CN112179144A - Energy saving device and mounting method thereof - Google Patents
Energy saving device and mounting method thereof Download PDFInfo
- Publication number
- CN112179144A CN112179144A CN202011061198.6A CN202011061198A CN112179144A CN 112179144 A CN112179144 A CN 112179144A CN 202011061198 A CN202011061198 A CN 202011061198A CN 112179144 A CN112179144 A CN 112179144A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000009434 installation Methods 0.000 claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 6
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000835 fiber Substances 0.000 claims abstract description 5
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000853 adhesive Substances 0.000 claims description 12
- 230000001070 adhesive effect Effects 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 2
- 229910052681 coesite Inorganic materials 0.000 claims 1
- 229910052906 cristobalite Inorganic materials 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 229910052682 stishovite Inorganic materials 0.000 claims 1
- 229910052905 tridymite Inorganic materials 0.000 claims 1
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/02—Crowns; Roofs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
- F27D25/001—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag comprising breaking tools, e.g. hammers, drills, scrapers
Abstract
The invention provides an energy-saving device and an installation method thereof, wherein the energy-saving device comprises a hollow energy-saving element; the connecting piece is provided with an installation part and a clamping part, and an included angle between the installation part and the clamping part is not zero; one end of the mounting part is suitable for being directly or indirectly fixed on the inner wall of the heating furnace; the connecting piece is formed by sintering the following materials: greater than 80% of a-A12O31-18% of mullite fiber, 0.1-2% of sintering aid and 0.1-2% of TiO2The above percentages are mass percentages; the other end of the energy-saving element is provided with a hole suitable for the installation part and the clamping part to pass through; the depth of the hole is less than the length of the mounting portion, and the mounting portion is suitable for relative rotation in the hole; the energy-saving element is internally provided with a space which is suitable for the relative rotation of a clamping part passing through the hole, and the clamping partThe distance from the end part of the mounting part to the clamping part is larger than the width of the hole. The invention has the advantages of firm installation, high efficiency and the like.
Description
Technical Field
The invention relates to energy conservation, in particular to an energy-saving device and an installation method thereof.
Background
The heat transfer theory and a large number of engineering cases prove that the blackbody enhanced radiation heat transfer technology can improve the emissivity of a hearth of a heating furnace and enhance the radiation heat transfer of a furnace wall, and is an efficient furnace energy-saving technology.
At present, elements are arranged on a furnace lining built by refractory bricks or poured by refractory castable, and the general installation process comprises the following steps: the element is bonded to the furnace wall skin by means of an adhesive or by means of an adhesive in combination with heat-resistant screws. The mounting modes can mount the elements on the furnace wall or the furnace top in a bonding and sintering mode, and the falling rate is low. However, as the elements in the heating furnace are used for a long time, the surfaces of some elements are covered by impurities in the heating furnace, so that the elements are difficult to clean and replace, and the energy-saving effect of the elements is influenced. Meanwhile, the shutdown time of a common steel rolling heating furnace is limited, and more rigorous requirements are put forward for the construction period of black body technology implementation. These factors influence the popularization and application of the enhanced radiation heat transfer technology.
Therefore, how to quickly install and conveniently replace the energy-saving element on the inner wall of the heating furnace is a technical problem which needs to be solved urgently.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the energy-saving device which is high in installation efficiency and convenient for replacing energy-saving elements.
The purpose of the invention is realized by the following technical scheme:
the energy-saving device comprises an energy-saving element, wherein the energy-saving element is of a hollow structure, and one end of the energy-saving element is open; the energy saving device further comprises:
the connecting piece is provided with an installation part and a clamping part, and an included angle between the installation part and the clamping part is not zero; one end of the mounting part is suitable for being directly or indirectly fixed on the inner wall of the heating furnace; the connecting piece is formed by sintering the following materials: greater than 80% of a-A12O31-18% of mullite fiber, 0.1-2% of sintering aid and 0.1-2% of TiO2The above percentages are mass percentages;
the other end of the energy-saving element is provided with a hole suitable for the installation part and the clamping part to pass through; the depth of the hole is less than the length of the mounting portion, and the mounting portion is suitable for relative rotation in the hole; the energy-saving element is internally provided with a space suitable for the clamping part penetrating through the hole to relatively rotate, and the distance from the end part of the clamping part far away from the installation part to the clamping part is larger than the width of the hole.
Another object of the present invention is to provide a method for installing an energy saving device with high installation efficiency and firmness, which is achieved by the following technical solution:
a method of installing an energy saving device, the method comprising the steps of:
(A1) cleaning the inner wall of the heating furnace;
(A2) marking and positioning in the heating furnace according to the arrangement scheme of the energy-saving elements;
(A3) drilling a mounting hole at the mounting position, wherein the drilling depth is more than or equal to 10 mm;
(A4) filling adhesive into the mounting hole, and inserting the mounting part of the connecting piece into the mounting hole;
(A5) after the adhesive is hardened, the clamping part penetrates through the hole of the energy-saving element, the energy-saving element is rotated, and the clamping part clamps the energy-saving element.
Compared with the prior art, the invention has the beneficial effects that:
in view of the technical problems in the prior art, the applicant proposes a connector for mounting an energy saving element on the inner wall of a heating furnace; in the construction, fix the connecting piece at the heating furnace inner wall earlier, with energy-conserving component card on the connecting piece again, realized:
1. the installation efficiency is high;
the mounting piece is fixed on the inner wall of the heating furnace, and the mounting mode of the energy-saving element is as follows: the clamping part and the mounting part penetrate through the holes, and then the energy-saving element is rotated in the forward direction, so that the clamping part clamps the energy-saving element, and the mounting is quick and efficient;
the installation parts are connected through the connecting parts and are fixed in a hole in the inner wall of the heating furnace by the fixing part, namely, the installation of a plurality of energy-saving elements is realized by forming a hole in the inner wall of the heating furnace, and the installation efficiency is further improved;
2. the installation is stable;
the connecting piece made of special materials has excellent performance: bending strength is more than 500MPa, and impact resistance is more than 4Mpa/m2Coefficient of thermal expansion (5-8.3). times.10-6The temperature is not lower than 1450 ℃ after long-term use, so that the fixing stability of the energy-saving element is improved;
3. the replacement is convenient;
when the energy-saving element needs to be replaced, the energy-saving element can be taken down by rotating reversely, so that the device is convenient and quick;
4. the energy-saving effect is good;
the arrangement of the closed part improves the energy-saving effect.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a flowchart of an installation method of an energy saving device according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
the energy-saving device of the embodiment of the invention comprises:
the connecting piece is provided with an installation part and a clamping part, and an included angle between the installation part and the clamping part is not zero; one end of the mounting part is suitable for being directly or indirectly fixed on the inner wall of the heating furnace, and the clamping part can be in a shape of a straight line, a Y shape, an arc shape and the like; the connecting piece is formed by sintering the following materials: greater than 80% of a-A12O31-18% of mullite fiber, 0.1-2% of sintering aid and 0.1-2% of TiO2The above percentages are mass percentages;
the energy-saving element is of a hollow structure, and one end of the energy-saving element is open; the other end of the energy-saving element is provided with a hole suitable for the installation part and the clamping part to pass through; the depth of the hole is less than the length of the mounting portion, and the mounting portion is suitable for relative rotation in the hole; have in the energy-conserving component and be suitable for the pass the space of the chucking looks relative rotation in hole, keeping away from of chucking the distance of the tip of installation department to chucking is greater than the width in hole for (after passing the hole) chucking is in the space blocks energy-conserving component after the relative rotation, has realized the chucking function.
In order to further improve the installation efficiency, further, the connecting piece further comprises:
a coupling portion for connecting a plurality of mounting portions;
and one end of the fixing part is connected with the connecting part, and the other end of the fixing part is suitable for being inserted into the inner wall of the heating furnace.
In order to reduce the processing difficulty, the connecting part and the clamping part are arranged in parallel; the middle part of clamping part with the other end of installation department is connected.
In order to facilitate the installation part and the clamping part to pass through the through hole, further, the hole is a through hole, the length of the through hole is not less than the length and the width of the clamping part are not less than the thickness of the installation part and the clamping part.
In order to form the space conveniently, further, the space is a hollow portion of the energy saving element; or the other end of the energy-saving element is provided with a groove, and the hole, the groove and the opening end are sequentially arranged; the space is formed in the groove.
In order to further clamp the energy saving element, the inner wall of the other end of the energy saving element is provided with a groove suitable for accommodating a part of the clamping part, and the groove is crossed with the hole; the included angle between the groove and the hole is an acute angle or a right angle.
In order to improve the energy-saving effect, the inside of the energy-saving element is provided with a closed part, the closed part divides the inside of the energy-saving element into two parts, one part is open at one end, and the other end is closed without a bulge and a notch, so that the energy-saving effect is improved.
Fig. 1 is a flowchart of an installation method of an energy saving device according to an embodiment of the present invention, and as shown in fig. 1, the installation method includes the following steps:
(A1) cleaning the inner wall of the heating furnace;
(A2) marking and positioning in the heating furnace according to the arrangement scheme of the energy-saving elements;
(A3) drilling a mounting hole at the mounting position, wherein the drilling depth is more than or equal to 10 mm;
(A4) filling adhesive into the mounting hole, and inserting the mounting part of the connecting piece into the mounting hole;
(A5) after the adhesive is hardened, the clamping part penetrates through the hole of the energy-saving element, the energy-saving element rotates forwards, and the clamping part clamps the energy-saving element.
In order to improve the installation stability, further, the installation part is provided with an external thread which enters the installation hole in a rotating mode.
The replacement mode of the energy-saving device is as follows:
and reversely rotating the energy-saving element to enable the mounting part and the clamping part to exit the hole of the energy-saving element, thereby removing the energy-saving element.
Example 2:
an application example of the energy saving device applied to the heating furnace according to embodiment 1 of the present invention.
In the application example, the energy-saving element is a cylindrical part with an opening at one end and a closed end, the closed end is provided with a straight rectangular through hole, the inner wall of the closed end is provided with a groove suitable for accommodating the part of the clamping part, and an included angle between the groove and the through hole is 90 degrees;
the connecting piece is provided with a cylindrical mounting part and a cylindrical clamping part, and the mounting part is provided with an external thread; the included angle between the mounting part and the clamping part is a right angle, and the middle part of the clamping part is fixedly connected with one end of the mounting part; the length of clamping part is not more than the length of through-hole, the thickness of clamping part and installation department is not more than logicalThe width of the hole is larger than the length of the installation part, the distance from the end part of the clamping part far away from the installation part to the clamping part is larger than the width of the hole, so that the clamping part and the installation part can penetrate through the through hole, the installation part rotates in the through hole, and the clamping part rotates in the hollow part in the energy-saving element; the connecting piece is formed by sintering the following materials: the mass fraction is more than 80% (such as 80%, 85%, 90%, 94%), the purity is 99.8%, and the particle diameter is 1.5um2O31-18% of mullite fiber with the diameter of 12um and the length of 5mm (such as 1%, 7%, 12% and 18%), 0.1-2% of sintering aid: CMS (chemical pure reagent CaO-MgO-SiO)2According to the weight ratio of 25.9: 18.6: 55.6 proportion, and the mass fraction is 0.1-2% (such as 0.1%, 0.6%, 1.3%, and 2%) TiO with purity of 99% and average particle diameter of 2.7um2。
The installation method of the energy-saving device comprises the following steps:
(A1) cleaning the inner wall of the heating furnace, such as cleaning dust and coking;
(A2) marking and positioning in the heating furnace according to the arrangement scheme of the energy-saving elements;
(A3) drilling a mounting hole at the mounting position, wherein the drilling depth is more than or equal to 10 mm;
(A4) filling high-temperature adhesive (resistant to temperature over 1450 ℃), coating the high-temperature adhesive on the external thread of the mounting part of the connecting piece, inserting the mounting part into the mounting hole in a rotating manner, and removing the adhesive from the base of the mounting hole;
(A5) after the adhesive is hardened, the clamping part and part of the installation part are exposed on the inner wall of the heating furnace, the clamping part penetrates through the hole of the energy-saving element, the energy-saving element is rotated in the forward direction, and the clamping part clamps the energy-saving element; one mounting hole corresponds to the fixation of one energy saving element.
The replacement mode of the energy-saving device is as follows:
and reversely rotating the energy-saving element to enable the mounting part and the clamping part to exit the hole of the energy-saving element, thereby removing the energy-saving element.
Example 3:
an application example of the energy saving device applied to the heating furnace according to embodiment 1 of the present invention is different from embodiment 2 in that:
1. for example, the inner wall of the closed end of the energy-saving element is not provided with a groove for accommodating the part of the clamping part;
2. arranging a connecting part and a fixing part, wherein one end of the fixing part is suitable for being inserted into and fixed on a blind hole in the inner wall of the heating furnace, and the other end of the fixing part is connected with the middle part of the connecting part; the connecting part is in a shape of a straight line, two ends which are far away from each other are respectively connected with the mounting part, and the mounting part and the fixing part are arranged in parallel.
The method for installing the energy-saving device of the embodiment is different from the embodiment 2 in that:
the installation hole on the inner wall of the heating furnace realizes that two energy-saving elements are clamped on the connecting piece, namely one installation hole is fixed corresponding to the two energy-saving elements.
Of course, in order to achieve the installation of more energy saving elements, the coupling portion may be provided in an "X" shape or the like, so that the coupling portion has a plurality of ends, each of which couples the installation portion, that is, one installation hole, corresponding to the fixation of three or more energy saving elements, and the installation efficiency is further improved.
Example 4:
an application example of the energy saving device applied to the heating furnace according to embodiment 1 of the present invention is different from embodiment 2 in that:
the closed part is arranged in the energy-saving element between the closed end and the open end, the interior of the energy-saving element is divided into a first part and a second part, one end of the second part is open, and the other end of the second part is closed without a bulge or a notch, so that the energy-saving effect is improved; the first part has a groove adapted for rotation of the grip part, i.e. the groove is formed between the closing part, the energy saving element and the closed end having the through hole.
In the above embodiments, the gripping portion has a "one" shape, but may have other shapes, such as a "V" shape or an oval shape.
Comparative example:
a second branch A/B line stepping heating furnace of a certain company bar factory implements blackbody technology energy-saving transformation together in 12 months in 2019.
Aiming at two heating furnaces with the same structure, the original energy-saving element (black body element) installation process and the installation method of the embodiment 2 are respectively adopted for installation, and the specific installation and operation conditions are as follows:
Claims (10)
1. the energy-saving device comprises an energy-saving element, wherein the energy-saving element is of a hollow structure, and one end of the energy-saving element is open; characterized in that, the energy-saving device further comprises:
the connecting piece is provided with an installation part and a clamping part, and an included angle between the installation part and the clamping part is not zero; one end of the mounting part is suitable for being directly or indirectly fixed on the inner wall of the heating furnace; the connecting piece is formed by sintering the following materials: greater than 80% of a-A12O31-18% of mullite fiber, 0.1-2% of sintering aid and 0.1-2% of TiO2The above percentages are mass percentages;
the other end of the energy-saving element is provided with a hole suitable for the installation part and the clamping part to pass through; the depth of the hole is less than the length of the mounting portion, and the mounting portion is suitable for relative rotation in the hole; the energy-saving element is internally provided with a space suitable for the clamping part penetrating through the hole to relatively rotate, and the distance from the end part of the clamping part far away from the installation part to the clamping part is larger than the width of the hole.
2. The economizer of claim 1 wherein the sintering aid comprises CaO, MgO and SiO2；a-A12O3And TiO2The purity of (2) is over 99%.
3. The energy saving device of claim 1, wherein the connector further comprises:
a coupling portion for connecting a plurality of mounting portions;
and one end of the fixing part is connected with the connecting part, and the other end of the fixing part is suitable for being inserted into the inner wall of the heating furnace.
4. The energy saving device of claim 1, wherein the hole is a through hole having a length not less than a length of the clamping portion and a width not less than a thickness of the mounting portion and the clamping portion.
5. The economizer device of claim 1 wherein the space is a hollow portion of the economizer element.
6. The energy saving device of claim 1, wherein the inner wall of the other end of the energy saving element has a groove adapted to receive a portion of the gripping portion, the groove intersecting the aperture.
7. The economizer device of claim 1 wherein the other end of the economizer element has a recess, the hole, recess and open end being arranged in sequence; the space is formed in the groove.
8. The economizer device of claim 7 wherein the economizer element has an enclosure in its interior that divides the interior of the economizer element into two sections.
9. The installation method of the energy saving device according to any one of claims 1 to 8, comprising the steps of:
(A1) cleaning the inner wall of the heating furnace;
(A2) marking and positioning in the heating furnace according to the arrangement scheme of the energy-saving elements;
(A3) drilling a mounting hole at the mounting position, wherein the drilling depth is more than or equal to 10 mm;
(A4) filling adhesive into the mounting hole, and inserting the mounting part of the connecting piece into the mounting hole;
(A5) after the adhesive is hardened, the clamping part penetrates through the hole of the energy-saving element, the energy-saving element is rotated, and the clamping part clamps the energy-saving element.
10. The method of claim 9, wherein the mounting portion has an external thread that is rotatably received in the mounting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011061198.6A CN112179144A (en) | 2020-09-30 | 2020-09-30 | Energy saving device and mounting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011061198.6A CN112179144A (en) | 2020-09-30 | 2020-09-30 | Energy saving device and mounting method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112179144A true CN112179144A (en) | 2021-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011061198.6A Pending CN112179144A (en) | 2020-09-30 | 2020-09-30 | Energy saving device and mounting method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN112179144A (en) |
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| CN207422900U (en) * | 2017-11-07 | 2018-05-29 | 北京恩吉赛威节能科技有限公司 | Heating furnace hearth inner lining, heat radiator and the heating furnace for being equipped with heat radiator |
| CN207422902U (en) * | 2017-11-07 | 2018-05-29 | 北京恩吉赛威节能科技有限公司 | Heating furnace hearth inner lining, shackle member and the heating furnace for being equipped with heat radiator |
| CN110081711A (en) * | 2019-04-22 | 2019-08-02 | 东北大学 | A kind of double circular table black body radiation energy saving components and its preparation, application method |
| CN111457736A (en) * | 2020-04-01 | 2020-07-28 | 常州大学 | Porous cavity radiation black body of heating furnace wall |
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2020
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|---|---|---|---|---|
| JP2005207663A (en) * | 2004-01-22 | 2005-08-04 | Fuji Electric Systems Co Ltd | Induction heating type dry distillation furnace |
| PL387256A1 (en) * | 2009-02-12 | 2010-08-16 | Seco/Warwick Spółka Akcyjna | Retort furnace for heat tratment and for thermochemical treatment |
| CN104101213A (en) * | 2014-07-24 | 2014-10-15 | 苏州罗卡节能科技有限公司 | Energy-saving heating furnace |
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