Anti-corrosion device for cold air end of air preheater of solid waste circulating fluidized bed boiler

Abstract

The utility model discloses an anti-corrosion device for a cold air end of an air preheater of a solid waste circulating fluidized bed boiler, relates to the field of air preheaters of boilers, and aims to solve the problems that in the prior art, an air preheater pipeline of a tubular preheater is corroded at low temperature by an acidic compound formed by gas generated after fuel of a solid waste boiler is burnt and water vapor; the heat exchange capacity of a heat exchanger is obviously reduced, and the safety and the economical efficiency of a unit are influenced. A reducing inner sleeve is jointly inserted into the circular inserting opening and the preheating pipeline, the reducing inner sleeve comprises a horn-shaped connecting pipe and an inner sleeve body, sealing rings are arranged on the end face of the outer side of the inner sleeve body and located on the front section and the rear section of the annularly-arrayed supporting strips, and the inner sleeve body protects the front end of the preheating pipeline. And meanwhile, the inner sleeve and the interior of the preheating pipeline are sealed through the two sealing rings, and low-temperature corrosion of acid compounds formed by gas and water vapor to the preheating pipeline is further prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler air preheater field, concretely is a solid waste circulating fluidized bed boiler air preheater cold air end anticorrosion device. BACKGROUND

[0002] Air preheater is the flue gas in the tail of the boiler passes through the internal heat sink and enters the air preheated to a certain temperature of the heating surface, is a kind of for improving the heat exchange performance of boiler, reduce the energy consumption equipment. Air preheater is generally divided into plate type, rotary type and tube type three. Solid waste boiler fuel combustion produces SOx and HCl and other gases and the acid compound formed by water vapor, when ambient temperature is lower than their saturation temperature (dew point) when condensation can cause corrosion, also called dew point corrosion. Flue gas dew point and pipe wall temperature have influence on low temperature corrosion. When V2O5 and Fe2O3 exist in the heating area ash, will have catalytic effect on corrosion reaction. Low temperature corrosion is mainly sulfuric acid and hydrochloric acid corrosion, mainly occurs in the low temperature flue gas of boiler tail air preheater.

[0003] Solid waste boiler fuel combustion produces gas and the acid compound formed by water vapor has low temperature corrosion to the air preheater pipeline of the array setting of tubular preheater, causes pipeline breakage to cause air leakage, leakage again makes cold air leak into original flue gas, low temperature corrosion aggravates, vicious cycle, finally leads to the heat exchange capacity of heat exchanger to be significantly reduced, flue gas resistance increases, fan power consumption increases, seriously affect the safety and economy of unit;Therefore, the market urgently needs to develop a solid waste circulating fluidized bed boiler air preheater cold air end anticorrosion device to help people solve the existing problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of solid waste circulating fluidized bed boiler air preheater cold air end anticorrosion device, to solve the acid compound formed by gas and water vapor of solid waste boiler fuel combustion produces low temperature corrosion to the air preheater pipeline of the array setting of tubular preheater, causes pipeline breakage to cause air leakage, leakage again makes cold air leak into original flue gas, low temperature corrosion aggravates, vicious cycle, finally leads to the heat exchange capacity of heat exchanger to be significantly reduced, flue gas resistance increases, fan power consumption increases, seriously affect the safety and economy of unit problem of above-mentioned background art.

[0005] To achieve the above object, the utility model provides the following technical scheme: A kind of solid waste circulating fluidized bed boiler air preheater cold air end anticorrosion device, including air preheater single pipeline unit, the air preheater single pipeline unit inside is provided with preheating pipeline, the front end of the preheating pipeline and the front end surface between air preheater single pipeline unit are provided with circular socket, the rear end fixedly provided with pre-fixed connecting ring in the circular socket interior, the circular socket and preheating pipeline are inserted with variable inside sleeve tube, the variable inside sleeve tube includes flared connecting pipe and inside sleeve tube, the middle part of the outside end surface of flared connecting pipe is fixedly connected with top ring, the middle part of the outside end surface of inside sleeve tube is fixedly connected with support strip in annular array, the outside end surface of inside sleeve tube is provided with sealing ring before and after two sections of support strip in annular array, and the rear end of inside sleeve tube is provided with variable inside diameter end.

[0006] Preferably, the pre-fixed connecting ring is fixed between the circular socket and the air preheater single pipeline unit using an adhesive.

[0007] Preferably, an internal thread portion is fixedly provided on the inside end surface of the pre-fixed connecting ring.

[0008] Preferably, a sealing ring is fixedly connected to the rear end of the top ring, and an external thread portion is provided on the outside end surface of the flared connecting pipe behind the sealing ring.

[0009] Preferably, the flared connecting pipe is inserted into the circular socket and is threadedly connected and fixed to the internal thread portion of the inside end surface of the pre-fixed connecting ring through the external thread portion.

[0010] Preferably, the rear end of the sealing ring is attached to the front end of the pre-fixed connecting ring, and the gap between the front end of the flared connecting pipe and the circular socket is sealed using a sealant.

[0011] Preferably, the insertion of the flared connecting pipe into the circular socket allows the inside sleeve tube to be inserted into the inside of the preheating pipeline.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] In the utility model, the variable inside sleeve tube is provided, the variable inside sleeve tube includes the flared connecting pipe and the inside sleeve tube, the middle part of the outside end surface of the inside sleeve tube is fixedly connected with the support strip in annular array, the sealing ring is provided on the outside end surface of the inside sleeve tube before and after two sections of the support strip in annular array, the rear end of the inside sleeve tube is provided with the variable inside diameter end, the inside sleeve tube protects the front end of the preheating pipeline, the inside sleeve tube is supported in the inside of the preheating pipeline by the multiple support strips in annular array when being inserted into the inside of the preheating pipeline, to prevent the inside sleeve tube from being damaged due to shaking, and the inside sleeve tube and the inside of the preheating pipeline are sealed by the two sealing rings, to further block the low-temperature corrosion of the acidic compounds formed by the gas and water vapor on the preheating pipeline.

[0014] The utility model discloses, through the setting of pre -fixed connecting ring, after inserting the pre -fixed connecting ring into the rear end of circular socket and fixing through adhesive, first, the rear end of variable -diameter inner sleeve stretches into the circular socket and inserts into the inside of preheating pipeline front end through the inside of pre -fixed connecting ring, when inserting the inner sleeve into the inside of preheating pipeline, make the horn -shaped connecting pipe insert into the circular socket, and the female screw part of the horn -shaped connecting pipe is fixed with the female screw part of pre -fixed connecting ring inside end face thread connection, make the horn -shaped connecting pipe through pre -fixed connecting ring steady fixed in the inside of circular socket, when maintaining and overhauling the variable -diameter inner sleeve, through rotating the horn -shaped connecting pipe, make female screw part and female screw part separate, can take out the variable -diameter inner sleeve from the inside of air preheater single pipeline unit, be more convenient.

[0015] The utility model discloses, through the setting of pre -fixed connecting ring, after inserting the pre -fixed connecting ring into the rear end of circular socket and fixing through adhesive, first, the rear end of variable -diameter inner sleeve stretches into the circular socket and inserts into the inside of preheating pipeline front end through the inside of pre -fixed connecting ring, when inserting the inner sleeve into the inside of preheating pipeline, make the horn -shaped connecting pipe insert into the circular socket, and the female screw part of the horn -shaped connecting pipe is fixed with the female screw part of pre -fixed connecting ring inside end face thread connection, make the horn -shaped connecting pipe through pre -fixed connecting ring steady fixed in the inside of circular socket, when maintaining and overhauling the variable -diameter inner sleeve, through rotating the horn -shaped connecting pipe, make female screw part and female screw part separate, can take out the variable -diameter inner sleeve from the inside of air preheater single pipeline unit, be more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the stereogram of a solid waste circulating fluidized bed boiler air preheater cold air end anticorrosion device of the utility model;

[0017] Figure 2 It is the air preheater single pipeline unit side sectional view of the utility model;

[0018] Figure 3 It is the variable -diameter inner sleeve stereogram of the utility model;

[0019] Figure 4 It is the variable -diameter inner sleeve side sectional view of the utility model;

[0020] Figure 5 It is the A detail enlarged view of the utility model.

[0021] In the drawing: 1, air preheater single pipeline unit;101, preheating pipeline;102, circular socket;2, pre -fixed connecting ring;201, female screw part;3, variable -diameter inner sleeve;4, horn -shaped connecting pipe;401, top -up ring;402, sealing ring;403, female screw part;5, inner sleeve;501, support strip;502, sealing ring;503, variable inside diameter end. DETAILED DESCRIPTION

[0022] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0023] Please refer to Figures 1-5 The utility model provides an embodiment: a kind of solid waste circulating fluidized bed boiler air preheater cold air end anticorrosion device, including air preheater single pipeline unit 1, air preheater single pipeline unit 1 inside is provided with preheating pipeline 101, the front end between preheating pipeline 101 and air preheater single pipeline unit 1 front end is provided with round socket 102, round socket 102 inside rear end is fixedly provided with pre-fixed connecting ring 2, round socket 102 and preheating pipeline 101 are jointly inserted with variable inside sleeve pipe 3, variable inside sleeve pipe 3 includes flared connecting pipe 4 and inside sleeve pipe 5, flared connecting pipe 4 outer side end face middle part is fixedly connected with top ring 401, inside sleeve pipe 5 outer side end face middle part annular array is fixedly connected with support strip 501, inside sleeve pipe 5 outer side end face is provided with sealing ring 502 on and in annular array support strip 501 front and rear two sections, inside sleeve pipe 5 rear end is provided with variable inside diameter end 503.

[0024] Further, pre-fixed connecting ring 2 is fixed between round socket 102 inside and air preheater single pipeline unit 1 using adhesive.

[0025] Further, pre-fixed connecting ring 2 inside end face is fixedly provided with internal thread part 201.

[0026] Further, top ring 401 rear end is fixedly connected with sealing ring 402, flared connecting pipe 4 outer side end face is provided with external thread part 403 on and in sealing ring 402 rear end.

[0027] Further, flared connecting pipe 4 is inserted into round socket 102 inside and is fixed by external thread part 403 and the internal thread part 201 of pre-fixed connecting ring 2 inner side end face screw connection, so that flared connecting pipe 4 is stably fixed in round socket 102 inside through pre-fixed connecting ring 2, when variable inside sleeve pipe 3 is maintained and overhauled, by rotating flared connecting pipe 4, external thread part 403 and internal thread part 201 are separated, variable inside sleeve pipe 3 can be extracted from air preheater single pipeline unit 1 inside, which is more convenient.

[0028] Further, the rear end of the sealing ring 402 is in close contact with the front end of the pre-fixed connecting ring 2, and when the trumpet-shaped connecting pipe 4 is inserted into the circular socket 102 and fixed with the pre-fixed connecting ring 2, the sealing is achieved by tightly pressing the rear end of the sealing ring 402 and the front end of the pre-fixed connecting ring 2 through the pressing ring 401, preventing the flue gas from entering the circular socket 102 to cause corrosion to the preheating pipe 101 and the pre-fixed connecting ring 2. The gap between the front end of the trumpet-shaped connecting pipe 4 and the circular socket 102 is sealed with sealing glue, further preventing the flue gas from entering the inside of the circular socket 102.

[0029] Further, the inner sleeve 5 is inserted into the inside of the preheating pipe 101 before the trumpet-shaped connecting pipe 4 is inserted into the circular socket 102, and the front end of the preheating pipe 101 is protected by the inner sleeve 5. When the inner sleeve 5 is inserted into the inside of the preheating pipe 101, the inner sleeve 5 is supported inside the preheating pipe 101 by a plurality of annular array of support bars 501, preventing the inner sleeve 5 from shaking and causing damage, and at the same time, the inner sleeve 5 and the inside of the preheating pipe 101 are sealed by two sealing rings 502.

[0030] Working principle: when in use, the pre-fixed connecting ring 2 is inserted into the rear end of the circular socket 102 and fixed by adhesive. First, the rear end of the variable-diameter inner sleeve 3 is inserted into the circular socket 102 and passes through the inside of the pre-fixed connecting ring 2, and then is inserted into the inside of the front end of the preheating pipe 101. The rear end of the variable-diameter inner sleeve 3 is inserted into the inside of the preheating pipe 101, and the trumpet-shaped connecting pipe 4 is inserted into the circular socket 102, and the outer threaded part 403 of the trumpet-shaped connecting pipe 4 is screwed and fixed with the inner threaded part 201 on the inner side of the pre-fixed connecting ring 2, so that the trumpet-shaped connecting pipe 4 is stably fixed in the circular socket 102 through the pre-fixed connecting ring 2. At the same time, when the variable-diameter inner sleeve 3 is maintained and repaired, the outer threaded part 403 is separated from the inner threaded part 201 by rotating the trumpet-shaped connecting pipe 4, so that the variable-diameter inner sleeve 3 can be pulled out of the single pipe unit 1 inside the air preheater. It is more convenient. When the trumpet-shaped connecting pipe 4 is inserted into the circular socket 102 and fixed with the pre-fixed connecting ring 2, the sealing is achieved by tightly pressing the rear end of the sealing ring 402 and the front end of the pre-fixed connecting ring 2 through the pressing ring 401, preventing the flue gas from entering the circular socket 102 to cause corrosion to the preheating pipe 101 and the pre-fixed connecting ring 2. The gap between the front end of the trumpet-shaped connecting pipe 4 and the circular socket 102 is sealed with sealing glue, further preventing the flue gas from entering the inside of the circular socket 102, and the front end of the preheating pipe 101 is protected by the inner sleeve 5. When the inner sleeve 5 is inserted into the inside of the preheating pipe 101, the inner sleeve 5 is supported inside the preheating pipe 101 by a plurality of annular array of support bars 501, preventing the inner sleeve 5 from shaking and causing damage, and at the same time, the inner sleeve 5 and the inside of the preheating pipe 101 are sealed by two sealing rings 502.

[0031] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A cold air end anti-corrosion device for a solid waste circulating fluidized bed boiler air preheater, comprising a single air preheater pipe unit (1), characterized in that: A preheating pipe (101) is provided inside the single pipe unit (1) of the air preheater. A circular socket (102) is provided between the front end of the preheating pipe (101) and the front end surface of the single pipe unit (1) of the air preheater. A pre-fixed connecting ring (2) is fixedly provided inside the rear end of the circular socket (102). A variable diameter inner sleeve (3) is inserted into the circular socket (102) and the preheating pipe (101). The variable diameter inner sleeve (3) comprises a trumpet-shaped connecting pipe (4) and an inner sleeve (5). A tightening ring (401) is fixedly connected to the middle of the outer end face of the trumpet-shaped connecting pipe (4). A support bar (501) is fixedly connected to the middle of the outer end face of the inner sleeve (5) in an annular array. A sealing ring (502) is provided on the outer end face of the inner sleeve (5) and at both the front and rear sections of the support bar (501) in the annular array. A variable inner diameter end (503) is provided at the rear end of the inner sleeve (5).

2. The anti-corrosion device for the cold air end of an air preheater of a solid waste circulating fluidized bed boiler according to claim 1, characterized in that: The pre-fixed connecting ring (2) is fixed between the inside of the circular socket (102) and the single pipe unit (1) of the air preheater by using adhesive.

3. The anti-corrosion device for the cold air end of an air preheater of a solid waste circulating fluidized bed boiler according to claim 1, characterized in that: An internal threaded portion (201) is fixedly provided on the inner end surface of the pre-fixed connecting ring (2).

4. The anti-corrosion device for the cold air end of an air preheater of a solid waste circulating fluidized bed boiler according to claim 1, characterized in that: The rear end of the tightening ring (401) is fixedly connected to a sealing ring (402), and an external threaded portion (403) is provided on the outer end surface of the trumpet-shaped connecting pipe (4) and at the rear end of the sealing ring (402).

5. The anti-corrosion device for the cold air end of an air preheater of a solid waste circulating fluidized bed boiler according to claim 4, characterized in that: The trumpet-shaped connecting pipe (4) is inserted into the circular socket (102) and is threadedly connected and fixed to the internal threaded portion (201) of the inner end surface of the pre-fixed connecting ring (2) through the external threaded portion (403).

6. The anti-corrosion device for the cold air end of an air preheater of a solid waste circulating fluidized bed boiler according to claim 5, characterized in that: The rear end of the sealing ring (402) is fitted with the front end of the pre-fixed connecting ring (2), and the gap between the front end of the trumpet-shaped connecting pipe (4) and the circular socket (102) is sealed with sealant.

7. The anti-corrosion device for the cold air end of an air preheater of a solid waste circulating fluidized bed boiler according to claim 6, characterized in that: Before the trumpet-shaped connecting pipe (4) is inserted into the circular socket (102), the inner sleeve (5) is inserted into the interior of the preheating pipe (101).

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