CN-122015067-A - Gas through-flow steam boiler

Abstract

The application discloses a gas through-flow steam boiler which comprises an upper header, a lower header and a water pipe group communicated with the upper header and the lower header, and is characterized in that the water pipe group comprises flame root cooling pipes, the flame root cooling pipes are positioned at the outer sides of the water pipe group, the inner sides of the flame root cooling pipes are combustion areas for flame combustion, gaps are reserved between adjacent flame root cooling pipes, guide plates connected with the flame root cooling pipes are arranged at the outer sides of the gaps, the guide plates are provided with a plurality of air holes for combustible gas to pass through, gas channels for the combustible gas to flow are formed between the guide plates and the pipe walls of the adjacent flame root cooling pipes, and flames can be effectively controlled by ignition after the combustible gas is introduced into the gas channels, so that not only is the generation of nitrogen oxides reduced, but also the reasonable utilization of flame heat is carried out, the steam generation quantity is improved, and the production efficiency is improved.

Inventors

• GUO LEI
• YI BAOKUI
• LV HAO
• HAO YUGUO
• JI YANLI
• JIANG JIANPING
• JIANG LAIJUN
• REN FENGGUI

Assignees

• 山东大西热能设备有限公司

Dates

Publication Date

20260512

Application Date

20260130

Claims (14)

1. 1. The gas through-flow steam boiler comprises an upper header, a lower header and a water pipe group communicated with the upper header and the lower header, and is characterized in that the water pipe group comprises a flame root cooling pipe, the flame root cooling pipe is positioned at the outer side of the water pipe group, and the inner side of the flame root cooling pipe is a combustion zone; a gap exists between the adjacent flame root cooling pipes, a guide plate connected with the flame root cooling pipes is arranged outside the gap, and is provided with a plurality of air holes for the combustible gas to pass through; a gas channel for combustible gas to flow is formed between the guide plate and the pipe wall of the adjacent flame root cooling pipe; On the horizontal cross section of the gas channel, the connecting line between the nearest ends of the adjacent flame root cooling pipes is set as a dividing line, the part of the gas channel from the guide plate to the dividing line is a P1 section, the length of the connecting line between the adjacent flame root cooling pipes in the P1 section is gradually reduced from outside to inside, the part of the dividing line to the edge of the combustion zone is a P2 section, and the length of the connecting line between the adjacent flame root cooling pipes in the P2 section is gradually increased from outside to inside.
2. 2. A gas-fired steam boiler according to claim 1, wherein two rows of said root-flame cooling tubes are disposed opposite each other along the outer edges of said water tube sets, respectively, and wherein the combustible gas enters along said gas passage to form two sets of flames which are burned relatively.
3. 3. A gas-fired steam boiler according to claim 1, wherein two rows of said root-flame cooling tubes are vertically disposed along two adjacent outer edges of said water tube set, and wherein the combustible gas enters along said gas passage to form two sets of "L" shaped flames upon ignition.
4. 4. A gas-fired through-flow steam boiler according to claim 2 or 3, wherein the water tube set further comprises a furnace water tube arranged in the junction region of the two sets of flames for absorbing the temperature of the flame junction region to bring the flame temperature below 1500 ℃.
5. 5. A gas-fired steam boiler according to claim 1, wherein the water tube set further comprises membrane wall tubes, the membrane wall tubes are distributed outside the water tube set, a convection zone communicating with the combustion zone is formed inside the membrane wall tubes, and convection tubes are arranged in the convection zone.
6. 6. A gas-fired steam boiler according to claim 1, characterised in that the distance d from the deflector to the dividing line is in the range 0<d-r.
7. 7. A gas-fired steam boiler according to claim 6, wherein the projected area of the P2 section on the horizontal section of the gas passage is S2, the projected area of the P1 section on the horizontal section of the gas passage is S1, and when the adjacent flame root cooling pipes are relatively fixed, both S1 and S2 increase with an increase in d.
8. 8. The gas-fired steam boiler of claim 1, wherein the deflector is any one of a flat plate, an arc, or a V-bend arrangement.
9. 9. A gas-fired steam boiler according to claim 8, wherein the air holes are provided near the junction of the deflector and the flame root cooling tube.
10. 10. The gas-fired steam boiler according to claim 8, wherein the air hole is provided at an intermediate position of the deflector.
11. 11. A gas-fired through-flow steam boiler according to claim 9 or 10, wherein the air holes are rectangular, and the length direction of the air holes is perpendicular to the axis of the flame root cooling pipe.
12. 12. A gas through-flow steam boiler according to claim 9 or 10, wherein the air holes are arranged in a circular hole structure.
13. 13. The gas-fired steam boiler according to claim 8, wherein when the deflector is arranged in a circular arc or V-shaped bending manner, the middle part of the deflector is bent and protruded towards the outer side direction of the flame root cooling pipe.
14. 14. The gas-fired steam boiler according to claim 8, wherein when the deflector is arranged in a circular arc or V-shaped bending manner, the middle part of the deflector is bent and protruded toward the inner side of the flame root cooling pipe.

Description

Gas through-flow steam boiler Technical Field The invention belongs to the field of steam boilers, and particularly relates to a gas through-flow steam boiler. Background The cross-flow steam boiler is one type of steam boilers, and has the advantages of small volume of a boiler body, high gas production speed, higher fuel combustion efficiency, relatively compact equipment occupation area and the like, so that the cross-flow steam boiler becomes one of the development directions of the steam boilers in recent years; The traditional gas through-flow steam boiler is generally composed of an upper header, a lower header and a water pipe group communicated with the upper header and the lower header, flames enter the water pipe group in a unidirectional mode to directly burn in the water pipe group area so as to heat water bodies in the water pipe group, and generated steam-water mixtures are separated through a gas-liquid separator communicated with the upper header to obtain qualified steam for subsequent use. The traditional gas through-flow steam boiler has the advantages that the flame directly burns and heats a water pipe or furnace jacket water, the flame is free to burn, on one hand, the flame stability is poor, the flame with low air-fuel ratio is incomplete due to oxygen-deficient combustion, partial gas is not fully combusted, the content of carbon monoxide in flue gas is increased, the emission is overproof, meanwhile, the gas waste is caused, the consumption of the gas is increased, on the other hand, the flame is easily influenced by the flow velocity of the introduced gas, the flame distribution in each area is disturbed, the temperature in the central area of the flame is increased, the generation amount of nitrogen oxides is increased, the temperature in the central area of the flame cannot be regulated and controlled, the conventional solution is to increase the excessive air to participate in combustion, cool the flame temperature and control the generation of nitrogen oxides, but the problems that the gas cannot be fully combusted and the carbon monoxide is increased due to the reduction of the flame combustion temperature are affected. The traditional steam boiler has the defects of high air-fuel ratio energy consumption and low heat utilization rate, and influences the steam generation efficiency of the boiler. Disclosure of Invention In order to solve the problems, the invention provides a gas through-flow steam boiler, which is provided with two groups of flames which are burnt relatively or in an L shape, so that the flames are burnt in a crossing way in a specific area, and the problem that the carbon monoxide at the tail part of the flames is insufficiently burnt under the condition of low air-fuel ratio by single-side combustion, thereby leading to the rise of the carbon monoxide emission content in tail gas is solved; Meanwhile, a special gas channel is formed by arranging the flame root cooling pipe and the guide plate, the combustible gas is compressed through the P1 section after being introduced, the influence of the flow rate of the introduced gas on the gas in the gas channel can be effectively weakened, the ignited flame root can be controlled to be fixed at the P2 section through the expansion of the P2 section, the position of a flame intersection area can be effectively determined, and a hearth water pipe is arranged at the intersection combustion position to absorb the heat of the area, so that the increase of the nitrogen oxide generation amount caused by continuous high temperature is avoided. The gas through-flow steam boiler comprises an upper header, a lower header and a water pipe group communicated with the upper header and the lower header, wherein the water pipe group comprises a flame root cooling pipe, the flame root cooling pipe is positioned at the outer side of the water pipe group, and the inner side of the flame root cooling pipe is a combustion zone for flame combustion; A gap exists between the adjacent flame root cooling pipes, a guide plate connected with the flame root cooling pipes is arranged at the outer side of the gap, and a plurality of air holes are formed in the guide plate and used for the combustible gas to pass through; A gas channel for combustible gas to flow is formed between the guide plate and the pipe wall of the adjacent flame root cooling pipe; On the horizontal cross section of the gas channel, the nearest connecting line of the adjacent flame root cooling pipes is set as a boundary, the part of the gas channel from the guide plate to the boundary is a P1 section, the length of the connecting line of the pipe walls of the adjacent flame root cooling pipes in the P1 section is gradually reduced from outside to inside, the part of the boundary to the edge of the combustion zone is a P2 section, and the length of the connecting line of the pipe walls of the adjacent flame root cooling pipes in the P2 section is gradually increased fro