阅读说明：本技术 烟气再循环辅助分级配风锅炉 (Flue gas recirculation auxiliary grading air distribution boiler ) 是由 李宁 于振海 王丽敏 于 2019-10-08 设计创作，主要内容包括：本发明涉及一种烟气再循环辅助分级配风锅炉,其特征在于：烟气再循环单元包括第一再循环管、第二再循环管、烟气分配器及再循环风机,第一再循环管一端连接至出烟管,另一端连接至再循环风机,再循环风机端部连接至第二再循环管,第二再循环管的烟气通过烟气分配器进入炉排多风室；空气送气单元包括风管及送风机,风管连接至炉排多风室,空气通过送风机抽入风管后进入到炉排多风室与再循环烟气混合。本发明设计科学合理,烟气与空气混合均匀,能够将焓值较高的烟气进行循环利用,节约能源；同时能够对炉膛内的燃烧工况进行实时监测,可实时调节炉膛进风量与烟风比,改善炉膛燃烧工况,降低NOx浓度,实现环保效果。(The invention relates to a flue gas recirculation auxiliary grading air distribution boiler, which is characterized in that: the flue gas recirculation unit comprises a first recirculation pipe, a second recirculation pipe, a flue gas distributor and a recirculation fan, wherein one end of the first recirculation pipe is connected to the flue gas outlet pipe, the other end of the first recirculation pipe is connected to the recirculation fan, the end part of the recirculation fan is connected to the second recirculation pipe, and the flue gas of the second recirculation pipe enters the grate multi-air chamber through the flue gas distributor; the air supply unit comprises an air pipe and a blower, the air pipe is connected to the grate multi-air chamber, and air is pumped into the air pipe through the blower and then enters the grate multi-air chamber to be mixed with the recirculated flue gas. The invention has scientific and reasonable design, the flue gas and the air are uniformly mixed, the flue gas with higher enthalpy can be recycled, and the energy is saved; meanwhile, the combustion working condition in the hearth can be monitored in real time, the air inlet volume and the smoke-air ratio of the hearth can be adjusted in real time, the combustion working condition of the hearth is improved, the concentration of NOx is reduced, and the environment-friendly effect is realized.)

1. the utility model provides a flue gas recirculation assists hierarchical air distribution boiler, includes the traveling grate stoker, the left end of traveling grate stoker is connected the coal scuttle, the below of traveling grate stoker sets up the many wind rooms of grate, and the many wind rooms of grate communicate to the furnace of traveling grate stoker in, be located the economizer on the boiler barrel of traveling grate stoker and be connected with out the tobacco pipe, its characterized in that: the flue gas recycling unit comprises a first recycling pipe, a second recycling pipe, a flue gas distributor and a recycling fan, one end of the first recycling pipe is connected to the smoke outlet pipe, the other end of the first recycling pipe is connected to the recycling fan, the end of the recycling fan is connected to the second recycling pipe, and flue gas of the second recycling pipe enters the grate multi-air chamber through the flue gas distributor; the air supply unit comprises an air pipe and a blower, the air pipe is connected to the grate multi-air chamber, and air is pumped into the air pipe through the blower and then enters the grate multi-air chamber to be mixed with the recirculated flue gas.

2. The flue gas recirculation auxiliary staged air distribution boiler of claim 1, wherein: the grate multi-air chamber comprises a main air chamber and an auxiliary air chamber, an outlet and an air pipe of the flue gas distributor are communicated to the auxiliary air chamber, the auxiliary air chamber is communicated to the main air chamber, and the main air chamber is connected to the hearth of the chain grate.

3. The flue gas recirculation auxiliary staged air distribution boiler of claim 1, wherein: and air adjusting doors are arranged at the joint of the smoke outlet pipe and the first recirculation pipe, the joint of the second recirculation pipe and the smoke distributor, the joint of the smoke distributor and the multiple air chambers of the fire grate and the joint of the air pipe and the multiple air chambers of the fire grate.

4. The flue gas recirculation auxiliary staged air distribution boiler of claim 1, wherein: an air preheater is arranged on the smoke outlet pipe, and the air pipe enters the multi-air exhaust chamber after passing through the air preheater.

5. The flue gas recirculation auxiliary staged air distribution boiler of claim 1, wherein: the connection position of the first recycling pipe and the smoke outlet pipe is positioned between the economizer and the air preheater.

6. The flue gas recirculation auxiliary staged air distribution boiler of claim 1, wherein: a monitor is arranged above a main air chamber of the grate multi-air chamber.

Technical Field

The invention belongs to the field of energy conservation and environmental protection, and relates to a boiler, in particular to a flue gas recirculation auxiliary grading air distribution boiler.

Background

Nowadays, environmental protection is a major subject of our country, and energy conservation and emission reduction are also the directions for enterprises to improve efforts. At present, the main source of air pollution is nitrogen oxide, and the harm of the nitrogen oxide is mainly reflected in the following aspects: firstly, nitrogen oxides can form acid rain; secondly, nitrogen oxides can cause respiratory diseases; thirdly, the nitrogen oxide can generate photochemical smog under the action of sunlight, and the road traffic safety can be reduced; fourthly, the nitrogen oxides can block the growth of plants, and further the harvest of agricultural products is influenced.

NOx control in combustion is primarily considered from two aspects: the formation of NOx in combustion is suppressed and NOx that has been formed is reduced. The former is mainly through changing the operation mode or improving the combustion process to reduce the generation of NOx, i.e. low NOx combustion technology. As a mode for reducing NOx in combustion, the flue gas recycling technology extracts the flue gas at the tail part of the boiler, and the flue gas is mixed with air and then fed into a hearth.

Through the search of the published patent documents, a published patent document similar to the present patent application is found.

Compare document publication No. CN205939204U, publication date 2017.02.08. The invention discloses a high-efficiency low-emission boiler flue gas recirculation device, which comprises a primary hot air duct connected to a boiler air chamber and a smoke exhaust pipe connected to a smoke outlet pipe at the tail part of a boiler. However, the heat enthalpy value of the recirculated flue gas is low, the flue gas and the air are mixed too early, so that the flue gas-air ratio of the hearth is difficult to adjust, and the air inlet quantity cannot be adjusted in real time according to the change of the working condition of the hearth.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides the flue gas recirculation auxiliary grading air distribution boiler, which recycles the flue gas with higher enthalpy value and saves energy; meanwhile, the air inlet volume and the smoke-air ratio of the hearth can be adjusted in real time, the combustion working condition of the hearth is improved, the concentration of NOx is reduced, and the environment-friendly effect is realized.

The utility model provides a flue gas recirculation assists hierarchical air distribution boiler, includes the traveling grate stoker, the left end of traveling grate stoker is connected the coal scuttle, the below of traveling grate stoker sets up the many wind rooms of grate, and the many wind rooms of grate communicate to the furnace of traveling grate stoker in, be located the economizer on the boiler barrel of traveling grate stoker and be connected with out the tobacco pipe, its characterized in that: the flue gas recycling unit comprises a first recycling pipe, a second recycling pipe, a flue gas distributor and a recycling fan, one end of the first recycling pipe is connected to the smoke outlet pipe, the other end of the first recycling pipe is connected to the recycling fan, the end of the recycling fan is connected to the second recycling pipe, and flue gas of the second recycling pipe enters the grate multi-air chamber through the flue gas distributor; the air supply unit comprises an air pipe and a blower, the air pipe is connected to the grate multi-air chamber, and air is pumped into the air pipe through the blower and then enters the grate multi-air chamber to be mixed with the recirculated flue gas.

And the grate multi-air chamber comprises a main air chamber and an auxiliary air chamber, an outlet and an air pipe of the flue gas distributor are communicated to the auxiliary air chamber, the auxiliary air chamber is communicated to the main air chamber, and the main air chamber is connected to the hearth of the chain grate.

And air adjusting doors are arranged at the joint of the smoke outlet pipe and the first recirculation pipe, the joint of the second recirculation pipe and the smoke distributor, the joint of the smoke distributor and the multiple air chambers of the fire grate and the joint of the air pipe and the multiple air chambers of the fire grate.

And an air preheater is arranged on the smoke outlet pipe, and the air pipe enters the furnace exhaust multi-air chamber after passing through the air preheater.

And the connection position of the first recycling pipe and the smoke outlet pipe is positioned between the economizer and the air preheater.

And a monitor is arranged above the main air chamber of the grate multi-air chamber.

The invention has the advantages and beneficial effects that:

1. According to the flue gas recirculation auxiliary grading air distribution boiler, one end of a first recirculation pipe is connected to a flue gas outlet pipe, the other end of the first recirculation pipe is connected to a recirculation fan, the end part of the recirculation fan is connected to a second recirculation pipe, and flue gas of the second recirculation pipe enters a grate multi-air chamber through a flue gas distributor; the tuber pipe is connected to the many plenum of grate, and the air enters into the many plenum of grate and recirculated flue gas after passing through the forced draught blower suction tuber pipe and mixes, recycles through the flue gas with the boiler afterbody, not only can the energy saving, reduces boiler combustion coal and uses, can reduce NOx concentration in the emission tail gas simultaneously, and pollution abatement improves environmental protection effect.

2. The invention relates to a flue gas recirculation auxiliary grading air distribution boiler, wherein a plurality of air chambers of a grate comprise a main air chamber and an auxiliary air chamber, an outlet and an air pipe of a flue gas distributor are communicated to the auxiliary air chamber, the auxiliary air chamber is communicated to the main air chamber, and the main air chamber is connected to the interior of a hearth of a chain grate, so that flue gas and air can be fully mixed, and the full combustion in the hearth can be ensured.

3. According to the smoke recycling auxiliary grading air distribution boiler, air adjusting doors are arranged at the joint of the smoke outlet pipe and the first recycling pipe, the joint of the second recycling pipe and the smoke distributor, the joint of the smoke distributor and the multiple air chambers of the fire grate and the joint of the air pipe and the multiple air chambers of the fire grate, so that the air inflow and the air inflow proportion of smoke and air can be adjusted in real time, the combustion condition of a hearth is improved, and the low NOx concentration emission is ensured.

4. According to the smoke recycling auxiliary grading air distribution boiler, the smoke outlet pipe is provided with the air preheater, the air pipe enters the grate multi-air chamber after passing through the air preheater, the initial temperature of air entering the grate multi-air chamber is increased, the combustion condition in the hearth is improved, sufficient combustion is guaranteed, and the concentration of NOx is reduced.

5. According to the smoke recirculation auxiliary grading air distribution boiler, the connecting position of the first recirculation pipe and the smoke outlet pipe is located between the economizer and the air preheater, smoke with a high enthalpy value can be recycled, the coal consumption of the boiler is reduced, and energy is saved.

6. According to the smoke recirculation auxiliary grading air distribution boiler, the monitor is arranged above the main air chamber of the grate multi-air chamber, so that the combustion condition in a hearth can be monitored in real time, and the air inflow can be adjusted in time.

7. The invention has scientific and reasonable design, the flue gas and the air are uniformly mixed, the flue gas with higher enthalpy can be recycled, and the energy is saved; meanwhile, the combustion working condition in the hearth can be monitored in real time, the air inlet volume and the smoke-air ratio of the hearth can be adjusted in real time, the combustion working condition of the hearth is improved, the concentration of NOx is reduced, and the environment-friendly effect is realized.

Drawings

FIG. 1 is a flow chart of the smoke and air of the present invention;

Fig. 2 is a schematic structural diagram of the present invention.

Description of the reference numerals

the system comprises a coal hopper 1, a chain grate 2, a hearth 3, a grate 4, a multi-air chamber 5, a furnace barrel 6, an economizer 7, an air preheater 8, a first recycle pipe 9, a recycle fan 10, a second recycle pipe 11, an air adjusting door 12, a flue gas distributor 13, a blower 13, a main air chamber 14, a main air chamber 15, an air pipe 16, a monitor 17, an auxiliary air chamber 17 and a flue gas outlet pipe 18.

Detailed Description

The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.

The utility model provides a supplementary hierarchical air distribution boiler of flue gas recirculation, includes traveling grate 2, and the left end of traveling grate connects coal scuttle 1, and the below of traveling grate sets up fire grate many plenum 4, and many plenum lead to in the furnace 3 of traveling grate, and the furnace tube 5 of traveling grate is located economizer 6 and is connected with out tobacco pipe 18, and its innovation point lies in: the flue gas recycling unit comprises a first recycling pipe 8, a second recycling pipe 10, a flue gas distributor 12 and a recycling fan 9, one end of the first recycling pipe is connected to the flue gas outlet pipe, the other end of the first recycling pipe is connected to the recycling fan, the end part of the recycling fan is connected to the second recycling pipe, and flue gas of the second recycling pipe enters the grate multi-air chamber through the flue gas distributor; the air supply unit comprises an air pipe 15 and a blower 13, the air pipe is connected to the grate multi-air chamber, air enters the grate multi-air chamber after being pumped into the air pipe through the blower and is mixed with recirculated flue gas, and the flue gas at the tail part of the boiler is recycled, so that energy can be saved, the use of boiler combustion coal is reduced, the concentration of NOx in discharged tail gas can be reduced, pollution is reduced, and the environment-friendly effect is improved.

The grate multi-air chamber comprises a main air chamber 14 and an auxiliary air chamber 17, the outlet of the flue gas distributor and the air pipes are communicated to the auxiliary air chamber, the auxiliary air chamber is communicated to the main air chamber, the main air chamber is connected to the hearth of the chain grate, so that flue gas and air can be fully mixed, and the full combustion in the hearth is ensured.

The air adjusting doors 11 are arranged at the joint of the smoke outlet pipe and the first recirculation pipe, the joint of the second recirculation pipe and the smoke distributor, the joint of the smoke distributor and the multiple air chambers of the fire grate and the joint of the air pipe and the multiple air chambers of the fire grate, so that the air input and the air inlet proportion of smoke and air can be adjusted in real time, the combustion working condition of a hearth is improved, and the low NOx concentration emission is ensured.

The smoke outlet pipe is provided with an air preheater 7, and the air pipe enters the grate multi-air chamber after passing through the air preheater, so that the initial temperature of the air entering the grate multi-air chamber is increased, the combustion condition in the hearth is improved, and the full combustion is ensured to reduce the concentration of NOx.

The connecting position of the first recycling pipe and the smoke outlet pipe is positioned between the economizer and the air preheater, so that smoke with higher enthalpy value can be recycled, the coal burning use of the boiler is reduced, and the energy is saved.

A monitor 16 is arranged above a main air chamber of the grate multi-air chamber, so that the combustion condition in the hearth can be monitored in real time, and the air inflow can be adjusted in time.

Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.