A device for increasing the combustion value of boilers in power plants

Abstract

A device for increasing the combustion value of a boiler in a power plant, which relates to a boiler device in a power plant. The device adopts impingement flow, four nozzles, primary air opposing impact, double secondary air, four-corner tangential arrangement, reverse double tangential circle and air staged combustion, The four-nozzle primary air carries pulverized coal to form opposing impacts in the center of the furnace; the secondary air is divided into upper and lower winds, which are strong tuyere (10) and weak tuyere (9), both of which adopt the four-corner tangential combustion method at the center of the outlet jet. The line forms two different angles with the center line of the water wall, so that two imaginary tangential circles with the same direction but different diameters are formed in the center of the furnace. The device is equipped with four nozzles of the primary wind of the impingement flow, which collide against each other. In the impingement area, a high-concentration area where pulverized coal accumulates and a highly turbulent and oscillating area of ​​flow state will be formed. And because of the highly turbulent and oscillating nature of the impact zone, the contact between air and pulverized coal is increased, the mutual combustion effect of airflow is enhanced, and the stability and economy of combustion are improved.

Description

technical field

[0001] The invention relates to a power plant boiler device, in particular to a device for increasing the combustion value of the power plant boiler. Background technique

[0002] At present, my country's pulverized coal boilers in power stations basically adopt tangential combustion technology, W-shaped flame combustion technology and hedging combustion technology. Among them, the tangential combustion technology can be divided into four-corner tangential arrangement and four-wall tangential arrangement according to the position of the burner. There are two ways of hedging: front and rear wall horizontal symmetry and W-shaped flame symmetry. The four-corner tangential combustion rotates in the furnace to make the flame stroke longer, which is beneficial to combustion; the opposite combustion burners burn in parallel, and the independent combustion stability of a single burner is strong.

[0003] But the two methods also have the following disadvantages: ...

Examples

Embodiment

[0031] Examples of the invention are Figure 4 As shown, the combustor of the power plant boiler adopts the technology of impinging flow, four nozzles, primary air opposing impingement and double secondary quadrangular tangential arrangement.

[0032] figure 2 and image 3As shown, the specific method is as follows: the primary air flow type 3 of the four nozzles of the impingement flow is located in the center of the furnace, and the impact area is located in the center of the furnace. Using the four-corner tangential combustion technology, two imaginary tangent circles with the same rotation direction and different diameters are formed in the center of the furnace, and the smaller diameter tangent circles are close to the impact area.

[0033] figure 2 As shown, the outlet jet centerline of the primary air nozzle and the water wall centerline form an upward angle (the angle is small), so the four nozzles collide against each other with a certain upward inclination angle,...

technical field

[0001] The invention relates to a power plant boiler device, in particular to a device for increasing the combustion value of the power plant boiler. Background technique

[0002] At present, my country's pulverized coal boilers in power stations basically adopt tangential combustion technology, W-shaped flame combustion technology and hedging combustion technology. Among them, the tangential combustion technology can be divided into four-corner tangential arrangement and four-wall tangential arrangement according to the position of the burner. There are two ways of hedging: front and rear wall horizontal symmetry and W-shaped flame symmetry. The four-corner tangential combustion rotates in the furnace to make the flame stroke longer, which is beneficial to combustion; the opposite combustion burners burn in parallel, and the independent combustion stability of a single burner is strong.

[0003] But the two methods also have the following disadvantages: ...

Examples

Embodiment

[0031] Examples of the invention are Figure 4 As shown, the combustor of the power plant boiler adopts the technology of impinging flow, four nozzles, primary air opposing impingement and double secondary quadrangular tangential arrangement.

[0032] figure 2 and image 3As shown, the specific method is as follows: the primary air flow type 3 of the four nozzles of the impingement flow is located in the center of the furnace, and the impact area is located in the center of the furnace. Using the four-corner tangential combustion technology, two imaginary tangent circles with the same rotation direction and different diameters are formed in the center of the furnace, and the smaller diameter tangent circles are close to the impact area.

[0033] figure 2 As shown, the outlet jet centerline of the primary air nozzle and the water wall centerline form an upward angle (the angle is small), so the four nozzles collide against each other with a certain upward inclination angle,...

Images