阅读说明：本技术 一种烟气高效回用秸秆捆烧方法 (A kind of efficient reuse straw bundle firing method of flue gas ) 是由 姚宗路 贾吉秀 赵立欣 郝先荣 邓云 丛宏斌 赵亚男 于 2019-09-27 设计创作，主要内容包括：本发明涉及秸秆捆烧技术领域,提供了一种烟气高效回用秸秆捆烧方法。本发明首先对打捆秸秆进行除尘预处理；预处理后的打捆秸秆进入三级燃烧室进行三级配风燃烧；三级配风燃烧过程中产生的热量通过换热系统传递给循环水,循环水进行供热和供暖应用；第三燃烧室产生的烟气对除尘预处理后的打捆秸秆进行脱水烘干,实现余热回用；余热回用后的烟气进行烟气除尘后排放。本发明提供的方法集成了原料预处理、多级燃烧、高效换热、烟气回用以及烟气净化除尘等工序,完善了秸秆捆烧体系,且能够对烟气进行高效回用,余热回用后的烟气净化方法简单；并且本发明的方法对打捆秸秆进行三级配风燃烧,实现了打捆秸秆的高效、低氮燃烧。(The present invention relates to straw bundle burning technology fields, provide a kind of efficient reuse straw bundle firing method of flue gas.The present invention is dusted pretreatment to bundling stalk first；Pretreated bundling stalk enters three-level combustion chamber and carries out three-level air distribution combustion；The heat generated in three-level air distribution combustion process passes to recirculated water by heat-exchange system, and recirculated water carries out heat supply and heating application；The flue gas that third combustion chamber generates carries out dewatered drying to the pretreated bundling stalk of dedusting, realizes residual heat recovery；Flue gas after residual heat recovery discharges after carrying out flue gas ash removal.The processes such as method integration provided by the invention pretreatment of raw material, multistage combustion, high efficient heat exchanging, flue gas reuse and gas cleaning dedusting, perfect straw bundle burns system, and efficient reuse can be carried out to flue gas, and the flue gas purifying method after residual heat recovery is simple；And method of the invention carries out three-level air distribution combustion to bundling stalk, realizes efficient, the low nitrogen burning of bundling stalk.)

1. a kind of efficient reuse straw bundle firing method of flue gas, which comprises the following steps:

(1) pretreatment is dusted to bundling stalk；

(2) pretreated bundling stalk enters three-level combustion chamber progress three-level air distribution combustion；The three-level air distribution combustion includes: Pretreated bundling stalk enters the first combustion chamber and carries out first time burning, and the straw charcoal and combustible gas of generation enter the second combustion It burns room and carries out second of burning, the flue gas that second of burning generates enters third combustion chamber and carries out third time burning；

(3) heat generated in three-level air distribution combustion process passes to recirculated water by heat-exchange system, recirculated water carry out heat supply and Heating application；

(4) flue gas that third combustion chamber generates carries out dewatered drying to the pretreated bundling stalk of dedusting, realizes residual heat recovery；

(5) flue gas after residual heat recovery discharges after carrying out flue gas ash removal.

2. the method according to claim 1, wherein the dedusting pretreatment in the step (1) is vibrated to use Sieve carries out vibrating dust removing, cropland application after the dust generated after dedusting is collected.

3. method according to claim 1 or 2, which is characterized in that in the step (1) bundling stalk traveling-grate stoker or Reciprocal grate is conveyed.

4. the method according to claim 1, wherein in the step (1) bundling stalk moisture content≤40%.

5. the method according to claim 1, wherein the second combustion chamber is located at the first burning in the step (2) Below room, third combustion chamber is located at the first combustion chamber side；The three-barreled inner cavity is cyclone structure.

6. the method according to claim 1, wherein in the first burning when burning for the first time in the step (2) The primary uniform wind of room side wall fitted underneath；Secondary uniform wind is equipped in the second bottom of combustion chamber when second of burning；Third time is fired Whirl deposite tank three times is equipped with when burning at three-barreled smoke inlet.

7. the method according to claim 1, wherein the ignition temperature of the first combustion chamber is in the step (2) 600~800 DEG C, the ignition temperature of the second combustion chamber is 900~1100 DEG C.

8. method described according to claim 1 or 5 or 6, which is characterized in that the heat-exchange system in the step (3) includes: One sidewall of combustion chamber and upper wall are water jacket samdwich, transfer heat to recirculated water by radiant heat transfer；Second combustion chamber top is Circulating water pipe transfers heat to recirculated water by radiation and convective heat transfer；Third sidewall of combustion chamber is water jacket samdwich, passes through spoke It penetrates and transfers heat to recirculated water with convective heat transfer.

9. the method according to claim 1, wherein the third combustion chamber generate flue-gas temperature be 180~ 220 DEG C, dewatered drying is carried out to the pretreated bundling stalk of dedusting using the flue gas that third combustion chamber generates.

10. the method according to claim 1, wherein the flue gas ash removal method in the step (5) includes whirlwind One or more of dedusting, water film dedusting and bag-type dust.

Technical field

The present invention relates to straw bundle burning technology field, in particular to a kind of efficient reuse straw bundle firing method of flue gas.

Background technique

Straw bundle burning technology is a kind of preferable stalk recovery energy mode, is by the loose stalk in field by picking up The technical process of combustion heat supplying again after bundling.Energy density is improved after stalk bundling, reduces receipts carrying cost, while bundled Efficiency of combustion and boiler heat supplying efficiency greatly improved in straw semi-gasification burning afterwards, has preferable economic benefit.Straw at present Stalk is tied there are mainly two types of burning technologies, and one is the bale boiler combustion systems of intermittent feeding type, i.e., will burn indoor stalk combustion Again the characteristics of mode of charge combustion again after material is all burnt down, intermittent feeding bundle is burnt is that occupied area is small, is run simple to operation It is convenient, can direct labor charge, deashing etc., commonly used in the heating of small building；Another kind is that continous way bundle is burnt Continuous feed in combustion process, continuous deashing may be implemented in boiler system, maintains a stable combustion state in combustion chamber, Fire box temperature fluctuating range is smaller, is conducive to intelligent operation, is suitble to heavy construction or central heating region.

Foreign biomolecule matter stalk bundling combustion technology, which develops more mature country, Denmark, France and Belgium etc..It is red Wheat utilizes in the burning that the 1970s has just had begun entire bundle stalk, burns equipment by the continous way bundle of Denmark's research and development and is known as Cigar formula burner, due to its combustion system with the cigar lighted like, referred to as Cigar burner, continuous burning Process control is good, and furnace temperature is stablized, and is conducive to intelligent operation, therefore obtained large-scale promotion and application, quilt in foreign countries It is considered current combustion entire bundle stalk best mode.Domestic continuous bundle burning equipment research is less, mainly Agricultural University Of He'nan Liu The traveling-grate stoker that Sheng Yong team develops, which is continuously tied, burns equipment, and Tieling Zhong Yuan equipment manufacture of environmental protection Co., Ltd develops continuously to tie to burn and set It is standby；The stokehold flue gas drying biomass bunch burning boiler etc. that the favorable to the people power economized boiler Manufacturing Co., Ltd of Hailun City develops.

Bundling combustion apparatus research in China's is started late, and bundling combustion technology theory is left to be desired, although having there is scale The demonstration project of change, but there are still burning, insufficient, efficiency of combustion is lower, discharged nitrous oxides mistake in actual operation High, the problems such as flue gas purifying technique is cumbersome.Therefore, it improves straw bundle and burns theory, optimization bundle firing technique improves bundle and combusts effect Rate reduces soot emissions etc., also needs to carry out further investigation exploration.

Summary of the invention

It is an object of that present invention to provide a kind of efficient reuse straw bundle firing methods of flue gas.Method integration provided by the invention The processes such as pretreatment of raw material, multistage combustion, high efficient heat exchanging, flue gas reuse and gas cleaning dedusting, bundling straw burning is abundant, Realize efficient, the low nitrogen burning of bundling stalk.

In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:

A kind of efficient reuse straw bundle firing method of flue gas, comprising the following steps:

(1) pretreatment is dusted to bundling stalk；

(2) pretreated bundling stalk enters three-level combustion chamber progress three-level air distribution combustion；The three-level air distribution combustion It include: that pretreated bundling stalk enters the progress first time burning of the first combustion chamber, the straw charcoal and combustible gas of generation enter Second combustion chamber carries out second and burns, and the flue gas that second of burning generates enters third combustion chamber and carries out third time burning；

(3) heat generated in three-level air distribution combustion process passes to recirculated water by heat-exchange system, and recirculated water is supplied Heat and heating application；

(4) flue gas that third combustion chamber generates carries out dewatered drying to the pretreated bundling stalk of dedusting, realizes waste heat Reuse；

(5) flue gas after residual heat recovery discharges after carrying out flue gas ash removal.

Preferably, the dedusting pretreatment in the step (1) generates after dedusting to carry out vibrating dust removing using vibrating screen Cropland application after dust is collected.

Preferably, bundling stalk is conveyed with traveling-grate stoker or reciprocal grate in the step (1).

Preferably, in the step (1) bundling stalk moisture content≤40%.

Preferably, the second combustion chamber is located at below the first combustion chamber in the step (2), and third combustion chamber is located at the first combustion Burn room side；The three-barreled inner cavity is cyclone structure.

Preferably, in the primary uniform wind of the first sidewall of combustion chamber fitted underneath when burnt in the step (2) for the first time；The Secondary uniform wind is equipped in the second bottom of combustion chamber when second-time burning；When third time is burnt at three-barreled smoke inlet It is equipped with Whirl deposite tank three times.

Preferably, the ignition temperature of the first combustion chamber is 600~800 DEG C in the step (2), the burning of the second combustion chamber Temperature is 900~1100 DEG C.

Preferably, the heat-exchange system in the step (3) includes: the first sidewall of combustion chamber and upper wall is water jacket samdwich, is led to Overshoot heat transfer transfers heat to recirculated water；Second combustion chamber top is circulating water pipe, will be hot by radiation and convective heat transfer Amount passes to recirculated water；Third sidewall of combustion chamber is water jacket samdwich, transfers heat to recirculated water by radiation and convective heat transfer.

Preferably, the flue-gas temperature that the third combustion chamber generates is 180~220 DEG C, is generated using third combustion chamber Flue gas carries out dewatered drying to the pretreated bundling stalk of dedusting.

Preferably, the flue gas ash removal method in the step (5) includes in cyclone dust removal, water film dedusting and bag-type dust It is one or more of.

The present invention provides a kind of efficient reuse straw bundle firing methods of flue gas, wherein being dusted first to bundling stalk pre- Processing；Pretreated bundling stalk enters three-level combustion chamber and carries out three-level air distribution combustion；It is generated in three-level air distribution combustion process Heat recirculated water is passed to by heat-exchange system, recirculated water carries out heat supply and heating application；The flue gas that third combustion chamber generates Dewatered drying is carried out to the pretreated bundling stalk of dedusting, realizes residual heat recovery；Flue gas after residual heat recovery carries out flue gas and removes It is discharged after dirt.Method integration provided by the invention pretreatment of raw material, multistage combustion, high efficient heat exchanging, flue gas reuse and flue gas The processes such as purifying and dedusting, perfect straw bundle burn system, flue gas are efficiently utilized, the flue gas purifying method letter after residual heat recovery It is single；And method of the invention carries out three-level air distribution combustion to bundling stalk, realizes efficient, the low nitrogen burning of bundling stalk.

Detailed description of the invention

Fig. 1 is the process flow chart of the efficient reuse straw bundle firing method of flue gas of the present invention.

Specific embodiment

The present invention provides a kind of efficient reuse straw bundle firing methods of flue gas, comprising the following steps:

(1) pretreatment is dusted to bundling stalk；

(2) pretreated bundling stalk enters three-level combustion chamber progress three-level air distribution combustion；The three-level air distribution combustion It include: that pretreated bundling stalk enters the progress first time burning of the first combustion chamber, the straw charcoal and combustible gas of generation enter Second combustion chamber carries out second and burns, and the flue gas that second of burning generates enters third combustion chamber and carries out third time burning；

(3) heat generated in three-level air distribution combustion process passes to recirculated water by heat-exchange system, and recirculated water is supplied Heat and heating application；

(4) flue gas that third combustion chamber generates carries out dewatered drying to the pretreated bundling stalk of dedusting, realizes waste heat Reuse；

(5) flue gas after residual heat recovery discharges after carrying out flue gas ash removal.

The present invention is dusted pretreatment (stalk pretreatment process) to bundling stalk first.In the present invention, described to beat Bundle stalk is preferably round bale or square bale, the moisture content of the bundling stalk preferably≤40%, more preferably≤30%；The present invention is to institute The volume or weight for stating bundling stalk does not have particular/special requirement, uses the bundling stalk of volume or weight known to those skilled in the art .

In the present invention, it is preferable to use vibrating screens to carry out vibrating dust removing, the dust generated after dedusting for the dedusting pretreatment It is preferred that cropland application after collecting；The present invention does not have particular/special requirement to the actual conditions of vibrating dust removing, can be by the dirt on stalk surface Soil removal.

After pretreatment, bundling stalk enters three-level combustion chamber and carries out three-level air distribution combustion (multistage air distribution combustion process).In In the present invention, the three-level combustion chamber includes the first combustion chamber, the second combustion chamber and third combustion chamber；First combustion chamber is Main chamber, the second combustion chamber are located at below the first combustion chamber, and third combustion chamber is located at the first combustion chamber side, and third is burnt Room is connected to the second combustion chamber by pipeline；The straw charcoal that first combustion chambers burn generates falls to the second combustion under the effect of gravity Burn room, the first combustion chamber generate flue gas be volatized into the second combustion chamber (the first combustion chamber except in addition to the second combustion chamber, Remaining part position is sealing structure, and the flue gas of generation can only enter the second combustion chamber)；The flue gas and uncombusted that second combustion chamber generates Volatile matter enter third combustion chamber (so that flue gas and uncombusted volatile matter is entered third combustion chamber using air-introduced machine)；This hair The bright specific mode of communicating to three-level combustion chamber does not have particular/special requirement, can be realized above-mentioned combustion system.

In the present invention, the three-barreled inner cavity is cyclone structure, i.e. top is cylindrical shape, and lower part is circular cone Shape, similar to the cavity shape of cyclone dust collectors.

In the present invention, pretreated bundling stalk enters the progress first time burning of the first combustion chamber, and in the first combustion Burn room side wall fitted underneath once uniform wind；The excess air coefficient of first combustion chamber air distribution is preferably 0.8；Described first The ignition temperature of combustion chamber is preferably 600~800 DEG C, and more preferably 650~750 DEG C；Bundling stalk in the first combustion chamber into Half gasification, and combustion of row generates combustible gas (main component CO) and straw charcoal.

The combustible gas that first combustion chamber generates is fallen under the effect of gravity by being volatized into the second combustion chamber, straw charcoal Second combustion chamber, combustible gas and straw charcoal carry out second in the second combustion chamber and burn, in the second combustion chamber when burning for the second time Bottom is equipped with secondary uniform wind；The ignition temperature of second combustion chamber is preferably 900~1100 DEG C, and more preferably 1000 DEG C； Straw charcoal and combustible gas carry out full combustion in the second combustion chamber, generate flue gas and lime-ash.

The flue gas and uncombusted volatile matter that second combustion chamber generates enter third combustion chamber and carry out third time burning, and Whirl deposite tank three times is equipped at three-barreled smoke inlet, the flue gas that the second combustion chamber generates is revolved in third combustion chamber Stream burning makes wherein remaining combustible gas progress full combustion, while the cyclone structure of third combustion chamber itself will be taken in flue gas The particulate matter of band carries out preliminary dedirt；The present invention does not have particular/special requirement to three-barreled ignition temperature, according to specific operating condition It is configured.

The present invention preferably passes through air blower and aid distributing pipe and matches to the first combustion chamber, the second combustion chamber and third combustion chamber Wind.

The present invention carries out bundle burning using three-level air distribution combustion, and wherein three-level combustion chamber is relatively independent, bundling stalk successively into Half gasification, and combustion of row, the second-time burning of straw charcoal and volatile matter, volatile matter swirl flow combustion three times, bundling stalk may be implemented Efficiently, low nitrogen burning.

In the present invention, the second bottom of combustion chamber and third bottom of combustion chamber are preferably provided with slag cleaning device, the second burning The dust that the lime-ash and third combustion chamber that room generates generate falls to slag cleaning device, is discharged by slag cleaning device.

In the present invention, the heat generated in three-level air distribution combustion process passes to recirculated water by heat-exchange system, circulation Water carries out heat supply and (high efficient heat exchanging process) is applied in heating.In the present invention, heat-exchange system preferably includes: the first sidewall of combustion chamber It is water jacket samdwich with upper wall, recirculated water is transferred heat to by radiant heat transfer；Second combustion chamber top is circulating water pipe, is passed through Radiation and convective heat transfer transfer heat to recirculated water；Third sidewall of combustion chamber is water jacket samdwich, passes through radiation and convective heat transfer Transfer heat to recirculated water.In the present invention, the recirculated water after heat exchange preferably pass through aqueduct and radiator etc. be resident, Community, greenhouse or farm etc. carry out heat supply and heating.

In the present invention, the flue gas that third combustion chamber generates carries out dewatered drying to the pretreated bundling stalk of dedusting, It realizes residual heat recovery (flue gas reuse process)；The temperature for the flue gas that third combustion chamber generates is 200 DEG C, and the present invention is preferably by resistance to Flue gas is delivered at the bundling stalk after dedusting by high-temperature blower.

In the present invention, the flue gas after residual heat recovery discharges (fume purifying processes) after carrying out flue gas ash removal.In the present invention In, the method for the flue gas ash removal includes one or more of cyclone dust removal, water film dedusting and bag-type dust；Cigarette of the invention The purification method of gas is simple, can discharge after dedusting.

The concrete technology flow process of the efficient reuse straw bundle firing method of flue gas of the invention is as shown in Figure 1, wherein box 1 is bundle Pretreatment process is burnt, box 2 is multistage air distribution combustion process, and box 3 is high efficient heat exchanging process, and box 4 is flue gas reuse process, Box 5 is fume purifying processes.

Scheme provided by the invention is described in detail below with reference to embodiment, but they cannot be interpreted as pair The restriction of the scope of the present invention.