JPS6119282Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a steam generation and superheating device, which was born out of research into a device that can generate superheated steam at a rate of about 135 tons/hour.

This invention will be explained with reference to illustrated embodiments.

According to this invention, the gas passage 3 includes a furnace chamber 1 and a gas passage 3 including a steam superheating tube 2, and the gas passage approaches the side surface of the furnace chamber and directs gas exiting from the furnace chamber to the gas passage 3.
It is spaced from the furnace chamber by the width of a passage (hereinafter referred to as idle passage 4) leading to the steam, which is cooled only by the fluid flowing through the tubes contained in the boundary wall 5 of this idle passage. A generating and superheating device is provided.

The tubes included in the boundary wall of the idle path 4 may also be included in the boundary wall 5a of the furnace chamber and/or the boundary wall 5b of the gas duct.

Gas passage boundary wall 5b and furnace chamber boundary wall 5a
may be liquid cooled.

The lower end 6 of the furnace chamber may be arranged to communicate with the lower end of the idle path, and the upper end 7 of the idle path may communicate with the upper end of the gas passage.

The gas passage includes an economizer 8 located below the superheater, the tubes extending upwards from the economizer to a steam-water drum 9 located at the top of the steam generating superheater and acting as a support for the superheater 2. You can.

In the steam generation and superheating apparatus according to one embodiment of this invention, the air/water drum 9 is mounted 7.6 m above the water drum 10 and parallel to the water drum. Approximately 90cm
Two boundary walls 5 apart forming an idle path
The tube banks a, 5b extend between the drums, and the gap between each adjacent tube is closed with a web, except at the bottom of the tube group on one boundary wall and at the top of the tube group on the other boundary wall. In areas where the web is not provided, every other tube is bent to facilitate gas flow across the tube row in these areas.

Another set of tubes extends between the drums 9, 10 on opposite sides of each side of the idle path. The gaps between adjacent tubes of each set are also closed with webs. This set of pipes 11 is the roof of the furnace room,
Forming the floor and the outer wall, the inner wall of the furnace chamber is formed by a row of tubes whose lower part is not closed with a web. Boundary wall 5a as an inner wall and tube 1 as an outer wall
The distance between 1 is about 4m. The other set of tubes 12
form the roof, floor and outer wall of the gas passage 3, and the boundary wall 5b, which is the inner wall of the gas passage 3, is also formed with other rows of tubes. The interval between the boundary wall 5b, which is the inner wall, and the tube 12, which is the outer wall, is about 1.5 m. The web is placed between the sections of the other sets of tubes in the roof of the gas passage 3. In the outer wall of the gas passage 3 there is a gap in the section of the tube close to the floor, and every other section of the tube 13 close to the floor is bent so that it lies outside the plane containing the remaining sections. This row of tubes close to the floor forms the outlet 14 of the gas passage, and the outer wall 12 is covered on the outside with a casing.

Furnace chamber 1, idle path 4 and gas passage 3 are approximately
It is formed with parallel tubes extending between headers 15a, 15b and 16a, 16b with closed webs between the side walls and the tubes 7.6 m apart.

A large diameter downcomer pipe 18 connects the drums to each other. Downcomer pipe 18 is located outside the side wall and serves as a water-cooled support for the steam generating superheater. It is foreseeable that tubes included in other sets of tubes may also act as downcomers.

The floor of the furnace room is tiled and the furnace is lit from the roof. Alternatively, the furnace chamber may be ignited from the side wall in small steam generators or from the front wall in large steam generators.

At the lower end of the gas passage, there is an economizer 8 made of a finless tube, which is arranged to flow water supply opposite to the gas flow. The outlet pipe section 19 (hereinafter referred to as leg) of the economizer extends along the inside of the gas passage to the air-water drum. The legs 19 act as supports for a self-draining superheater 2 mounted on top of the economizer, the superheater consisting of primary and secondary superheater sections or with an attemperator (not shown) between these sections. It may be arranged to form two passages with. The gaps between the tubes in the outer wall 12 of the gas passage 3 are used for inserting and mounting unit tubes constituting the superheater and reheater.

In order to make it possible to transport the steam generating and superheating device, it is proposed to build it in two parts, one part consisting of the furnace chamber and the other part consisting of the gas ducts and drum. These parts are joined together in the field, and the idle path 4 facilitates this joining operation by providing the necessary access space for the work.

In the operation of the steam generating and superheating device, the boundary wall 5 of the furnace chamber, the idle path 4 and the gas passage 3 are cooled with water. The idle path 4 is exclusively cooled by the tubes of the boundary walls 5a and 5b, and acts as a secondary furnace by entering a long flame, that is, the idle path 4 is a convection heating zone in which the combustion gas, which is a combustion product, forms a gas passage. This provides residence time for combustion to be completed before entering the combustion chamber. The combustion gases pass from the furnace chamber 1 upwardly through the idle path 4 and then downwardly through the gas passage 3 and are discharged from the flow bed.

Although pressurized air from a forced draft fan is introduced into the space between the outer wall 12 of the gas passage 3 and the casing (not shown) to perform pressurized combustion with a flame, the Balanced draft combustion is also possible in which an equilibrium point occurs in the gas duct 3.

The above design generates steam at a rate of about 135 tons/hour, but at the same time it generates steam at a rate of 45 to 450 tons/hour.
It is also adapted to economically generate steam at a rate of 1. The aforementioned design allows for clean operation, easy access to the steam generation superheater during shutdown, and no problems with cold storage (draining water from the superheater). Since the parts are made to be easily transported, it is possible to use factory assembly as much as possible. Large-scale use of assembled panels can simplify construction without requiring large amounts of refractory materials or airtight steel casing, and requires a light cladding to protect insulation mounted on the outside of the panel All you have to do is

In a variant of the device described above, the lower drum has 1
One or more headers may be replaced.

[Brief explanation of the drawing]

The accompanying drawings are schematic explanatory diagrams showing the structure of the steam generation and superheating device according to this invention. In the figure, 1 is the furnace chamber, 2 is the steam superheating tube, 3 is the gas passage, 4 is the idle path, 5, 5a, 5b
indicates the boundary wall of the idle path.

Claims (1)

[Scope of utility model registration request] A furnace chamber and a gas passage containing a steam superheating tube are provided on each side of the idle pass, and the combustion gas coming out of the furnace chamber is discharged through the idle pass and the gas passage, and the idle pass is cooled by the fluid flowing through the tube included in its boundary wall. In the steam generation superheating unit, the tubes included in the boundary wall of the idle path are also included in the boundary wall of the furnace chamber, the tubes included in the boundary wall of the idle path are also included in the boundary wall of the gas passage, and the tubes included in the boundary wall of the idle path are also included in the boundary wall of the gas passage, The boundary wall of the passage is water-cooled, the lower end of the furnace chamber leads to the lower end of the idle pass, the upper end of the idle pass leads to the upper end of the gas passage, the boundary wall of the furnace chamber is water-cooled, and the gas passage is connected to the superheater. an economizer located below, with tubes extending from the echomizer above an air-water drum located at the top of the unit, configured to act as a support for the superheater, and further transporting the entire device into the furnace chamber. A steam generation and superheating device characterized in that it is a separate assembly of a section and a section consisting of a gas passage and both drums.