CN103438446A

CN103438446A - Sealed material returning valve with two-way material returning control function

Info

Publication number: CN103438446A
Application number: CN2013103937543A
Authority: CN
Inventors: 段伦博; 段元强; 陈晓平; 吴新; 赵长遂
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2013-09-02
Filing date: 2013-09-02
Publication date: 2013-12-11
Anticipated expiration: 2033-09-02
Also published as: CN103438446B

Abstract

The invention discloses a sealed material returning valve with a two-way material returning control function for a circulating fluidized bed. Ascending sections (2) which are positioned on the upper part of the sealed material returning valve are respectively arranged on two sides of a descending section (1); every two sections are separated through a separation plate; at least one overflow port (21) is formed in the top side wall of each ascending section (2); each overflow port (21) is connected with a material returning section (3); an air chamber (4) of an air distribution device is formed in the lower part of the sealed material returning valve and is provided with an air-cap-type air distribution plate (45); the lower part of the air distribution plate is partitioned into n independent air chambers (42) through separation plates; each independent air chamber (42) is connected with an air pipe (43) capable of independently controlling opening/closing and air quantity. By virtue of the sealed material returning valve, two-way material returning can be realized, and the material returning quantity of two sides is controlled in a certain range. The sealed material returning valve can be applied to double-fluidized-bed device systems, chemical chain combustion device systems and the like.

Description

A kind of sealing returning charge valve that can two-way control returning charge

Technical field

The present invention relates to a kind of sealing returning charge valve that can two-way control returning charge, belong to energy technology and mechanical engineering technology crossing domain.

Background technology

Combustion chamber, separator and solid material feeding-back device are the critical pieces that CFBB is different from the other types boiler, the basic task of loop back device is that the high-temperature solid particle that separator is separated is stably sent back in the combustion chamber that pressure is higher, and prevents that the gas anti-channeling from entering separator.

General volume control device can be divided into mechanical valve and the large class of on-mechanical valve two.The on-mechanical valve, without the effect of any extraneous mechanical force, only adopts the gas push Motion of solid particle, realizes under worst hot case simply, conveying solid material reliably.Due to on-mechanical valve movement-less part, so thereby it is simple in structure, flexible operation is widely used in CFBB.Loop seal is most widely used a kind of loopback of material device in CFBB at present, it is comprised of bubbling fluidized bed and the separator standpipe of a carry potential overflow pipe, a dividing plate is arranged between the two, bottom is connected by a horizontal segment, each section bottom is all with the air-distribution device of air distribution plate form, in order to pass into fluidized wind.The high-temperature material that separator is separated enters material returning device through standpipe, through horizontal segment, enters bubbling bed, and, under the fluidisation wind action, from overfall, flows out from bottom to top, flows into the returning charge section.

Normally used loop seal only can unidirectional returning charge, and in valve, aeration quantity is very little to the regulating action of solid particle flow, and valve is according to the pressure balance relation flow of balance solid particle automatically of self.But while in system, having two fluidized-bed reactors in parallel, as in burning chemistry chains technique or gasification-burning multi-production process, recycle stock need to be distributed between two reactors, at this moment just require the two-way returning charge simultaneously of returning charge valve, and each is controlled within the specific limits to the returning charge ratio, conventional sealing returning charge valve can't meet this requirement.In order to address the above problem, a kind of sealing returning charge valve that can two-way control returning charge is proposed.

Summary of the invention

Technical problem: the purpose of this invention is to provide a kind of sealing returning charge valve that can two-way control returning charge, the apparatus system such as that this returning charge valve can be applicable to is double-fluidized-bed, burning chemistry chains, can realize two-way returning charge, and control within the specific limits the returning charge amount of both sides.

Technical scheme: the sealing returning charge valve of two-way control returning charge of the present invention comprises: a vertical descending branch, two vertical ascent stages, the air compartment of bottom, and corresponding air-distribution device; The ascent stage that is positioned at described sealing returning charge valve top is arranged in the descending branch both sides, between each section, with dividing plate, separates, and at each ascent stage top sidewall, is provided with at least one overfall, and each overfall all has a returning charge section to be attached thereto; Described sealing returning charge valve bottom is provided with the air compartment of air-distribution device, and this air compartment is provided with hood-type grid plate, and the air distribution plate bottom is divided into n independent air compartment by dividing plate, and each independent air compartment is connected with one can independently control the airduct opened and closed with air quantity.

Described air compartment has n to prop up can independently to control the airduct opened and closed with air quantity to be attached thereto, and is connected with the vertical arm of m root on every branch wind pipe, and vertically the arm top is blast cap.

Airduct is low inside and high outside setting, with horizontal direction, is 30～45 degree angles.

Between airduct and vertical arm, by compensator, flexibly connected.

The descending branch airduct is all opened, make circulation ash material fluidisation and move to the both sides ascent stage, all or part of unlatching of both sides ascent stage airduct, make material stagnate local generation of ascent stage, and control the returning charge amount by overfall with this, reach the purpose of two-way control returning charge.

Beneficial effect: 1) sealing returning charge valve is by regulating airduct tolerance, can realize distribution, the adjusting to high-temp circulating ash and control, to meet the technological requirement of the system such as double-fluidized-bed to two-way returning charge, and can to both sides returning charge amount, be regulated according to the working conditions change of system;

2) sealing returning charge valve arrangement is simple, easy to operate, not easy to wear, and movement-less part, mechanical breakdown can not occur yet.

The accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

The schematic diagram that Fig. 2 is independent air compartment Apoplexy cap

Fig. 3 is for can independently controlling the air duct structure schematic diagram opened and closed with air quantity

Fig. 4 is structural representation of the present invention, basic identical with Fig. 1.

Fig. 5 be between vertical arm and airduct compensator flexibly connect schematic diagram

In figure, have: the air compartment 4 of vertical descending branch 1, vertical ascent stage 2, overfall 21, returning charge section 3, inner bottom part, blast cap 41, the air compartment 42 of independently cutting apart, airduct 43, vertical arm 44, hood-type grid plate 45.

The specific embodiment

Embodiment 1

Be embodiment 1 as shown in Figure 1,2 and 3, sealing returning charge valve that can two-way control returning charge, comprise that the air compartment 4 of a descending branch 1, two ascent stage 2 and bottom is connected with former three, and the material returning device main body is rectangular structure; The cross section of ascent stage 2 is rectangle, and returning charge section 3 is connected with the ascent stage 2 by overfall 21, and the overfall 21 of both sides ascent stage 2 is highly equal; Air compartment 4 adopts hood-type grid plate 45, and is divided into n independent air compartment 42 by dividing plate, and each independent air compartment 42 has the airduct 43 that can independently regulate air quantity to be attached thereto.

Recycle stock, from separator is separated, is delivered to descending branch 1 through standpipe, and under the fluidized wind effect that comes from blast cap 41, mobile to the ascent stage 2 of both sides, material produces fluidisation in the ascent stages 2, and enters returning charge section 3 by overfall 21; Fluidized wind is sent into independent air compartment 42 by the airduct 43 that can independently regulate air quantity, and through air distribution plate, from blast cap 41 ejections; The corresponding airduct 43-1 of descending branch 1 standard-sized sheet, make material to two side flow, the airduct 43-2 of ascent stages 2 correspondence partly opens, and makes material local stagnation of ascent stage 2, and, by regulating unlatching quantity and the air quantity of airduct 43, reach the purpose of controlling two-way returning charge amount.

Embodiment 2

Be embodiment 2 as shown in Figure 4,5, sealing returning charge valve that can two-way control returning charge, comprise that a descending branch 1, two ascent stage 2 is connected the air compartment 4 of three bottom with one, and the material returning device main body is rectangular structure; The cross section of ascent stage 2 is rectangle, and returning charge section 3 is connected with the ascent stage 2 by overfall 21, and the overfall 21 of both sides ascent stage 2 is highly equal; Air compartment 4 has n to prop up the airduct 43 that can independently regulate air quantity to be attached thereto, airduct 43 is 30～45 degree angles to discharge the leakage slag of blast cap with horizontal direction, be connected with the vertical arm 44 of m root on every branch wind pipe 43, vertically arm 44 tops are blast cap 41, and vertically arm 44 and 43 employing compensators of airduct are flexibly connected.

Recycle stock, from separator is separated, is delivered to descending branch 1 through standpipe, and under the fluidized wind effect that comes from blast cap 41, mobile to the ascent stage 2 of both sides, material produces fluidisation in the ascent stages 2, and enters returning charge section 3 by overfall 21; Fluidized wind is by airduct 43 and the connected vertical arm 44 that can independently regulate air quantity, from blast cap 41 ejections; The corresponding airduct 43-1 of descending branch 1 standard-sized sheet, make material to two side flow, the airduct 43-2 of ascent stages 2 correspondence partly opens, and makes material local stagnation of ascent stage 2, and, by regulating unlatching quantity and the air quantity of airduct 43, reach the purpose of controlling two-way returning charge amount.

Claims

One kind can two-way control returning charge sealing returning charge valve, it is characterized in that, sealing returning charge valve comprises: a vertical descending branch (1), two vertical ascent stages (2), the air compartment of bottom (4), and corresponding air-distribution device; The ascent stage (2) that is positioned at described sealing returning charge valve top is arranged in descending branch (1) both sides, between each section, with dividing plate, separate, be provided with at least one overfall (21) at each ascent stage (2) top sidewall, and each overfall (21) all there is a returning charge section (3) to be attached thereto; Described sealing returning charge valve bottom is provided with the air compartment (4) of air-distribution device, this air compartment (4) is provided with hood-type grid plate (45), the hood-type grid plate bottom is divided into n independent air compartment (42) by dividing plate, and each independent air compartment (42) is connected with one can independently control the airduct (43) opened and closed with air quantity.
2. a kind of sealing returning charge valve that can two-way control returning charge according to claim 1, it is characterized in that: described air compartment (4) has n to prop up can independently to control the airduct (43) opened and closed with air quantity to be attached thereto, be connected with the vertical arm of m root (44) on every branch wind pipe (43), vertically arm (44) top is blast cap (41).
3. by a kind of sealing returning charge valve that can two-way control returning charge claimed in claim 2, it is characterized in that, airduct (43) is low inside and high outside setting, with horizontal direction, is 30～45 degree angles.
4. by a kind of sealing returning charge valve that can two-way control returning charge claimed in claim 2, it is characterized in that, flexibly connected by compensator between airduct (43) and vertical arm (44).