阅读说明：本技术 一种燃煤锅炉新型燃烧系统 (Novel combustion system of coal-fired boiler ) 是由 王苗苗 王昕� 王皓堃 王浩晨 王芝岭 王济塘 于 2020-08-11 设计创作，主要内容包括：本发明涉及一种燃煤锅炉新型燃烧系统,包括锅炉以及与锅炉相连的蒸汽出汽管和烟道；所述烟道与烟囱连接,所述烟道和烟囱之间的管道上设有热空气发生器、水蒸汽发生器、鼓风机、烟气处理装置和引风机；所述热空气发生器分别与鼓风机和锅炉的进风管连接；所述水蒸汽发生器与锅炉的进风管连接。通过在烟道与烟囱之间的管道上设置水蒸汽发生器利用烟气的余热将水由液态转换为汽态,并将水蒸汽与锅炉的进风管连接,从而增加锅炉内的水蒸汽的含量,通过水蒸汽吸附空气中的氧分子,增加锅炉内的含氧量,保证燃料燃烧充分,从而降低了烟气中含氧量,节约能源；通过利用烟气的余热将进入锅炉内的空气进行加热,减少锅炉的热量消耗。(The invention relates to a novel combustion system of a coal-fired boiler, which comprises a boiler, a steam outlet pipe and a flue, wherein the steam outlet pipe and the flue are connected with the boiler; the flue is connected with the chimney, and a pipeline between the flue and the chimney is provided with a hot air generator, a water vapor generator, a blower, a flue gas treatment device and an induced draft fan; the hot air generator is respectively connected with the air blower and an air inlet pipe of the boiler; and the water vapor generator is connected with an air inlet pipe of the boiler. The water vapor generator is arranged on the pipeline between the flue and the chimney, the water is converted into a vapor state from a liquid state by using the waste heat of the flue gas, and the water vapor is connected with the air inlet pipe of the boiler, so that the content of the water vapor in the boiler is increased, oxygen molecules in the air are adsorbed by the water vapor, the oxygen content in the boiler is increased, the full combustion of fuel is ensured, the oxygen content in the flue gas is reduced, and the energy is saved; the waste heat of the flue gas is utilized to heat the air entering the boiler, so that the heat consumption of the boiler is reduced.)

1. A novel combustion system of a coal-fired boiler is characterized by comprising a boiler (1), a steam outlet pipe (2) and a flue (3), wherein the steam outlet pipe and the flue are connected with the boiler (1);

the flue (3) is connected with a chimney (10), and a pipeline between the flue (3) and the chimney (10) is provided with a hot air generator (4), a water vapor generator (5), an air blower (7), a flue gas treatment device (8) and an induced draft fan (9);

the hot air generator (4) is respectively connected with the air blower (7) and an air inlet pipe (11) of the boiler (1);

the water vapor generator (5) is connected with an air inlet pipe (11) of the boiler (1).

2. The novel combustion system of a coal-fired boiler as recited in claim 1, characterized in that the steam outlet pipe (2) is connected with the air inlet pipe (11) of the boiler (1) through a steam return pipe (12).

3. The novel combustion system of a coal-fired boiler according to claim 1, characterized in that the number of the blowers (7) is 1, and the power of the blowers (7) is 5.5kW to 22 kW.

4. The novel combustion system of the coal-fired boiler as recited in claim 3, wherein the pressure of the blower (7) is 7300 Kpa to 4800 Kpa.

5. The novel combustion system of the coal-fired boiler as recited in claim 1, wherein the motor power of the induced draft fan (9) is 11-37 kW.

6. The novel combustion system of the coal-fired boiler according to claim 5, wherein the flow rate of the induced draft fan is 9600-15000 m³/h。

7. The novel combustion system of a coal-fired boiler according to claim 1, characterized in that the flue gas treatment device (8) comprises a denitrifier (8-1), a deaminator (8-2), a wet electric dust remover (8-3) and a denitrifier (8-4) which are connected.

8. The new combustion system of coal-fired boiler according to claim 1, characterized in that the water vapor generator (5) is connected with an automatic water replenishing device (6).

9. The new combustion system of a coal-fired boiler according to claim 1, characterized in that the water vapor generator (5) is arranged outside the flue (3).

Technical Field

The invention relates to the technical field of industrial boilers, in particular to a novel combustion system of a coal-fired boiler.

Background

The main working principle of the boiler is that heat energy released after fuel combustion or waste heat in industrial production is transferred to water in a container, so that the water reaches the required temperature or steam with a certain pressure.

The combustion condition of the boiler has important influence on the heat economy, safety and environmental protection of the whole system, if the combustion condition is poor, the boiler efficiency is low, simultaneously, the carbon and oxygen content in fly ash are high, the abrasion of each heating surface of a hearth and the mechanical abrasion of an SCR catalyst can be aggravated, and high carbon-containing combustible materials adhered to the SCR catalyst, an air preheater corrugated plate and an electrostatic dust collector polar plate can be subjected to secondary combustion to damage equipment when the high-load operation is carried out. Therefore, in order to ensure a good combustion effect of the boiler in a modern coal-fired power plant, especially under the working condition of low load operation of a unit, the air intake of the boiler is usually increased, and a series of means for adjusting the steam temperature are supplemented to ensure the combustion efficiency and the steam temperature, so that although the combustion condition of the boiler can be improved to a certain extent, the air intake of the boiler and the carbon and oxygen contents of the flue gas at the outlet of a hearth are increased, the generation concentration of nitrogen oxides during the combustion of the boiler is greatly increased, the whole flue gas amount is increased, and the power consumption of a fan and the smoke discharge loss are increased. Therefore, the combustion mode is essentially a combustion mode with high carbon, high oxygen, high nitrogen, low pressure, large air intake and large air inducing discharge, and the energy consumption is increased.

Disclosure of Invention

The invention provides a novel combustion system of a coal-fired boiler, aiming at the problems of insufficient combustion of the boiler and large power consumption of a fan, which cause resource waste in the prior art.

The technical scheme for solving the technical problems is as follows: a novel combustion system of a coal-fired boiler comprises a boiler, a steam outlet pipe and a flue, wherein the steam outlet pipe and the flue are connected with the boiler;

the flue is connected with the chimney, and a pipeline between the flue and the chimney is provided with a hot air generator, a water vapor generator, a blower, a flue gas treatment device and an induced draft fan;

the hot air generator is respectively connected with the air blower and an air inlet pipe of the boiler;

and the water vapor generator is connected with an air inlet pipe of the boiler.

The invention has the beneficial effects that: according to the boiler, the water vapor generator is arranged on the pipeline between the flue and the chimney, water is converted from a liquid state into a gaseous state by using the waste heat of the flue gas, and the water vapor is connected with the air inlet pipe of the boiler, so that the content of the water vapor in the boiler is increased, oxygen molecules in the air are adsorbed by the water vapor, the oxygen content in the boiler is increased, the fuel is ensured to be fully combusted, and the carbon content, the oxygen content and the nitrogen content in the flue gas are reduced; the hot air generator is arranged on the flue, and natural air entering the boiler is heated by using the waste heat of the flue gas to be changed into hot air, so that the heat consumption of the boiler is reduced, and the energy is saved. The invention makes the coal bed in the boiler burn fully by means of high wind pressure and low wind quantity, and realizes the purpose of reducing emission.

On the basis of the technical scheme, in order to achieve the convenience of use and the stability of equipment, the invention can also make the following improvements on the technical scheme:

furthermore, the steam outlet pipe is connected with an air inlet pipe of the boiler through a steam return pipe.

The beneficial effect of adopting the further technical scheme is that: the steam return pipe is connected with the air inlet pipe of the boiler, part of steam is supplemented into the combustion area of the boiler, and the oxygen content in the boiler is increased by attaching the steam to the oxygen in the air, so that the fuel is combusted more fully, and the energy is saved.

Further, the number of the air blowers is 1, and the power of the air blowers is 5.5 kW-22 kW.

The beneficial effect of adopting the further technical scheme is that: the quantity and the power of the air blowers are set, so that the air quantity entering the boiler is ensured, the fuel is combusted more fully, and the resource waste is reduced.

Further, the pressure of the blower is 7300-4800 Kpa.

The beneficial effect of adopting the further technical scheme is that: the air pressure degree of a combustion area of the boiler is increased as much as possible by changing low air pressure of the air blower into high air pressure under the condition of ensuring negative pressure during the operation of the boiler, so that the pressure required by the combustion of fuel in the boiler is ensured, the fuel is ensured to be fully combusted, and the carbon content, the nitrogen content and the oxygen content in fly ash are reduced.

Further, the motor power of draught fan is 11 ~ 37 kW.

The beneficial effect of adopting the further technical scheme is that: because the flue gas volume that makes the boiler exhaust after the fuel fully burns in the boiler reduces, consequently reduced the power requirement to the draught fan, practiced thrift the energy, reduced the emission.

Further, the flow of the induced draft fan is 9600-15000 m³/h。

The beneficial effect of adopting the further technical scheme is that: the amount of the discharged flue gas is reduced due to the fact that fuel in the boiler is fully combusted, the flow requirement on the draught fan is reduced, the draught fan with low flow can guarantee the emission requirement of the flue gas, meanwhile, electric energy is saved by about 85%, the fire coal is saved by more than 40%, and the exhaust amount of the flue gas is reduced by about 90%.

Further, the flue gas treatment device comprises a denitrator, a deamination device, a wet electric dust remover and a denitrator which are connected.

The beneficial effect of adopting the further technical scheme is that: harmful ingredients in the flue gas can be eliminated by arranging the denitrifier, the deaminator and the like, so that the emission requirement is met.

Further, the water vapor generator is connected with an automatic water replenishing device.

The beneficial effect of adopting the further technical scheme is that: through being connected water vapor generator and automatic water supply device, can guarantee that sufficient steam supplyes to the boiler combustion area in, guarantee the abundant burning of boiler fuel.

Further, the water vapor generator is disposed outside the flue.

The beneficial effect of adopting the further technical scheme is that: the water in the water vapor generator and the high-temperature flue gas in the flue can exchange heat to generate steam by wrapping the water vapor generator outside the flue, so that the heating time is shortened.

Drawings

FIG. 1 is a schematic view of the novel combustion system of a coal-fired boiler of the present invention.

The reference numbers are recorded as follows: the device comprises a boiler 1, a steam outlet pipe 2, a flue 3, a hot air generator 4, a water vapor generator 5, an automatic water replenishing device 6, an air blower 7, a flue gas treatment device 8, a denitrifier 8-1, a deamination device 8-2, a wet electric dust remover 8-3, a denitrifier 8-4, an induced draft fan 9, a chimney 10, an air inlet pipe 11 and a steam return pipe 12.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

A novel combustion system of a coal-fired boiler (see figure 1) comprises a boiler 1, a steam outlet pipe 2 and a flue 3 which are connected with the boiler 1;

the flue 3 is connected with a chimney 10, and a pipeline between the flue 3 and the chimney 10 is provided with a hot air generator 4, a water vapor generator 5, a flue gas treatment device 8 and an induced draft fan 9;

the hot air generator 4 is respectively connected with the air blower 7 and an air inlet pipe 11 of the boiler 1;

the water vapor generator 5 is connected to an air inlet pipe 11 of the boiler 1.

The steam outlet pipe 2 is connected with an air inlet pipe 11 of the boiler 1 through a steam return pipe 12. A steam content detection device is arranged in the boiler 1, and when the content of water vapor in the boiler 1 exceeds 10%, the steam return pipe 12 can be closed, so that the proportion of fuel and oxygen content in the boiler 1 is ensured to reach an optimal value, and the carbon content, nitrogen content and oxygen content in smoke are reduced.