JPS6344667Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a connection structure between a chimney and a wet desulfurization device.

Conventionally, boilers that use heavy oil as fuel usually use C heavy oil with a sulfur content of about 3%. Therefore, the exhaust gas from the boiler contains a large amount of SOx, so it is purified using a wet desulfurization equipment, but the SOx content in the exhaust gas that passes through this desulfurization equipment is about 1000ppm. Since it contains supersaturated water, a drain containing sulfuric acid is generated on the inner wall of the chimney cylinder. This drain water is acidic and corrodes the chimney cylinder. Therefore, in order to protect the chimney cylinder, the supersaturated moisture-containing exhaust gas that had passed through a wet desulfurization device was heated to over 150°C using an afterburner to dry it before being exhausted from the chimney. However, the fuel required for this afterburner is 5 to 6% of the boiler fuel, consuming a large amount of fuel. Therefore, in recent years, the inner wall of the cylinder of an existing chimney is lined with stainless steel plate or FRP to make it corrosion resistant, or in the case of a new chimney, the cylinder itself is made of metal with corrosion resistance such as stainless steel plate. Therefore, the use of afterburners is being discontinued and the method is being replaced by a method in which the moist exhaust gas is passed through the chimney as it is and the moisture in the exhaust gas is collected on the inner wall of the chimney. However, in this method, the exhaust gas containing supersaturated moisture that has passed through the wet desulfurization device is simply passed through the chimney cylinder, and the moisture in the exhaust gas that comes into contact with it is removed by the walls of the chimney cylinder. Therefore, the moisture separation efficiency in the exhaust gas is poor, and the moisture is not completely removed before it is exhausted into the atmosphere. It is not desirable from the viewpoint of pollution prevention that even a portion of the gas is not completely removed and is emitted into the atmosphere.

A method and device for preventing water droplets from scattering from a chimney disclosed in Japanese Patent Application Laid-Open No. 54-73335 includes providing an exhaust gas swirling blade in the chimney and carving a slit higher than the top of the chimney on the leeward side of the blade. It is equipped with a straight pipe type water droplet collecting member, and since the rotating blades are locally installed inside the middle part of the chimney, the discharge angle and discharge speed can be adjusted according to the type and amount of exhaust gas. It cannot be controlled and the moisture contained in the exhaust gas cannot be efficiently collected in the chimney.

Therefore, this idea uses a plurality of movable deflection plates installed in the exhaust pipe just before the exhaust gas generated in the boiler, passed through a wet desulfurization device, and led to the exhaust pipe is introduced into the chimney's chimney. The deflection angle of the deflection plate 7 is determined according to the moisture content of the exhaust gas, the type of fuel burned in the boiler, and the amount of exhaust gas. The above-mentioned drawbacks are solved by appropriately adjusting each of them individually or together to efficiently collect the moisture contained in the exhaust gas on the inner wall of the cylinder of the chimney.

Hereinafter, embodiments of this invention will be described based on the drawings. 1 to 3 show one embodiment of this invention. In the diagram, 1 is a boiler, 2
3 is a wet desulfurization device, 3 is a chimney, and 4 is an exhaust pipe that communicates the wet desulfurization device 2 and the chimney 3. Chimney 3
The exhaust pipe 4 is made by running a stainless steel plate or FRP on the inner wall of a cylinder made of reinforced concrete or iron plate to provide corrosion resistance, or by using a metal material with corrosion resistance such as a stainless steel plate. The bottom of the chimney cylinder near the flue opening 5 to be connected is made of a corrosion-resistant metal material such as a stainless steel plate, or a stainless steel plate or FRP is placed on concrete.
An inclined surface 6 formed by lining is provided. The exhaust pipe 4 is made of a corrosion-resistant metal material such as a stainless steel plate, or by disposing a corrosion-resistant metal material such as a stainless steel plate inside an iron plate or the like. Reference numeral 7 denotes a drifting plate made of a corrosion-resistant metal material such as a stainless steel plate, which is disposed on the exhaust pipe 4 near the flue opening 5 where the chimney 3 and the exhaust pipe 4 are connected. It will be installed vertically. In addition, the deflection plate 7 is configured such that the deflection angle of each of the deflection plates 7 is the same or the deflection angle of each of the deflection plates 7 is made uneven, so that the extension line of each of the deflection plates 7 converges near the inner wall of the chimney cylinder near the flue opening 5. The exhaust pipe 4 near the flue opening 5 is
Alternatively, each deflection plate 7 may be movable so that its deflection angle can be adjusted to an appropriate angle individually or together.

To explain the flow of exhaust gas in the above configuration, the exhaust gas containing supersaturated moisture generated in the boiler 1 and passed through the wet desulfurization device 2 is transferred to the exhaust pipe 4.
It enters the cylindrical body of the chimney 3 through the flue opening 5, and is controlled by the movable drift plate 7 installed near the flue opening 5, depending on the type of fuel to be burned in the boiler, the amount of exhaust gas, etc. After changing its deflection angle accordingly, it is introduced into the chimney opening to generate a swirling flow at the base of the cylinder of the chimney 3, and is guided by the inclined surface 6 provided at the base of the cylinder of the chimney 3. The air rises upwards inside the cylinder and is pulled up while swirling due to the pressure difference between the atmosphere and the inside of the chimney 3, so that it rises while swirling inside the cylinder over almost the entire length of the chimney 3 and is exhausted. As the exhaust gas containing supersaturated moisture rises while swirling inside the cylindrical body of the chimney 3, the heavy moisture is blown outward by the centrifugal force generated by the swirling movement of the exhaust gas. Since the exhaust gas has many opportunities to come into contact with the inner wall of the chimney 3 as it ascends through the chimney cylinder, fine moisture in the exhaust gas also becomes attached to the drain. As a result, most of the moisture in the exhaust gas condenses on the cooled inner wall of the cylinder and adheres to the inner wall of the cylinder of the chimney 3 and is removed as drain water. In addition, in order to make the deflection plate 7 freely movable and adjust its angle, the deflection angle of the deflection plate 7 can be adjusted individually according to the moisture content of the exhaust gas, the type of fuel burned in the boiler, the amount of exhaust gas, etc. Alternatively, by controlling the discharge angle and discharge speed of the exhaust gas discharged from the exhaust pipe 4 into the cylindrical body of the chimney 3 by making appropriate adjustments, the diameter and swirling speed of the swirling flow of the exhaust gas can be controlled. By changing the amount of water contained in the exhaust gas, the moisture contained in the exhaust gas can be efficiently collected on the inner wall of the cylinder of the chimney 3.

As described above, the present invention provides a movable flow deflection plate in the exhaust pipe of the desulfurization device connected to the flue mouth at the base of the chimney, in the vicinity of the flue mouth, thereby controlling the type of fuel burned in the boiler. The deflection angle of the deflection plate is changed according to the amount of exhaust gas, etc., and the exhaust gas is introduced into the chimney opening, and the vortex-like exhaust gas is brought into contact with the inner peripheral surface of the chimney over almost the entire length of the chimney, making it highly efficient in the chimney. Moisture can be removed from exhaust gas. In addition, the present invention does not have a rotating member or a water droplet collecting part inside or at the top of the chimney, making equipment construction and maintenance inspection easier. Also, since the moisture contained in the exhaust gas does not scatter into the atmosphere, afterburners are not required. It is economical as there is no need to use it.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the arrangement of a boiler, a wet desulfurization device, an exhaust pipe, and a chimney, FIG. 2 is a plan sectional view of a connection structure between a chimney and a wet desulfurization device, and FIG. 3 is a side sectional view. 1: Boiler, 2: Desulfurization equipment, 3: Chimney, 4:
Exhaust pipe, 5: Flue outlet, 7: Straight flow plate.

Claims (1)

[Scope of utility model registration request] At the chimney 3 to which the exhaust pipe 4 of the wet desulfurization equipment 2 connected to the boiler 1 is connected to the base, the chimney 3
A connection structure between a chimney and a wet desulfurization device, characterized in that one or more movable drift plates 7 are provided in the exhaust pipe 4 near the flue opening 5.