CN215723300U

CN215723300U - Pulverized coal fired boiler heating system

Info

Publication number: CN215723300U
Application number: CN202120877799.8U
Authority: CN
Inventors: 陈玮; 罗向龙; 梁颖宗; 陈健勇; 杨智; 陈颖
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2022-02-01
Anticipated expiration: 2031-04-27

Abstract

The utility model discloses a pulverized coal boiler heat supply system which comprises a hearth and a cold ash hopper, wherein the cold ash hopper is arranged at the lower end of the hearth, the left and right outer side walls of the hearth are respectively provided with a high-voltage positive electrode and a high-voltage negative electrode, and the left and right inner side walls of the hearth are respectively provided with a vibration plate. The utility model combines the electric field enhanced heat transfer and dust removal technologies, can effectively improve the boiler efficiency, reduce the dust deposition on the cooling wall surface of the hearth and ensure the high-efficiency and safe operation of the boiler.

Description

Pulverized coal fired boiler heating system

Technical Field

The utility model relates to the field of boiler structures, in particular to a pulverized coal boiler heat supply system.

Background

China is a large coal consumption country, and the coal-fired power generation amount accounts for more than 70% of the total power generation amount of China. At present, steam Rankine cycle is widely adopted for coal-fired power generation, but the power generation efficiency is limited by physical properties of water, phase-change fire loss, materials and the like, so that the power generation efficiency is limited. In contrast, due to supercritical carbon dioxide (SCO)₂) High Brayton cycle efficiency, compact system structure, environmental friendliness, SCO₂Coal-fired power generation is becoming a research hotspot. But the cooling wall and the reheating wall of the existing boiler are generally arranged in a boiler furnace, because the smoke temperature in the furnace is extremely high, and the supercritical fluid in the pipe has small heat exchange coefficient with the avoidance, the pipe is easy to overheat, and in addition, the dust is easy to be deposited in the boiler furnace, thereby influencing the working efficiency of the boiler.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a pulverized coal boiler heating system which improves the working efficiency of a boiler through electric field enhanced heat transfer and high-efficiency dust removal of a hearth.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a pulverized coal boiler heating system, includes furnace and cold ash bucket, cold ash bucket set up in the lower extreme of furnace, the left and right lateral wall of furnace is provided with high-pressure positive electrode and high-pressure negative electrode respectively, the left and right lateral wall of furnace is provided with the vibrations board respectively.

Furthermore, a water-cooled wall and a reheating wall are arranged in the hearth, and the water-cooled wall is positioned below the reheating wall.

Furthermore, the furnace also comprises a flue, and the flue is communicated with the upper end of the hearth. And a high-temperature superheater, a low-temperature superheater, a reheater, an economizer, an air preheater and a flue gas absorber are sequentially arranged in the flue along the advancing direction of the flue gas, wherein the air preheater and the flue gas absorber are arranged at the outlet end of the flue.

The utility model has the beneficial effects that: the boiler heating system of this design adopts to produce highly compressed electrode and places in furnace's both sides, utilize high voltage direct current power to produce the electric field in making furnace, effect through the electric field, can arouse supercritical fluid particle to take place the disturbance, form little swirl, promote the heat transfer with the heat transfer of wall to the mainstream, intraductal convection current coefficient can increase several times, and simultaneously, because the electrostatic interaction makes the cigarette ash in the furnace can toward the gathering of electrode both ends, this design is through arranging two vibrations boards in furnace, can drop the dust shake that adsorbs on the board in the cold ash fill. Therefore, the utility model can effectively improve the boiler efficiency, reduce the dust deposition on the cooling wall surface of the hearth and ensure the high-efficiency and safe operation of the boiler by combining the electric field enhanced heat transfer and dust removal technologies.

Drawings

Figure 1 is a schematic structural view of the present invention,

fig. 2 and fig. 3 are schematic diagrams of the electric field of the furnace in the cross section and the electric field of the furnace in the longitudinal section respectively.

Detailed Description

The utility model will be further described with reference to the accompanying drawings.

As shown in fig. 1, a pulverized coal boiler heating system, includes furnace, cold ash bucket and flue, cold ash bucket set up in the lower extreme of furnace, the flue intercommunication the upper end of furnace, be equipped with water-cooling wall 11 and reheating wall 12 in the furnace, water-cooling wall 11 is located reheating wall 12 below, install high temperature over heater 13, low temperature over heater 14, re-heater 15, economizer 16, air heater 17 and flue gas absorber 18 in proper order along flue gas advancing direction in the flue, air heater 17 and flue gas absorber 18 install the exit end of flue. The left and right outer side walls of the hearth are respectively provided with a high-voltage positive electrode 21 and a high-voltage negative electrode 22, and the left and right inner side walls of the hearth are respectively provided with a vibration plate 3.

Because the cooling wall and the reheating wall of the common boiler are arranged in the hearth, the overheating of the tube is easily caused because the smoke temperature in the hearth is extremely high and the supercritical fluid in the tube has small heat exchange coefficient with the furnace. After the electric field is added in the hearth, as shown in fig. 2 and 3, the direction of the electric field is parallel to the ground, the electrodes generating high voltage are placed at two ends of the hearth, and the high-voltage direct-current power supply is utilized to generate the electric field in the hearth. Under the action of an electric field, supercritical fluid particles can be disturbed to form small vortexes, heat on the wall surface is transferred to the main flow to promote heat transfer, and the convective heat transfer coefficient in the pipe can be increased by multiple times. Meanwhile, due to the electrostatic action, the soot in the hearth can be gathered towards the two ends of the electrodes. According to the utility model, two vibration plates are arranged in the hearth, so that dust adsorbed on the vibration plates can shake and fall into the cold dust hopper. Therefore, the utility model can effectively improve the boiler efficiency, reduce the dust deposition on the cooling wall surface of the hearth and ensure the high-efficiency and safe operation of the boiler by combining the electric field enhanced heat transfer and dust removal technologies.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made in the claims and the description of the present invention are within the scope of the present invention.

Claims

1. The pulverized coal boiler heating system is characterized by comprising a hearth and a cold ash hopper, wherein the cold ash hopper is arranged at the lower end of the hearth, the left and right outer side walls of the hearth are respectively provided with a high-voltage positive electrode and a high-voltage negative electrode, and the left and right inner side walls of the hearth are respectively provided with a vibration plate.

2. The pulverized coal fired boiler heating system according to claim 1, wherein a water-cooled wall and a reheating wall are arranged in the furnace, and the water-cooled wall is located below the reheating wall.

3. The pulverized coal fired boiler heating system according to claim 1, further comprising a flue, wherein the flue is communicated with the upper end of the furnace.

4. The pulverized coal fired boiler heating system according to claim 3, wherein a high temperature superheater, a low temperature superheater, a reheater and an economizer are sequentially installed in the flue along the forward direction of the flue gas.

5. A pulverized coal fired boiler heating system as claimed in claim 3 or 4, characterized in that the outlet end of the flue is equipped with an air preheater and a flue gas absorber.