CN201909304U

CN201909304U - Racking pipe preheating device for coal economizer of circulating fluidized bed boiler

Info

Publication number: CN201909304U
Application number: CN2010206920705U
Authority: CN
Inventors: 陈长龙
Original assignee: SHUANGYASHAN HONGYAN THERMAL POWER CO Ltd HEILONGJIANG LONGMAY MINING HOLDING GROUP CO Ltd
Current assignee: SHUANGYASHAN HONGYAN THERMAL POWER CO Ltd HEILONGJIANG LONGMAY MINING HOLDING GROUP CO Ltd
Priority date: 2010-12-23
Filing date: 2010-12-23
Publication date: 2011-07-27
Anticipated expiration: 2020-12-23

Abstract

The utility model relates to a racking pipe preheating device for a coal economizer of a circulating fluidized bed boiler, which consists of a lower stage coal economizer inlet collection box, an upper stage coal economizer outlet collection box, an expansion collection box and a preheating racking pipe, wherein the preheating racking pipe consists of a plurality of water pipes, and both ends of each preheating racking pipe are respectively matched and fixedly welded with each unthreaded hole formed at one side of the lower stage coal economizer inlet collection box and the expansion collection box. The coal economizer can solve the problems of expansion, warpage, deformation and leakage between two stages of coal economizers, and the defect of serious influence on the boiler yield caused by simultaneous disconnection through throwing during the pipe throwing can also be avoided. After a vertical pipe is omitted and a middle expansion collection box is added, the leakage of the coal economizer is eliminated, so water in each pipe is uniformly heated, the racking pipe is not easy to deform, and considerable economic benefits can be brought.

Description

CFBB economizer comb preheating device

Affiliated technical field:

The utility model relates to CFBB equipment, especially CFBB economizer comb preheating device.

Background technology:

At boiler tail the economizer device is installed before CFBB dispatches from the factory, its objective is the boiler tail waste heat recovery.Because the comb of its economizer is closeer, the position difference, the water amount is inconsistent in the pipe, and it is inhomogeneous to be heated, and it is serious to expand, and comb is very easy to distortion and burns out.CFBB economizer hand progression divides two-stage up and down, and it is economizer inlet collection case and economizer exit collection case that this economizer has two collection casees.Economizer does not up and down collect case in the middle of the two-stage, the two-stage economizer is connected with standpipe in two-stage pipe row middle part up and down.Weld membrane wall between this economizer tube and tube.Boiler is in operation because there is thermal expansion problem in economizer hand, the close together swelling blockage of the u shape bending moment furnace wall of pipe row both sides, both sides furnace wall top is bad, and economizer hand distortion becoming s is curved, cause flue gas flow rate, mass flow discrepancy, concentrated wear seriously causes leakage.When economizer hand expands up and down, only there are not enough swell incremenies owing to collect case between the two-stage economizer with the standpipe connection, so cause the standpipe distortion when two-stage economizer expands mutually up and down, and standpipe two ends mills formula wall weld bond drawn back cause leakage, since economizer hand is arranged closely and gross distortion can't weld, have only blow-by tube row got rid of.But because header in the middle of not having between the two-stage economizer, can only about the two-stage economizer get rid of simultaneously and have a strong impact on exerting oneself of boiler.Owing to do not support girder steel below the two-stage economizer up and down, only by the both sides stent support, the centre is all unsettled, the waist metaboly so collapsing appears in the economizer that is in operation for 6m economizer how long.

Summary of the invention:

Be heated inhomogeneous in order to overcome boiler economizer, yielding, and serious deficiency expands, the utility model provides a kind of CFBB economizer comb preheating device, header in the middle of increasing between the two-stage economizer up and down, standpipe between the cancellation two-stage economizer connects, and leaves enough coefficients of expansion up and down for the two-stage economizer, has eliminated the defective that membrane wall weld bond place in standpipe two ends between the two-stage economizer draws back leakage easily.

The scheme that the utility model solves its technical problem is by subordinate's economizer inlet collection case, higher level's economizer exit collection case, the collection case expands, the preheating comb constitutes, subordinate's economizer inlet collection case is identical with higher level's economizer exit collection case, with subordinate's economizer inlet collection case is example, subordinate's economizer inlet collection case is by body, end socket, water inlet pipe is formed, the axial straight line of body is evenly equipped with unthreaded hole, one end is an end socket, end socket cooperates solid welding with water inlet pipe and body, end has end socket in addition, end socket cooperates solid welding with inspection socket and body, the axial both sides of the collection case straight line that expands is evenly equipped with unthreaded hole, two ends are end socket, end socket cooperates solid welding with body, one end has inspection socket, and inspection socket cooperates solid welding with end socket, and the preheating comb is made up of many water pipes, each root preheating comb two ends cooperates solid welding with each unthreaded hole of the subordinate's economizer inlet collection case and collection case one side that expands respectively, and remaining preheating comb two ends cooperates solid welding with each unthreaded hole of the higher level's economizer exit collection case and the collection case that expands respectively.

The beneficial effects of the utility model are: economizer can solve the expansion between the two-stage economizer, the waist that collapses, distortion, leakage problem, can avoid again getting rid of when pipe up and down two-stage get rid of the defective that has a strong impact on boiler output simultaneously.The cancellation standpipe increases behind the intermediate expansion collection case economizer leakage to be eliminated and makes the water in each pipe be heated evenly, and comb is not yielding, burn out, and can bring considerable economic.

Description of drawings:

Fig. 1. be the utility model structural front view;

Fig. 2. be the utility model sectional side view.

The specific embodiment:

The utility model is by subordinate's economizer inlet collection case, higher level's economizer exit collection case, the collection case expands, the preheating comb constitutes, subordinate's economizer inlet collection case 7 is identical with higher level's economizer exit collection case 1, with subordinate's economizer inlet collection case 7 is example, with reference to Fig. 1, subordinate's economizer inlet collection, 7 by body, end socket 6, water inlet pipe 8 is formed, the axial straight line of body is evenly equipped with unthreaded hole, one end is an end socket 6, end socket 6 cooperates solid welding with water inlet pipe 8 and body 7, end has end socket 10 in addition, end socket 10 cooperates solid welding with inspection socket 9 and body 7, and the collection case 2 axial both sides straight lines that expand are evenly equipped with unthreaded hole, and two ends are

end socket

3,11,

end socket

3,11 cooperate solid welding with body 2, one end has inspection socket 4, and inspection socket 4 cooperates solid welding with end socket 3, and preheating comb 5 is made up of many water pipes, each root preheating comb 5 two ends cooperates solid welding with each unthreaded hole of the subordinate's economizer inlet collection case 7 and collection case 2 one sides that expand respectively, and remaining preheating comb two ends cooperates solid welding with each unthreaded hole of the higher level's economizer exit collection case 1 and the collection case 2 that expands respectively.

Claims

1. CFBB economizer comb preheating device is by subordinate's economizer inlet collection case, higher level's economizer exit collection case, the collection case expands, the preheating comb constitutes, it is characterized in that: subordinate's economizer inlet collection case is by body, end socket, water inlet pipe is formed, the axial straight line of body is evenly equipped with unthreaded hole, one end is an end socket, end socket cooperates solid welding with water inlet pipe and body, end has end socket in addition, end socket cooperates solid welding with inspection socket and body, the axial both sides of the collection case straight line that expands is evenly equipped with unthreaded hole, two ends are end socket, end socket cooperates solid welding with body, one end has inspection socket, inspection socket cooperates solid welding with end socket, the preheating comb is made up of many water pipes, each root preheating comb two ends cooperates solid welding with each unthreaded hole of the subordinate's economizer inlet collection case and collection case one side that expands respectively, and remaining preheating comb two ends cooperates solid welding with each unthreaded hole of the higher level's economizer exit collection case and the collection case that expands respectively.