CN209458967U - Flue and waste heat boiler - Google Patents

Flue and waste heat boiler Download PDF

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Publication number
CN209458967U
CN209458967U CN201920147654.5U CN201920147654U CN209458967U CN 209458967 U CN209458967 U CN 209458967U CN 201920147654 U CN201920147654 U CN 201920147654U CN 209458967 U CN209458967 U CN 209458967U
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CN
China
Prior art keywords
flue
bed
shell
refractory casting
casting bed
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Application number
CN201920147654.5U
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Chinese (zh)
Inventor
耿生斌
谢全虎
李博
蔡洁
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Deason (changzhou) Boiler Co Ltd
Guangzhou Devotion Thermal Technology Co Ltd
Original Assignee
Deason (changzhou) Boiler Co Ltd
Guangzhou Devotion Thermal Technology Co Ltd
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Application filed by Deason (changzhou) Boiler Co Ltd, Guangzhou Devotion Thermal Technology Co Ltd filed Critical Deason (changzhou) Boiler Co Ltd
Priority to CN201920147654.5U priority Critical patent/CN209458967U/en
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Publication of CN209458967U publication Critical patent/CN209458967U/en
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Abstract

The utility model discloses flue and waste heat boilers, are related to chemical equipment technical field.Including flue shell, the refractory casting bed of material, the insulated pouring bed of material and anti-scald decorative protection cover layer;The refractory casting bed of material and the insulated pouring bed of material are successively set on the inner wall of the flue shell from inside to outside;The outer wall of the flue shell is arranged in the anti-scald decorative protection cover layer;The flue can be avoided generation corrosion, improve the service life of waste heat boiler.

Description

Flue and waste heat boiler
Technical field
The utility model relates to chemical equipment technical field, more particularly, to flue and waste heat boiler.
Background technique
Currently, usually being adopted to the petrochemical industry treatments of wastes produced such as generated waste liquid, exhaust gas, waste residue in process of production Mode is directly to burn these wastes, and the 1000 DEG C of high-temperature flue gas generated after burning enter waste heat boiler, pass through waste heat Boiler, high-temperature flue gas thermal energy is converted into steam and high temperature air outwardly exports, to realize the recycling of these wastes.
Sulfur content is larger in such waste, and the flue gas acid dew point temperature after burning generally reaches 180 DEG C, when flue gas and cigarette When the inner wall of road shell directly contacts, since flue wall temperature is lower than the acid dew-point temperature of flue gas, flue gas is in flue shell Internal wall occurs condensation and generates corrosion to flue shell, influences the service life of entire waste heat boiler.
Utility model content
The purpose of this utility model is to provide flue and waste heat boiler, which can be avoided generation and corrodes, more than raising The service life of heat boiler.
To achieve the above object, the utility model the following technical schemes are provided:
One side according to the present utility model provides flue, including flue shell, the refractory casting bed of material, insulated pouring material Layer and anti-scald decorative protection cover layer;
The refractory casting bed of material and the insulated pouring bed of material are successively set on the flue shell from inside to outside Inner wall;
The outer wall of the flue shell is arranged in the anti-scald decorative protection cover layer.
Further, anchoring screw assembly is equipped in the refractory casting bed of material and the insulated pouring bed of material;
The refractory casting bed of material and the insulated pouring bed of material are fixed on the flue by the anchoring screw assembly On the inner wall of shell.
Further, the anchoring screw assembly includes Y type anchor studs and first straight line type anchor studs;
The head Y of the Y type anchor studs is directed reach in the refractory casting bed of material towards the refractory casting bed of material Side;The tail portion of the Y type anchor studs stays in the insulated pouring bed of material, and is fixed on the inner wall of the flue shell;
The refractory casting bed of material is directed reach towards the refractory casting bed of material in the head of the first straight line type anchor studs Inboard;The tail portion of the first straight line type anchor studs stays in the insulated pouring bed of material, and is fixed on the flue shell Inner wall.
Further, second straight line type anchor studs are inserted in the anti-scald decorative protection cover layer;
The second straight line type anchor studs are plugged in the anti-scald decorative protection cover layer, and are fixed on the flue shell Outer wall.
Further, the outer wall of the flue shell is equipped with horizontal reinforcement ribs;
The anti-scald decorative protection cover layer is set in the horizontal reinforcement ribs.
Further, the outer wall of the flue shell is additionally provided with longitudinal reinforcement rib;
The longitudinal reinforcement rib and the horizontal reinforcement ribs vertical connection;
The anti-scald decorative protection cover layer is set on the horizontal reinforcement ribs and the longitudinal reinforcement rib.
Further, on the inner surface of the refractory casting bed of material interval be formed with it is a plurality of along the refractory casting bed of material Length direction through setting and have twine away from air-guiding aisle;The air-guiding aisle to enter the intracorporal cigarette of flue shell Gas forms whirlwind under the action of the air-guiding aisle.
Further, in the case where state is paved in the expansion of the refractory casting bed of material, each air-guiding aisle is linear logical Road, and the oblique and spaced and parallel setting in the refractory casting bed of material updip of each linear passageway.
Further, the inner surface of the linear passageway is arcwall face, and is formed between the two neighboring linear passageway Smooth curved surface.
Another aspect according to the present utility model, provides waste heat boiler, the flue provided including above-mentioned technical proposal.
Compared with prior art, the utility model has the following beneficial effects:
Flue according to the present utility model, including flue shell, the refractory casting bed of material, the insulated pouring bed of material and anti-scald Decorative protection cover layer;The refractory casting bed of material and the insulated pouring bed of material are successively set on the flue shell from inside to outside Inner wall;The outer wall of the flue shell is arranged in the anti-scald decorative protection cover layer;For the flue, in flue shell Inner wall is equipped with fire resisting and pours the bed of material and the insulated pouring bed of material, and fire resisting pours the bed of material and the insulated pouring bed of material makes flue shell Inner wall there is the property of fire resisting and heat preservation, can be avoided flue gas and directly contacted with the inner wall of flue shell, flue gas is avoided to exist Flue inner walls occur condensation and generate corrosion to flue shell, improve the service life of waste heat boiler.
Flue according to the present utility model, anchoring screw assembly includes Y type anchor studs and first straight line type anchor studs;Y type The inboard of the refractory casting bed of material is directed reach towards the refractory casting bed of material in the head Y of anchor studs;The tail portion of Y type anchor studs stays in guarantor In warm cast bed of material, and it is fixed on the inner wall of flue shell;The head of first straight line type anchor studs towards the refractory casting bed of material, and Direct reach the inboard of the refractory casting bed of material;The tail portion of first straight line type anchor studs stays in the insulated pouring bed of material, and is fixed on flue The inner wall of shell;Using Y type anchor studs and first straight line type anchor studs bilayer to the refractory casting bed of material and insulated pouring material Layer is fixed, and the tail portion of Y type anchor studs and the tail portion of first straight line type anchor studs are welded on the inner wall of flue shell On.
According to the utility model flue, second straight line type anchor studs are inserted in anti-scald decorative protection cover layer;Second straight line type Anchor studs are plugged in anti-scald decorative protection cover layer, and are fixed on the outer wall of flue shell;Anti-scald decorative protection cover layer is fixed on flue Mode on the outer wall of shell are as follows: anti-scald decorative protection cover layer is fixed on the outer wall of flue shell by second straight line type anchor studs On, specifically, second straight line type anchor studs are inserted into anti-scald decorative protection cover layer, and the head of second straight line type anchor studs is welded on cigarette On the inner wall of road shell, and the tail portion of second straight line type anchor studs stays in outside anti-scald decorative protection cover layer.
Detailed description of the invention
In order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art, lower plate will be right Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, lower plate description In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of flue provided by the embodiment of the utility model.
Icon: 10- flue shell;The 20- refractory casting bed of material;The 30- insulated pouring bed of material;The anti-scald decorative protection cover layer of 40-; 50- anchors screw assembly;501-Y type anchor studs;502- first straight line type anchor studs;60- second straight line type anchor studs.
Specific embodiment
Lower plate will be clearly and completely described the technical solution of the utility model in conjunction with attached drawing, it is clear that described Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical Novel protected range.
It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " the One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally Connection;It can be mechanical connection, be also possible to be electrically connected;Can be directly connected, can also indirectly connected through an intermediary, It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition The concrete meaning of language in the present invention.
Fig. 1 is the structural schematic diagram of flue provided by the embodiment of the utility model.
Embodiment 1
One aspect according to the present utility model, as shown in Figure 1, providing flue, including flue shell 10, castable refractory Layer 20, the insulated pouring bed of material 30 and anti-scald decorative protection cover layer 40;
The refractory casting bed of material 20 and the insulated pouring bed of material 30 are successively set on the inner wall of flue shell 10 from inside to outside;
The outer wall of flue shell 10 is arranged in anti-scald decorative protection cover layer 40.
Flue according to the present utility model, currently, to petrochemical industry in process of production caused by waste liquid, exhaust gas, useless The treatments of wastes produced such as slag, the mode generallyd use are directly to burn these wastes, the 1000 DEG C of high-temperature flue gas generated after burning Into waste heat boiler, by waste heat boiler, high-temperature flue gas thermal energy is converted into steam and high temperature air outwardly exports, to realize this The recycling of a little wastes.Sulfur content is larger in such waste, and the flue gas acid dew point temperature after burning generally reaches 180 DEG C, when the inner wall of flue gas and flue shell directly contacts, since flue wall temperature is lower than the acid dew-point temperature of flue gas, Flue gas occurs condensation in flue inner walls and generates corrosion to flue shell, influences the service life of entire waste heat boiler.
For the flue, fire resisting is equipped in the inner wall of flue shell 10 and pours the bed of material 20 and the insulated pouring bed of material 30, fire resisting pours the property that the bed of material 20 and the insulated pouring bed of material 30 make the inner wall of flue shell 10 have fire resisting and heat preservation Matter can be avoided flue gas and directly contact with the inner wall of flue shell, avoid flue gas that condensation occurs to cigarette in 10 inner wall of flue shell Road shell generates corrosion, improves the service life of waste heat boiler.
In addition, there may be crack, flue gases to reach flue through these cracks for internal castable in actual moving process The inner wall of shell, since the wall temperature of flue shell is lower than the acid dew-point temperature of flue gas, however it remains the corrosion to flue shell is It avoids corrosion of the flue gas to equipment, by adjusting the thickness of castable, improves the wall temperature of flue shell, so that flue shell Wall temperature is close to or higher than the acid dew-point temperature of flue gas, fundamentally the dewing corrosion of pre- flue gas, it is ensured that the use of waste heat boiler Service life, since the wall temperature of flue shell is improved, it may occur that field personnel's scald accident, to avoid such thing Therefore generation, while being equipped with one layer of anti-scald decorative protection cover 40 in the outer wall of flue shell 10 to avoid field personnel close to setting Standby scald.
Wherein, flue shell 10 is formed from steel, and flue shell 10 is rectangular or cylindrical;Anti-scald decorative protection cover layer 40 can For alumina silicate, rock wool, perlite etc..
According to a kind of embodiment of the utility model flue, set in the refractory casting bed of material 20 and the insulated pouring bed of material 30 There is anchoring screw assembly 50;
The refractory casting bed of material 20 and the insulated pouring bed of material 30 pass through anchoring screw assembly 50 and are fixed on the interior of flue shell 10 On wall.
Cigarette is arranged in flue according to the present utility model, the refractory casting bed of material 20 and the insulated pouring bed of material 30 from inside to outside Mode on the inner wall of road shell 10: anchoring screw assembly 50 fixes the refractory casting bed of material 20 and the insulated pouring bed of material 30 together On the inner wall of flue shell 10;
Further, anchoring screw assembly 50 includes Y type anchor studs 501 and first straight line type anchor studs 502;
The inboard of the refractory casting bed of material 20 is directed reach towards the refractory casting bed of material 20 in the head Y of Y type anchor studs 501;Y type The tail portion of anchor studs 501 stays in the insulated pouring bed of material 30, and is fixed on the inner wall of flue shell 10;
The head of first straight line type anchor studs 502 is directed reach in the refractory casting bed of material 20 towards the refractory casting bed of material 20 Side;The tail portion of first straight line type anchor studs 502 stays in the insulated pouring bed of material 30, and is fixed on the inner wall of flue shell 10.
It should be noted that the inboard of the refractory casting bed of material 20 is close to fume side, directing reach can be regarded as close but does not have Contact, so that Y type anchor studs 501 and the insertion refractory casting bed of material 20 of first straight line type anchor studs 502 are more, so that resistance to The ratio that fiery cast bed of material 20 and the insulated pouring bed of material 30 are fixed on flue shell 10 is stronger;
In addition, using Y type anchor studs 501 and first straight line type anchor studs 502 it is double-deck to the refractory casting bed of material 20 and The insulated pouring bed of material 30 is fixed, and the tail portion of Y type anchor studs 501 and the tail portion of first straight line type anchor studs 502 are welded It connects on the inner wall of flue shell 10.
According to a kind of embodiment of the utility model flue, second straight line type anchor is inserted in anti-scald decorative protection cover layer 40 Admittedly following closely 60;
Second straight line type anchor studs 60 are plugged in anti-scald decorative protection cover layer 40, and are fixed on the outer wall of flue shell 10.
Flue according to the present utility model, anti-scald decorative protection cover layer 40 are fixed on the mode on the outer wall of flue shell 10 Are as follows: anti-scald decorative protection cover layer 40 is fixed on the outer wall of flue shell 10 by second straight line type anchor studs 60, specifically, second Linear type anchor studs 60 are inserted into anti-scald decorative protection cover layer 40, and the head of second straight line type anchor studs 60 is welded on flue shell 10 Inner wall on, and the tail portion of second straight line type anchor studs 60 stays in 40 outside of anti-scald decorative protection cover layer.
According to a kind of embodiment of the utility model flue, the outer wall of flue shell 10 is equipped with horizontal reinforcement ribs;
Anti-scald decorative protection cover layer 40 is set in horizontal reinforcement ribs.
According to the utility model flue, for flue shell 10, transversely strengthening is equipped in the outer wall of flue shell 10 Rib, horizontal reinforcement ribs play the effect for reinforcing 10 rigidity of flue shell;
When flue shell 10 is rectangular, the horizontal reinforcement ribs that the outside of flue shell 10 is equipped with are exactly flat with horizontal direction Capable horizontal reinforcement ribs;
When flue shell 10 is cylindrical, the horizontal reinforcement ribs that the outside of flue shell 10 is equipped with are exactly to be arranged along cylinder Horizontal reinforcement ribs.
According to a kind of embodiment of the utility model flue, the outer wall of flue shell 10 is additionally provided with longitudinal reinforcement rib;
Longitudinal reinforcement rib and horizontal reinforcement ribs vertical connection;
Anti-scald decorative protection cover layer 40 is set on horizontal reinforcement ribs and longitudinal reinforcement rib.
Flue according to the present utility model, for the flue shell 10, the outer wall of flue shell 10 is in addition to being equipped with cross To reinforcing rib, the outer wall of flue shell 10 is additionally provided with longitudinal reinforcement rib, when being additionally provided with longitudinal reinforcement on the outer wall of flue shell 10 When rib, longitudinal reinforcement rib is vertical with horizontal reinforcement ribs;It is also sharp while longitudinal reinforcement rib further strengthens 10 rigidity of flue shell In with the mutual stability of horizontal reinforcement ribs;
When flue shell 10 is rectangular, the longitudinal reinforcement rib that the outside of flue shell 10 is equipped with is exactly to hang down with horizontal direction Straight longitudinal reinforcement rib;
When flue shell 10 is cylindrical, the longitudinal reinforcement rib that the outside of flue shell 10 is equipped with is exactly and flue shell The longitudinal reinforcement rib of 10 axis parallel;
Preferably, horizontal reinforcement ribs and longitudinal reinforcement rib are covered with the outer wall of entire flue shell 10.
According to a kind of embodiment of the utility model flue, interval is formed with more on the inner surface of the refractory casting bed of material 20 Item along the refractory casting bed of material 20 length direction through setting and have twine away from air-guiding aisle;Air-guiding aisle to enter cigarette Flue gas in road shell 10 forms whirlwind under the action of air-guiding aisle.
Flue according to the present utility model, air-guiding aisle through setting and have along the length direction of the refractory casting bed of material 20 Certain twines away from so that generating whirlwind under the action of air-guiding aisle into the flue gas in flue shell 10, i.e. air-guiding aisle makes The wind that flue gas forms corkscrew motion along the length direction of the refractory casting bed of material 20 is obtained, so that flue gas is rapid in flue shell 10 Stream mode, which on the one hand can roll the cigarette ash in flue gas and the annular space at the center that is maintained at flue shell 10 It in region, is covered on the refractory casting bed of material 20 to avoid cigarette ash, generates accumulation;On the other hand it can also make the flowing of flue gas more To be steady, to improve the conveying quality and transfer efficiency of flue gas;The material of the air-guiding aisle is refractory material.
According to a kind of embodiment of the utility model flue, in the case where state is paved in the expansion of the refractory casting bed of material 20, respectively Air-guiding aisle is linear passageway, and each linear passageway tilts on the refractory casting bed of material 20 and spaced and parallel setting.
Flue according to the present utility model, in the case where state is paved in the expansion of the refractory casting bed of material 20, each air-guiding aisle is Linear passageway, and each linear passageway tilts on the refractory casting bed of material 20 and spaced and parallel setting by the setting works as fire resisting When cast bed of material 20 is in rolled state, each air-guiding aisle forms the structure for being similar to gun barrel bore line, to make the gas of flue gas The wind that corkscrew motion is formed under the action of each air-guiding aisle is flowed, to drive the flue dust in flue gas steadily to move ahead.
According to a kind of embodiment of the utility model flue, the inner surface of linear passageway is arcwall face, and two neighboring Smooth curved surface is formed between linear passageway.
Flue according to the present utility model, in order to make the corkscrew motion state of the flue gas entered in flue shell 10 more Stablize, the inner surface of air-guiding aisle can be arranged to arcwall face, and be formed as smooth song between two adjacent air-guiding aisles Face, smooth curved surface can reduce resistance.
Embodiment 2
Above-described embodiment is the statement carried out for flue, and in the prior art, sulfur content is larger in waste, after burning Flue gas acid dew point temperature generally reach 180 DEG C, when the inner wall of flue gas and flue shell directly contacts, due to flue housing wall Temperature is lower than the acid dew-point temperature of flue gas, therefore flue gas occurs condensation in flue inner walls and generates corrosion to flue shell, influences To the service life of entire waste heat boiler.Therefore, it is poured by the inner wall of the flue shell of the flue in embodiment 1 equipped with fire resisting The bed of material and the insulated pouring bed of material, fire resisting pours the bed of material and the insulated pouring bed of material make the inner wall of flue shell have fire resisting with And the property of heat preservation, it can be avoided flue gas and directly contacted with the inner wall of flue shell, flue gas is avoided to occur in flue inner walls Condensation generates corrosion to flue shell, improves the service life of waste heat boiler.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited System;Although utility model is described in detail referring to foregoing embodiments, those skilled in the art should be managed Solution: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of skills Art feature is equivalently replaced;And these are modified or replaceed, it does not separate the essence of the corresponding technical solution the utility model The range of each embodiment technical solution.

Claims (10)

1. flue, which is characterized in that including flue shell, the refractory casting bed of material, the insulated pouring bed of material and anti-scald decorative protection cover Layer;
The refractory casting bed of material and the insulated pouring bed of material are successively set on the inner wall of the flue shell from inside to outside;
The outer wall of the flue shell is arranged in the anti-scald decorative protection cover layer.
2. flue according to claim 1, which is characterized in that the refractory casting bed of material and the insulated pouring bed of material It is interior to be equipped with anchoring screw assembly;
The refractory casting bed of material and the insulated pouring bed of material are fixed on the flue shell by the anchoring screw assembly Inner wall on.
3. flue according to claim 2, which is characterized in that the anchoring screw assembly includes Y type anchor studs and first Linear type anchor studs;
The inboard of the refractory casting bed of material is directed reach towards the refractory casting bed of material in the head Y of the Y type anchor studs;Institute The tail portion for stating Y type anchor studs stays in the insulated pouring bed of material, and is fixed on the inner wall of the flue shell;
The head of the first straight line type anchor studs is directed reach in the refractory casting bed of material towards the refractory casting bed of material Side;The tail portion of the first straight line type anchor studs stays in the insulated pouring bed of material, and is fixed on the interior of the flue shell Wall.
4. flue according to claim 1, which is characterized in that be inserted with second straight line type in the anti-scald decorative protection cover layer Anchor studs;
The second straight line type anchor studs are plugged in the anti-scald decorative protection cover layer, and are fixed on the outer of the flue shell Wall.
5. flue according to claim 1, which is characterized in that the outer wall of the flue shell is equipped with horizontal reinforcement ribs;
The anti-scald decorative protection cover layer is set in the horizontal reinforcement ribs.
6. flue according to claim 5, which is characterized in that the outer wall of the flue shell is additionally provided with longitudinal reinforcement rib;
The longitudinal reinforcement rib and the horizontal reinforcement ribs vertical connection;
The anti-scald decorative protection cover layer is set on the horizontal reinforcement ribs and the longitudinal reinforcement rib.
7. flue according to claim 1, which is characterized in that be spaced and be formed on the inner surface of the refractory casting bed of material The a plurality of length direction along the refractory casting bed of material through setting and have twine away from air-guiding aisle;The air-guiding aisle makes It obtains into the intracorporal flue gas of flue shell and forms whirlwind under the action of the air-guiding aisle.
8. flue according to claim 7, which is characterized in that in the case where state is paved in the expansion of the refractory casting bed of material, Each air-guiding aisle is linear passageway, and each linear passageway is oblique in the refractory casting bed of material updip and interval is flat Row setting.
9. flue according to claim 8, which is characterized in that the inner surface of the linear passageway is arcwall face, and adjacent Smooth curved surface is formed between two linear passageway.
10. waste heat boiler, which is characterized in that including the described in any item flues of claim 1-9.
CN201920147654.5U 2019-01-25 2019-01-25 Flue and waste heat boiler Active CN209458967U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920147654.5U CN209458967U (en) 2019-01-25 2019-01-25 Flue and waste heat boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920147654.5U CN209458967U (en) 2019-01-25 2019-01-25 Flue and waste heat boiler

Publications (1)

Publication Number Publication Date
CN209458967U true CN209458967U (en) 2019-10-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920147654.5U Active CN209458967U (en) 2019-01-25 2019-01-25 Flue and waste heat boiler

Country Status (1)

Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113338578A (en) * 2021-06-14 2021-09-03 胡德创 Environment-friendly flue and control method thereof
CN113338578B (en) * 2021-06-14 2021-12-10 胡德创 Environment-friendly flue and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113338578A (en) * 2021-06-14 2021-09-03 胡德创 Environment-friendly flue and control method thereof
CN113338578B (en) * 2021-06-14 2021-12-10 胡德创 Environment-friendly flue and control method thereof

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