CN102745925A

CN102745925A - Rotary kiln for ardealite calcination

Info

Publication number: CN102745925A
Application number: CN2012102523014A
Authority: CN
Inventors: 顾潘
Original assignee: Xifeng Jielang Building Material Development Co Ltd
Current assignee: Xifeng Jielang Building Material Development Co Ltd
Priority date: 2012-07-20
Filing date: 2012-07-20
Publication date: 2012-10-24
Anticipated expiration: 2032-07-20
Also published as: CN102745925B

Abstract

A rotary kiln for ardealite calcination comprises a kiln, a rotary kiln cylinder and an electrostatic precipitator. The rotary kiln cylinder is disposed in the center of the kiln, one end of the kiln is provided with a combustion chamber, the top of the kiln is provided with three partition walls and two flame retaining walls, and the bottom of the kiln is provided with two lower partition walls and three lower flame retaining walls and partitioned into six dust chambers, a high-temperature area, a medium-temperature area and a constant-temperature area. Flue gas fire pipes are uniformly distributed on the inner wall of the rotary kiln cylinder, one end of the rotary kiln cylinder is provided with a hot flue gas inlet while the other end of the rotary kiln cylinder is provided with an outlet, the hot gas inlet and the outlet are respectively communicated with the flue gas fire pipes, and an annular gas collection hood is arranged at the outlet end. Heat can be fully used by means of combination of a furnace in fluid bed and the rotary kiln, the contact surface of the ardealite with the flue gas fire pipes can be widened, and a function of turning materials is achieved. Further, the ardealite does not contact with flue gas, so that product quality and whiteness are guaranteed, and energy is saved while environment requirements on flue gas and dust are met.

Description

The revolution stove of calcined phosphogypsum

Technical field

The present invention relates to the rotary kiln field of mechanical technique, relate in particular to the revolution stove of calcined phosphogypsum.

Background technology

Existing outer burning formula rotary kiln is the rotary kiln of indirect heating, and the thermo-efficiency of outer burning formula rotary kiln is lower, is merely 28-35%, and actual energy consumption is (18.4-20.9) * 10 ⁵KJ/t plaster of Paris per ton amounts to power consumption every kilogram of 400-500kca; The burning of tradition rotary kiln has a plurality of fire doors, uses raw coal without pulverizing respectively, directly in fire grate, burns, and each combustion zone temperature all is about 800 ℃; Raw coal fails fully to burn, and causes waste, and whole kiln temperature is the same, causes the phosphogypsum unstable product quality easily; Burning or living excessively, wayward takes place, and whole rotary kiln furnace wall all is the combustion zone, and soot dust has no idea to handle; Directly discharge, cause environmental pollution, do not reach environmental requirement, to above-mentioned defective fluidizing furnace is combined both to reach with rotary kiln and economize on coal through chimney; Make full use of heat again,, reach environmental requirement through cyclone dust removal.

Summary of the invention

The revolution stove that the purpose of this invention is to provide the high calcined phosphogypsum of a kind of energy-conserving and environment-protective thermo-efficiency, its structure is formed and is comprised stove, rotary kiln tube, electrostatic precipitator three parts, and the length of the calcining baking zone of the length of stove and rotary kiln tube is consistent; Be the rectangle body of heater, rotary kiln tube two ends are provided with the support support roller, and feed end is provided with arm revolving gear; By step-down gear and driven by motor; Cylindrical shell is horizontally set on stove central authorities in the middle of the rotary kiln tube, and the feed end of stove is provided with the combustion chamber, and combustion chamber bottom is fire grate and air compartment, gas blower, scum pipe; The top of stove is provided with three road partition walls; Be respectively high-temperature zone partition wall, middle warm area partition wall, the flat-temperature zone partition wall, also be provided with between the three road partition walls two channel ratio partition walls short on firebreak; The stove bottom is provided with partition wall under the twice, is respectively partition wall under the medium and high temperature, partition wall under the middle constant temperature; Be respectively equipped with the three roads short following firebreak of partition wall down between the twice partition wall; Stove bottom is separated into six settling pockets, makes to be able to sedimentation than meal dirt in the hot flue gas of incendiary, the inwall of rotary kiln tube is provided with into the flue gas fire tube of circumference uniform distribution; Offer hot gas approach and outlet on the discharge end cylindrical shell circumference of rotary kiln tube; And be connected respectively with the set flue gas fire tube two ends of rotary kiln tube inwall, the feed end excircle of rotary kiln tube is provided with annular gas skirt, with the hot exhanst gas outlet centralized collection of establishing on the rotary kiln cylindrical shell feed end cylindrical; Through the exhanst gas outlet of annular gas skirt, be connected with the gas approach of electrostatic precipitator through smoke induced draught fan and tail pipe again.Electrostatic precipitator be one bind columnar structured; Excircle is provided with thermal insulation layer; Inner peripheral wall is provided with equally distributed electrode bar; Flue gas is introduced through central duct from lower sides and is got into the dedusting chamber through the upper end through the electrode bar electrostatic precipitation, and the flue gas after dedusting is connected with induced draft fan through exhanst gas outlet and enters chimney flue gas from the smoke outlet tube bottom; The electrostatic precipitator lower end is provided with screw feeder dust collection is discharged.

Adopt the beneficial effect of present technique scheme: fluidizing furnace is combined with rotary kiln; Can make full use of heat; Increase the contact surface of phosphogypsum and rotary kiln pyrotechnics pipe, and play the effect of upset material, phosphogypsum does not contact with flue gas; Guarantee the quality and the whiteness of product, not only practiced thrift the energy but also reached the environmental requirement of exhaust gas dust.

Description of drawings

Fig. 1 is the revolution stove overall structure synoptic diagram of calcined phosphogypsum of the present invention.

Fig. 2 a is the cross-sectional view of revolution stove.

Fig. 2 b is the cross section structure synoptic diagram of Fig. 2 a.

Fig. 3 a is the cross-sectional view of rotary kiln tube.

Fig. 3 b is annular gas skirt schematic cross section.

Fig. 4 a is the electrostatic precipitator cross-sectional view.

Fig. 4 b is the cross-sectional structural representation of Fig. 4 a.

Among the figure: the 1-stove; The 2-wall with flues that performs; 2.1-partition wall on the high-temperature zone; 2.2-partition wall on the middle warm area; 2.3-partition wall on the flat-temperature zone; Firebreak under the 3-; 3.1-partition wall under the middle high temperature; 3.2-in; Partition wall under the flat-temperature zone; The 4-combustion zone; The 5-air compartment; The 6-gas blower; The 7-scum pipe; 8-rotary kiln tube; The hot gas approach of 9-; The 10-exhanst gas outlet; The 11-airduct; 12-flue gas fire tube; 13-annular gas skirt; 14-dedusting flue gas inlet tube; 15-dedusting smoke outlet tube; The 16-thermal insulation layer; The 17-screw feeder; The 18-electrode bar.

Embodiment

The embodiment of the revolution stove of calcined phosphogypsum of the present invention, the contrast accompanying drawing is further explained:

Its structure is formed and is comprised: stove 1, rotary kiln tube 8, electrostatic precipitator three parts, and the length of stove 1 is consistent with the working district length of rotary kiln tube, and stove 1 is shaped as a rectangle kiln body, is built into by brick and refractory materials; The calcining baking zone promptly is divided into high temperature, middle temperature, three districts of constant temperature, and rotary kiln tube two ends are provided with the support support roller; Feed end is provided with gear, and by step-down gear and driven by motor rotation, heating zone is flat in the middle of the rotary kiln tube 8 crouches in stove 1 central authorities; The feed end of stove 1 is provided with combustion chamber 4, and the combustion chamber is for 4 times fire grate and air compartment 5, gas blower 6 and scum pipe 7, and the top of stove 1 is provided with three road partition walls; Be respectively partition wall 2.1 on the high-temperature zone; In partition wall 2.2 on the warm area, partition wall 2.3 on the flat-temperature zone, be provided with between the partition wall on three roads twice than three roads on partition wall short on firebreak 2; The stove bottom is provided with partition wall under the twice; Be respectively partition wall 3.1 under the high temperature, partition wall 3.2 under the middle constant temperature, are respectively equipped with the three roads short following firebreak 3 of partition wall down under the twice between the partition wall; The stove bottom is separated into six dust chambers; The inwall of rotary kiln tube 8 is provided with into the flue gas fire tube 12 of circumference uniform distribution, offers hot gas approach 9 on the stove inner barrel circumference of rotary kiln tube 8 discharge ends, and is connected respectively with flue gas fire tube 12 that rotary kiln tube inwall is established; The other end circumference of rotary kiln tube 8 is provided with exhanst gas outlet 10 and annular gas skirt 13, and the exhanst gas outlet of annular gas skirt 13 links with the flue gas inlet tube 14 of electrostatic precipitator through induced draft fan, tail pipe.The moisture that rotary kiln tube 8 end faces produce when being provided with tracheae 11 calcinings is discharged through pipeline 11.

Electrostatic precipitator is the round shape that binds; The cylindrical shell excircle is provided with thermal insulation layer 16; Inwall is provided with the electrode bar 18 of circumference uniform distribution; Flue gas is introduced the central duct upper end from the lower sides pipeline and is got into the dedusting chamber through electrode bar 18 electrostatic precipitations, and flue gas is connected the entering chimney and discharges with induced draft fan from dedusting smoke outlet tube 15 bottoms.

The electrostatic precipitator lower end is provided with the ash bucket outlet, and ash bucket outlet below is provided with screw feeder 17 dust collection is carried discharge.

Claims

1. the revolution stove of a calcined phosphogypsum; It is characterized in that: its structure is formed and is comprised stove (1), rotary kiln tube (8), electrostatic precipitator three parts; Stove (1) is a rectangle furnace kiln body, and rotary kiln tube (8) heating zone is flat to crouch in stove (1) central authorities, and the feed end of stove (1) is provided with combustion chamber (4); Combustion chamber (4) is fire grate and air compartment (5), gas blower (6) and scum pipe (7) down; Stove (1) top is provided with partition wall (2.1) on the partition wall high-temperature zone, three roads, partition wall on the middle warm area (2.2), firebreak (2) on partition wall on the flat-temperature zone (2.3) and the twice; Partition wall (3.1) under the high temperature during stove (1) bottom is provided with, firebreak (3) is separated into six dust chambers with stove (1) bottom under partition wall under the middle constant temperature (3.2) and three roads; Rotary kiln tube (8) inwall is provided with the flue gas fire tube (12) of circumference uniform distribution; Offer hot gas approach (9) on rotary kiln tube (8) the discharge end stove inner barrel circumference and be communicated with respectively with flue gas fire tube (12) that rotary kiln tube (8) inwall is established; Rotary kiln tube (8) the other end barrel is provided with exhanst gas outlet (10) and annular gas skirt (13); The exhanst gas outlet of annular gas skirt (13) is connected with the flue gas inlet tube (14) of electrostatic precipitator through induced draft fan, tail pipe, and rotary kiln tube (8) end face is provided with tracheae (11).

2. according to the revolution stove of the calcined phosphogypsum of claim 1; It is characterized in that: described stove (1) top three road partition walls are respectively partition wall on the high-temperature zone (2.1); Partition wall (2.2) on the middle warm area, firebreak (2) on partition wall on the flat-temperature zone (2.3) and the twice, stove (1) bottom is provided with partition wall under the twice medium and high temperature (3.1); In, firebreak (3) under partition wall (3.2) and three roads under the constant temperature, stove is calcined baking zone is divided into high temperature, middle temperature, three districts of constant temperature.

3. according to the revolution stove of the calcined phosphogypsum of claim 1 or 2; It is characterized in that: firebreak (2) is provided with short than top three road partition walls on the twice of described stove top; Be partition wall on the high-temperature zone (2.1); Partition wall (2.2) on the middle warm area, partition wall on the flat-temperature zone (2.3) is short than firebreak (2); Under three roads of stove bottom firebreak (3) than partition wall under the high-temperature zone in the twice (3.1), in, partition wall (3.2) is short under the flat-temperature zone.

4. according to the revolution stove of the calcined phosphogypsum of claim 1, it is characterized in that: described electrostatic precipitator comprises the cylindrical drum that binds; Excircle is provided with thermal insulation layer (16), inwall circumference uniform distribution electrode bar (18); Flue gas is introduced central duct from the lower sides pipeline; The upper end gets into the dedusting chamber, through electrode bar (8) electrostatic precipitation, flue gas, is connected with induced draft fan from dedusting smoke outlet tube (15); The lower end is provided with the ash bucket outlet, and ash bucket outlet below is provided with screw feeder (17) with dust collection.