JPS5823045Y2 - Structure of furnace wall tube branch - Google Patents

Description

[Detailed description of the invention] In a boiler or heating furnace, a part of the wood tube, evaporator tube, steam cooling wall tube, or superheating tube (hereinafter referred to as the furnace wall tube) constituting the peripheral wall of the furnace is branched from the wall and When used for this purpose, the problem is how to configure the gas seal at the branch part and the furnace wall tube downstream of the branch part.

For example, by injecting and diffusing ammonia (NH3) into high-temperature gas in a specific temperature range of a boiler, nitrogen oxides (
An injection device for reducing NOx) is sometimes attached, and this is the case when selecting the system and configuration of the cooling pipe that constitutes this chemical injection nozzle.

The minimum performance requirements for this cooling system are 1. Have sufficient in-tube flow rate and fluid weight velocity to cool the nozzle.

2. This includes using part of the circulation system, such as a boiler or heating furnace, to facilitate operation and maintenance.

Considering these conditions, it is optimal to branch off a part of the furnace wall tube from the boiler or heating furnace to form a cooling tube for the nozzle, and then return it to the circulation system after leaving the nozzle. This is related to the structure of such a furnace wall tube branch.In a structure in which a part of the furnace wall tube is branched from the furnace wall, which is composed of a large number of furnace wall tubes arranged in parallel, The adjacent pipe and the downstream side of the branched pipe are connected to the bent part of the adjacent pipe using a Y-piece, and the pipes at the branched part are sealed using fins. It is characterized by the fact that

To explain the embodiment with reference to FIGS. 1 to 6, the furnace wall tube holding the internal fluid 10 is constructed of a membrane wall, and the branch tube 2 is connected to the adjacent tube 8 from the center of the furnace wall tube to the outside of the furnace. 4, bend it and attach the Y piece 6.

Each tube is gas-sealed by a seal fin 7, but in order to prevent the seal fin from burning out due to high-temperature gas, the adjacent tube 5 is suitably bent to keep the temperature of the fin below a specified value. Reduce the width of

This branch part 1 is made into blocks at the factory, and when an existing boiler is being remodeled, multiple blocks can be shipped to the site to reduce the number of on-site construction steps, and membrane walls can be manufactured for new boilers. After that, cut out the corresponding part of the branch and insert this block so that it can be assembled.

Note that FIGS. 3 and 4 show examples in which the present invention is applied to a tangent panel and a peg fin panel, respectively, and the gas sealing of the branch pipe 2 portion can also be performed using a casing box.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 1a is a side view thereof, Fig. 2 is a vertical cross-sectional view along II-II of Fig. 1, and Figs. 3 to 6 are implementations of each side. It is a front view side view and a longitudinal cross-sectional view which show an example. 2... Branch pipe, 3... Downstream side of branch pipe 2, 4... Adjacent pipe, 6... Y piece.

Claims (1)

[Scope of utility model registration request] In a structure where a part of the furnace wall tube is branched from the furnace wall, which is composed of a large number of furnace wall tubes arranged in parallel, the tube adjacent to the branch tube is bent at the branch part, and the adjacent tube and the branch tube are bent. A structure of a furnace wall tube branch portion, characterized in that the downstream side and the bent portion of the adjacent tube are connected by a Y piece, and the tubes of the branch portion are sealed with fins.