CN208418677U - A kind of intermediate header being suitable for super critical boiler underload flexibility operation - Google Patents

Abstract

The utility model discloses a kind of intermediate headers for being suitable for super critical boiler underload flexibility operation for belonging to conventional power generation technical field, including header main body, thin-wall tube and coaxial bourdon's tube；Vertical tube plates water-cooling wall inner stream flow can be caused to distribute non-uniform problem when flexibly running primarily directed to supercritical boiler water-cooling wall intermediate header load, increase by one by bourdon's tube that coaxial thin-wall tube is connected with header main body in the inside of header main body to evenly distribute working medium.When the utility model solves underload water-cooling wall intermediate header entrance mass dryness fraction deviation design mass dryness fraction by the bourdon's tube current equalizer, the assignment of traffic non-uniformity problem of intermediate header.By using the current equalizer, the minimum stable workload of super critical boiler can drop to 20~30%BMCR operating condition, guarantee the working range safety of water-cooling wall underload.

Description

A kind of intermediate header being suitable for super critical boiler underload flexibility operation

Technical field

The utility model belongs to conventional power generation technical field, and in particular to it is flexible that one kind is suitable for super critical boiler underload Property operation intermediate header.

Background technique

With the continuous improvement of the renewable energy such as wind energy and solar energy access electrical network capacity ratio, need coal unit deep Degree participates in peak load regulation network to balance the intermittent bring load variations due to renewable energy.National Development and Reform Commission, the energy Office proposes development thermoelectricity flexibility transformation in June, 2016 publication " about the notice for assigning thermoelectricity flexibility transformation pilot project " It is distinctly claimed out, China implements the flexibility transformation of 2.2 hundred million kilowatts of coal units during plan " 13 ", and unit is made to have depth Peak modulation capacity is spent, and further increases load -response-speed, part of generating units has rapid starting/stopping peak modulation capacity.Various regions power grid is successively The ancillary service regulation that various coal units participate in depth peak regulation is put into effect.From the point of view of development abroad, the end of the year 2017 Europe can Renewable source of energy generation amount has been over the generated energy of coal unit, and coal unit, which participates in flexibility operation, becomes irreversible Trend.

Super critical boiler is main force's unit of China's coal fired power generation, therefore, is improved flexible under super critical boiler underload Property service ability, especially underload steady operation ability be super critical boiler flexibility operation must solve the problems, such as.It is super to face Boundary's boiler at low load ability to work mainly includes two aspects: first, super critical boiler low load stable combustion ability；Second, surpass Boilers underload hydrodynamic force is safely operated ability.Wherein super critical boiler underload hydrodynamic force safe operation ability is mainly led The assignment of traffic problem of supercritical water cold wall water-cooling wall at low load is related to, this affects super critical boiler water at low load The safe operation problem of cold wall heating surface.Especially vertically arranged water cooling wall region, the at low load mass velocity in pipe It reduces, in addition the trouble free service problem of water-cooling wall is especially significant in furnace the problem of heat load distribution inhomogeneities.

It is badly in need of the novel intermediate header geometry of one kind thus to solve in supercritical boiler water-cooling wall underload down tube Water screen tube safe operation problem in parallel, guarantees under super critical boiler underload longtime running caused by assignment of traffic is uneven, The safe operation problem of vertical section water-cooling wall.

Utility model content

Aiming at the problem that background technique is previously mentioned, the utility model provides one kind and is suitable for super critical boiler underload spirit The intermediate header of activity operation, which is characterized in that including header main body, thin-wall tube and coaxial bourdon's tube；Wherein header main body is A piece horizontally disposed heavy wall tubular unit introduces the top that pipe is equidistantly vertically arranged to header main body tube wall, branched pipe water Safety is loaded on the two sides of header main body tube wall, and is serrated and is staggered；The branched pipe of side, for one group, and is drawn with each The position for entering pipe corresponds；The branched pipe of the other side, for one group, is installed between a side branched pipe corresponding with every two Position on；And every branched pipe axis and the corresponding angle for introducing pipe axis are all 90 degree；

It is welded on the inside of the both ends of coaxial bourdon's tube and the both ends of the surface of header main body；The two sides up and down point of coaxial fluted shape tube wall It is not provided with connecting hole and fluted shape hole, and the position of connecting hole and introducing pipe correspond, the position in fluted shape hole and branched pipe are one by one It is corresponding；Connecting hole is connected by thin-wall tube with pipe is introduced, and is welded on the inside of the both ends of coaxial bourdon's tube and the both ends of the surface of header main body.

The fluted shape hole and the connecting hole are in 175 degree~185 degree angles in the circumferential.

The size of the header main body is 219 × 60mm of φ, length range 10m~12m；Introduce pipe size be φ 38 × The size of 6.5mm and branched pipe is 31.8 × 5.5mm of φ.

The diameter in the fluted shape hole is identical as the aperture of branched pipe.

The wall thickness of the coaxial bourdon's tube is 1~3mm, the diameter of coaxial bourdon's tube be equal to header main body internal diameter 1/2~ 2/3。

The utility model has the following beneficial effects:

Using a kind of intermediate header flow distribution device of inner sleeve, super critical boiler difference entrance mass dryness fraction range is improved It is interior, in vertical tube water screen tube the problem of assignment of traffic uniformity, current supercritical boiler water-cooling wall is solved due to underload spirit Under active operating status, intermediate header entrance operating status deviates when design point in caused flow deviation and parallel branch pipe The problem of assignment of traffic, reduces the minimum stable operating load of direct current cooker.

Detailed description of the invention

Fig. 1 is in a kind of intermediate header embodiment for being suitable for super critical boiler underload flexibility operation of the utility model The face upwarding section of intermediate header branched pipe；

Fig. 2 is the lateral sectional view of the utility model embodiment；

Fig. 3 is the top cross-sectional view of the utility model embodiment；

Fig. 4 is the sectional view of A-A section in Fig. 3；

In figure: 1- header main body, 2- branched pipe, the coaxial bourdon's tube of 3-, 4- introduce pipe, 5- fluted shape hole, 6- thin-wall tube, 7- company Connect hole.

Specific embodiment

Different from conventional Supercritical boiler intermediate header geometry, the utility model is used and is installed additional inside intermediate header The design method of coaxial bourdon's tube, is explained with reference to the accompanying drawing.

As shown in Figure 1, the introducing water-cooling wall intermediate header radial vertically downward that power plant uses at present, geometry form master Include: header main body 1 (219 × 60mm of φ, length range 10m~12m), introduce pipe 4 (38 × 6.5mm of φ) and branched pipe 2 (φ31.8×5.5mm)；Wherein header main body 1 is a horizontally disposed heavy wall tubular unit, introduces the equidistant vertical peace of pipe 4 Top loaded on 1 tube wall of header main body, branched pipe 2 are horizontally installed to the two sides of 1 tube wall of header main body, and are serrated staggeredly Setting；The branched pipe 2 of side, for one group, is corresponded with each with the position for introducing pipe 4；The branched pipe 2 of the other side is with every Two are one group, are installed between a side branched pipe 2 on corresponding position；And every 2 axis of branched pipe draws with corresponding The angle for entering 4 axis of pipe is all 90 degree.

As shown in Figure 2 to 4, intermediate header includes header main body 1, thin-wall tube 6 and coaxial bourdon's tube 3, coaxial bourdon's tube 3 The two sides up and down of tube wall have connecting hole 7 and fluted shape hole 5, and the position of connecting hole 7 and introducing pipe 4 correspond, fluted shape The position in hole 5 and branched pipe 2 correspond；Fluted shape hole 5 and connecting hole 7 are in 175 degree~185 degree angles in the circumferential；Connecting hole 7 are connected by thin-wall tube 6 with pipe 4 is introduced；

In coaxial bourdon's tube 3, the diameter in fluted shape hole 5 is identical as the opening diameter of branched pipe 2, according to the actual needs may be used To adjust the diameter of aperture；

The wall thickness of coaxial bourdon's tube 3 is 1~3mm, and the diameter of coaxial bourdon's tube 3 is the 1/2~2/ of 1 internal diameter of header main body 3。

When installation, the both ends of thin-wall tube 6 are connected with connecting hole 7 and introducing pipe 4 respectively using expanded joint；The one of thin-wall tube 6 The junction shape of end and connecting hole 7 is coincide and the other end is straight tube；By undertaking the gravity of coaxial bourdon's tube 3 and being heated swollen It is swollen to fit closely the two, it ensure that and be not in gap when thin-wall tube 6 and connecting hole 7 connect and generate additional flowing resistance Power.

After installation, keep connection between thin-wall tube 6 and the coaxial bourdon's tube 3 of centre, not only kept certain supporting role but also It is introduced into working medium is smooth in inner sleeve, annular region is then entered by aperture, subsequently into parallel branch pipe.Thin-wall tube 6 It is connected with coaxial bourdon's tube 3 by connecting hole 7, while coaxial 3 both ends of bourdon's tube and the both ends of header main body 1 use welding manner Connection；The two simultaneously plays a supporting role to coaxial bourdon's tube.

After installation, the axial position and 2 aperture axial position of branched pipe in coaxial fluted shape hole 5 are corresponded.

When the present embodiment works, working medium is introduced into coaxial bourdon's tube 3 from being introduced into pipe 4 and pass vertically downwards through thin-wall tube 6；Work After matter is flowed out by the fluted shape hole 5 of lower section, in the annular space that is surrounded into coaxial bourdon's tube 3 and header main body 1；Working medium is in ring It is flowed out after shape space uniform flow by branched pipe 2.

When the present embodiment works, coaxial bourdon's tube 3 plays the effect of current equalizer, and working medium is drawn from introducing pipe 4 by thin-wall tube 6 Enter bourdon's tube 3, then enters the annular that coaxial bourdon's tube 3 is formed with header main body 1 from the fluted shape hole 5 of coaxial bourdon's tube 3 respectively In cavity, while guaranteeing that pressure size is almost the same everywhere in working medium in annular space, therefore each branched pipe 2 flows out two-phase fluid The flow of working medium can guarantee essentially identical.

The present embodiment improves different flow pattern two-phases when underload water-cooling wall intermediate header entrance mass dryness fraction deviates design mass dryness fraction Flow partition characteristic in each branched pipe of intermediate header, reduce water-cooling wall vertical tube plates because assignment of traffic it is uneven caused by it is each vertical Tube panel thermal stress is excessive, reaches and reduces boiler water wall life consumption, guarantees the purpose of boiler water wall safe operation.

After the present embodiment, the minimum stable workload of super critical boiler can drop to 20~30%BMCR operating condition, protect Demonstrate,prove the working range safety of water-cooling wall underload.

Claims (5)

1. a kind of intermediate header for being suitable for super critical boiler underload flexibility operation, which is characterized in that including header main body (1), thin-wall tube (6) and coaxial bourdon's tube (3)；Wherein header main body (1) is a horizontally disposed heavy wall tubular unit, is introduced Pipe (4) is equidistantly vertically arranged to the top of header main body (1) tube wall, and branched pipe (2) is horizontally installed to header main body (1) tube wall Two sides, and be serrated and be staggered；The branched pipe (2) of side, for one group, manages the position of (4) one by one with introducing with each It is corresponding；The branched pipe (2) of the other side, for one group, is installed between a side branched pipe (2) on corresponding position with every two； Every branched pipe (2) axis and the corresponding angle for introducing pipe (4) axis are all 90 degree；

It is welded on the inside of the both ends of coaxial bourdon's tube (3) and the both ends of the surface of header main body (1)；Above and below coaxial bourdon's tube (3) tube wall Two sides have connecting hole (7) and fluted shape hole (5), and the position of connecting hole (7) and introducing pipe (4) correspond, fluted shape hole (5) position and branched pipe (2) corresponds；Connecting hole (7) is connected by thin-wall tube (6) with pipe (4) is introduced.

2. a kind of intermediate header for being suitable for super critical boiler underload flexibility operation according to claim 1, special Sign is that the fluted shape hole (5) and the connecting hole (7) are in 175 degree~185 degree angles in the circumferential.

3. a kind of intermediate header for being suitable for super critical boiler underload flexibility operation according to claim 1, special Sign is that the size of the header main body (1) is 219 × 60mm of φ, length range 10m~12m；Introduce pipe (4) size be The size of 38 × 6.5mm of φ and branched pipe (2) is 31.8 × 5.5mm of φ.

4. a kind of intermediate header for being suitable for super critical boiler underload flexibility operation according to claim 1, special Sign is that the diameter of the fluted shape hole (5) is identical as the aperture of branched pipe (2).

5. a kind of intermediate header for being suitable for super critical boiler underload flexibility operation according to claim 1, special Sign is that the wall thickness of the coaxial bourdon's tube (3) is 1~3mm, and the diameter of coaxial bourdon's tube (3) is equal to header main body (1) internal diameter 1/2~2/3.