CN2339295Y

CN2339295Y - Conic fluidizing bed of floating screening plate

Info

Publication number: CN2339295Y
Application number: CN 98202152
Authority: CN
Inventors: 田原宇; 卢洪刚; 王立英
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-13
Filing date: 1998-03-13
Publication date: 1999-09-22
Anticipated expiration: 2008-03-13

Abstract

The utility model provides a conic fluidizing bed of a floating screening plate, which is formed by the coaxial series connection of a base of a floating screening plate bed, an upper expanding bed body, a transition section and an extension section from bottom to top. A fixed screening plate and a floating screening plate which is fixed on the fixed screening plate are arranged in a main air port of the base of the floating screening plate bed, and the floating screening plate is connected with the fixed screening plate by a delimited bolt. Side uyeres are arranged averagely on the outer wall of the base of the floating screening plate. The upper expanding bed body and the transition section are in tapered structures with different tapers. The gas in the fluidizing bed is distributed averagely. The fluidizing bed regulates aperture opening ratio by air flow automatically, expands stable operating range and reduces pressure. The upper expanding bed body makes a plurality of fluidized states of the fluidizing bed coexist. The fluidizing bed makes the pressure reduce again. Air speed is distributed reasonably. The fluidizing bed has strong internal circulation. Elutriation rate is reduced. The fluidizing bed avoids death bed and channel, improves transferring condition of heat and material, and has strong adaptability of raw material and production conditions.

Description

The sieve plate conical fluidized bed floats

The utility model relates to a kind of conical fluidized bed with the sieve plate that floats, and it is the improvement that belongs to fluid bed and spouted bed.

Fluidization technology is widely used in departments such as chemical industry, petrochemical industry, metallurgy, agricultural, environmental protection, be gas-solid, the solution-air two-phase is gentle-the solid-liquid three-phase reacts or a basic operation mode of contact heat transfer mass transfer, has huge realistic meaning and potential using value.In recent years, fluidization technology is more and more wider in various countries' range of application, and the key of fluidization technology is a fluid bed.The fluid bed that different mixing, heat and mass or reaction needed adapt with it.In industrial process such as the fluidized combustion of heavy oil or residual oil boiling bed hydrogenation, coal, granulation, crystallization, cereal drying, waste incineration, need in fluid bed, form circulation, improve heat and mass efficient or reaction efficiency.Existing ciculation fluidized attitude equipment mainly contains the fluidized bed reactor with internal circulation pump, spouted bed and external circulation fluidized bed etc., fluidized bed reactor heat and mass efficient height, solid catalyst utilization rate height, but internal circulation pump is fragile, influence the fluid bed long-term operation, and its complex structure, manufacturing cost height; Spouted bed accessory has strong interior circulation, heat and mass efficient height, but the elutriation rate is higher, only be applicable to bulky grain solid fluid bed, fluidized bed gas distributor percent opening is too little in addition, fluidisation attitude stabilization fluid desired gas pressure drop height, energy consumption is big, but percent opening is too big, and the pressure drop of fluidisation desired gas is little, easily forms channel or dead bed.Therefore, it is moderate to design a kind of gas distributor percent opening, need not internals can form in circulation, the elutriation rate is low, pressure drop is little, start-stop fluid bed easily, is that numerous scientific workers seek always.

The purpose of this utility model just is to avoid above-mentioned the deficiencies in the prior art part, and a kind of novel band sieve plate conical fluidized bed that floats is provided.

The purpose of this utility model is to realize like this, but it is mainly by at the bottom of the sieve plate floating bed, last expansion lathe bed, changeover portion, the extension is formed, it is characterized in that, but the gas distribution grid of float-valve type structure is equipped with at the main air port place at the bottom of the sieve plate floating bed, it is made up of a fixed screen deck and a unsteady sieve plate, two sieve plates have identical percent opening, position of opening staggers, float sieve plate last, and fixed screen deck connects together the two with limiting bolt down, but periphery is furnished with the crosswind mouth at the bottom of the sieve plate floating bed, the top connects one section upward expansion lathe bed at the bottom of the sieve plate floating bed, is changeover portion on it, and the extension is installed on the changeover portion.

But the utility model is owing to adopted at the bottom of the sieve plate floating bed, can make distribution of gas even, and with the automatic percent opening of regulating of air-flow size, guarantee that fluidized bed gas is evenly distributed, the stable operation expanded range, pressure drop reduces, air intake at the bottom of the bed is divided into main air port and crosswind mouth, the air intake of crosswind mouth can make superposeed shuttling movement on the horizontal plane of an interior material in the shuttling movement of vertical plane, thereby make a substrate material more active, and be tending towards even fluidisation, expansion lathe bed is designed to inverted cone-shaped structure on it, make the distribution of gas velocity up-small and down-big, little center, edge is big, centrophyten lifting zone and edge particle decline ring-shaped area have been formed, particle is done strong interior circulation between these two zones, in addition, gas speed distributes and makes the bottom of bed belong to the fast fluidized bed district again in this bed, and the middle part belongs to the turbulent flow fluidization regions, top and edge then belong to the bubbling fluidization district, improve the heat and mass condition, help improving transfer rate or reaction rate, and the low gas velocity bubbling area on top has reduced the particle entrainment amount of waste gas, it is the elutriation rate, the back taper lathe bed has supported the weight of a large amount of particles in addition, and initial fluidisation pressure drop reduces greatly, and start-stop is convenient.

Describe the concrete structure of foundation unsteady sieve plate conical fluidized bed provided by the utility model in detail below in conjunction with drawings and Examples.

Fig. 1 is the structural representation according to unsteady sieve plate conical fluidized bed provided by the utility model;

But Fig. 2 is according to the structural representation at the bottom of the sieve plate floating bed of unsteady sieve plate conical fluidized bed provided by the utility model.

But Fig. 3 is according to the vertical view at the bottom of the sieve plate floating bed of unsteady sieve plate conical fluidized bed provided by the utility model.

Among the figure, 1 is the extension, and 2 is changeover portion, and 3 is last expansion lathe bed, but 4 be the sieve plate floating bed at the bottom of, 5 are the sieve plate that floats, 6 be fixed screen deck, 7 are the qualification bolt, 8 is main air port, 9 is the crosswind mouth.

Can the float structure of conical fluidized bed of the sieve plate that the utility model proposed is to connect expansion lathe bed 3 in one section taper on 4 at the bottom of the conical bed, connect tapering transition section 2 on the last expansion lathe bed 3, the tapering difference of three pyramidal structures, connect extension 1 above the changeover portion 2, bed is installed at the bottom of the sieve plate bed that can float at main air port 8 places at the end 4, it is to be made of by limiting bolt 7 fixed screen deck 6 and a unsteady sieve plate 5, have the hole of equal number on fixed screen deck 6 and the unsteady sieve plate 5, be furnished with crosswind mouth 9 on the outer wall at the bed end 4.In the present embodiment, the tapering at the bed end 4 is 14 °, and the hole that respectively to have 30 diameters on float sieve plate 5 and the fixed screen deck 6 be 5mm limits bolts 7 with 4 and connects uniform 4 crosswind mouths 9 on the outer wall at an end 4.Divide two-layer installation, crosswind mouth 9 is angled with horizontal plane and bed end normal plane, and angle value can be determined according to formula.The tapering of last expansion lathe bed is 5 °, highly is 1000mm, and the tapering of changeover portion 2 is that 26 ° of height are 300mm, the caliber 500mm of extension 1.

Implement the unsteady sieve plate conical fluidized bed that the utility model proposed, have following advantage:

1. strong interior shuttling movement is arranged, solve a material bonding and automatically interior circulatory problems.

2. the gas distributor percent opening is regulated automatically, has guaranteed keeping moderate than atmosphere speed scope open interior rate, and fluid bed stable operation district enlarges.

3. distribution of gas is reasonable, multiple fluidisation attitude coexistence, and the elutriation rate is low, and pressure drop is little.

4. raw material and working condition there is very strong adaptability.

5. simple in structure, Operation and maintenance are all very convenient.

Claims

1. sieve plate conical fluidized bed that can float, form by (4), last expansion segment (3), changeover portion (2) and extension (1) coaxial from bottom to top being connected in series at the bottom of the sieve plate bed that can float, it is characterized in that (4) tapered structure is following young at the bottom of the sieve plate bed that can float, be main air port, install and fix sieve plate (6) and unsteady sieve plate (5) in it, the two connects by limiting bolt (7), and the sieve plate (5) that floats is last, fixed screen deck (6) is being descended, the uniform crosswind mouth of outer wall (9) of the bed end (4).

2. fluid bed according to claim 1 is characterized in that, all have the hole of equal number and size on float sieve plate (5) and the fixed screen deck (6), and perforate is staggered.

3. fluid bed according to claim 1 is characterized in that, said upward expansion lathe bed (3) is an inverted cone-shaped structure, and tapering is 4 °-10 °.

4. fluid bed according to claim 1 is characterized in that said changeover portion (2) is pyramidal structure, and tapering is 20 °-50 °, and its heavy caliber end is connected with the extension of straight tube shape.