CN-122015011-A - Concentrated air supply construction method and system for unit boiler construction

CN122015011ACN 122015011 ACN122015011 ACN 122015011ACN-122015011-A

Abstract

The invention discloses a concentrated air supply construction method and system for unit boiler construction, and relates to the technical field of auxiliary equipment for building engineering construction, wherein the method comprises the steps of intensively arranging a first air supply source and a second air supply source in a boiler bottom layer area; constructing a conveying network extending to each operation layer along the height of the boiler, wherein the conveying network comprises a lifting pipeline and a branch pipeline; setting a pressure regulating and controlling assembly comprising a primary regulating and controlling unit and a secondary regulating and controlling unit, and respectively controlling the medium pressure at the tail ends of the rising pipeline and the branch pipeline; the invention effectively solves the problems of low efficiency, large potential safety hazard and serious resource waste of the existing scattered air supply mode and realizes the efficient, stable and safe transportation of industrial fuel gas in an overhead operation scene by intensively arranging air sources, constructing a pipeline transportation network and setting graded pressure regulation.

Inventors

JI ZHIFENG
XU JUNXIAN
WANG YANGYU
ZHANG HAOTIAN
HU GUN

Assignees

中国能源建设集团江苏省电力建设第三工程有限公司

Dates

Publication Date: 20260512
Application Date: 20260331

Claims (10)

1. The concentrated air supply construction method for the unit boiler construction is characterized by comprising the following steps of: Providing a first air supply source and a second air supply source, and intensively arranging the first air supply source and the second air supply source in a boiler bottom layer area; constructing a conveying network extending from the bottom layer area to each operation layer along the height direction of the boiler, wherein the conveying network comprises at least one rising pipeline and a plurality of branch pipelines which are communicated with the rising pipeline and distributed on each operation layer; The pressure regulating and controlling assembly comprises a primary regulating and controlling unit and a secondary regulating and controlling unit, wherein the primary regulating and controlling unit is used for controlling the medium pressure in the rising pipeline to be in a first preset range, and the secondary regulating and controlling unit is arranged at the tail end of a branch pipeline of each operation layer so as to regulate the medium pressure to a second preset range; and arranging an air terminal at the tail end of the branch pipeline of each working layer so as to enable the construction equipment to be communicated with the conveying network.
2. The method for constructing a unit boiler construction centralized air supply according to claim 1, further comprising a path planning step of simulating the laying paths of the rising pipeline and the branch pipeline based on a three-dimensional model of the boiler structure to avoid the boiler body structure and a preset permanent equipment installation area before constructing the conveying network.
3. The method for constructing a unit boiler construction central gas supply construction according to claim 1, wherein the step of constructing a transport network further comprises: Laying the rising pipeline along the upright post of the boiler steel frame and fixing the rising pipeline at intervals through a fixing component; and laying the branch pipelines along the bottom of the working layer platform beam.
4. The method for constructing the concentrated gas supply for the unit boiler construction according to claim 1, further comprising a pressure testing step of applying test pressure to the conveying network and maintaining the pressure after the completion of the construction of the conveying network, and monitoring whether the pressure drop is within an allowable threshold.
5. The method for constructing the concentrated gas supply for the unit boiler according to claim 1, wherein the first gas supply source is an oxygen source, and the second gas supply source is an acetylene source; when a conveying network is constructed, the rising pipeline corresponding to the oxygen source and the rising pipeline corresponding to the acetylene source are respectively laid on different sides of the boiler.
6. The concentrated gas supply system for the unit boiler construction is characterized by comprising a first gas supply station, a second gas supply station, a rising vertical pipe, a seamless steel pipe branch pipe, a gas utilization terminal and a pressure regulation and control system; the first gas supply station is at least provided with one gas supply station, and is arranged at the bottom layer of the boiler so as to intensively store a first gas medium; The second gas supply station is at least provided with one gas supply station, is arranged at the bottom layer of the boiler and keeps a safe distance from the first gas supply station so as to intensively store a second gas medium; the lifting risers are at least provided with two groups, and comprise a first lifting riser communicated with the first air supply station and a second lifting riser communicated with the second air supply station, and the first lifting riser and the second lifting riser extend along the height direction of the boiler; The seamless steel pipe branch pipes are provided with a plurality of branches which are distributed on each operation layer of the boiler and are respectively communicated with the corresponding lifting vertical pipes; The gas utilization terminals are arranged at the tail ends of the seamless steel pipe branch pipes of the working layers; The pressure regulation and control system comprises a first-stage pressure reducing valve group arranged at the outlet of the gas supply station and a second-stage pressure reducing valve group arranged at the gas utilization terminal.
7. The concentrated gas supply system for unit boiler construction according to claim 6, wherein the first gas supply station is an oxygen station, and at least two groups of parallel gas supply main pipes are arranged in the first gas supply station to be connected with a plurality of oxygen cylinder groups to realize alternate gas supply; the second gas supply station is an acetylene station, and at least two groups of gas supply main pipes connected in parallel are arranged in the second gas supply station so as to be connected with a plurality of acetylene bottle groups.
8. The concentrated gas supply system for unit boiler construction according to claim 7, wherein the acetylene station and the conveying path connected with the acetylene station are provided with a multistage tempering prevention device; the multistage tempering prevention device comprises a first stage tempering prevention device arranged at the outlet of the acetylene station, a second stage tempering prevention device arranged at the joint of the rising vertical pipe and the branch pipe, and a third stage tempering prevention device arranged at the inlet of the gas utilization terminal.
9. The utility model as in claim 6, wherein the gas terminal comprises a buffer gas container; the buffering gas storage container is provided with a plurality of valve interfaces, and the valve interfaces are connected with a gas pipe of a construction appliance through quick connectors.
10. The centralized air supply system for unit boiler construction according to claim 6, wherein the lifting vertical pipes and the seamless steel pipe branch pipes are provided with antistatic grounding devices at intervals, and the grounding resistance of the antistatic grounding devices is not higher than a preset threshold value.

Description

Concentrated air supply construction method and system for unit boiler construction Technical Field The invention relates to the technical field of auxiliary equipment for building engineering construction, in particular to a fluid conveying system for large-scale boiler installation engineering, and especially relates to a centralized air supply construction method and system suitable for high-altitude operation of a 1000MW and above ultra-supercritical unit boiler. Background Along with the upgrading of the thermal generator set to the high-capacity and high-parameter direction, particularly the popularization of 1000MW and above grade ultra-supercritical sets, the installation height of a boiler breaks through hundreds of meters generally, and in the installation peak period of the boiler, the thermal processing operation such as cutting of a large number of abutted seams, blanking of steel plates and the like is involved, the consumption of industrial fuel gas such as oxygen, acetylene and the like is extremely high, and the dependence on the continuity and stability of air supply is extremely high. Currently in the field of installation construction, the industry generally adopts a distributed gas cylinder gas supply mode, and the mode mainly transports a fully-filled gas cylinder to each layer of operation platform vertically through a construction elevator for constructors to take along with use, however, along with the increase of the height of a boiler and the improvement of the operation intensity, the defects of the traditional mode are increasingly prominent: 1. The gas cylinder consumes soon, is limited by job site vertical transportation condition, and the gas cylinder is transported to hundred meters operation layer from ground and consuming time longer, and frequent change gas cylinder not only breaks construction rhythm seriously, and need to input a large amount of manpowers to carry, leads to the cost of labor to be high. 2. A large amount of gas cylinders are stored on each layer of narrow operation platform and passageway in a dispersed manner, on one hand, limited construction space is seriously occupied, personnel passing is hindered, on the other hand, the gas cylinders have the risks of toppling over and falling at high altitude in the high altitude environment, and the dispersed storage of a plurality of gas cylinders is difficult to realize unified fireproof and explosion-proof supervision, so that the hidden danger of fire or explosion caused by leakage is large. 3. In the single bottle air feed mode, along with the pressure drop in the bottle, output pressure fluctuation is obvious, easily leads to flame unstability, directly influences cutting and welding quality, in addition, in order to avoid operation interruption, the workman is often changed the gas cylinder when remaining higher proportion gas in the bottle promptly, leads to a large amount of surplus gas unable make full use of, causes the wasting of resources and gas cost to show to increase. 4. Few projects try to replace gas cylinder transportation by adopting a simple pipeline transportation mode, but most of the prior schemes are temporary and simple, system design is not carried out aiming at the specificity of ultra-high multilayer building construction, and particularly, the problems of multi-stage pressure hierarchical regulation and control to ensure the stability of far-end pressure, pipe network path planning in complex steel structure environment to avoid formal equipment and high-temperature areas, multi-stage tempering prevention safety protection aiming at inflammable and explosive gases such as acetylene and the like exist, so that obvious defects exist, and the comprehensive requirements of large-scale unit boiler installation on high efficiency and safety are difficult to meet. Therefore, how to provide a centralized air supply device capable of remarkably improving air supply efficiency, guaranteeing high-altitude operation safety and reducing resource consumption aiming at a hundred-meter-level ultra-high multilayer boiler installation scene becomes a technical problem to be solved in the field. Disclosure of Invention Aiming at the problems of low air supply efficiency, large potential safety hazard, unstable air supply quality, lack of systematic design of the existing improved scheme and the like of the existing distributed air supply mode in the background technology, the invention provides a concentrated air supply construction method and system for unit boiler construction, and the efficient, stable and safe transportation of industrial fuel gas in an overhead operation scene is realized by centrally arranging air sources on a bottom layer, constructing a transportation network extending along the height of a boiler and setting a classification pressure regulation system. In order to achieve the above purpose, the present invention provides the following technical solutions: firstly, in the asp