CN221975495U - A negative pressure combustion hot air furnace system - Google Patents

Abstract

The utility model discloses a negative pressure combustion hot blast stove system, which comprises a burner, wherein the burner stretches into an inner cavity of a stove body from the end part of the stove body and heats air in the stove body, one end of the stove body is provided with an output port externally connected with negative pressure equipment, the end part of the stove body is provided with a socket for the burner to be inserted, the outer side of the end part of the stove body is provided with a supporting mechanism, and the supporting mechanism is used for fixing the burner outside the socket so that the position of the burner in the socket is constant; the annular seam is formed between the outer wall of the burner and the inner wall of the socket, and the annular seam is used for sucking cold air into the furnace body under the action of combustion air flow so as to solve the problem that the damage risk of the equipment is increased and the safety and comfort of operators are affected due to the fact that different areas of thermal stress concentration phenomenon occurs in the equipment during long-term working of the equipment on the basis of the existing furnace body structure.

Description

A negative pressure combustion hot air furnace system

Technical Field

The utility model relates to negative pressure combustion control, in particular to a negative pressure combustion hot air furnace system.

Background Art

In existing negative pressure combustion hot air furnaces, the burner is usually fixed on the furnace body. Since the negative pressure combustion hot air furnace usually needs to ensure that there is enough air inside the furnace body during the combustion process, the air can effectively adjust the gas concentration in the combustion chamber, promote the full mixing of flue gas and fuel, and ensure sufficient and efficient combustion; therefore, the pipe at the output end of the furnace body is usually connected to an external fan to maintain the negative pressure environment of the inner cavity. In order to ensure the stability of combustion, the existing burner is usually set at the entrance of the combustion chamber of the hot air furnace, which can usually be the end of the hot air furnace. When the fuel is fed into the burner and mixed with the air from the combustion fan, it burns and generates heat under the action of the ignition device of the burner. The heat is transferred through the heat exchange surface inside the hot air furnace to generate hot air.

Since the burner is the heat source in the hot blast furnace, the fuel is ignited here to produce a high-temperature airflow. The area near the burner will be the hottest area, so the hot blast furnace in this area has a higher demand for high-temperature resistant materials, which will obviously increase the manufacturing cost of the hot blast furnace. Secondly, the heat energy of the burner may be transferred to the hot blast furnace shell by conduction. Although the existing furnace body uses insulation materials to slow down the conduction of heat energy, the insulation layer has limited barrier effect. A certain amount of heat will still be transferred to the outer wall, causing the outer wall of the negative pressure combustion hot blast furnace to have a higher temperature. The increase in the temperature of the hot blast furnace shell may cause the ambient temperature in the working area to rise, affecting the safety and comfort of the operators. More importantly, long-term high temperature may cause the structural strength of the combustion chamber entrance and connecting parts to decrease, affecting their service life and causing risks in the use of the product. Therefore, it is worth studying how to optimize the existing negative pressure combustion hot blast furnace.

Utility Model Content

The purpose of the utility model is to provide a negative pressure combustion hot blast furnace system, in the hope of improving the problem that during the long-term operation of the equipment, thermal stress concentration occurs in different areas of the equipment on the basis of the existing furnace structure, resulting in an increased risk of equipment damage and affecting the safety and comfort of operators.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A negative pressure combustion hot air furnace system includes a burner, which extends from the end of the furnace body into the inner cavity of the furnace body and heats the air in the furnace body. One end of the furnace body is provided with an output port of an external negative pressure device, the end of the furnace body is provided with a socket for inserting the burner, and the outer side of the end of the furnace body is provided with a supporting mechanism, which is used to fix the burner outside the socket so that the position of the burner in the socket is constant; an annular gap is formed between the outer wall of the burner and the inner wall of the socket, and the annular gap is used to suck cold air into the furnace body under the action of the combustion airflow.

Preferably, a first cold air inlet is provided on the outer side of the end of the furnace body, and two ends of the first cold air inlet are respectively connected to the inner cavity of the furnace body and the outside atmosphere, and the first cold air inlet is used to input the outside atmosphere into the end of the furnace body.

Preferably, the side wall of the furnace body is provided with an end of a second cold air outlet, and the second cold air outlet is gradually inclined from the end of the furnace body to the output port.

A further technical solution is that there are multiple second cold air outlets, and the gaps between two adjacent second cold air outlets are the same.

Preferably, the supporting mechanism comprises a bracket, the bracket is fixed to the end of the furnace body, a fixing piece connected to the burner is provided on the bracket, and the burner is restricted on the bracket by the fixing piece.

A further technical solution is that the fixing member is any one of a lock, a clip or a buckle.

Preferably, the length of the annular seam is the same as the length of the socket, the side of the annular seam close to the supporting mechanism is the input side, the side of the annular seam close to the inner cavity of the furnace body is the output side, and the ends of the input side and the output side of the annular seam are both trumpet-shaped.

Preferably, the inner wall of the socket is provided with an airflow groove corresponding to the annular gap, the upper end of the airflow groove is connected to the annular gap, and the airflow groove is used to provide airflow to dissipate heat from the inner wall of the socket.

A further technical solution is that the air flow groove passes through the end of the furnace body, there are multiple air flow grooves, and there is a distance between two adjacent air flow grooves.

Compared with the prior art, the utility model has at least one of the following beneficial effects:

The utility model uses a burner with a socket so that the burner does not directly contact the furnace body, thereby reducing the risk of heat bridge transmission between the burner and the furnace body. By connecting a negative pressure device outside the furnace body, it can ensure that the inside of the furnace body is in a negative pressure state, which is helpful for the formation and maintenance of the combustion airflow; by designing the existence of an annular gap, cold air can be automatically inhaled, and the cold air passes through the outer wall of the burner, which can provide sufficient oxygen for combustion needs and improve combustion efficiency on the one hand; on the other hand, the annular gap can inhale cold air under the action of the combustion airflow, which is conducive to balancing the temperature of the outer wall of the burner, preventing the burner from being locally overheated, and at the same time facilitating the introduction of heat energy from the outer wall of the burner into the furnace body, effectively reducing heat energy loss.

The utility model also helps to reduce the thermal stress of the hot blast furnace material caused by temperature difference changes by balancing the furnace body temperature, thereby avoiding fatigue or damage of the material. At the same time, by arranging a first cold air port in the furnace body, a more reasonable temperature is obtained on the side of the furnace body close to the burner, the range of the hot spot area is reduced, and the service life of the equipment is effectively extended, thereby reducing long-term maintenance and replacement costs.

The utility model provides a second cold air inlet so that when the furnace body is in a negative pressure state, outside air can pass through the second cold air inlet to cover the inner wall of the furnace body and enter the furnace body cavity, so that the input of the outside atmosphere can effectively cool the temperature of the furnace body cavity, thereby controlling the combustion temperature and reducing the generation of harmful substances such as nitrogen oxides and sulfur oxides during the combustion process.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the structure of the utility model.

FIG. 2 is a schematic diagram of the position of the socket of the utility model in the furnace body.

FIG3 is a schematic diagram of the distribution of airflow slots of the utility model.

FIG. 4 is a schematic diagram of the working state of a supporting mechanism according to an embodiment.

Description of reference numerals:

1-burner, 2-furnace body, 3-support mechanism, 4-annular seam, 5-first cold air outlet, 6-second cold air outlet, 7-air flow groove, 201-output port, 202-socket, 301-bracket, 302-fixing part, A-heat collecting area.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

The output end of the current burner is generally connected to the combustion chamber of the hot blast furnace. The burner is one of the key components of the hot blast furnace, which is responsible for mixing fuel with air and igniting it to produce high-temperature combustion gas. Its combustion gas is sprayed into the combustion chamber of the hot blast furnace by the burner and burned. The burner hot blast furnace has high thermal energy. When the burner is working, the burner introduces the fuel into the furnace body, mixes it with an appropriate amount of air and ignites it. The burner can spray the fuel into the combustion area in a suitable way for combustion. This method makes it easy for the furnace body to collect heat near the burner, so that the temperature of the heat collection area is higher than that of most areas of the furnace body, thereby generating a temperature difference. Secondly, if the existing pressure combustion hot blast furnace works for a long time without stopping, on the one hand, it may cause the burner to have a thermal stress concentration phenomenon, and the long-term influence of thermal stress may cause fatigue, cracking or damage of the local material of the burner. On the other hand, the long-term local temperature difference in the furnace body may mean uneven heat energy transmission, and the thermal efficiency of the furnace body cavity decreases, which is prone to incomplete combustion, thereby increasing the risk of harmful gas emissions.

Referring to Figures 1 and 2, one embodiment of the utility model is a negative pressure combustion hot air furnace system, comprising a burner 1, wherein the burner 1 can be a burner or a combustion head of an existing furnace body, and the existing burner 1 is usually equipped with structures such as an ignition needle. The above-mentioned burner 1 extends from the end of the furnace body 2 into the inner cavity of the furnace body 2 and heats the air in the furnace body 2, and the end of the burner 1 is used for fuel spraying and ignition in the inner cavity of the furnace body 2. An output port 201 for an external negative pressure device is provided at one end of the above-mentioned furnace body 2. When the negative pressure combustion hot air furnace is working, heat energy is generated in the furnace body 2 during the combustion process and a hot air flow is formed. The hot air flow easily causes a pressure difference in the furnace body 2 to form a chimney effect.

For reference, the output end of the furnace body 2 is externally connected to a negative pressure device, which can be an existing fan or other exhaust equipment. By adjusting the interior of the furnace body 2 to a negative pressure state, the pressure inside the furnace body 2 can be lower than the pressure of the external environment.

The end of the furnace body 2 is provided with a socket 202 for inserting the burner 1, and the outer side of the end of the furnace body 2 is provided with a support mechanism 3, which is used to fix the burner 1 outside the socket 202 so that the position of the burner 1 in the socket 202 is constant.

An annular gap 4 is formed between the outer wall of the burner 1 and the inner wall of the socket 202, and the annular gap 4 is used to inhale cold air into the furnace body 2 under the action of the combustion airflow. The outside atmosphere is cold air containing oxygen, and the cold air enters from the annular gap 4. The cold air can contact the outer wall of the burner 1 in the socket 202, thereby taking away the heat energy of the burner 1 and avoiding the heat collection of the burner 1. The burner 1 and the furnace body 2 are connected through the socket 202 to directly form an insulating annular gap 4. The annular gap 4 introduces cold air into the furnace body and premixes it, thereby improving the combustion efficiency and the thermal energy utilization rate of the hot blast furnace.

For reference, referring to Figures 1 and 3, the annular gap 4 may also be partially filled with heat-resistant material to further reduce the heat transfer between the burner 1 and the furnace body 2. However, the filling of the heat-resistant material also requires sufficient pores to facilitate the entry of external cold air into the furnace body 2 from the annular gap 4.

During operation, the hot air is drained through the annular gap 4 under negative pressure, and the flow of hot air drives the formation of pressure deviation around, thereby generating suction near the annular gap 4. The suction is combined with the pressure difference of the fan, so that the outside atmosphere is automatically sucked into the furnace body 2 through the annular gap 4.

Based on the above embodiment, another embodiment of the utility model is that although the annular gap 4 can reduce the temperature near the burner 1, the airflow output by the annular gap 4 will move to the output port 201 under the action of the hot air flow after entering the furnace body 2. However, in addition to heat conduction, the burner 1 may also emit heat energy by radiation when working, thereby forming a heat collection area A in the furnace body 2. Among them, the heat collection area A is affected by the radiation effect of the high-temperature combustion gas on the one hand, and on the other hand, the position of the heat collection area A in the furnace body 2 makes the airflow output by the annular gap 4 usually not pass directly. Therefore, the temperature of the components of the structure of the heat collection area A is easy to rise during long-term use. Based on this, a first cold air port 5 is provided on the outer side of the end of the furnace body 2, and the two ends of the first cold air port 5 are respectively connected to the inner cavity of the furnace body 2 and the outside atmosphere. The first cold air port 5 is used to input the outside atmosphere to the end of the furnace body 2. Through the first cold air port 5, sufficient cold air can be inhaled to assist combustion, and the first cold air port 5 can also balance the temperature of the heat in the heat collection area A close to the burner 1. The external cold air entering through the first cold air outlet 5 can further optimize the temperature distribution and airflow dynamics in the furnace body, effectively extending the service life of the equipment.

Based on the above embodiment, another embodiment of the utility model is that, in order to further optimize the temperature distribution and airflow dynamics in the furnace body, the side wall of the furnace body 2 is provided with an end of the second cold air outlet 6, wherein the second cold air outlet 6 is arranged on the side wall of the furnace body 2, and the second cold air outlet 6 is gradually inclined from the end of the furnace body 2 to the output port 201. The gradually inclined arrangement from the end of the furnace body to the output port 201 allows the air to better enter the furnace body 2 during the process of flowing into the furnace body, and covers a wider area in the furnace body 2.

Furthermore, there are multiple second cold air outlets 6, and the gaps between two adjacent second cold air outlets 6 are the same. The second cold air outlets 6 are arranged in multiple ways. In principle, the second cold air outlets 6 can be distributed around the side walls of the furnace body 2. The uniform distribution of the second cold air outlets 6 is conducive to forming a balanced airflow. It should be noted that the second cold air outlets 6 may focus more on adjusting the temperature inside the furnace body 2 as a whole and improving the uniformity of combustion. The temperature distribution in the furnace is ensured to be uniform by introducing external air, while helping to discharge the exhaust gas after combustion. The first cold air outlet 5 may be mainly used to control the temperature near the heat collection area A, and to cool the high temperature risk that may be generated in the heat collection area A by introducing cold air, so as to protect the burner and reduce heat energy loss.

Based on the above embodiments, referring to Figures 1 and 4, another embodiment of the utility model is that the above-mentioned supporting mechanism 3 includes a bracket 301, and the above-mentioned bracket 301 is fixed to the end of the furnace body 2, wherein one end of the bracket 301 is fixed to the end of the furnace body 2 by bolts, so as to facilitate disassembly.

For reference, the bracket 301 adopts a hollow bracket structure, so that the external cold air can pass through the gap of the bracket 301 and enter the annular gap 4. At the same time, the bracket 301 can also adopt a grid structure. It should be noted that considering that the bracket 301 has a certain bearing capacity and stability requirements, a reinforcement structure can be set on the bracket 301, such as a triangular frame, and reinforcing ribs can also be considered to be installed at the stress point.

The bracket 301 is provided with a fixing member 302 connected to the burner 1, and the fixing member 302 restricts the burner 1 on the bracket 301. The fixing member 302 on the bracket 301 securely restricts the burner 1 on the bracket, which can prevent the burner from vibrating or shifting during the operation of the furnace body 2, thereby ensuring the stability of the combustion process and improving the effective conversion rate of heat energy. Secondly, the burner 1 is fixed by the bracket 301, which is convenient for the burner 1 to be easily installed or removed. This saves labor time costs and simplifies the maintenance process.

Furthermore, the fixing member 302 is any one of a lock, a clip or a buckle.

Among them, the lock is an existing product. When the fixed point of the shell of the burner 1 is a cylinder, the lock is used to lock the burner 1 on the bracket 301. Among them, the clip is an existing product. The clip is a commonly used fixing part 302. The clip is generally made of metal material and is usually curved in shape. The clip is placed between the burner 1 and the bracket 301 and fixed and clamped with bolts or nuts to make it tightly connected, so that the clip fixes the burner 1 on the bracket 301 by clamping. The clip has the characteristics of simple structure and easy installation. Among them, the buckle is also a common fixing part 302. The buckle can be made of ceramic material, and the two parts of the buckle are fixed on the burner 1 and the bracket 301 respectively. The two buckles are tightly fixed on the bracket 301 through the mutual engagement characteristics. The buckle has the advantages of simple installation, easy use, and reusability.

Based on the above embodiments, another embodiment of the utility model is that since the function of the annular gap 4 is to guide the external cold air to flow from one side of the annular gap 4 to the other side, in order to make the gas circulation of the annular gap 4 more convenient; the length of the annular gap 4 is the same as the length of the socket 202, the side of the annular gap 4 close to the support mechanism 3 is the input side, and the side of the annular gap 4 close to the inner cavity of the furnace body 2 is the output side, and the end of the input side and the end of the output side of the annular gap 4 are both arranged in a trumpet shape.

The input side and output side of the annular gap 4 are horn-shaped, which can present an expanded shape. On the one hand, the horn-shaped design of the input side can help concentrate the external air and reduce the flow velocity when entering the annular gap, thereby reducing the turbulence and resistance of the fluid to a certain extent, so that the air can enter the annular gap more smoothly;

On the other hand, the trumpet-shaped design on the output side helps to smoothly guide the fluid into the inner cavity of the furnace body, which can effectively reduce turbulence and back pressure during exit, making the pressure inside the furnace body more balanced, which is conducive to the stable progress of the combustion process.

Based on the above embodiments, referring to Figure 3, another embodiment of the utility model is that in order to ensure effective heat dissipation of the airflow and protect the equipment from heat damage, the inner wall of the above-mentioned socket 202 is provided with an airflow groove 7 corresponding to the annular seam 4, and the upper end of the above-mentioned airflow groove 7 is connected to the annular seam 4, wherein the above-mentioned airflow groove 7 is located on the inner wall of the socket 202, and cooperates with the annular seam 4 to dissipate heat. When the outside cold air flows to the socket 202, the outside cold air enters the annular seam 4 and the airflow groove 7 respectively, thereby cooling.

The above-mentioned airflow groove 7 is used to provide airflow to dissipate heat from the inner wall of the socket 202. During the operation of the burner 1, the socket 202 area of the furnace body 2 may generate high temperature accumulation due to contact with a heat source or a thermal reaction. The airflow groove 7 allows external cold air to flow in the socket 202 area of the furnace body 2, thereby taking away the heat from the inner wall of the socket 202, thereby protecting the socket 202 from excessive heating.

For reference, the airflow groove 7 is connected to the annular gap 4, which objectively increases the ventilation volume of the socket 202, avoiding material degradation, structural damage or performance degradation caused by local overheating of the socket 202 and the burner 1. In addition, the airflow groove 7 allows the flowing gas to directly contact the inner wall of the socket 202, thereby significantly improving the cooling effect and heat exchange efficiency, reducing the risk of thermal stress near the socket 202, which is very beneficial to improving the service life of the socket 202 and the entire furnace body 2, and reducing the maintenance and replacement costs of the burner 1 due to overheating.

Furthermore, the air flow groove 7 runs through the end of the furnace body 2, and there are multiple air flow grooves 7. The multiple air flow grooves 7 can further increase the contact area between the inner wall of the furnace body and the flowing cooling gas, which is conducive to improving the efficiency of heat exchange. There is a spacing between two adjacent air flow grooves 7. By reasonably arranging multiple air flow grooves and setting appropriate spacing, the furnace body 2 can be effectively cooled.

For reference, each airflow slot can provide an independent cooling channel, so that the cold air can dissipate heat more evenly. At the same time, there is a certain distance between two adjacent airflow slots, which can ensure that each airflow slot can perform its cooling function independently, avoid mutual interference of airflow in the channel, and improve the fluidity of the cooling gas.

The "one embodiment", "another embodiment", "embodiment", "preferred embodiment" and the like mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

Although the utility model is described herein with reference to a plurality of illustrative embodiments of the utility model, it should be understood that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the disclosure, drawings, and claims of the present application, various modifications and improvements may be made to the components and/or layout of the subject combination layout. In addition to the modifications and improvements made to the components and/or layout, other uses will also be apparent to those skilled in the art.

Claims (9)

1. A negative pressure combustion hot air furnace system, comprising a burner (1), wherein the burner (1) extends from the end of a furnace body (2) into the inner cavity of the furnace body (2) and heats the air in the furnace body (2), and an output port (201) for an external negative pressure device is provided at one end of the furnace body (2), characterized in that: The end of the furnace body (2) is provided with a socket (202) for inserting the burner (1), and the outer side of the end of the furnace body (2) is provided with a support mechanism (3), and the support mechanism (3) is used to fix the burner (1) outside the socket (202) so that the position of the burner (1) in the socket (202) is constant; An annular gap (4) is formed between the outer wall of the burner (1) and the inner wall of the socket (202), and the annular gap (4) is used to draw cold air into the furnace body (2) under the action of the combustion airflow. 2. The negative pressure combustion hot air furnace system according to claim 1 is characterized in that a first cold air port (5) is provided on the outer side of the end of the furnace body (2), and the two ends of the first cold air port (5) are respectively connected to the inner cavity of the furnace body (2) and the outside atmosphere, and the first cold air port (5) is used to input the outside atmosphere into the end of the furnace body (2). 3. The negative pressure combustion hot air furnace system according to claim 1 is characterized in that: the side wall of the furnace body (2) is provided with an end of a second cold air port (6), and the second cold air port (6) is gradually inclined from the end of the furnace body (2) to the output port (201). 4. The negative pressure combustion hot air stove system according to claim 3, characterized in that: there are multiple second cold air ports (6), and the gaps between two adjacent second cold air ports (6) are the same. 5. The negative pressure combustion hot air furnace system according to claim 1 is characterized in that: the supporting mechanism (3) includes a bracket (301), the bracket (301) is fixed to the end of the furnace body (2), and the bracket (301) is provided with a fixing part connected to the burner (1), and the burner (1) is restricted on the bracket (301) by the fixing part (302). 6. The negative pressure combustion hot blast stove system according to claim 5, characterized in that the fixing member (302) is any one of a lock, a clip or a buckle. 7. The negative pressure combustion hot air furnace system according to claim 1 is characterized in that: the length of the annular seam (4) is the same as the length of the socket (202), the side of the annular seam (4) close to the support mechanism (3) is the input side, and the side of the annular seam (4) close to the inner cavity of the furnace body (2) is the output side, and the end of the input side and the end of the output side of the annular seam (4) are both arranged in a trumpet shape. 8. The negative pressure combustion hot air furnace system according to claim 1 is characterized in that: the inner wall of the socket (202) is provided with an air flow groove (7) corresponding to the annular gap (4), the upper end of the air flow groove (7) is connected to the annular gap (4), and the air flow groove (7) is used to supply air flow to dissipate heat from the inner wall of the socket (202). 9. The negative pressure combustion hot air furnace system according to claim 8 is characterized in that: the air flow groove (7) runs through the end of the furnace body (2), there are multiple air flow grooves (7), and there is a distance between two adjacent air flow grooves (7).