CN201724547U - Heat-accumulation lead melting furnace - Google Patents

Abstract

The utility model discloses a heat storage lead melting furnace, which comprises a pot body, a furnace body and two heat storage combustion assemblies. The pot body is placed on the furnace body, and the furnace body is separated into two independent heating chambers by a partition wall. Each heating cavity communicates with a regenerative combustion assembly through the flue gas pipe opened on the furnace body. The regenerative combustion assembly is installed on the outside of the furnace body. section and the regenerative section used to provide high-temperature air for the combustion section, and the combustion section communicates with the heating chamber through the flue gas pipe. The utility model has the advantages of simple and compact structure, small volume, convenient installation and maintenance, good heating effect, long service life and the like.

Description

A regenerative lead melting furnace

technical field

The utility model mainly relates to the field of metal melting and refining equipment, in particular to a metal lead melting equipment.

Background technique

At present, non-ferrous enterprises have been using chamber combustion indirect heating to melt and refine lead. The furnace body is composed of a combustion chamber and a heating section. The combustion chamber produces high-temperature flue gas of about 1100 ° C and enters the heating section of the furnace body to directly heat the lead melting pot, gradually melting the lead block in the pot and performing refining treatment. After heating, the flue gas temperature is still as high as 1000°C. After simple treatment, it is directly evacuated, so the thermal efficiency of this furnace type is very low. Due to the frequent fluctuations of the flue gas in the lead melting and refining process, the fluctuating range is huge, and the high-temperature waste heat recovery method of metal heat exchanger is used to recover the flue gas. The heat exchanger is easy to exceed the high temperature range it can withstand, and the service life is difficult to guarantee.

In the past two years, with the rise of regenerative combustion technology, some enterprises have improved the furnace type according to regenerative combustion. A very obvious energy-saving effect has been achieved. The improved technology still divides the furnace body into two parts, the combustion chamber and the heating section, and divides the combustion section into two independent parts symmetrically with a partition wall. Each part is equipped with a main burner (also the main smoke exhaust port), and a matching ball Bed ceramic regenerator and an air/flue gas switching device. During normal production, the air/flue gas switching device switches direction at a fixed time, and the high-temperature flue gas/cold air alternately exchanges heat directly with the regenerator of the ceramic regenerator. The temperature of the flue gas exhausted in the hot chamber is cooled to below 200°C, and the waste heat of the flue gas is recovered to the maximum extent and then returned to the furnace. The combustion/smoke exhaust functions of the two burners are carried out alternately. When one burner is in the combustion state, the other burner acts as the main exhaust port for smoke exhaust. Each main burner is equipped with an open flame, which can ensure that the gas and high-temperature hot air can be ignited and burned in time when the burner is switched alternately every time it is in the main combustion stage; the high-temperature air is periodically injected into the gas before entering the furnace nozzle, and pre-mixed to make the flame fills the entire combustion chamber.

As shown in Figures 8 and 9, the existing structure generally includes a pot body 1 and a furnace body 2. The furnace body 2 is divided into two parts, the furnace body combustion section and the furnace body heating section, and the furnace body combustion section is symmetrically divided into two parts with a partition wall 3. Independent parts, each part is equipped with a set of ceramic ball regenerator 6. The interface between the ceramic ball regenerator 6 and the combustion section of the furnace body is connected by a main burner 61 (also the main smoke exhaust port). The side of the main burner 61 is provided with a permanent burner 62, and the upper part is provided with a main gas inlet. Spout 63. Ceramic ball regenerator 6 is provided with ceramic regenerator ball 65, and the regenerator cold air inlet 64 (also flue gas outlet) on the ceramic ball regenerator 6 is connected with an air/flue gas switching device. The flue gas switching device reverses the direction of air/flue gas at a fixed time, and the high-temperature flue gas/cold air in the ceramic ball regenerator 6 alternately exchanges heat directly with the ceramic heat storage ball 65, and the temperature of the hot air exiting the ceramic ball regenerator 6 It can be preheated to over 800°C, mixed with the gas coming out of the upper main gas inlet nozzle 63 in the main burner 61, ignited by the side permanent burner 62 in the furnace body 2, and ignited and burned. The temperature of the flue gas discharged from the ceramic ball regenerator 6 is cooled to below 200° C., and discharged alternately.

Although the furnace type of this structure has achieved very obvious energy-saving effect. However, the furnace body occupies a large area. Since the combustion chamber and the heating section are directly connected without a partition in the middle, the gas and high-temperature air begin to mix and burn in the combustion chamber. The length of the flame is determined by the ratio of gas to air and the mixing effect. When the flame is long, it may directly contact the heated pot body, causing local high temperature overheating and burning of the pot body; moreover, the regenerator uses heat storage balls as the heat exchange medium , the heat exchange specific surface area is small, the required volume is too large, the equipment volume is too large, and the equipment foundation of the regenerator is lower than the furnace body foundation, which increases the cost of the foundation; at the same time, the resistance of air and flue gas passage is relatively large, requiring The power provided is also large, resulting in high wind pressure and high energy consumption of the blower and induced draft fan.

Utility model content

The technical problem to be solved by the utility model is: aiming at the technical problems existing in the prior art, the utility model provides a regenerative lead-melting furnace with simple and compact structure, small volume, good heating effect and long service life.

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

A regenerative lead-melting furnace, comprising a pot body, a furnace body and two regenerative combustion assemblies, the pot body is placed on the furnace body, and the furnace body is divided into two independent heating chambers by a partition wall. It is characterized in that each of the heating chambers communicates with a heat storage combustion assembly through a flue gas pipe opened on the furnace body, and the heat storage combustion assembly is installed on the outside of the furnace body, and the heat storage combustion assembly includes A combustion section for generating high-temperature gas for heating and a heat storage section for providing high-temperature air to the combustion section. The combustion section communicates with the heating cavity through a flue gas pipe.

As a further improvement of the utility model:

The heat storage section is located above or below the combustion section, and the heat storage section includes a heat storage chamber, a honeycomb heat storage body and an air intake pipe installed at the end of the heat storage chamber, and the honeycomb heat storage body is equipped with Located in the heat storage chamber, the air intake pipe is equipped with a switching device for controlling the conduction of the air intake pipe with the outside air or with the furnace body, and the honeycomb heat storage body is supported on the heat storage body by the heat storage body bracket. Hot indoors.

The combustion section and the heat storage section are horizontally arranged. The heat storage section includes a heat storage chamber, a honeycomb heat storage body and an air intake pipe installed on the heat storage chamber. The honeycomb heat storage body Installed in the heat storage chamber, the air inlet pipe is equipped with a switching device for controlling the conduction between the air inlet pipe and the outside air or with the furnace body.

The combustion section includes a combustion chamber, an eternal flame device and a main gas nozzle installed on the combustion chamber.

The furnace body is provided with a straight exhaust port.

The heat storage body adopts a honeycomb heat storage body.

Compared with the prior art, the utility model has the advantages of:

1. In the regenerative lead melting furnace of the present utility model, the regenerative combustion assembly is installed outside the furnace body, that is, it is independent from the furnace body, and only the heating section is reserved in the furnace body, which simplifies the structure of the furnace body. In this way, the gas and high-temperature air are directly mixed and burned in the regenerative combustion assembly, and the high-temperature waste gas after combustion enters the heating section at high speed and contacts the heated pot body. Since there is no high-temperature flame in the furnace body, local high temperature of the pot body can be avoided. The heat transfer effect is enhanced to appropriately reduce the flue gas circulation space.

2. In the heat storage lead melting furnace of the present utility model, the combustion section of the heat storage combustion assembly and the heat storage section are arranged horizontally, and the heat storage body can be placed directly on the lower wall of the heat storage chamber without setting up a heat storage unit. The thermal body tray device can simplify the structure of the regenerator.

3. In the regenerative lead melting furnace of the present utility model, the honeycomb regenerator is used instead of the regenerator ball as the heat exchange medium, which increases the specific surface area of heat exchange, reduces the volume of the regenerator on the one hand, and makes it more efficient on the other hand. The foundation is consistent with the furnace body; at the same time, the resistance of air and flue gas passing through the honeycomb heat storage body is lower than that of the heat storage ball, and the air pressure of the blower and induced draft fan can also be reduced accordingly.

Description of drawings

Fig. 1 is a schematic view of the top view structure when a rectangular furnace body is adopted and the heat storage section is located below the combustion section in a specific embodiment;

Fig. 2 is a schematic diagram of the front view of the specific embodiment when a rectangular furnace body is used and the heat storage section is located below the combustion section;

Fig. 3 is a schematic view of the top view structure when the cylindrical furnace body is adopted and the heat storage section is located below the combustion section in the specific embodiment;

Fig. 4 is a schematic diagram of the front view when the cylindrical furnace body is adopted and the heat storage section is located below the combustion section in the specific embodiment;

Fig. 5 is a schematic diagram of the front view of the specific embodiment when the heat storage section is located above the combustion section;

Fig. 6 is a top view structural diagram when the combustion section and the heat storage section are horizontally arranged in a specific embodiment of the utility model;

Fig. 7 is a schematic diagram of the main structure of the specific embodiment of the utility model when the combustion section and the heat storage section are arranged horizontally;

Fig. 8 is a front structural schematic diagram of a heat storage lead-melting furnace in the prior art;

Fig. 9 is a top structural schematic view of a heat storage lead melting furnace in the prior art.

illustration:

1. Pot body; 2. Furnace body; 21. Heating cavity; 22. Flue gas pipe; 23. Straight smoke outlet; 3. Partition wall; 4. Left regenerative combustion component; 5. Right regenerative combustion component; 41, combustion section; 411, combustion chamber; 412, permanent flame device; 413, main gas nozzle; 42, heat storage section; 421, heat storage chamber; 422, heat storage body; 423, intake pipe; 424, heat storage 6. Ceramic ball regenerator; 61. Main burner; 62. Changming burner; 63. Main gas inlet; 64. Cold air inlet of regenerator; 65. Ceramic heat storage ball.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

The regenerative lead-melting furnace of the present utility model includes a pot body 1, a furnace body 2 and two regenerative combustion components. The furnace body 2 can adopt a rectangle as shown in FIG. 1 and FIG. columnar. The pot body 1 is placed on the furnace body 2, and the furnace body 2 only retains the heating area of the pot body 1, and the furnace body 2 is divided into two independent heating chambers 21 by a partition wall 3, which separates the high-temperature flue gas inlet and outlet sections , to ensure that the high-temperature flue gas flows around the pot body 1 as much as possible in the furnace body 2 to enhance heat exchange. Each heating cavity 21 communicates with a regenerative combustion assembly through a flue gas pipe 22 provided on the furnace body 2. The regenerative combustion assembly is arranged in pairs and arranged on the same side of the furnace body 2, one on the left and one on the right. In this embodiment, they are respectively the left regenerative combustion assembly 4 and the right regenerative combustion assembly 5, both of which have the same structure. Each regenerative combustion assembly includes a combustion section 41 for generating high-temperature gas for heating and a heat storage section 42 for providing high-temperature air to the combustion section 41. The combustion section 41 is located above the heat storage section 42, and the combustion section 41 passes through The flue gas pipe 22 communicates with the heating cavity 21 . In this embodiment, the heat storage section 42 includes a heat storage chamber 421, a heat storage body 422, and an air intake pipe 423 installed at the bottom of the heat storage chamber 421. The heat storage body 422 is installed in the heat storage chamber 421. At this time, the two The gas between them flows up and down, and the lower part of the heat storage body 422 must be fixed by a tray device that allows air flow to pass through, so the heat storage body 422 is supported in the heat storage chamber 421 by the heat storage body bracket 424 . Since the heat storage section 42 is arranged below the combustion section 41, the lower part of the heat storage body 422 is always in a low temperature region, and the heat storage body bracket 424 can adopt a conventional structure, and has a long service life. The air intake pipe 423 is equipped with a switching device for controlling the conduction of the air intake pipe 423 with the outside air or with the furnace body 2, and the switching device is a timing switching device. The heat storage body 422 uses a honeycomb heat storage body instead of heat storage balls as the heat exchange medium, which is beneficial to reduce the volume of the heat storage chamber 421 . The combustion section 41 includes a combustion chamber 411 , an overhead flame device 412 and a main gas nozzle 413 installed on the combustion chamber 411 . In the working state, through the timing switching device, the heat storage and heat exchange combustion functions of the two regenerative combustion components can alternate with each other, but the combustion section 41 is provided with an eternal flame device 412, which should always keep the burning state. When the left regenerative combustion assembly 4 is in the heat exchange combustion state, the right regenerative combustion assembly 5 is in the heat storage state. At this time, the cold air enters the heat storage section 42 from the intake pipe 423 at the bottom of the left heat storage combustion assembly 4, and is heated by the high-temperature heat storage body 422. After heating, the air temperature is as high as 800° C. The combustion section 41 is mixed with the gas entering from the main gas nozzle 413 , ignited by the permanent flame device 412 and then ignited and burned to form high-temperature flue gas that can meet the requirements of the furnace body 2 . The high-temperature flue gas enters the furnace body 2 from the flue gas pipe 22 and is used to heat the pot body 1 . The high-temperature flue gas discharged from the furnace body 2 enters the right regenerative combustion assembly 5 from the flue gas pipe 22. At this time, the main gas nozzle 413 of the right regenerative combustion assembly 5 is closed, and the high-temperature flue gas directly enters the regenerative section 42 for heating and has been cooled. The heated heat storage body 422, the temperature of the flue gas coming out of the heat storage body 422 drops below 200°C, and finally it is discharged from the flue gas pipe 22 at the bottom of the heat storage section 42.

After a period of time, through the timing switching device, the left regenerative combustion assembly 4 switches from the heat exchange combustion state to the heat storage state, and the right regenerative combustion assembly 5 switches from the heat storage state to the heat exchange combustion state. The gas flow direction is reversed to the above process. No longer expressed here. Similarly, referring to Fig. 5, the combustion section 41 can also be located below the heat storage section 42, but since the lower part of the heat storage body 422 is always in a high temperature zone (>1000°C), the heat storage body bracket 424 must be made of a material capable of long-term high temperature resistance. special structure.

In addition, referring to Fig. 6 and Fig. 7, the utility model can further arrange the combustion section 41 and the heat storage section 42 horizontally. In this way, the heat storage chamber 421 is set horizontally, and the heat storage body 422 is placed directly On the wall body at the bottom of the heat storage chamber 421 , there is no need to arrange the heat storage body bracket 424 , which can simplify the structure of the heat storage chamber 421 .

In this embodiment, a straight smoke outlet 23 is provided on the furnace body 2, and the straight smoke outlet 23 is used to prevent pressure fluctuations during the reversing process of the flue gas. A small straight smoke outlet can be provided in the furnace body 2. When When the furnace pressure in the furnace body 2 fluctuates too much, part of the flue gas can be directly discharged outside to ensure that the air pressure in the furnace is basically balanced. Under normal circumstances, only thermal insulation is required during the casting period of production and the waiting period of the non-production stage. In order to save energy to the greatest extent, the main gas nozzle 413 and heat storage section 42 can be closed, and only the permanent flame device 412 can be turned on. The exhaust smoke also needs to be discharged outside by the straight exhaust port 23 of body of heater 2.

The above are only preferred implementations of the utility model, and the scope of protection of the utility model is not limited to the above-mentioned embodiments, and all technical solutions under the thinking of the utility model all belong to the scope of protection of the utility model. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims (6)

1. heat-storage lead-melting furnace, comprise a pot body (1), body of heater (2) and two heat-accumulation combustion assemblies, described pot body (1) is positioned on the body of heater (2), be separated into independently two heating cavities (21) by partition wall (3) in the described body of heater (2), it is characterized in that: described each heating cavity (21) is connected with a heat-accumulation combustion assembly by the flue (22) that offers on the body of heater (2), described heat-accumulation combustion assembly is installed in the outside of body of heater (2), described heat-accumulation combustion assembly comprises and is used for producing heating with the burning zone (41) of high-temperature gas and be used for providing for burning zone (41) heat accumulating sections (42) of high temperature air that described burning zone (41) passes through flue (22) and is communicated with heating cavity (21).

2. heat-storage lead-melting furnace according to claim 1, it is characterized in that: described heat accumulating sections (42) be positioned at burning zone (41) above or below, described heat accumulating sections (42) comprises regenerator (421), heat storage (422) and be installed in admission line (423) on the regenerator (421), described heat storage (422) is installed in the regenerator (421), be equiped with on the described admission line (423) be used for controlling admission line (423) and outside air conducting or with the switching device shifter of body of heater (2) conducting, described heat storage (422) is supported in the regenerator (421) by heat storage carriage (424).

3. heat-storage lead-melting furnace according to claim 1, it is characterized in that: horizontal layout between described burning zone (41) and the heat accumulating sections (42), described heat accumulating sections (42) comprises regenerator (421), heat storage (422) and is installed in admission line (423) on the regenerator (421), described heat storage (422) is installed in the regenerator (421), be equiped with on the described admission line (423) be used for controlling admission line (423) and outside air conducting or with the switching device shifter of body of heater (2) conducting.

4. according to claim 1 or 2 or 3 described heat-storage lead-melting furnaces, it is characterized in that: described burning zone (41) comprises combustion chamber (411) and is installed in ever-burning flame device (412) and main gas port (413) on the combustion chamber (411).

5. according to claim 1 or 2 or 3 described heat-storage lead-melting furnaces, it is characterized in that: offer in line mouth (23) on the described body of heater (2).

6. according to claim 2 or 3 described heat-storage lead-melting furnaces, it is characterized in that: described heat storage (422) adopts cellular heat storage.

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