CN-122015072-A - 650 ℃ High-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure

CN122015072ACN 122015072 ACN122015072 ACN 122015072ACN-122015072-A

Abstract

The invention discloses a 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end part leading-out structure, relates to the technical field of boilers, and solves the problem that a main and reheat steam outlet header of a tower boiler reaches the upper use limit of ferrite heat-resistant steel. The invention comprises a collecting header, connecting pipes, a small header and an outlet pipe joint, wherein each pipe screen of a final superheater or a final reheater of a tower boiler is communicated with one small header through the outlet pipe joint, two connecting pipes are symmetrically arranged on the small header and are communicated with the collecting header through the connecting pipes, and the collecting header, the connecting pipes and the small header are all made of iron-nickel-based high-temperature alloy materials. According to the invention, through the two-stage mixed small header end extraction structure of the main and reheat steam outlet header, the temperature deviation between pipes can be reduced, the thermal stress caused by the pipe deviation in the conventional large header scheme is effectively eliminated, the wall thickness of the collecting header and the specification of the header pipe joint are reduced, the thermal stress is reduced because the thermal stress is in direct proportion to the wall thickness, and the pressure resistance is improved.

Inventors

WANG TING
WANG YUPENG
TANG PANPAN
HUANG YING
YE HUAN
WANG JINGJIE
YIN YANING
SUN HONGMIN
WANG YONGJIE
DONG QINGMEI
SONG GUOQING

Assignees

哈尔滨锅炉厂有限责任公司
哈尔滨哈锅能源动力科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (10)

1. A650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure is characterized by comprising a collecting header (1), two connecting pipes (2) and a small header (3), wherein each pipe screen of a final superheater or a final reheater in a tower boiler is communicated with one small header (3), two connecting pipes (2) are symmetrically arranged on the small header (3), one end of each connecting pipe (2) is communicated with the small header (3), and the other end of each connecting pipe is communicated with the collecting header (1).
2. The 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure according to claim 1, wherein the connecting position of the connecting pipe (2) and the small header (3) is positioned at the end of the small header (3).
3. The 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure according to claim 1, further comprising an outlet pipe joint (4), wherein one end of the outlet pipe joint (4) penetrates through a water cooling wall (5) of the tower boiler and is communicated with a tube panel of a final superheater or a final reheater, and the other end of the outlet pipe joint is communicated with the small header (3).
4. The 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure according to claim 3, wherein the outlet pipe joint (4) is fixedly connected with the water cooling wall (5).
5. The 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure according to claim 3, wherein the connection position of the outlet pipe joint (4) and the small header (3) is positioned at the lower part of the small header (3).
6. The 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure according to claim 5, wherein the outlet pipe joint (4) is an L-shaped pipe.
7. The 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure according to claim 6, wherein the outlet pipe joint (4) is made of iron-nickel-based superalloy material GH4070T.
8. The 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure according to claim 1, wherein the connecting pipe (2) is made of iron-nickel-based superalloy material GH2070P.
9. The 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure according to claim 1, wherein the collecting header (1) and the small header (3) are made of iron-nickel-based superalloy materials GH2070P.
10. A working method for the 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure is characterized in that working media in a final superheater or a final reheater tube panel of the tower boiler enter the small header (3) through an outlet tube joint (4) to be mixed once, and then enter a collecting header (1) through a connecting tube (2) to be mixed with working media in other tube panels.

Description

650 ℃ High-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure Technical Field The invention relates to the technical field of environment-friendly processing, in particular to a 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure. Background At present, the main and reheat steam temperatures of the high-efficiency ultra-supercritical boiler in China reach 610 ℃ per 625 ℃, the main and reheat steam outlet header, the pipeline and the pipe joint adopt P92/T92, the main and reheat steam outlet header of the tower boiler adopts a large header scheme, and the upper limit of the use of ferrite heat-resistant steel is reached. A novel iron-nickel-based superalloy material GH2070P developed by the Western An thermal institute of technology is selected and used for designing main and reheat steam outlet header and pipeline of a 650 ℃ high-efficiency ultra-supercritical boiler. The parameters of the 650 ℃ high-efficiency ultra-supercritical boiler are 36.65MPa.g 655℃/653℃, if a conventional large header scheme is designed for the main and reheat steam outlet headers, the temperature of the main and reheat steam outlets are respectively increased by 45℃/25℃, the temperature deviation of the pipe joint is larger, the thermal stress concentration is easier at the joint of the large header and the pipe joint, and the thermal fatigue damage failure is easy to occur. The current stage provides requirements for the rapid load-changing speed and safe and reliable technology, so that the thick-wall header is subjected to thermal deformation, thermal stress and thermal fatigue under the action of high transient state, strong impact and fluid-thermal force solid coupling, and the header is caused to be cracked in fatigue and the welded joint is caused to be broken. GH2070P is an aging strengthening type iron-nickel base alloy material, is mainly used in the fields of aerospace and the like, is used for a large number of pressed parts in the boiler manufacturing industry, belongs to the first example, has the advantages of high material thermal expansion coefficient, low heat conductivity and high thermal cracking sensitivity, has the tendencies of welding thermal cracking, liquefying cracking, reheating cracking and strain aging cracking, is high in manufacturing, field installation and overhaul difficulty, extremely strict in quality control, and can lead to increased welding stress and increased welding seam cracking risk as the outside diameter of a GH2070P header and the specification of a pipe joint are larger, so that the structure of a key part of a boiler designed by using the novel iron-nickel base superalloy material GH2070P directly influences the long-term safe operation of the boiler. Disclosure of Invention The invention aims to solve the problem that the main and reheat steam outlet headers of the existing tower boiler reach the upper limit of use of ferrite heat-resistant steel, and provides a 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end extraction structure. According to the invention, through the two-stage mixed small header end extraction structure of the main and reheat steam outlet header, the temperature deviation between pipes can be reduced, the thermal stress caused by the pipe deviation in the conventional large header scheme can be eliminated more effectively, the wall thickness of the collecting header and the specification of the header pipe joint can be reduced, the thermal stress is reduced because the thermal stress is in direct proportion to the wall thickness, the pressure resistance is improved, and the flexible operation is facilitated. The invention provides a 650 ℃ high-efficiency ultra-supercritical tower boiler small header double-stage mixed end part leading-out structure which specifically comprises a collecting header, two connecting pipes and a small header, wherein each pipe screen of a final-stage superheater or a final-stage reheater in a tower boiler is communicated with one small header, two connecting pipes are symmetrically arranged on the small header, one end of each connecting pipe is communicated with the small header, and the other end of each connecting pipe is communicated with the collecting header. Further, the connection position of the connection pipe and the small header is positioned at the end part of the small header. Still further still include the outlet pipe joint, outlet pipe joint one end passes tower boiler's water-cooled wall and last superheater or last reheater's tube panel intercommunication, and the other end communicates with the small header. Further, the outlet pipe joint is fixedly connected with the water cooling wall. Further, the connection position of the outlet pipe joint and the small header is positioned at the lower part of the small header. Further, the outlet pipe joint is an L-shaped