temperature required by the process, and then enters the mill to dry the pulverized coal and repeat this process.

The temperature of the flue gas after the outlet of the induced draft fan of the hot blast stove is low. During the process of backflow circulation, the water vapor in the flue gas will gradually condense and precipitate water and corrode the circulation pipe, which will eventually affect the normal operation of the entire pulverizing system. However, the existing flue gas circulation pipeline is not equipped with corresponding protection measures, and there is a great potential safety hazard.

Contents of the invention

The object of the present invention is to provide a flue gas circulation pipe with the function of cooling and dehumidifying, which can actively introduce cold air to accelerate the condensation of water vapor in the flue gas, and install a demister and a humidity detector at the rear end to ensure that the flue gas Most of the condensed water in the circulation pipe is collected and discharged, so as to prevent the condensed water from corroding the pipe and endangering the operation of the milling system.

In order to achieve the above object, the technical solution of the present invention is to design a flue gas circulation pipe with the function of cooling and dehumidification, including the first pipe section, the second pipe section and the third pipe section connected in sequence along the flue gas conveying direction; the first pipe section and The third pipe section is placed vertically, and the second pipe section is placed horizontally; the bottom ends of the first pipe section and the third pipe section are respectively connected to the two ends of the second pipe section; the first pipe section and the third pipe section are stainless steel pipes, and the second pipe section is glass steel pipe;

The upper part of the first pipe section is externally connected with a cold air input pipe, and an air dryer and an electric regulating valve are arranged on the cold air input pipe; the middle and lower parts of the first pipe section are provided with an air equalizer; structure, the Rafal tube structure is located at the junction of the cold air input tube and the first tube section;

The bottom of the second pipe section is provided with a sewage outlet, and the sewage outlet is opened and closed by an automatic drain valve arranged inside the second pipe section;

The upper part of the third pipe section is provided with a demister and a humidity detector, and the humidity detector is located above the demister;

The electric regulating valve is linked with the humidity detector, if the humidity detected by the humidity detector becomes larger, the electric regulating valve is opened; if the humidity detected by the humidity detector becomes smaller, the electric regulating valve is turned down.

Preferably, the inner walls of the first pipe section and the third pipe section are covered with a hydrophobic anti-corrosion coating.

Preferably, the inner wall of the second pipe section is covered with a hydrophobic coating.

The advantages and beneficial effects of the present invention are: to provide a flue gas circulation pipe with the function of cooling and dehumidifying, which can actively introduce cold air, accelerate the condensation of water vapor in the flue gas, and set a demister and a humidity detector at the rear end , to ensure that most of the condensed water in the flue gas circulation pipe is collected and discharged, so as to prevent the condensed water from corroding the pipe and endangering the operation of the milling system.

The flue gas enters the first pipe section first, and the first pipe section is externally connected to the cold air input pipe. The dry cold air can be sucked in by the Rafal tube structure, and the flue gas is rapidly cooled and condensed into water, and the condensed water is collected in the second pipe section. ;The second pipe section is equipped with an automatic drain valve, which automatically drains water when the liquid level reaches a certain height; the third pipe section is equipped with a demister and a humidity detector to ensure that the humidity of the circulating flue gas is at a low point and will not leak in the subsequent pipeline. Condensate the water again.

The electric regulating valve of the present invention is linked with the humidity detector. If the humidity detected by the humidity detector becomes larger, the electric regulating valve is opened; if the humidity detected by the humidity detector becomes smaller, the electric regulating valve is turned down.

The first pipe section and the third pipe section are stainless steel pipes, which are convenient for connection with the front and rear pipes. The inner walls of the first pipe section and the third pipe section are covered with a hydrophobic anti-corrosion coating, which can improve the corrosion resistance of the first pipe section and the third pipe section, and increase the service life of the first pipe section and the third pipe section.

Since the condensed water is collected into the second pipe section, the second pipe section of the present invention is made of glass steel pipe, which can avoid being corroded by condensed water. The inner wall of the second pipe section is covered with a hydrophobic coating, which can greatly reduce the accumulation of dirt and facilitate the cleaning of the second pipe section.

The present invention also has following characteristics:

1. The device has a simple structure and can realize automatic control without manual intervention.

2. The humidity of the circulation pipeline can be monitored and adjusted in real time.

3. The Lafal tube structure is adopted to absorb dry air naturally, no power device is required, the dehumidification effect is good, and the corrosion of condensed water in the pipeline is effectively prevented.

Detailed ways

The specific implementation of the present invention will be further described below in conjunction with the examples. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

The technical scheme of concrete implementation of the present invention is:

A flue gas circulation pipe with the function of cooling and dehumidifying, comprising: a first pipe section, a second pipe section and a third pipe section connected in sequence along the flue gas conveying direction; the first pipe section and the third pipe section are vertically arranged, and the second pipe section is placed horizontally; The bottom ends of the first pipe section and the third pipe section are respectively connected to the two ends of the second pipe section;

The first pipe section and the third pipe section are stainless steel pipes, and the second pipe section is glass steel pipe;

The inner walls of the first pipe section and the third pipe section are covered with a hydrophobic anti-corrosion coating;

The inner wall of the second pipe section is covered with a hydrophobic coating;

The upper part of the first pipe section is externally connected with a cold air input pipe, and an air dryer and an electric regulating valve are arranged on the cold air input pipe; the middle and lower parts of the first pipe section are provided with an air equalizer; structure, the Lafal tube structure is located at the junction of the cold air input pipe and the first pipe section;

The bottom of the second pipe section is provided with a sewage outlet, and the sewage outlet is opened and closed by an automatic drain valve arranged inside the second pipe section;

The upper part of the third pipe section is provided with a demister and a humidity detector, and the humidity detector is located above the demister;

The electric regulating valve is linked with the humidity detector, if the humidity detected by the humidity detector becomes larger, the electric regulating valve is opened; if the humidity detected by the humidity detector becomes smaller, the electric regulating valve is turned down.

The flue gas circulation pipe of the present invention can actively introduce cold air to accelerate the condensation of water vapor in the flue gas, and install a demister and humidity detector at the rear end to ensure that most of the condensed water in the flue gas circulation pipe is collected Discharge, so as to avoid condensate corrosion pipes, endangering the operation of the milling system.

The flue gas enters the first pipe section first, and the first pipe section is externally connected to the cold air input pipe. The dry cold air can be sucked in by the Rafal tube structure, and the flue gas is rapidly cooled and condensed into water, and the condensed water is collected in the second pipe section. ;The second pipe section is equipped with an automatic drain valve, which automatically drains water when the liquid level reaches a certain height; the third pipe section is equipped with a demister and a humidity detector to ensure that the humidity of the circulating flue gas is at a low point and will not leak in the subsequent pipeline. Condensate the water again.

The electric regulating valve of the present invention is linked with the humidity detector. If the humidity detected by the humidity detector becomes larger, the electric regulating valve is opened; if the humidity detected by the humidity detector becomes smaller, the electric regulating valve is turned down.

The first pipe section and the third pipe section are stainless steel pipes, which are convenient for connection with the front and rear pipes. The inner walls of the first pipe section and the third pipe section are covered with a hydrophobic anti-corrosion coating, which can improve the corrosion resistance of the first pipe section and the third pipe section, and increase the service life of the first pipe section and the third pipe section.

Since the condensed water is collected into the second pipe section, the second pipe section of the present invention is made of glass steel pipe, which can avoid being corroded by condensed water. The inner wall of the second pipe section is covered with a hydrophobic coating, which can greatly reduce the accumulation of dirt and facilitate the cleaning of the second pipe section.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (3)

1. The flue gas circulation pipe with the function of cooling and dehumidification is characterized in that it includes: the first pipe section, the second pipe section and the third pipe section connected in sequence along the flue gas conveying direction; The pipe sections are laid flat; the bottom ends of the first pipe section and the third pipe section are respectively connected to the two ends of the second pipe section; the first pipe section and the third pipe section are stainless steel pipes, and the second pipe section is glass steel pipe; The upper part of the first pipe section is externally connected with a cold air input pipe, and an air dryer and an electric regulating valve are arranged on the cold air input pipe; the middle and lower parts of the first pipe section are provided with an air equalizer; structure, the Rafal tube structure is located at the junction of the cold air input tube and the first tube section; The bottom of the second pipe section is provided with a sewage outlet, and the sewage outlet is opened and closed by an automatic drain valve arranged inside the second pipe section; The upper part of the third pipe section is provided with a demister and a humidity detector, and the humidity detector is located above the demister; The electric regulating valve is linked with the humidity detector, if the humidity detected by the humidity detector becomes larger, the electric regulating valve is opened; if the humidity detected by the humidity detector becomes smaller, the electric regulating valve is turned down. 2. The flue gas circulation pipe with cooling and dehumidification function according to claim 1, characterized in that, the inner walls of the first pipe section and the third pipe section are covered with a hydrophobic anti-corrosion coating. 3. The flue gas circulation pipe with cooling and dehumidification functions according to claim 2, characterized in that the inner wall of the second pipe section is covered with a hydrophobic coating.