CN209524520U - A kind of refuse incinerator low NOx combustion system - Google Patents

Abstract

The utility model relates to burning city domestic garbage field, especially a kind of refuse incinerator low NOx combustion system, main body includes smoke backflow blower, primary air fan, electric control valve, manual modulation valve, smoke wind pipe, smoke backflow header and nozzle.Flue gas from bag house outlet is sufficiently mixed with the First air exported from primary air fan, and flue gas uniformly sprays into burner hearth by encircleing two layers of nozzle before and after boiler under the action of flowing back blower respectively after mixing.The utility model process system is simple, stable, it can be effectively controlled fire box temperature and realize low oxygen combustion, it reduces and burns outlet of still NOx original concentration, improve boiler capacity, while the low-temperature corrosions problem such as boiler coke and reflux blower, pipeline, nozzle can have been further prevented.

Description

A kind of refuse incinerator low NOx combustion system

Technical field

The utility model relates to burning city domestic garbage field, especially a kind of waste incinerator low NOx combustion system.

Background technique

In recent years, the burning disposal amount of Municipal Solid Waste in China is substantially improved, and reciprocating machine grate furnace incineration technology exists It is widely used both at home and abroad, is current optimum burning disposal rubbish and produces steaming using the thermal energy that waste incineration generates Technology of the vapour for power generation.Meanwhile flue gas discharged in burning standard is also increasingly strict, realizes that minimum discharge has become waste incineration The trend of power industry development.The NOx of garbage burning factory boiler emission can form acid rain and photochemical fog in an atmosphere, harm The normal growth of human health and crops.

However, rubbish is during incinerator burns, there are still following problems: 1. excess air coefficients are excessive, usually exist Between 1.7~2.0, boiler exhaust gas loss further causes system for cleaning fume greatly and the load of air-introduced machine is excessive.2. combustion The content for burning NOx in the flue gas generated is higher.

Utility model content

The utility model aim is to solve boiler caused by burning flue gas loss big, NOx original concentration height, flue gas overtemperature etc. The problems such as low efficiency, high operating cost.

In order to solve the above technical problems, the utility model provides a kind of refuse incinerator low NOx combustion system, packet Include primary air fan, First air main pipeline, First air branch pipe(tube), First air preheater, incinerator, waste heat boiler, smoke backflow wind Machine, electric adjustable section door, manually adjusts door, header, nozzle at backflow flue gas pipeline.Wherein, backflow flue gas draws from sack cleaner Out, it is connected by backflow flue gas pipeline with reflux blower；Combustion air enters one by First air main pipeline from dump pit Secondary blower is divided to two branches after the heating of First air preheater, and entering slag bucket below fire grate by the First air of branch is in furnace Oxygen needed for incineration firing；First air is connect with backflow flue gas pipeline in branch, and reflux wind is entered after mixing with backflow flue gas Machine, flue gas encircles header by front and back after mixing and nozzle enters in incinerator.

Further, the smoke backflow after depickling and dedusting is entered in bag house outlet setting backflow flue gas interface Furnace.

Further, cancel independent secondary air fan, a part of hot-air after preheater heats utilizes First air Compressing head enters after First air branch pipe(tube) is mixed with backflow flue gas to be used as incinerator Secondary Air, and is set in First air branch pipe(tube) Electric adjustable section door is to control secondary air flow.

Further, position at outlet of still and exhaust-heat boiler inlet is being burned, i.e., arch respectively sets symmetrical reflux cigarette before and after boiler It two layers of gas jets, sets before header and manually adjusts door, the symmetrical interlaced arrangement of every layer of nozzle.

Further, nozzle and level are at 20 DEG C at boiler front arch, and nozzle level direction is arranged at boiler rear arch, mix cigarette Gas blowout enters to be intersected in incineration flue gas center in furnace, forms strong turbulent flow, and the content of CO in maximum flue gas guarantees sufficiently combustion It burns.

Technical solution provided by the utility model can achieve following the utility model has the advantages that burning outlet of still oxygen content can be reduced 5% hereinafter, realize low oxygen combustion, it is suppressed that the generation of fuel type NOx.

Secondly, touching mouth arrangement using two layers, by 950 DEG C of flue gas temperature of hearth outlet or so fluctuations of control, realizes and stablize Burning inhibits thermal NO x and CO to generate, while can prevent boiler coke, increases the service life of refractory material.

In addition, by realizing that excess air coefficient than burning, is maintained at 1.4 or less, it is suppressed that fuel type NOx by low latitude gas It generates, while improving generating efficiency；The reduction of exhaust smoke level is conducive to the simplification of fume treatment and its subsystem, reduces investment And operating cost.

Finally, mixing using hot Secondary Air with backflow flue gas, the oxygen amount in boiler export flue gas can be flexibly controlled, while can Effectively avoid the low-temperature corrosions problem such as backflow flue gas pipeline and blower, nozzle.

Detailed description of the invention:

Fig. 1 is the utility model waste incinerator low NOx combustion system structural schematic diagram.

Fig. 2 is the arrangement of nozzles schematic diagram of the utility model.

Fig. 3 is the schematic diagram that the boiler front arch nozzle of the utility model is connect with header.

Fig. 4 is the schematic diagram that the boiler rear arch nozzle of the utility model is connect with header.

In figure, 1- electric adjustable section door, 2- First air blower, 3- First air preheater, 4- flows back blower, and 5- manually adjusts Door, 6- incinerator, 7- waste heat boiler, the first branch pipe(tube) of 8- First air, the second branch pipe(tube) of 9- First air, 10- First air main pipeline, 11- smoke backflow pipeline, 12- header, 13- nozzle, 14- boiler front arch, 15- boiler rear arch.

Specific embodiment

For the utility model aim, technical solution and advantage is more clearly understood, below with reference to the attached of the utility model Figure and example, clear and complete description is carried out to the utility model；

There are mainly two types of NOx is generated in waste incinerator: thermal NO x and fuel type NOx, furnace temperature is excessively high or temperature field is divided Cloth unevenness easily leads to thermal NO x generation, the more big easy generation fuel type NOx of excess air coefficient.

For this purpose, the utility model provides a kind of refuse incinerator low NOx combustion system, as shown in Figure 1, including one Secondary blower 2, First air main pipeline 10, First air branch pipe(tube) are the first branch pipe(tube) of First air 8, the second branch pipe(tube) of First air respectively 9, First air preheater 3, incinerator 6, waste heat boiler 7, smoke backflow blower 4, backflow flue gas pipeline 11, electric adjustable section door 1, hand It is dynamic to adjust door 5, header 12, nozzle 13.

The bag house outlet sets pipe joint, and backflow flue gas is drawn from bag house outlet, passes through the cigarette that flows back Feed channel is connected with reflux blower；Combustion air enters primary air fan by First air main pipeline from dump pit, through primary It is divided to two branches after the heating of wind preheater, fire grate lower section slag bucket is entered for needed for incineration firing in furnace by the First air of branch Oxygen；First air is connect with backflow flue gas pipeline in another branch, and reflux blower, cigarette after mixing are entered after mixing with backflow flue gas Gas encircles header by front and back and nozzle enters in incinerator.As shown in Fig. 2, the arrangement of nozzles schematic diagram of the utility model.Fig. 3 is The schematic diagram that the boiler front arch nozzle of the utility model is connect with header.Fig. 4 is the boiler rear arch nozzle and collection of the utility model The schematic diagram of case connection.Position at outlet of still and exhaust-heat boiler inlet is being burned, i.e. boiler front arch 14, rear arch 5 respectively sets symmetrical return It flows two layers of flue gas nozzle, is set before header and manually adjust door, the symmetrical interlaced arrangement of every layer of nozzle.

The low NOx operation of incinerator mainly has two o'clock: first is that control chamber flue gas temperature at 950 DEG C hereinafter, not less than 850 DEG C 2 seconds, second is that control the oxygen content of flue gas 5% once.

It is controlled in terms of fire box temperature, when incinerator is run, is by adjusting First air blower 2 and electric adjustable section door 1 Incinerator provides combustion air, while according to furnace exit temperature, adjusting reflux 4 frequency of blower and 1 aperture of electric adjustable section door, 950 DEG C of furnace temperature or less are burned to adjust by changing smoke backflow amount ratio.

About the control of boiler export oxygen amount, when guaranteeing that furnace exit temperature is normal, according to heat boiler outlet oxygen amount, It is that boiler supplements oxygen amount by the electric adjustable section door 1 adjusted in secondary air duct 9, guarantees boiler export oxygen amount below 5%.

The following are the specific examples of the utility model: garbage treatment quantity 750t/d, refuse thermal value 1900kcal/kg, once 150 DEG C of wind-warm syndrome, 150 DEG C of backflow flue gas temperature, 950 DEG C of heater outlet temperature are burned, oxygen amount can be controlled in 5% hereinafter, according to burning Capacity of furnace balance and material balance, smoke backflow ratio can increase 2.0t/ up to 19.2%, using boiler capacity when the system h。

Claims (6)

1. a kind of refuse incinerator low NOx combustion system, which is characterized in that including primary air fan, First air main pipeline, one Secondary wind branch pipe(tube), First air preheater, incinerator, waste heat boiler, smoke backflow blower, backflow flue gas pipeline, electric adjustable section door, Manually adjust door, header, nozzle；Wherein, backflow flue gas is drawn from sack cleaner, passes through backflow flue gas pipeline and reflux blower It is connected；Combustion air enters primary air fan by First air main pipeline from dump pit, divides after the heating of First air preheater Two branches, entering slag bucket below fire grate by the First air of the first branch is oxygen needed for incineration firing in furnace；Second First air is connect with backflow flue gas pipeline in road, reflux blower is entered after mixing with backflow flue gas, flue gas passes through front and back after mixing Arch header and nozzle enter in incinerator.

2. a kind of refuse incinerator low NOx combustion system according to claim 1, which is characterized in that removed in pocket type Dirt device outlet setting backflow flue gas interface, enters furnace for the smoke backflow after depickling and dedusting.

3. a kind of refuse incinerator low NOx combustion system according to claim 1, which is characterized in that do not set independence Secondary air fan, a part of hot-air after preheater heats enters First air branch pipe(tube) and returns using primary air fan pressure head It uses after stream flue gas mixing as incinerator Secondary Air, and it is secondary distinguished and admirable to control in First air branch pipe(tube) to set electric adjustable section door Amount.

4. a kind of refuse incinerator low NOx combustion system according to claim 1, which is characterized in that before boiler Rear arch is symmetrical arranged two layers of backflow flue gas nozzle, sets before header and manually adjusts door, the symmetrical interlaced arrangement of every layer of nozzle.

5. a kind of refuse incinerator low NOx combustion system according to claim 1, which is characterized in that boiler front arch Locate nozzle and level into 20 DEG C, nozzle level direction is arranged at boiler rear arch；Mixed flue gas sprays into furnace and is intersected in incineration flue gas Center reduces the content of CO in flue gas by forming strong turbulent flow to greatest extent.

6. a kind of refuse incinerator low NOx combustion system according to claim 1, which is characterized in that pass through burning Oxygen content in outlet of still flue-gas temperature and flue gas adjusts backflow flue gas amount and primary air flow respectively.