CN200965414Y - An air duct thermal insulating equipment for carbon incineration and rotary kiln - Google Patents

Abstract

The utility model relates to a heat insulation device used for an air-supplying tube used in a carbon clacined circumey-gated kiln, mainly comprising an iron-mat, a casting material and an anchoring nail, wherein the utility model appears as a hollow semi-column. The iron-mat is arranged on the inner wall, and a T-type or a V-type anchoring nail is welded every 30mm on one side on the iron mat embedding the insulation prefab block. And an outward penetrating semi-round ring two and a semi-round inward groove two which are corresponding with each other are arranged on two end faces of the combined insulation prefab block, and an outward penetrating semi-round ring one and a semi-round inward groove one which are corresponding with each other are arranged on the side face of the combined insulation prefab block. The construction of the device is convenient and the service life is long, and the insulation effect is better, and the quality can not be influenced by the baking curve.

Description

A kind of wind-supplying pipe heat insulation device inside carbon element calcining rotary kiln

Technical field

The utility model belongs to the carbon calcining rotary kiln apparatus field, relates to the refractory material application technology simultaneously.Be mainly used in the thermal insulation protection of air supply line in the carbon calcining rotary kiln kiln, also can be used for the thermal insulation protection of similar other Thermal Equipment.

Background technology

Rotary kiln is as a kind of important Thermal Equipment, obtain using very widely at industrial circles such as lime calcining, cement, reduction sintered ore, burning industrial pollutants, corresponding Thermal Equipment with other is compared, and it has better material adaptability and higher heat energy utilization rate.Yet use it for calcined petroleum coke, start late in China, the production history that two more than ten years were only arranged, its design mainly is according to external same category of device, with the stove brickwork, this often not too adapts to domestic material characteristic and workman's practical operation level, thereby compares with international same category of device, no matter aspect production efficiency, energy consumption index, still when all there is bigger gap aspect the service life of equipment in output.The position, the temperature of burning zone and the length of burning zone that studies show that burning zone in the rotary kiln play critical effect to calcined petroleum coke end product quality, production efficiency and casting yield thereof.And these thermal technology's factors mainly are to control by the position and the wind supply quantity of air feed pipe, the air feed system of being made up of air blast and air feed pipe is installed on the kiln body, rotate synchronously with rotary kiln aborning, the air supply line that gos deep into part in the kiln can periodically be subjected to periodic impact of material and friction in the kiln aborning, the zone of adding its place just is the high-temperature region in the kiln, thereby need wrap up certain thickness refractory material at its outer wall and be used for heat insulation, thereby make the air feed pipe in kiln, can keep lower temperature, and be unlikely to occur oxidation and scaling loss, also can resist the impact and the friction of material simultaneously.Existing wrapping technology generally is to smear certain thickness castable refractory after the outer wall of air feed pipe adds the anchor studs of welding some, this wrapping method has following shortcoming: on the one hand for the new kiln of just having built up, in baking kiln process, baking kiln curve mainly is to formulate according to the character and the characteristics of kiln body refractory material, and near heating curve the air feed pipe and the required heating curve of air feed pipe wrapping material are difficult to coincide, thereby make its serviceability be difficult to guarantee; On the other hand for the rotary kiln that waters because of air feed pipe wrapping after the material feeding local shedding is repaired, can not spend long time and water the required baking curve of material feeding according to wrapping it is toasted.Owing to making, the reason of above two aspects becomes very short the service life of air feed pipe, do not match with the time between overhauls(TBO) of kiln body, just opened kiln soon often, one or a few air feed pipe is just burnt out, in order not influence production, the air feed pipe of having to burn out blocks from the outside, makes it lose the air feed function, its result has caused the wretched insufficiency of wind supply quantity in the kiln, and this will cause great influence to forging the burnt quality in back.The stop production to overhaul of having to when serious, thus had a strong impact on the output of rotary kiln.

The utility model content

Weak point at carbon current element calcining rotary kiln wind-supplying pipe heat insulation technology, a kind of wind-supplying pipe heat insulation device inside carbon element calcining rotary kiln of the utility model is not toasted the effectively insulating equipment of curve restriction for carbon calcining rotary kiln air feed pipe provides a kind of easy construction, long service life, good heat-insulation effect and quality.

Wind-supplying pipe heat insulation device of the present utility model be combined heat insulated wrapping layer mainly by parallels, water material feeding, anchor studs constitutes, and is hollow semi-cylindrical, inwall is provided with parallels.On parallels, go deep into the anchor studs of a side of heat insulation prefabricated section every T shape of 30mm welding or V-arrangement, in the both ends of the surface of combined heat insulated prefabricated section the evagination semicircular ring II and the ring-like inner groovy II of semicircle of mutual correspondence are set, an evagination semicircular ring I and ring-like inner groovy I of semicircle of mutual correspondence is set respectively on the side.Evagination semicircular ring II, evagination semicircular ring II shape are identical, and the ring-like inner groovy I of semicircle, evagination semicircular ring II shape are identical.

The preparation method of combined heat insulated wrapping layer is as follows.

Getting thickness is 3～4mm, material is the stainless-steel sheet of 1Cr18Ni9Ti, cut into the rectangle of suitable size according to the size of combined heat insulated wrapping layer, grow on the limit every 10～15mm in the both sides of rectangular steel plates then, be about opening about 10mm along cutting length on the direction vertical with long limit, upwards turn up along the bottom of opening then, and meet at right angles, be processed into the parallels of hollow semi-cylindrical as shown in drawings subsequently with the base.Go deep into the anchoring piece of a side of heat insulation prefabricated section every T shape of 30mm welding or V-arrangement on parallels, the anchoring piece material is selected 1Cr18Ni9Ti for use, and length will reach 1/2～2/3 of combined heat insulated wrapping layer height.An evagination semicircular ring II and the ring-like inner groovy II of semicircle of mutual correspondence are set in the both ends of the surface of combined heat insulated prefabricated section, design corresponding mutually an evagination semicircular ring I and the ring-like inner groovy I of semicircle on the side respectively, the diameter of semicircular ring is 12～15mm, and ring-like inner groovy I of semicircle and the ring-like inner groovy II of semicircle are bigger slightly than evagination semicircular ring I and evagination semicircular ring II diameter.Whole heat insulation wrapping block length is about that 200～300mm is long, and internal diameter is decided according to the external diameter of wrapping air feed pipe, and the margin of tolerance gets 0～+ 0.8mm.Behind the good mould of shape fabricating according to combined heat insulated wrapping layer, to put into mould by the ready-made hardware of above step earlier, the good DGG-II that will mix then waters material feeding or other material feeding of watering with higher refractoriness is injected in the mould, in casting process, to ceaselessly shake mould, vibration frequency is 150～200 times/min, amplitude 2～3mm makes and waters material feeding ram-jolt as much as possible.After combined heat insulated wrapping layer is prefabricated, at first be placed on airing in the natural environment, in the airing process, will carry out wet curing 1 time every 2～3h, injection flow rate is advisable with the wetting material feeding surface of watering.Put into dryer then and rise to 120～150 ℃ with the programming rate of 1～2 ℃/min, insulation 14～20h, the programming rate with 30～40 ℃/h evenly rises to 750～850 ℃ again, and insulation 3～4h comes out of the stove then, and air cooling is to normal temperature.

The using method of combined heat insulated wrapping layer is as follows.

At first get and be installed on the air feed pipe of carbon calcining rotary kiln after two combined heat insulated wrapping layers that prepare make up up and down, to guarantee that in combination evagination semicircular ring II embeds among the ring-like inner groovy II of semicircle of the combined heat insulated wrapping layer of another piece, then along the outer rim of parallels with itself and firm the welding together of air feed pipe.Getting two combined heat insulated wrapping layers that combine up and down subsequently again pushes along the pipe range direction, the evagination semicircular ring I that guarantees these two combined binding pieces embeds among the ring-like inner groovy I of semicircle of preceding two combined heat insulated wrapping layers, and then along the outer rim of parallels with itself and firm the welding together of air feed pipe, thus and thus, the most whole air feed pipe gos deep into the interior part wrapping of kiln fully.

The wind-supplying pipe heat insulation method has following technical advantage in this rotary kiln:

(1) whole combined heat insulated wrapping layer is prefabricated, and burns till through high temperature, and wrapping layer is used to be watered material feeding finished bake process before wrapping layer is installed, thereby the restriction of not dried by the fire the kiln curve of its intensity and Practical Performance.

(2) between whole combined heat insulated wrapping layer and the air feed pipe by wrapping layer with parallels weld together, construction, change conveniently, and can guarantee firm and reliable connection between the two, wrapping layer difficult drop-off, the service life that can improve the air feed pipe greatly.

(3) anchor studs is welded on the parallels, and links to each other with the air feed pipe by parallels, and the cold wind that flows in the air feed pipe has certain cooling effect to anchor studs, can prolong the service life of anchor studs, prevents that wrapping layer from breaking, falling piece.

(4) semicircular ring and the semicircular ring inner groovy by projection is nested against one another between per two combined heat insulated wrapping layers, can prevent effectively that high-temperature furnace gas or flame from entering the slit between the wrapping layer, avoid air feed pipe hot-spot, thereby prolong the service life of air feed pipe in the kiln.

Description of drawings

Fig. 1 partly cuts open schematic diagram for combined heat insulated wrapping layer front view;

Fig. 2 is combined heat insulated wrapping layer vertical view schematic diagram.

Among the figure: 1 parallels, 2 water material feeding, 3 anchor studs, the ring-like inner groovy I of 4 semicircles, 5 evagination semicircular ring I, 6 evagination semicircular ring II, the ring-like inner groovy II of 7 semicircles.

The specific embodiment

Embodiment 1

Rotary kiln size φ 2.84 * 55m is used for calcined petroleum coke, rotating speed 2～3rmp/min, output 9～12t/h grog, wind supply quantity 16000～1700Nm ³/ h, a wind, the air feed ratio between secondary wind and the tertiary air is 2: 3: 5, the air feed pipe adopts the seamless steel pipe of φ 108 * 4mm, wind speed 45～55m/s in the pipe.Combined heat insulated wrapping layer mainly by parallels 1, water material feeding 2, anchor studs 3 constitutes, and is hollow semi-cylindrical, inwall is provided with parallels 1.On parallels 1, go deep into the anchoring piece 3 of a side of heat insulation prefabricated section every a T shape of 30mm welding, in the both ends of the surface of combined heat insulated prefabricated section the evagination semicircular ring II 6 and the ring-like inner groovy II 7 of semicircle of mutual correspondence are set, an evagination semicircular ring I 5 and ring-like inner groovy I 4 of semicircle of mutual correspondence is set respectively on the side.The size and the technical parameter of the heat insulation wrapping layer that adopts are: wrapping layer length 210mm, the radius that protrudes semicircular ring is R12 _{+ 0.00} ^{+ 1.00}, the radius of indent semicircular ring is R12 _-1.00 ^-0.00, the wrapping layer internal diameter is R54 _{+ 0.00} ^{+ 0.80}, external diameter is R114, and parallels thickness is got 3mm, and anchor studs length is 35mm, and refractory material selects for use the DGG-II type to water material feeding.

Behind the good mould of shape fabricating according to combined heat insulated wrapping layer, to put into mould by the ready-made hardware of above step earlier, the good DGG-II that will mix then waters material feeding or other material feeding 2 of watering with higher refractoriness is injected in the mould, in casting process, to ceaselessly shake mould, vibration frequency is 180 times/min, amplitude 2.5mm makes and waters material feeding ram-jolt as much as possible.After combined heat insulated wrapping layer is prefabricated, at first be placed on airing in the natural environment, in the airing process, carry out wet curing 1 time every 3h, injection flow rate is advisable with the wetting material feeding surface of watering, curing time is 2d, puts into dryer then and rises to 130 ℃ with the programming rate of 1.5 ℃/min, insulation 18h, programming rate with 35 ℃/h evenly rises to 800 ℃ again, insulation 3.5h comes out of the stove then, and air cooling is to normal temperature.

Subsequently with its assembling and be welded on the air feed pipe in this revolution, at first get and be installed on the air feed pipe of carbon calcining rotary kiln after two combined heat insulated wrapping layers that prepare make up up and down, to guarantee that in combination evagination semicircular ring II 6 embeds among the ring-like inner groovy II 7 of semicircle of the combined heat insulated wrapping layer of another pieces, then along the outer rim of parallels with itself and firm the welding together of air feed pipe.Getting two combined heat insulated wrapping layers that combine up and down subsequently again pushes along the pipe range direction, the evagination semicircular ring I 5 that guarantees these two combined binding pieces embeds among the ring-like inner groovy I 4 of semicircle of preceding two combined heat insulated wrapping layers, and then along the outer rim of parallels with itself and firm the welding together of air feed pipe, thus and thus, the most whole air feed pipe gos deep into the interior part wrapping of kiln fully.Under the ordinary production situation, used 14 months, and found when stopping the kiln maintenance that air feed tubulose condition was good, and do not find not burn phenomenon, the wrapping layer crack-free, fall the piece phenomenon.

Embodiment 2

Rotary kiln size φ 2.2 * 45m, deadweight 214.8t is used for calcined petroleum coke, rotating speed 3～4rmp/min, output 6～9t/h grog, wind supply quantity 14000～1500Nm ³/ h, a wind, the air feed ratio between secondary wind and the tertiary air is 1: 3: 6, the air feed pipe adopts the seamless steel pipe of φ 89 * 4.5mm, wind speed 40～45m/s in the pipe.Combined heat insulated wrapping layer by parallels 1, water material feeding 2, anchor studs 3 constitutes, and is hollow semi-cylindrical, inwall is provided with parallels 1.On parallels 1, go deep into the anchoring piece 3 of a side of heat insulation prefabricated section every a V-arrangement of 30mm welding, in the both ends of the surface of combined heat insulated prefabricated section the evagination semicircular ring II 6 and the ring-like inner groovy II 7 of semicircle of mutual correspondence are set, an evagination semicircular ring I 5 and ring-like inner groovy I 4 of semicircle of mutual correspondence is set respectively on the side.The size and the technical parameter of the heat insulation wrapping layer that adopts are: wrapping layer length 220mm, the radius that protrudes semicircular ring is R12 _{+ 0.00} ^{+ 1.00}, the radius of indent semicircular ring is R12 _-1.00 ^-0.00, the wrapping layer internal diameter is R44.5 _{+ 0.00} ^{+ 0.80}, external diameter is R74, and parallels thickness is got 3mm, and anchor studs length is 30mm, and refractory material selects for use the DGG-II type to water material feeding.

Behind the good mould of shape fabricating according to combined heat insulated wrapping layer, to put into mould by the ready-made hardware of above step earlier, the good DGG-II that will mix then waters material feeding or other material feeding 2 of watering with higher refractoriness is injected in the mould, in casting process, to ceaselessly shake mould, vibration frequency is 200 times/min, amplitude 2mm makes and waters material feeding ram-jolt as much as possible.After combined heat insulated wrapping layer is prefabricated, at first be placed on airing in the natural environment, in the airing process, carry out wet curing 1 time every 2.5h, injection flow rate is advisable with the wetting material feeding surface of watering, curing time is 2d, puts into dryer then and rises to 150 ℃ with the programming rate of 2 ℃/min, insulation 14h, programming rate with 40 ℃/h evenly rises to 850 ℃ again, insulation 3h comes out of the stove then, and air cooling is to normal temperature.

Subsequently it is assembled successively and is welded on the air feed pipe in this revolution, at first get and be installed on the air feed pipe of carbon calcining rotary kiln after two combined heat insulated wrapping layers that prepare make up up and down, to guarantee that in combination evagination semicircular ring II 6 embeds among the ring-like inner groovy II 7 of semicircle of the combined heat insulated wrapping layer of another pieces, then along the outer rim of parallels with itself and firm the welding together of air feed pipe.Getting two combined heat insulated wrapping layers that combine up and down subsequently again pushes along the pipe range direction, the evagination semicircular ring I 5 that guarantees these two combined binding pieces embeds among the ring-like inner groovy I 4 of semicircle of preceding two combined heat insulated wrapping layers, and then along the outer rim of parallels with itself and firm the welding together of air feed pipe, thus and thus, the most whole air feed pipe gos deep into the interior part wrapping of kiln fully.Used 12 months under the ordinary production situation, rotary kiln running in order.

Embodiment 3

Rotary kiln size φ 2.5 * 55m, deadweight 274.8t is used for calcined petroleum coke, rotating speed 3～4rmp/min, output 11～12t/h grog, wind supply quantity 17000～1800Nm ³/ h, a wind, the air feed ratio between secondary wind and the tertiary air is 1: 3: 6, the air feed pipe adopts the seamless steel pipe of φ 89 * 4.5mm, wind speed 450～55m/s in the pipe.Combined heat insulated wrapping layer by parallels 1, water material feeding 2, anchor studs 3 constitutes, and is hollow semi-cylindrical, inwall is provided with parallels 1.On parallels 1, go deep into the anchoring piece 3 of a side of heat insulation prefabricated section every a T shape of 30mm welding, in the both ends of the surface of combined heat insulated prefabricated section the evagination semicircular ring II 6 and the ring-like inner groovy II 7 of semicircle of mutual correspondence are set, an evagination semicircular ring I 5 and ring-like inner groovy I 4 of semicircle of mutual correspondence is set respectively on the side.The size and the technical parameter of the heat insulation wrapping layer that adopts are: wrapping layer length 250mm, the radius that protrudes semicircular ring is R12 _{+ 0.00} ^{+ 1.00}, the radius of indent semicircular ring is R12 _-1.00 ^-0.00, the wrapping layer internal diameter is R44.5 _{+ 0.00} ^{+ 0.80}, external diameter is R74, and parallels thickness is got 3mm, and anchor studs length is 33mm, and refractory material selects for use the DGG-II type to water material feeding.

Behind the good mould of shape fabricating according to combined heat insulated wrapping layer, to put into mould by the ready-made hardware of above step earlier, the good DGG-II that will mix then waters material feeding or other material feeding 2 of watering with higher refractoriness is injected in the mould, in casting process, to ceaselessly shake mould, vibration frequency is 150 times/min, amplitude 3mm makes and waters material feeding ram-jolt as much as possible.After combined heat insulated wrapping layer is prefabricated, at first be placed on airing in the natural environment, in the airing process, carry out wet curing 1 time every 3h, injection flow rate is advisable with the wetting material feeding surface of watering, and curing time is 2.5d, put into dryer then and rise to 120 ℃ with the programming rate of 1 ℃/min, insulation 20h, the programming rate with 30 ℃/h evenly rises to 750 ℃ again, insulation 4h, come out of the stove then, air cooling is to normal temperature.

Subsequently it is assembled successively and is welded on the air feed pipe in this revolution, at first get and be installed on the air feed pipe of carbon calcining rotary kiln after two combined heat insulated wrapping layers that prepare make up up and down, to guarantee that in combination evagination semicircular ring II 6 embeds among the ring-like inner groovy II 7 of semicircle of the combined heat insulated wrapping layer of another pieces, then along the outer rim of parallels with itself and firm the welding together of air feed pipe.Getting two combined heat insulated wrapping layers that combine up and down subsequently again pushes along the pipe range direction, the evagination semicircular ring I 5 that guarantees these two combined binding pieces embeds among the ring-like inner groovy I 4 of semicircle of preceding two combined heat insulated wrapping layers, and then along the outer rim of parallels with itself and firm the welding together of air feed pipe, thus and thus, the most whole air feed pipe gos deep into the interior part wrapping of kiln fully.Used 10 months under the ordinary production situation, rotary kiln running in order.

Claims (4)

1, a kind of wind-supplying pipe heat insulation device inside carbon element calcining rotary kiln, it is characterized in that by parallels, water material feeding, anchor studs constitutes, be hollow semi-cylindrical, inwall is provided with parallels, on parallels, go deep into the anchor studs of a side of heat insulation prefabricated section every T shape of 30mm welding or V-arrangement, in the both ends of the surface of combined heat insulated prefabricated section the evagination semicircular ring II and the ring-like inner groovy II of semicircle of mutual correspondence are set, an evagination semicircular ring I and ring-like inner groovy I of semicircle of mutual correspondence is set respectively on the side.

2,, it is characterized in that anchor studs length is 1/2～2/3 of combined heat insulated wrapping layer height according to the described wind-supplying pipe heat insulation device inside carbon element calcining rotary kiln of claim 1.

3, according to the described wind-supplying pipe heat insulation device inside carbon element calcining rotary kiln of claim 1, the diameter that it is characterized in that semicircular ring is 12～15mm.

4,, it is characterized in that entire equipment is that heat insulation wrapping block length is 200～300mm according to the described wind-supplying pipe heat insulation device inside carbon element calcining rotary kiln of claim 1.

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