CN102252333A

CN102252333A - Method and treatment system for reducing nitrogen oxides by using incineration of refuse landfill gas

Info

Publication number: CN102252333A
Application number: CN2011101159365A
Authority: CN
Inventors: 曾纪进; 陈国艳
Original assignee: FUJIAN FENGQUAN ENVIRONMENTAL PROTECTION CONTROL Co Ltd
Current assignee: FUJIAN FENGQUAN ENVIRONMENTAL PROTECTION CONTROL Co Ltd
Priority date: 2011-05-05
Filing date: 2011-05-05
Publication date: 2011-11-23
Anticipated expiration: 2031-05-05
Also published as: CN102252333B

Abstract

The invention relates to a refuse landfill gas burning and re-burning technology, and in particular relates to a method and a treatment system for reducing nitrogen oxides by using incineration of refuse landfill gas. The treatment system mainly consists of a refuse landfill, an air pipe, a fan, the other air pipe and an incinerator connected sequentially; during working, the landfill gas of the refuse landfill is led out by the fan through the air pipe, delivered to the incinerator through the other air pipe, and burnt and re-burnt by the incinerator; and the landfill gas is used for reducing NOx in the incinerator, so that the NOx content of the flue gas exhausted by the incinerator is effectively reduced. The method and the system solve the problem of air pollution caused by stench of the refuse landfill and the problem of NOx concentration in the flue gas exhausted by the refuse incinerator, and are particularly suitable for a newly built refuse power plant, particularly a refuse burning power plant which is built nearby the refuse landfill and can provide the landfill gas more conveniently and effectively.

Description

Utilize garbage loading embeading gas to burn method and the treatment system thereof that reduces nitrogen oxide

Technical field

The present invention relates to burning of a kind of garbage loading embeading gas and combustion technology again, be meant especially and a kind ofly utilize garbage loading embeading gas to burn to reduce nitrogen oxide that (chemical formula: NOx (following this chemical formula of all using) is as NO ₂, NO, N ₂O etc.) method and treatment system thereof.

Background technology

Because China's junk-free treatment technology development is later, mainly be based on garbage loading embeading in the past therefore.China's refuse landfill enormous amount, these refuse landfills all can have a large amount of gas that peculiar smell is arranged to discharge every day, and wherein topmost fuel gas is methane (CH ₄), if can be effectively to its utilization, will be to environment, ecology and economic significant.

In the incinerator burner hearth and the main pernicious gas in the flue gas of discharging be NOx.NOx is one of main atmosphere pollution, and it not only is detrimental to health, destroys atmospheric environment, and can form photochemical fog, acid rain, and the high-altitude ozone layer is produced very big destruction, and human sustainable development is caused serious threat.

SNCR method (SNCR), selective catalytic reduction (SCR) still because these technology are that gas fume after burning is carried out post processing, thereby all need extra equipment and place though the flue gas treatment technology can reduce the discharging of NOx significantly.The expensive catalyst of SCR Technology Need in addition, promptly to handle operating cost very high for flue gas; And the effecting reaction temperature range of SNCR technology is narrow, control difficulty, so SNCR, SCR flue gas treatment technology China all difficulty promote the use of.

Therefore, at the characteristics of China's rubbish and the deployment scenarios in China soot, the development investment cost is low, energy-saving and environmental protection, continuable green technology that the actual motion business efficiency is high just seem particularly important.

Summary of the invention

The purpose of this invention is to provide a kind of garbage loading embeading gas that utilizes and burn method and the treatment system thereof that reduces nitrogen oxide, can utilize the reducibility gas CH in the landfill gas ₄NOx Deng reducing the incinerator burner hearth can also improve the calorific value of waste incineration.

For realizing purpose of the present invention, the inventor takes following technical scheme: a kind of garbage loading embeading gas that utilizes burns the treatment system that reduces nitrogen oxide, it is mainly connected to form successively by refuse landfill, airduct, blower fan, another airduct, incinerator, during work, the landfill gas of refuse landfill is drawn by blower fan by airduct, send into incinerator through another airduct again, burn and combustion again by incinerator, NOx in the landfill gas reduction incinerator effectively reduces the content that incinerator discharges NOx in the flue gas.

For realizing purpose of the present invention, the inventor also takes following technical scheme: a kind of garbage loading embeading gas that utilizes burns the method that reduces nitrogen oxide, it is the method for work of above-mentioned treatment system, concrete steps are: (1), the landfill gas of refuse landfill is drawn by blower fan by airduct, send into incinerator through another airduct again; (2), one road landfill gas spout that will enter incinerator is located at the burning zone of incinerator, landfill gas and incinerator primary air burn in the reaction of incinerator bottom, simultaneously, the landfill gas spout that another road is entered incinerator is located at the incinerator reduction section, and the pernicious gases such as NOx that waste incineration produces become nitrogen (N under the reduction of landfill gas ₂); (3), the after-flame section above the incinerator reduction section is blown into incinerator secondary wind, makes secondary wind and the carbon compound generation disturbance reaction that does not react completely, under the condition of excess air, combustible fully burns; (4), rubbish and garbage loading embeading gas are discharged flue tail gas through after the second-time burning.

Beneficial effect of the present invention:

(1) refuse landfill produces CH ₄Can effectively be collected Deng gas, air keeps pollution-free near the refuse landfill, near the resident living can not having influence on.

(2) refuse landfill produces CH ₄Deng gas, be collected to be ejected in the incinerator by blower fan and burn, can improve the temperature in the burner hearth, also can reduce NOx concentration in the burner hearth.

(3) by the application of the technology of the present invention, can effectively reduce the NOx concentration of furnace outlet, effectively alleviate the purified treatment burden of flue gas, save the smoke treatment expense.

(4) behind employing the present invention, combustible increases in the stove, effectively raises temperature in the burner hearth, has increased quantity of steam, also will increase generated energy etc., can bring considerable economic well-being of workers and staff.

The present invention had both solved the odor pollution air problem of refuse landfill, solved the problem that reduces NOx concentration in the incinerator discharging flue gas again, be specially adapted to newly-built refuse-burning plant, especially garbage incinerating power plant is built near the refuse landfill, can the more convenient landfill gas that effectively provides.

Description of drawings

Fig. 1 burns the method flow schematic diagram that reduces nitrogen oxide for the garbage loading embeading gas that utilizes of the present invention;

Fig. 2 burns schematic flow sheet for the garbage loading embeading gas that utilizes of the present invention in incinerator.

Embodiment

Now describe the embodiment of patent of the present invention in detail: as shown in Figure 1 in conjunction with Figure of description, a kind of treatment system of utilizing garbage loading embeading gas burn to reduce nitrogen oxide, this treatment system mainly by refuse landfill 1, airduct 2, blower fan 3, another airduct 2 ', incinerator 4 connects to form successively.Shown in Fig. 1,2, the method for work of this system may further comprise the steps: (1), the landfill gas 10 of refuse landfill 1 is drawn by blower fan 3 by airduct 2, and again through another airduct 2 ' send into incinerator 4; (2), one road landfill gas spout that will enter incinerator 4 is located at the burning zone 41 of incinerator, landfill gas 10 burns in the reaction of incinerator bottom with incinerator primary air 20, both can improve the incineration firing calorific value in the stove, improve the temperature of burner hearth, also can play the effect of combustion-supporting rubbish, help the burning of rubbish; Simultaneously, the landfill gas spout that another road is entered incinerator 4 is located at incinerator reduction section 42, and the nitrogen oxide pernicious gases such as (NOx) that waste incineration produces becomes nitrogen (N under the reduction of landfill gas (acting as reducing gas this moment) ₂); (3), the after-flame section 43 above incinerator reduction section 42 is blown into incinerator secondary wind 30 and the carbon compound generation disturbance reaction that does not react completely, under the condition of excess air, combustible fully burns; (4), rubbish and garbage loading embeading gas are through discharging flue tail gas 40 after the second-time burning.Content through NOx in the flue gas of combustion back discharge again can reach 190mg/Nm ³, be lower than the standard 200mg/Nm of European Union ³

Of the present inventionly utilize the rubbish landfill gas burn to reduce the nitrogen oxide inventive principle to be: by NOx form and failure mechanism as can be known, the NOx that has generated is running into hydrocarbon root CH _i, C _nH _mWith imperfect combustion product C O, H ₂, during C, the reduction reaction of NOx can take place.Utilize this principle, an amount of landfill gas is sprayed into incinerator reduction section 42 (being positioned at secondary wind bottom), form strong reducing atmosphere, generate a large amount of hydrocarbon roots, make the NOx that in burning zone 41, generates in reduction section 42, be reduced into nitrogen (N ₂), also suppressed the generation of new NOx simultaneously.At last, under the mixed combustion of secondary wind, make and do not fire the abundant after-flame of composition.

Claims

1. utilize garbage loading embeading gas to burn the treatment system that reduces nitrogen oxide, it is characterized in that: this treatment system is mainly connected to form successively by refuse landfill, airduct, blower fan, another airduct, incinerator.

2. utilize garbage loading embeading gas to burn the method that reduces nitrogen oxide, it is the method for work of the described treatment system of claim 1, the steps include: (1), the landfill gas of refuse landfill is drawn by blower fan by airduct, send into incinerator through another airduct again; (2), one road landfill gas spout that will enter incinerator is located at the burning zone of incinerator, landfill gas and incinerator primary air burn in the reaction of incinerator bottom, simultaneously, the landfill gas spout that another road is entered incinerator is located at the incinerator reduction section, and the nitrogen oxide pernicious gases such as (NOx) that waste incineration produces becomes nitrogen (N under the reduction of landfill gas ₂); (3), the after-flame section above the incinerator reduction section is blown into incinerator secondary wind, makes secondary wind and the carbon compound generation disturbance reaction that does not react completely, under the condition of excess air, combustible fully burns; (4), rubbish and garbage loading embeading gas are discharged flue tail gas through after the second-time burning.