CN211372385U

CN211372385U - Secondary high-temperature secondary high-pressure pulverized coal boiler

Info

Publication number: CN211372385U
Application number: CN201921429763.2U
Authority: CN
Inventors: 何雁飞; 薛金彪; 徐乐斌; 时扶芃; 顾之震; 宋成; 陈益增; 薛志芳
Original assignee: Wuxi Huaguang Environment and Energy Group Co Ltd
Current assignee: Wuxi Huaguang Environment and Energy Group Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-08-28
Anticipated expiration: 2029-08-30

Abstract

The utility model relates to a boiler technical field specifically is a inferior high temperature time high pressure pulverized coal boiler, and it can satisfy the requirement of combustor structure and water-cooling wall structure, and it includes the boiler body, be provided with combustor and water-cooling wall on the boiler body, a serial communication port, the combustor includes four groups and arranges in furnace's four corners, supreme five layers of once wind spouts, seven layers of overgrate air spouts, three-layer gas spouts, four layers of SOFA spouts of setting up are down followed to the combustor, the pipe diameter phi of water-cooling wall is 75-78mm, and the pitch is 90-95 mm.

Description

Secondary high-temperature secondary high-pressure pulverized coal boiler

Technical Field

The utility model relates to a boiler technical field specifically is a inferior high temperature time high pressure pulverized coal fired boiler.

Background

The energy resource of China is characterized by rich coal, lack of oil and little gas. This means that coal will be the leading factor of our energy structure both at present and for a considerable period of time in the future. However, the current state of the coal-fired industrial boiler in China is not optimistic.

Firstly, the pollution is serious. The data show that in 2010, the coal of the Chinese industrial boiler discharges about 1000 million tons of sulfur dioxide, about 200 million tons of nitrogen oxides, about 100 million tons of dust and about 9000 million tons of waste residues, and is the second largest coal smoke type pollution source next to coal-fired power generation in China. However, in the chinese industrial boiler, more than 85% of the total number and the total capacity are coal-fired industrial boilers.

Secondly, the energy efficiency level is low. The design efficiency and the operation thermal efficiency of the Chinese coal-fired industrial boiler are generally 72-80%, the actual operation thermal efficiency is mostly 60-65%, and the difference from the international level is 15-20%.

And thirdly, the automation level is low. Most coal-fired boilers are still manually operated by workers, the operating environment is severe, and the actual operation efficiency is poor.

The twelve-five energy-saving emission-reduction target indicates that by 2015, the total energy consumption of the national ten thousand yuan domestic production is reduced to 0.869 ton of standard coal (calculated according to the 2005 price), which is 16% lower than 1.034 ton of standard coal in 2010 and 32% lower than 1.276 ton of standard coal in 2005. If the overall thermal efficiency of an industrial boiler is improved from 65% to 80%, more than 1.3 million tons of coal can be saved each year. The national institute of energy improvement and development committee indicates that the korean science of the long term has great potential for energy conservation in industrial boilers as "the joint business of china".

At present, 670t/h times high-temperature and sub-high-pressure pulverized coal mixed gas fired boilers independently researched and developed by the company, large pulverized coal boilers with sub-high-pressure parameters are initiated at home, and due to the fact that gas is doped, the existing combustor structure cannot meet the product requirements of the project, and a water-cooled wall system cannot be applied to the existing structure.

SUMMERY OF THE UTILITY MODEL

In order to solve 670t/h time high temperature time high pressure buggy and mix the problem that burns the unsatisfied requirement of gas boiler burner structure and water-cooled wall structure, the utility model provides a time high temperature time high pressure pulverized coal boiler, it can satisfy the requirement of burner structure and water-cooled wall structure.

The technical scheme is as follows: the utility model provides a inferior high temperature time high pressure pulverized coal boiler, its includes the boiler body, be provided with combustor and water-cooling wall on the boiler body, its characterized in that, the combustor includes four groups and arranges in the four corners of furnace, the combustor is from supreme five layers of wind spouts, seven layers of overgrate air spouts, three-layer gas spouts, four layers of SOFA spouts of setting up down, the pipe diameter phi of water-cooling wall is 75-78mm, and the pitch is 90-95 mm.

The primary air nozzle and the secondary air nozzle form a main burner, and the diameter of an imaginary tangent circle of the main burner is 670 mm;

the burner adopts a shutter thick-thin burner;

the boiler body is also provided with a steam drum, the inner diameter phi of the steam drum is 1800mm, and three parallel cyclone separators are arranged inside the steam drum from left to right;

the primary air nozzle on the second layer from the bottom to the top of the lower end is provided with micro-oil ignition equipment;

the lower part of the steam drum is connected with a downcomer, the bottom of the downcomer is lower than the lower header of the water-cooled wall, and the bottom of the downcomer is connected with the lower header of the water-cooled wall through at least two dispersing downcomers.

Adopt the utility model discloses a behind the structure, the structure of rational arrangement combustor can mix the gas among the process systems to increased the pipe diameter and the pitch of water-cooling wall, satisfied combustor and water-cooling wall requirement.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a burner configuration;

FIG. 3 is a schematic view of a drum structure;

FIG. 4 is a schematic view of a lower header structure of a waterwall.

Detailed Description

Referring to fig. 1, 2, 3 and 4, the secondary high-temperature and secondary high-pressure pulverized coal boiler comprises a boiler body, wherein a combustor 1 and water-cooling walls 2 are arranged on the boiler body, the combustor 1 comprises four groups and is arranged at four corners of a hearth 3, five layers of 20 primary air nozzles 4, seven layers of 28 secondary air nozzles 5, three layers of 12 gas nozzles 6 and four layers of 16 SOFA nozzles 7 are arranged on the combustor 1 from bottom to top, the pipe diameter phi of the water-cooling wall 2 is 76mm, the pitch is 94.5mm, the original water-cooling wall is a conventional pipe with phi of 60 mm, and the pitch is 80mm, so that the water-cooling boiler meets the requirement of water circulation. The primary air nozzle 4 and the secondary air nozzle 5 form a main burner, and the diameter of an imaginary tangent circle of the main burner is 670 mm; the burner adopts a shutter thick-thin burner; the primary air nozzle 4 on the second layer from the bottom to the top is provided with a tiny oil ignition device.

The boiler body is also provided with a steam drum 8, the inner diameter phi of the steam drum 8 is 1800mm, and three parallel cyclone separators 12 are arranged inside the steam drum 8 from left to right, so that the requirement of the large-capacity low-parameter steam-water separation quantity can be met.

The lower part of the steam drum 8 is connected with a downcomer 9, the bottom of the downcomer 9 is lower than a lower header 10 of the water-cooled wall, and the bottom of the downcomer 9 is connected with the lower header 10 of the water-cooled wall through at least two dispersed downcomers 11, so that impurities can be prevented from entering the water-cooled wall of the hearth through the downcomers.

The company adopts a plurality of targeted measures in the design of the boiler, ensures the stable operation of the boiler under various working conditions, and achieves various performance parameters.

Claims

1. The utility model provides a inferior high temperature time high pressure pulverized coal boiler, its includes the boiler body, be provided with combustor and water-cooling wall on the boiler body, its characterized in that, the combustor includes four groups and arranges in the four corners of furnace, the combustor is from supreme five layers of wind spouts, seven layers of overgrate air spouts, three-layer gas spouts, four layers of SOFA spouts of setting up down, the pipe diameter phi of water-cooling wall is 75-78mm, and the pitch is 90-95 mm.

2. The pulverized coal boiler of claim 1, wherein the primary air nozzle and the secondary air nozzle form a main burner, and the diameter of an imaginary tangent circle of the main burner is 670 mm.

3. The sub-high temperature and sub-high pressure pulverized coal fired boiler according to claim 1, wherein the burner is a louver rich burner.

4. The secondary high temperature and secondary high pressure pulverized coal fired boiler according to claim 1, wherein the primary air nozzle of the second to last layer at the lower end is provided with a tiny oil ignition device.

5. The secondary high-temperature secondary high-pressure pulverized coal fired boiler according to claim 1, wherein a steam drum is further arranged on the boiler body, the inner diameter phi of the steam drum is 1800mm, and three parallel cyclone separators are arranged inside the steam drum from left to right.

6. A sub-high temperature and sub-high pressure pulverized coal fired boiler as claimed in claim 5, wherein the lower part of the steam drum is connected with a downcomer, the bottom of the downcomer is lower than the lower header of the water wall, and the bottom of the downcomer is connected with the lower header of the water wall through at least two dispersion downcomers.