CN212451524U - Improve radiant tube roller hearth furnace low temperature and do not have oxidation heat treatment system - Google Patents
Improve radiant tube roller hearth furnace low temperature and do not have oxidation heat treatment system Download PDFInfo
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- CN212451524U CN212451524U CN202022106924.3U CN202022106924U CN212451524U CN 212451524 U CN212451524 U CN 212451524U CN 202022106924 U CN202022106924 U CN 202022106924U CN 212451524 U CN212451524 U CN 212451524U
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Abstract
The utility model belongs to the technical field of heat treatment furnace non-oxidation atmosphere circulation, concretely relates to improve radiant tube roller hearth furnace low temperature non-oxidation heat treatment system. The roller hearth furnace comprises a protective gas circulating heating device arranged on a furnace body, and the roller hearth furnace consists of an independent combustion chamber, a heat exchanger and a circulating fan, wherein the independent combustion chamber is connected with the heat exchanger through a hot flue gas pipe; the hot protective gas collecting pipe is also communicated with the hearth through a protective gas input pipe. The utility model provides a poor problem of low temperature homogeneity of radiant tube heating, guarantee under the lower furnace temperature condition of 100 ℃ -300 ℃, through protective gas circulation heating, when each temperature does not have the oxidation, fully guarantee low temperature homogeneity, can reach within 3 ℃.
Description
Technical Field
The utility model belongs to the technical field of the thermal treatment furnace does not have the oxidizing atmosphere circulation, concretely relates to improve radiant tube type roller hearth furnace low temperature does not have oxidizing atmosphere's roller hearth type thermal treatment furnace is applicable to radiant tube heating no oxidizing atmosphere such as cut deal, steel pipe, rod, steel wire coil.
Background
The heat treatment of medium plate includes quenching, normalizing, high, medium and low temperature tempering. The quenching is generally heated by adopting a radiant tube, nitrogen is introduced into the furnace for protection, and the surface of the steel plate is ensured not to be oxidized during high-temperature quenching, so that good surface quality of the steel plate is obtained. The tempering temperature range after quenching is generally 150-800 ℃, different tempering temperatures are adopted according to different steel types, for high-strength wear-resistant steel series, on the premise of ensuring the hardness of the steel plate, in order to eliminate the internal stress of the steel plate, the steel plate needs to be heated for low-temperature tempering, a heat treatment process of quenching and low-temperature tempering is adopted, and the temperature uniformity of the low-temperature tempering is required to be within +/-5 ℃. The temperature of the hearth of the heat treatment furnace adopted in the working procedure is lower, generally below 300 ℃, in order to meet the requirements of the heat treatment process, the furnace temperature is required to be uniform, and the integral temperature difference of the steel plate is less than or equal to +/-5 ℃.
For low-temperature tempering, because the radiant tube has low heating efficiency and poor temperature uniformity, the conventional treatment method is open fire heating, and the heat transfer in a low-temperature flame furnace is mainly convection heat transfer, so that better temperature uniformity is obtained. However, the open fire heating needs to be independently provided with an open fire heat treatment furnace, the surface of the steel plate is oxidized, the surface quality of the steel plate cannot be guaranteed, the steel plate is often subjected to surface treatment again before delivery, and the cost is high. The heat transfer in the furnace at low temperature is mainly convection heat transfer, and the factors influencing the convection heat transfer effect are many, wherein the most important factor is the speed of a heat transfer medium on the surface of a heated part, namely the flow velocity of airflow on the surface of the heated part is increased, the turbulence degree of the fluid is increased, and the thermal resistance is correspondingly reduced by thinning a boundary layer. Therefore, the high-speed recirculation of the heat transfer medium on the surface of the heated member is the most effective method for enhancing the convection heat transfer.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an improved radiant tube type roller hearth furnace low-temperature non-oxidation heat treatment system, which aims to solve the problem of poor low-temperature uniformity of radiant tube heating in low-temperature non-oxidation treatment.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a kind of improvement radiant tube roller hearth furnace low temperature does not have oxidation heat treatment system, including setting up the protective gas circulation heating arrangement on the furnace body, it is made up of independent combustion chamber, heat exchanger and circulating fan, the independent combustion chamber is connected with heat exchanger through the hot flue gas pipe, and connect with the smoke exhaust pipe communicated with hot flue gas pipe on the heat exchanger, and the protective gas delivery pipe with circulating fan and communicating with furnace chamber of the furnace body, the hot protective gas header communicated with protective gas delivery pipe; the hot protective gas collecting pipe is also communicated with the hearth through a protective gas input pipe.
Furthermore, the independent combustion chamber is provided with a single or a plurality of combustors.
Furthermore, the independent combustion chamber, the heat exchanger and the circulating fan are all arranged on the furnace top of the furnace body.
Furthermore, thermal protection gas collecting pipes are respectively arranged on two sides of the furnace body, a plurality of protection gas input pipes are arranged on the thermal protection gas collecting pipes at intervals along the length direction of the thermal protection gas collecting pipes, and pulse electromagnetic valves are arranged on the protection gas input pipes.
Furthermore, the protective gas input pipes on two sides of the furnace body are arranged in a one-to-one correspondence mode, and the protective gas input pipes on one side are arranged in an up-and-down correspondence mode relative to the furnace rollers in the furnace body.
Furthermore, a stop valve is arranged on the protective gas output pipe and between the hearth and the circulating fan.
By adopting the scheme, at high temperature, the high-speed self-preheating type burner radiant tube is adopted for heating, the nitrogen is used for protection, and the oxygen content in the furnace is lower than 100 ppm; at low temperature, the nitrogen protective gas in the furnace is utilized to independently circulate. The system is characterized in that a protective gas outlet is arranged ON the furnace top, protective gas is pumped out through a circulating fan and then enters a heat exchanger, the protective gas and an independent combustion chamber arranged ON the furnace top supply heat to be subjected to heat exchange heating in the heat exchanger, the heated protective gas is dispersed to the two sides of a furnace hearth through a thermal protective gas collecting pipe, protective gas input pipes with gas nozzles are arranged above and below the furnace hearth through a steel wire, and high-temperature-resistant ON/OFF pulse electromagnetic valves are arranged ON the protective gas input pipes to perform corresponding pulse control. Therefore, the atmosphere in the hearth is disturbed by the high-temperature protective airflow sprayed at a high speed, convection is formed on the upper surface and the lower surface of the steel plate, so that a uniform heat source is formed in the furnace, and the good temperature uniformity of the hearth and the steel plate can be realized under the working condition of ensuring no oxidation in the furnace.
The utility model has the advantages that: the utility model provides an improved radiant tube type roller hearth furnace low-temperature non-oxidation heat treatment system, which has the function of high-temperature non-oxidation heat treatment and simultaneously ensures that the low-temperature heat treatment obtains good temperature uniformity; meanwhile, the method can ensure that the surface of the heated part is not oxidized, thereby obtaining good mechanical property and surface quality, is suitable for heat treatment roller-hearth heat treatment furnaces of medium and thick plates, steel pipes, bars, steel wire coils and the like, and has multiple purposes by one furnace, namely quenching can be realized on the same furnace type, and ultralow temperature tempering can also be realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic plan view of the improved radiant tube type roller hearth furnace low-temperature non-oxidation heat treatment system of the present invention.
Fig. 2 is a schematic view of the low temperature cycle of the shielding gas in fig. 1.
Reference numerals: the device comprises a furnace body 1, furnace rollers 2, a radiant tube 3, a combustor 4, an independent combustion chamber 5, a hot flue gas tube 6, a heat exchanger 7, a circulating fan 8, a hot protective gas collecting tube 9, a pulse electromagnetic valve 10, a heated piece 11, a smoke exhaust tube 12, a protective gas output tube 13 and a protective gas input tube 14.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Referring to fig. 1 and 2, the improved radiant tube type roller hearth furnace low-temperature non-oxidation heat treatment system provided in this embodiment includes a shielding gas circulation heating device disposed on a furnace body 1, and the shielding gas circulation heating device is composed of an independent combustion chamber 5, a heat exchanger 7 and a circulation fan 8, the independent combustion chamber 5 is connected with the heat exchanger 7 through a hot flue gas pipe 6, and the heat exchanger 7 is further connected with a smoke exhaust pipe 12 communicated with the hot flue gas pipe 6, a shielding gas output pipe 13 communicated with a furnace chamber of the furnace body 1 and provided with the circulation fan 8, and a hot shielding gas header pipe 9 communicated with the shielding gas output pipe 13; the thermal protection gas collecting pipe 9 is also communicated with the hearth through a protection gas input pipe 14; the independent combustion chamber 5, the heat exchanger 7 and the circulating fan 8 are uniformly distributed on the top of the furnace body 1; the independent combustion chamber is provided with a combustor 4; the two sides of the furnace body 1 are respectively provided with a thermal protection gas collecting pipe 9, and the thermal protection gas collecting pipe 9 is provided with a plurality of protection gas input pipes 14 which are arranged at intervals along the length direction; the protective gas input pipes 14 on the two sides of the furnace body 1 are respectively arranged in a one-to-one correspondence mode, and the protective gas input pipes 14 on one side are arranged in an up-and-down correspondence mode relative to the furnace rollers 2 in the furnace body 1. By adopting the scheme, in the low temperature, in order to solve the problems of low heating efficiency and poor temperature uniformity of the radiant tube, the protective gas circulation heating device is independently arranged to ensure uniform heating temperature; namely, the protective gas is supplied through the heat exchange of the combustion flue gas, thereby realizing the heat supply for the furnace protective gas.
The protective gas input pipe 14 in the embodiment is provided with the pulse electromagnetic valve 10, the atmosphere in the hearth is disturbed by high-temperature protective gas flow sprayed at high speed through the alternate pulse control of the pulse electromagnetic valve, so that convection is formed on the upper surface and the lower surface of the heated part 11, a uniform heat source is formed in the furnace, and the good temperature uniformity of the hearth and the heated part is realized under the condition that no oxidation exists in the furnace.
In the present embodiment, a single or a plurality of burners 4 are provided on the individual combustion chambers 5. The heat supply mode can be controlled in a pulse mode or a continuous mode, the independent combustion chamber is an independent system, and a protective gas circulation system can not be opened when the roller hearth furnace body is subjected to high-temperature heat treatment. The independent combustion chamber is provided with an independent smoke exhaust pipe, and the smoke is subjected to heat exchange with the protective gas through a hot smoke flue, so that low-temperature emission is realized, energy is saved, and consumption is reduced.
A shut-off valve (not shown) is arranged on the independent protection gas output pipe 13 in the embodiment and between the furnace and the circulating fan 8. Like this, when furnace high temperature, need not carry out the protection gas circulation, then be provided with high temperature resistant trip valve on the protection gas output tube, protection circulating fan when no protection gas circulation.
The mode for improving the low-temperature non-oxidation heat treatment system of the radiant tube type roller hearth furnace is as follows: the protective gas in the furnace body hearth is pumped and regulated out by utilizing a circulating fan; providing hot flue gas by using an independent combustion chamber, and carrying out heat exchange type heating on the extracted protective gas in a heat exchanger; and convectively conveying the heated protective gas back to the furnace body hearth by using a pulse electromagnetic valve.
Specifically, protective gas (nitrogen) is pumped out through a furnace top circulating fan, enters a heat exchanger, exchanges heat with hot flue gas generated by an independent combustion chamber, achieves the purpose of heating the protective gas, and is sprayed back into a hearth in a pulse type convection mode through protective gas input pipes on two sides of a furnace body to form uniform circulating airflow, so that good low-temperature uniformity is obtained in an environment without oxidation.
The method also comprises the steps of obtaining the temperature of the extracted and adjusted protective gas and controlling the heating of the protective gas conveyed back to the hearth according to the obtained temperature of the protective gas. The subsequent heating and feedback of the protective gas can be controlled according to the temperature of the pumped protective gas, for example, the conveying amount, frequency and the like of the protective gas can be controlled.
The following describes in detail the improved radiant tube type roller hearth furnace low temperature non-oxidation heat treatment system implemented in the following examples for non-oxidation heat treatment of steel sheets. According to the process requirements, the requirement of non-oxidation heat treatment within the range of 100-300 ℃ is met while the high-temperature heat treatment above 300 ℃ is considered, so that good surface quality and product performance are obtained.
High-temperature non-oxidation heat treatment: the heated piece 11 (steel plate) is transported by the furnace roller 2, the radiant tube 3 is arranged above and below the furnace roller 2, and nitrogen protective gas is filled in the furnace. The radiant tube burners are arranged in a staggered manner and are arranged at two sides of the furnace body 1, and each side is divided into an upper row and a lower row for heating the heated piece 11 (steel plate) up and down. When the heat treatment is carried out at the temperature of 300-1000 ℃, the pulse heating is carried out through the burners of the radiant tubes 3 arranged at the two sides in a staggered mode, nitrogen protective gas is introduced into the furnace, and the burners of the radiant tubes arranged in the staggered mode form a plurality of heat sources to uniformly heat the heated piece 11.
Low-temperature non-oxidation heat treatment: at the heat treatment temperature of 100-300 ℃, heat transfer in the furnace is mainly convection heat transfer, and at the moment, the furnace is heated by the radiant tube, so that the heating hysteresis is large, the heat transfer efficiency of the radiant tube is low, and the temperature uniformity of the heated part 11 (steel plate) is poor. Under this condition, the protective gas circulation heating device is started. An independent combustion chamber 5 arranged on the top of the furnace is heated by a burner 4, hot flue gas passes through a heat exchanger 7 and is supplied to a stable heat source of protective gas, and the flue gas is discharged through a smoke discharge pipe 12 after heat exchange. Meanwhile, the nitrogen protection gas in the furnace is pumped out through a furnace top protection gas output pipe and enters a heat exchanger 7 through a circulating fan 8, and after the nitrogen protection gas exchanges heat with hot flue gas from the combustion chamber 5, the nitrogen protection gas is distributed to the upper side and the lower side of the furnace body through hot protection gas collecting pipes arranged on the two sides of the furnace body. A plurality of protective gas input pipes are arranged on the upper side and the lower side of the furnace body, and each protective gas input pipe is provided with a pulse electromagnetic valve for providing pulse control.
The roller hearth furnace of the embodiment adopts the nitrogen protection radiant tube for heating, and when having the function of high-temperature non-oxidation heat treatment, the roller hearth furnace ensures that the roller hearth furnace obtains good temperature uniformity in low-temperature heat treatment and ensures that the surface is free of oxidation. Therefore, the roller hearth type heat treatment furnace has good mechanical property and surface quality, is suitable for heat treatment of medium and thick plates, has multiple purposes, can realize quenching on the same furnace type and can also realize ultra-low temperature tempering. The temperature uniformity of the steel plate meets the requirement, and the temperature difference of each point of the steel plate discharged from the furnace is within the range of +/-3 ℃ through a thermocouple burying test.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (6)
1. The system is characterized by comprising a protective gas circulating heating device arranged on a furnace body (1), and the protective gas circulating heating device consists of an independent combustion chamber (5), a heat exchanger (7) and a circulating fan (8), wherein the independent combustion chamber is connected with the heat exchanger through a hot flue gas pipe (6), the heat exchanger is also connected with a smoke exhaust pipe (12) communicated with the hot flue gas pipe, a protective gas output pipe (13) communicated with a hearth of the furnace body and provided with the circulating fan, and a hot protective gas collecting pipe (9) communicated with the protective gas output pipe; the hot protective gas collecting pipe is also communicated with the hearth through a protective gas input pipe (14).
2. The improved radiant tube type roller hearth furnace low-temperature non-oxidizing heat treatment system as claimed in claim 1, wherein said independent combustion chamber is provided with a single or multiple burners (4).
3. The improved radiant tube type roller hearth furnace low-temperature non-oxidation heat treatment system according to claim 1, wherein the independent combustion chamber, the heat exchanger and the circulating fan are all arranged on the furnace top of the furnace body.
4. The improved radiant tube type roller hearth furnace low-temperature non-oxidation heat treatment system as claimed in claim 1, wherein thermal protection gas headers are respectively arranged at two sides of the furnace body, a plurality of protection gas input tubes are arranged on the thermal protection gas headers at intervals along the length direction of the thermal protection gas headers, and pulse electromagnetic valves (10) are arranged on the protection gas input tubes.
5. The improved radiant tube type roller hearth furnace low-temperature non-oxidation heat treatment system according to claim 4, wherein the protective gas input pipes on two sides of the furnace body are arranged in a one-to-one correspondence manner, and the protective gas input pipes on one side are arranged in an up-and-down correspondence manner relative to the furnace rollers (2) in the furnace body.
6. The improved radiant tube type roller hearth furnace low-temperature non-oxidation heat treatment system according to claim 1, wherein a stop valve is arranged on the protective gas output pipe and between the hearth and the circulating fan.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022106924.3U CN212451524U (en) | 2020-09-23 | 2020-09-23 | Improve radiant tube roller hearth furnace low temperature and do not have oxidation heat treatment system |
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| CN202022106924.3U CN212451524U (en) | 2020-09-23 | 2020-09-23 | Improve radiant tube roller hearth furnace low temperature and do not have oxidation heat treatment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112029972A (en) * | 2020-09-23 | 2020-12-04 | 重庆赛迪热工环保工程技术有限公司 | Method and system for improving low-temperature non-oxidation heat treatment of radiant tube type roller hearth furnace |
| CN116213874A (en) * | 2023-05-05 | 2023-06-06 | 西科沃克瑞泰克热处理设备制造(天津)有限公司 | Double preheating system for replacing nitrogen in batch furnace feeding chamber and indoor gas |
-
2020
- 2020-09-23 CN CN202022106924.3U patent/CN212451524U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112029972A (en) * | 2020-09-23 | 2020-12-04 | 重庆赛迪热工环保工程技术有限公司 | Method and system for improving low-temperature non-oxidation heat treatment of radiant tube type roller hearth furnace |
| CN116213874A (en) * | 2023-05-05 | 2023-06-06 | 西科沃克瑞泰克热处理设备制造(天津)有限公司 | Double preheating system for replacing nitrogen in batch furnace feeding chamber and indoor gas |
| CN116213874B (en) * | 2023-05-05 | 2023-08-11 | 西科沃克瑞泰克热处理设备制造(天津)有限公司 | Double preheating system for replacing nitrogen in batch furnace feeding chamber and indoor gas |
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