CN2544237Y

CN2544237Y - Coal slurry combustion energy-saving flame-reversing kiln

Info

Publication number: CN2544237Y
Application number: CN 02237889
Authority: CN
Inventors: 郑凤才; 金坚; 姜鸿安; 赵德山; 蒋宏利
Original assignee: BEIJING ZHONGKE UNIVERSAL ENERGY ENVIRONMENTAL PROTECTION Co Ltd
Current assignee: BEIJING ZHONGKE UNIVERSAL ENERGY ENVIRONMENTAL PROTECTION Co Ltd
Priority date: 2002-06-11
Filing date: 2002-06-11
Publication date: 2003-04-09
Anticipated expiration: 2012-06-11

Abstract

An energy-saving down-draft kiln burning coal paste has an inner cavity, in which a burned product is preheated and heated. A bottom part of the inner cavity has a smoke exhaust fire-retardant brick hollow, a central part of the inner cavity is provided with a disassembly and assembly door and fire-retardant materials are laid around the inner cavity. A nozzle of burning coal paste and an air-supply line of combustion air are uniformly laid out inside burning rooms around the inner cavity and refractory materials and thermal insulation materials are laid out around the burning rooms. The nozzle of burning coal paste slightly slopes downwards, a fire barrier at the front of the nozzle is formed and whirl is formed when burning coal paste; A lucarne is arranged on a top part of the inner cavity; a shell body of a kiln cavity is constituted by refractory materials, thermal insulation materials and fixing components; a smoke flue is arranged under the bottom part of the inner cavity, of which a rear part is provided with an air preheater, the smoke flue at a rear part of the air preheater is led to a chimney. When burning high-temperature burned products, a cover body can be put in the inner cavity of the utility model, smoke inlet and outlet holes are arranged on two sides of the cover body, the hole used for preheating and heating burned materials with clean and high-temperature smoke is connected with a bypass flue out of the kiln; a center of the bypass flue is provided with a regulating sluice gate.

Description

The energy-conservation down-draft kiln of burning coal slurry

Technical field

The utility model relates to a kind of down-draft kiln of firing refractory material, belongs to the technical field of Industrial Stoves.

Background technology

Down-draft kiln is a Thermal Equipment of firing refractory material, simple in structure because of having, fire flexibly, the advantage of small investment, it is used widely aspect firing at refractory material, particularly in part rural area, small towns, become local pillar industry.But because it adopts hand to give fuel (coal), natural air feed, fuel (coal) burns on siege, has the imperfect combustion phenomenon, and Dark smoke billows during firing refractory material, causes the severe contamination to local atmospheric environment.Simultaneously, the flue gas that down-draft kiln is discharged is up to more than 800 ℃, and a large amount of heats that coal combustion is emitted are wasted, and heat utilization ratio is below 50%, therefore the traditional combustion mode of down-draft kiln has caused the environmental pollution and the wasting of resources to the locality, becomes the bottleneck that local economy reaches a new stage.

Summary of the invention

The utility model provides a kind of energy-conservation down-draft kiln that uses coal slurry, the combustible liquid that its fuel adopts coal slurry one to have certain stability to flow, it can substitute fuel such as kiln fire coal, oil, gas, not only administering on the kiln smoke contamination difficult problem, effect with unique energy-conserving and environment-protective, and in dedusting, desulfurization, the low CO discharging of low NOx, and aspect such as dirt slag recycling all demonstrates the advantage of Cheap highly effective.

The technical solution of the utility model provides like this: a kind of energy-conservation down-draft kiln of the coal slurry that burns, it is characterized in that: a kiln inner chamber, it comprises that the bottom is useful on the refractory brick hole of discharging flue gas, the middle part has handling door-be used to fire putting into and taking out of material, be laid with kiln body refractory material all around, the nozzle of burning coal slurry and combustion air blast pipe are evenly arranged in the inner chamber combustion chamber all around, be furnished with refractory material and insulation material around the combustion chamber, be used for improving the burning indoor temperature, guarantee the smooth combustion of coal slurry, the coal slurry nozzle is slightly downward-sloping, and the front of nozzle is provided with firebreak, form eddy flow at this flame, in order to ash content in minute separable flue gas; The top of inner chamber has the skylight; Kiln chamber enclosure body is made up of refractory material, insulation material, retaining piece; Exhaust gases passes be arranged in intracavity bottom below, the rear portion of exhaust gases passes is provided with air preheater-be used for the heat recovery of high-temperature flue gas, air preheater rear portion flue leads to chimney always; When firing the high-temperature firing product, can also be placed with cover body in its chamber, be used to isolate ash-laden gas and fire contacting of material, the cover body both sides have the flue gas manhole appendix, manhole appendix links to each other with the by-pass flue that goes out kiln, is used for clean high-temperature flue gas and comes preheating, heating to fire material; Regulating gate is arranged in the middle of by-pass flue.

In the such scheme, described fuel is coal slurry, and coal slurry water, sewage or black liquor and coal dust, additive mix, and are formed with the combustible liquid that certain stability can flow, and the shared ratio of coal weight is 60～70%; Coal slurry mixes with oil and coal dust, additive, and the shared ratio of coal weight is 50%.

In the such scheme, described air preheater adds about hot-air to 400 ℃, improves that cavity temperature is more than 200 ℃ in the kiln, and air preheater place flue-gas temperature can drop to below 600 ℃.

Energy-conservation down-draft kiln of the present utility model compared with prior art has the following advantages:

1, coal combustion is replaced by coal slurry, and burning has environment protecting fully, and especially its environment protecting is better when using the coal slurry of sewage or black liquor preparation, and mixed economy and social benefit are higher; The combustion rate of coal slurry reaches 98%, compares with the hand coal combustion, and efficiency of combustion has improved more than 10%.

2, the UTILIZATION OF VESIDUAL HEAT IN of air preheater with the afterbody high-temperature flue gas is installed, makes the kiln heat utilization efficiency improve more than 20%.

Comprehensive above-mentioned

advantage

1 and 2 is promptly obtaining under the condition of identical practical heat, and every kiln can be saved coal about 30%, significantly reduces fuel quantity, and its energy-saving effect is fairly obvious.

3, during the combustion high temperature burned product, the kiln cavity arrangements has cover body that burned product and ash-laden gas are isolated, the ash that prevents high-temperature flue gas bonds on burned product, influence the quality of burned product, also draw simultaneously and deliver in the cover body from the back-end ductwork flue gas that part is clean, burned product in the heating cover body reduces because the isolation of cover body causes long situation of burned product preheating, heat time heating time.

4, after the air preheat, can improve ignition temperature, shorten firing time.

5, in place with good conditionsi, can use waste water, black liquor or the waste residue handled a little, can reduce the use amount of good water in the coal slurry production on the one hand; Make waste water reclaiming on the other hand again, played the effect of administering waste water, waste liquid, waste residue, reach the purpose of waste gas, waste water, the waste residue comprehensive regulation.

Description of drawings

Accompanying drawing is the structural representation that uses the energy-conservation down-draft kiln of coal slurry.

The specific embodiment

Below in conjunction with drawings and Examples, be described in detail the utility model.

Enter nozzle 1 after the coal slurry pressurization, downward-sloping burning after atomizing in the combustion chamber, flame is met firebreak 2 back rotations and is upwards entered kiln inner chamber 9, the heating burned product, flue gas is drawn by bottom flue 10 then, behind air preheater 8 heating combustion airs, discharges via chimney.When firing high-temperature refractory, burned product is placed in the cover body 4, enter the bigger flue gas of dust burdening in the kiln chamber to completely cut off, can prevent that ash bonds in the high-temperature flue gas on burned product, invade that avoid causing to firing the pollution of material, flue gas is before entering air preheater 8, some is drawn out of by by-pass flue 5 and enters in the cover body, be expelled to flue collector by by-pass flue 7 behind the heating burned product, be furnished with gate 6 between the by-

pass flue

5 and 7, discharge through air preheater 8 and chimney then.

Its required combustion air enters air preheater 8 and is heated by flue gas after air blast pressurization, then through blast pipe 3, enters in the combustion chamber, provides the coal slurry burning required.

Claims

1, a kind of energy-conservation down-draft kiln of the coal slurry that burns, it is characterized in that: a kiln inner chamber, it comprises that the bottom is useful on the refractory brick hole of discharging flue gas, the middle part has handling door, is laid with kiln body refractory material all around, and the nozzle of burning coal slurry and combustion air blast pipe are evenly arranged in the inner chamber combustion chamber all around, be furnished with refractory material and insulation material around the combustion chamber, the coal slurry nozzle is slightly downward-sloping, and the front of nozzle is provided with firebreak, forms eddy flow at this flame; The top of inner chamber has the skylight; Kiln chamber enclosure body is made up of refractory material, insulation material, retaining piece; Exhaust gases passes be arranged in intracavity bottom below, the rear portion of exhaust gases passes is provided with air preheater, air preheater rear portion flue leads to chimney always; When firing the high-temperature firing product, also be placed with cover body in its chamber, the cover body both sides have the flue gas manhole appendix, and manhole appendix links to each other with the by-pass flue that goes out kiln; Regulating gate is arranged in the middle of by-pass flue.

2, according to the energy-conservation down-draft kiln of the described burning coal slurry of claim 1, it is characterized in that: its fuel is coal slurry, and coal slurry water, sewage or black liquor and coal dust, additive mix, and the shared ratio of coal weight is 60～70%; Coal slurry mixes with oil and coal dust, additive, and the shared ratio of coal weight is 50%.

3, according to the energy-conservation down-draft kiln of the described burning coal slurry of claim 1, it is characterized in that: its air preheater adds hot-air to 400 ℃, improves that cavity temperature is more than 200 ℃ in the kiln, and air preheater place flue-gas temperature can drop to below 600 ℃.