SU1710967A1 - Rotating furnace - Google Patents

Abstract

The invention relates to construction materials, in particular, to the design of a furnace for the heat treatment of pre-granulated aluminosilicate raw materials in the production of expanded clay. The purpose of the invention is to increase productivity and reduce specific fuel consumption. For this, the rotary kiln contains a lined casing 1 with preheating and expansion zones in the form of cylindrical rigidly interconnected by means of a conical section 2. chesky sections 3, different diameter. The larger base of the cone of section 2 is directed in the direction of movement of the material and is located at the junction of the preheating and expansion zones. The length of the conical section 2 is 0, 0.28 the length of the intumescent zone. The ratio of the diameters and lengths of the cylindrical sections of the zones of expansion and preheating is respectively (1,) and (0.65-1.05). 4 tab., 1 Il.

Description

,: B

3 I - / /

The invention relates to the field of building materials, in particular, to the design of a furnace for the heat treatment of pre-granulated aluminosilicate raw materials in the production of expanded clay.

The purpose of the invention is to increase productivity and reduce specific fuel consumption.

The drawing shows a rotary kiln, longitudinal section.

The rotary kiln contains a lined body 1 with preheating and expansion zones in the form of two cylindrical sections 3 and k of different diameters rigidly interconnected by means of a conical section 2. The rotation of the furnace is carried out by the drive 5, the heat treatment of the material by the burner 6.

In the conical section 2, the larger base of the cone is directed towards the movement of the material, while the conical section is placed with a large base at the junction of the preheating and expansion zones, the length of the conical section 2 is 0, 28 lengths of the k expansion zone. In this way, the ratio of the diameters and lengths of the cylindrical sections of the zones of expansion and preheating is respectively (1.05-1.30) and (0.65-1.05).

Rotating oven works as follows.

With a uniform rotation of the housing 1 and, accordingly, of unstable connected sections, the 2nd continuously loads into the cylindrical section 3 of a smaller diameter granulated material, which then passes successively through the conical section 2 (the section corresponding to sections 2 and 3 is an area preheating) and a cylindrical section k of larger diameter (expansion zone).

In the conical section 2, there is a continuous increase in the rate of movement of the material and, as a result, a decrease in the thickness of its layer, which allows the material to be quickly and evenly heated before swelling in section and. When moving material in the cylindrical section k, the thickness of its layer gradually increases due to the expansion of the granules and the relative decrease in the speed of their movement.

0

five

Q Ј

about

When the furnace is cut off (section 4 ends), the expanded pellets are unloaded.

The arrangement of the conical section in the preheating zone makes it possible to most effectively use the process of preparing the material for swelling.

In tab. Tables 1-3 show the results of experimental studies on an experimental laboratory furnace with movable conical and cylindrical sections.

In tab. Figure 1 shows the data on the effect of the ratio of the lengths of cylindrical sections with the ratio between large DJ and smaller diameters equal to 1.2 () 1.2.

As can be seen from the table. 1, decreasing the value of lL. lower than 0.65 leads to a decrease in furnace performance and a noticeable increase in fuel consumption. If this indicator is more than 1.05, there is a tendency to increase fuel consumption and decrease performance.

In tab. Figure 2 presents data regarding the appropriateness of the relationship between the length of the conical section and the length of the cylindrical section of larger diameter at a ratio.

From the presented data it can be seen that both in the case of exceeding 1K: $ 1 more than 0.28, and in case of its value less than 0.1 C, the bulk density of the claydite begins to increase.

In tab. Figure 3 shows the data reflecting the effect of the diameter ratio. cylindrical sections at 0.9.

From the data table. 3, it follows that the optimal ratio is Dg: DM 1, 05-1.30, since with less than 1.05 and more than 1.30 ratios over the totality of indicators (productivity and fuel consumption) the process of obtaining haydite becomes less effective.

In tab. k shows the comparative results of factory tests of rotary kilns, characterized by their design in accordance with the proposed technical solution and prototype.

Thus, the proposed design of the rotary kiln allows to achieve full and uniform heating of the granulated material before expansion, as well as optimally

mode of expansion, so that the furnace performance can be significantly increased with a significant reduction in the specific fuel consumption for heat treatment.

the large base of the cone in the direction of movement of the material, that is, so that, in order to increase productivity and reduce specific fuel consumption, the conic section with a large base is placed at the junction of the preheating and expansion zones secf about rmu l and h

The rotary kiln, mainly for the production of expanded clay, contains a 0.14-0.28 length of the lining body with a zone of expansion, and the ratio of the preheat and bulge diameters and the lengths of the cylindrical portions of the bottom in the form of cylindrical sections The swelling and preheating diameter, connected between in a, is respectively (1.05 is the conical section with direction-15 1.30) and (0.65-1.05).

Table 1

76

the large base of the cone in the direction of movement of the material, so that it is, with the aim of increasing productivity and reducing specific fuel consumption, the conical section with a large base is placed at the junction of the preheating and expansion zones

This means that the ratio of the diameters and lengths of the cylindrical sections of the expansion and preheating dams is a (1.05 1.30) and (0.65-1.05) ).

-0.28 zone lengths wearing the diameter of their donor areas is stressive (1.05.

Table 1

125 120 80

Note. 1 c g and 1 c m, respectively, the lengths of cylindrical sections of large smaller diameters. (Table 2

Bulk density of claydite, kg / m3

405 380 360 360 355 350 ЗМ 350 00

PRECAUTIONS. 1K and - respectively, the length of the conical and cylindrical sections of larger diameter.

T a b e c ia 3.

Indicators

The ratio of Jl, 05 JlytO lj5 fl, 20 J1,25 Jl, 30 fl, 35

Productivity,% 90 100 t20 130 HO 150 110 Specific fuel consumption, kg of conventional fuel / m3 of expanded clay 120 80 75 72

70 65 75 90

Note. Dg- and C - diameters respectively

cylindrical sections of larger and smaller diameters.

72

70

72

75

90100

HO 150 110

70 65 75 90

t

t

Known construction 13.2 97.3

t

 (in a)

t

The proposed design 18.8 69.7

Table 4

480

310

Claims (1)

Formula tions A rotary kiln, mainly for expanded clay production, containing a lined body with preheating and expansion zones 8 in the form of cylindrical sections of different diameters, interconnected by a conical section with the direction of the larger base of the cone in side of the movement of the material, with the exception of the fact that, in order to increase productivity and reduce specific fuel consumption, the conical section with a large base is placed at the junction of the preheating and expansion zones, for on the conic section is 0,14-0,28 buckling length of the zone, and the ratio of the diameters of 'the lengths of the cylindrical portions and buckling preheating zones are respectively (1,051,30) and (0,65-1,05). Table! I Indicators Indicator values by examples g ..2.1 ./: .. I..2.1J.1..L.1 6 | 7 J 8 | 9 | YU Ratio 1j; ^: 1ts.m Productivity,% Specific fuel consumption, kg of standard fuel / m ³ expanded clay 0.55 0.60 0.65 ' 0.7 0.8 0.9 1,0 1.05 1.10 1.15 125 ioo 120 130 140 145 140 110 100 120 100 Note. 1c g- and 1c, respectively, the length of the cylindrical sections of larger and smaller diameters. Table 2 13 Jo, 14 0.16'Jo, 18 j 0.20 ^ 0.22 Jo, 24 [o, 26 Jo, 28 jo, 29 Indicators 0.1 Bulk density of expanded clay, kg / m ³ 405 380 C. M 360 360 355 350 340 340 340 350 400 For example, e. 1 _k and fyj are the length of the conical and cylindrical sections of larger diameter, respectively. Table 3. Indicators The ratio of D ^: D _M 1,0 H ⁵ | ι; ΐ5 1.20 U5 j 1.30 J 1.35 Productivity,% Specific consumption 90 100 120 130 140 150 140 110 fuel, kg of standard fuel / m ³ expanded clay 120 80 75 72 70 65 75 90 Note. Dg · and D _M - respectively, the diameters of the cylindrical sections of larger and smaller diameters. 7 1710967 ⁸ Table 4 Process indicators Hourly production, m ³ / h Specific fuel consumption, kg of standard fuel / m ³ The bulk density of expanded clay, kg / m ³ Famous design 13.2 97.3 480 The cylindrical section is smaller than the diameter: length 1c. _m ⁱⁿ = 26.0 m diameter Od _m =. 2.5 m Conical section. (in the expansion zone) length 1 _K "3.5 m Larger diameter cylindrical section: length 1c.5 “= 10.5 m dirmeter D _{U (} j =. . “3.0 M. Attitude: 1χ ⁵ 1c. £ “0” 33 ”c. 5 ^: ° c ^. M ⁼ b20 Offered designs> 18.8 69.7 ZU Smaller diameter cylindrical section: Length 1c. _m "" 21.8 m, diameter O _{c m} =. = 2.5 m 'Conical section (in the pre-heating zone) length lg = 3.3 ^m Cylindrical section with a larger diameter:''length l _uS - = = 14.9 m diameter D ^ g- = “3.0 m Attitude: * 1 " ^: 1ts.5 '" 0.22 Est. ^ ^: D _{lJ | M} = 1.20 J-tA.fi ^: 1 | 4.Μ ⁼ 0 »6θ