Fire assaying soot blowing electric furnace with heat exchange function and uniform soot blowing function

Abstract

The utility model belongs to the technical field of fire assaying devices, and particularly relates to a fire assaying soot blowing electric furnace which has a heat exchange function and can uniformly blow soot. Wherein the cupel and the cupel tray are placed in the hearth, the flue gas pipeline is fixed on the side wall of the hearth and is communicated with a flue gas outlet on the side of the hearth, and the flue gas pipeline is communicated with a laboratory exhaust pipeline; the first heat exchange sleeve and the second heat exchange sleeve are jointly connected outside the flue gas pipeline in a sleeving manner; air inlets and heat exchange air inlet pipes are arranged at the upper ends and the lower ends of the first heat exchange sleeve and the second heat exchange sleeve respectively, the second heat exchange air inlet pipe penetrates into a hearth left side pipeline, and the first heat exchange air inlet pipe penetrates into a hearth right side pipeline. The multiple temperature monitoring and heating devices sequentially penetrate through the top of the hearth from front to back. The soot blowing device can solve the problems that low-temperature air is pumped in the soot blowing process, the temperature in the soot blowing electric furnace is not uniform, and the soot blowing ending time is not consistent.

Description

Technical Field

[0001] The utility model belongs to the technical field of fire assay devices, and in particular relates to a fire assay ash blowing electric furnace which has a heat exchange function and can evenly blow ash. Background Art

[0002] The fire assay analysis method is the main detection method for gold and silver analysis and trade arbitration in the gold industry at home and abroad. This method has the advantages of wide application range, large sampling volume, good representativeness, and accurate and reliable results. Among them, through smelting, the precious metals and base metals in the sample are captured in the lead buckle, and the simplest and most effective method to separate the precious metals from the base metals is ash blowing. The ash blowing process is to put the lead buckle into an ash dish at high temperature for oxidation blowing. The molten lead is oxidized by oxygen in the air into lead oxide and absorbed into the ash dish with a porous structure. The precious metal is not oxidized and remains in the ash dish to form an alloy particle. Therefore, the ash blowing step is an extremely important step, and the completion of the ash blowing step plays a decisive role in the test results.

[0003] During the ash blowing process, if low-temperature air enters, the ash blowing molten lead will be "frozen", preventing the ash blowing from continuing; in addition, most of the current ash blowing furnaces cannot guarantee uniform air intake, and basically adopt the open-door ash blowing method. The ash blowing near the ash blowing furnace door is done first, and the ash blowing inside the furnace is done later. This causes the ash blowing time of the samples inside the furnace and at the furnace door to be different, resulting in different sample recovery rates and inaccurate test results; and the open-door ash blowing will cause a part of the lead vapor to diffuse into the air, which not only pollutes the environment, but also causes certain harm to the human body; finally, the interior of the fire assay automated ash blowing electric furnace is relatively long, and the single-channel heating method controlled by only one thermocouple will cause the temperature difference between the furnace door and the interior to be more than 100°C, which will cause the innermost temperature inside the furnace to be too high, and the ash blowing loss is too large, while the ash blowing temperature at the furnace door is low, the ash blowing is not good, and even the ash blowing is "frozen"; especially the ash blowing for silver measurement is easily disturbed, and the loss will increase if the ash blowing time is extended. In summary, the field urgently needs to study solutions to these problems. Summary of the invention

[0004] The utility model provides a fire-testing ash-blowing electric furnace with a heat exchange function and capable of evenly blowing ash, so as to solve the problems of low-temperature air being pumped into the ash-blowing process, uneven temperature inside the ash-blowing electric furnace, and inconsistent ash-blowing end time.

[0005] A fire-testing ash-blowing electric furnace with heat exchange function and uniform ash-blowing, comprising a furnace body 1, a flue gas duct 3, a first heat exchange sleeve 6, a second heat exchange sleeve 7, an ash dish and an ash dish tray 14, and a temperature monitoring and heating device, wherein the furnace body 1 comprises an outer shell and a furnace 16 arranged in the outer shell, wherein an opening is arranged on the outer shell, the opening is communicated with the furnace 16, and a furnace door 2 is arranged at the opening, the ash dish and the ash dish tray 14 are placed in the furnace 16, the flue gas duct 3 is fixed on the rear side wall of the furnace 16 between the outer shell of the furnace body 1 and the furnace 16, and is communicated with a flue gas outlet 13 arranged in the side wall of the furnace 16, the flue gas outlet 13 is communicated with the inside of the furnace 16, and at the same time, the top of the flue gas duct 3 passes through the top cover of the outer shell of the furnace body 1 and is communicated with the exhaust duct in the laboratory;

[0006] The first heat exchange sleeve 6 and the second heat exchange sleeve 7 are jointly sleeved and fixed on the outside of the flue gas duct 3; the first heat exchange sleeve 6 is provided with a second air inlet 5 and a first heat exchange air inlet pipe 8 connected to its interior at the upper and lower ends, and the second heat exchange sleeve 7 is provided with a first air inlet 4 and a second heat exchange air inlet pipe 9 connected to its interior at the upper and lower ends; the left and right side walls of the furnace 16 are respectively provided with pipes and a plurality of furnace air inlets 10 connected thereto, the second heat exchange air inlet pipe 9 penetrates into the pipe on the left side wall of the furnace 16 and is connected to the pipe, and the first heat exchange air inlet pipe 8 penetrates into the pipe on the right side wall of the furnace 16 and is connected to the pipe; the multiple groups of temperature monitoring and heating devices pass through the top of the furnace 16 in sequence from front to back and penetrate into the furnace 16.

[0007] The temperature monitoring and heating device includes two U-shaped silicon carbon rods 11 arranged in sequence from left to right and a thermocouple 12 located in the middle thereof, wherein the U-shaped silicon carbon rods 11 and the thermocouple 12 respectively pass through the top of the furnace 16 and penetrate into the furnace 16 .

[0008] A pipe is provided in the left side wall of the furnace 16, and a plurality of furnace air inlets 10 connected to the pipe are provided in the left side wall of the furnace 16 below the pipe. A pipe is provided in the right side wall of the furnace 16, and a plurality of furnace air inlets 10 connected to the pipe are provided in the right side wall of the furnace 16 below the pipe.

[0009] The furnace door 2 is provided with an observation window 15 .

[0010] The top of the shell of the furnace body 1 is provided with a wire through hole for the wires of the U-shaped silicon carbon rod 11 to extend out of the external power supply. The wire through hole is also used to extend the wire connected to the thermocouple 12 to an external reading instrument, and a pipeline through hole for the pipelines connected to the second air inlet 5 and the first air inlet 4 to extend out and communicate with the external air source.

[0011] Beneficial effects of the utility model:

[0012] First, the heat exchange sleeve can exchange heat with the flue gas duct to recover the heat generated by the exhaust gas, so that the cool air blown in by the blower enters the furnace after being heated by the heat exchange device, preventing the molten lead from freezing due to cold during ash blowing, which affects the ash blowing process; at the same time, the heat energy emitted by the flue gas duct is reused to heat the air required for ash blowing, which is very energy-saving and environmentally friendly;

[0013] Second, the air is evenly introduced into the furnace through the air inlets on both sides of the furnace to ensure the consistency of the ash blowing progress of the whole furnace sample, reduce the ash blowing loss, and improve the recovery rate. In addition, when the air enters the furnace from the air inlet in the furnace, it passes through the silicon carbon rod, which will perform secondary heating on the air, which is more conducive to the ash blowing.

[0014] Third, the multi-channel heating mode solves the problems of low furnace door temperature, uneven furnace temperature and inconsistent ash blowing loss in the original integral heating ash blowing electric furnace;

[0015] Fourthly, the utility model adopts a closed ash blowing to ensure uniform temperature in the furnace. The lead vapor generated by the ash blowing will enter a special filtering system through a flue gas duct and will be discharged into the air after meeting the standards, which not only protects the environment but also reduces the harm of toxic smoke to the health of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying creative work.

[0017] Figure 1 It is the overall structure diagram of the utility model;

[0018] Figure 2 It is a back structural diagram of the utility model;

[0019] Figure 3 It is a perspective view of the utility model;

[0020] Figure 4 It is a longitudinal sectional view of the utility model. DETAILED DESCRIPTION

[0021] Example 1

[0022] like Figure 1-4As shown, a fire-testing ash-blowing electric furnace with heat exchange function and uniform ash-blowing includes a furnace body 1, a flue gas duct 3, a first heat exchange sleeve 6, a second heat exchange sleeve 7, an ash dish and an ash dish tray 14, and a temperature monitoring and heating device. The furnace body 1 includes an outer shell and a furnace 16 arranged in the outer shell (the front side wall, the left side wall, the right side wall and the bottom of the furnace 16 are respectively in contact with the front side, the left and right inner walls and the bottom of the upper half of the outer shell, the top of the furnace 16 is not in contact with the inner wall of the top of the outer shell, and a space is reserved for placing a U-shaped silicon carbon rod 11 and a thermocouple 12. The rear side wall of the furnace 16 is not in contact with the rear inner wall of the outer shell, and the space is used to place the flue gas duct duct 3, first heat exchange sleeve 6, second heat exchange sleeve 7, second air inlet 5, first air inlet 4, second heat exchange air inlet pipe 9 and first heat exchange air inlet pipe 8), wherein an opening is provided on the shell, the opening is communicated with the furnace 16, and a furnace door 2 is provided at the opening, an ash dish and an ash dish tray 14 are placed in the furnace 16 through the opening on the shell, a smoke duct 3 is fixed on the rear side wall of the furnace 16 between the shell of the furnace body 1 and the furnace 16, and is communicated with a smoke outlet 13 provided in the side wall of the furnace 16, the smoke outlet 13 is communicated with the inside of the furnace 16, and at the same time, the top of the smoke duct 3 passes through the top cover of the shell of the furnace body 1 and is communicated with the exhaust duct in the laboratory;

[0023] The first heat exchange sleeve 6 and the second heat exchange sleeve 7 are jointly sleeved and fixed on the outside of the flue gas duct 3 to wrap the flue gas duct 3; the first heat exchange sleeve 6 is provided with a second air inlet 5 and a first heat exchange air inlet pipe 8 communicating with the interior thereof at the upper and lower ends, and the second heat exchange sleeve 7 is provided with a first air inlet 4 and a second heat exchange air inlet pipe 9 communicating with the interior thereof at the upper and lower ends (the first heat exchange sleeve 6, the second heat exchange sleeve 7, the second air inlet 5, the first air inlet 4, the second heat exchange air inlet pipe 9 and the first heat exchange air inlet pipe 8 are all located between the outer shell of the furnace body 1 and the furnace 16); the left and right side walls of the furnace 16 are respectively provided with pipes and a plurality of furnace air inlets 10 communicating with the pipes, the second heat exchange air inlet pipe 9 penetrates into the pipe on the left side wall of the furnace 16 and communicates with the pipe, the first heat exchange air inlet pipe 8 penetrates into the pipe on the right side wall of the furnace 16 and communicates with the pipe; the plurality of groups of temperature monitoring and heating devices pass through the top of the furnace 16 in sequence from front to back and penetrate into the furnace 16.

[0024] The temperature monitoring and heating device includes two U-shaped silicon carbon rods 11 and a thermocouple 12 located in the middle thereof, which are arranged in sequence from left to right. The U-shaped silicon carbon rods 11 and the thermocouple 12 respectively pass through the top of the furnace 16 and penetrate into the furnace 16, and are fixed at the top of the furnace 16.

[0025] The portions of the U-shaped silicon carbon rods 11 on the left and right sides that penetrate into the furnace 16 are respectively located on both sides of the ash dish and the ash dish tray 14 .

[0026] The U-shaped silicon carbon rods 11 and the thermocouples 12 are divided into three groups: front, middle and rear. Every two U-shaped silicon carbon rods 11 and one thermocouple 12 form one group.

[0027] A pipe is provided in the left side wall of the furnace 16, and a plurality of furnace air inlets 10 connected to the pipe are provided in the left side wall of the furnace 16 below the pipe. A pipe is provided in the right side wall of the furnace 16, and a plurality of furnace air inlets 10 connected to the pipe are provided in the right side wall of the furnace 16 below the pipe.

[0028] The furnace door 2 is provided with an observation window 15 .

[0029] The shell of the furnace body 1 is divided into two parts, the lower part is a storage cabinet, the upper part is provided with a furnace 16, and universal wheels are provided at the four corners of the bottom of the shell.

[0030] The top of the shell of the furnace body 1 is provided with a wire through hole for the wires of the U-shaped silicon carbon rod 11 to extend out of the external power supply. The wire through hole is also used to extend the wire connected to the thermocouple 12 to an external reading instrument, and a pipeline through hole for the pipelines connected to the second air inlet 5 and the first air inlet 4 to extend out and communicate with the external air source.

[0031] The first heat exchange sleeve 6 and the second heat exchange sleeve 7 are hollow and are tightly installed on the outside of the flue gas duct 3. The first heat exchange sleeve 6 and the second heat exchange sleeve 7 are independent of each other and are not connected to each other.

[0032] The working process of this utility model:

[0033] During operation, the wires of the U-shaped silicon carbon rod 11 are extended through the wire through hole at the top of the furnace body 1 shell to be connected to an external power source, the thermocouple 12 is connected to an external reading instrument through a wire, the second air inlet 5 and the first air inlet 4 are connected to pipelines respectively, and the pipelines are extended through the pipeline through hole at the top of the furnace body 1 shell to be connected to a blower arranged outside;

[0034] Place the ash dish and ash dish tray 14 inside the furnace 16 in the furnace body 1, turn on the U-shaped silicon carbon rod 11 to heat the furnace 16, monitor the temperature in the furnace 16 through the thermocouple 12, and preheat for 20 minutes under the condition of heating to 940℃ (no additional air is required when preheating the ash dish and stripping the lead buckle, so the air intake is stopped during this process), take out the ash dish and ash dish tray 14, put the lead buckle into the ash dish of the ash dish and ash dish tray 14, and then put the ash dish and ash dish tray 14 with the lead buckle into the furnace 16 of the furnace body 1, keep warm for 5 minutes, observe the internal situation of the furnace body 1 through the observation window 15, and start air intake after the lead buckle is stripped, that is, turn on the external blower, and pass air into the first heat exchange sleeve 6 and the second heat exchange sleeve 7 through the first air inlet 4 and the second air inlet 5 respectively. During the heating of the furnace body 1, the furnace The hot air in 16 enters the flue gas duct 3 through the flue gas outlet 13, so the first heat exchange sleeve 6 and the second heat exchange sleeve 7 are both in a high temperature state, so the air entering them has been heated from this time, and then the heated air is passed into the air inlet 10 in the furnace through the first heat exchange air inlet pipe 8 and the second heat exchange air inlet pipe 9, and the hot air is evenly blown into the furnace 16 in the furnace body 1, and the ash blowing begins. During the whole heating process, the temperature at different positions in the furnace 16 is monitored by the thermocouple 12. As long as it is found that the temperature detected by any thermocouple 12 is inconsistent with the predetermined temperature, the U-shaped silicon carbon rods 11 on both sides of the thermocouple 12 are turned on or stopped to heat, so that the temperatures monitored by each thermocouple 12 from the front to the back are consistent, and are also the same as the predetermined temperature value. At this time, the temperature is recommended to be 820°C. Since the air intake inside the furnace body 1 is uniform and the temperature is consistent, the ash blowing process is consistent, and the ash blowing will basically end at the same time.

[0035] The flue gas duct 3 also has the function of discharging the waste gas generated during the ash blowing process, and the heat generated by the waste gas discharged from the flue gas duct 3 can also be used for heat exchange through the first heat exchange sleeve 6 and the second heat exchange sleeve 7, so as to heat the cold air blown into the first heat exchange sleeve 6 and the second heat exchange sleeve 7, and the heated air enters the furnace 16 through the second heat exchange air inlet pipe 9, the first heat exchange air inlet pipe 8, and the furnace air inlet 10 on the left and right side walls of the furnace 16. The hot air is beneficial to the ash blowing process.

Claims

1. A fire-testing ash-blowing electric furnace with heat exchange function and uniform ash-blowing, characterized in that: The invention comprises a furnace body (1), a flue gas duct (3), a first heat exchange sleeve (6), a second heat exchange sleeve (7), an ash dish and an ash dish tray (14), and a temperature monitoring and heating device. The furnace body (1) comprises an outer shell and a furnace (16) arranged in the outer shell, wherein the outer shell is provided with an opening, and a furnace door (2) is provided at the opening. The ash dish and the ash dish tray (14) are placed in the furnace (16). The flue gas duct (3) is fixed on the rear side wall of the furnace (16) between the outer shell of the furnace body (1) and the furnace (16), and is connected to a flue gas outlet (13) arranged in the side wall of the furnace (16). The flue gas outlet (13) is connected to the inside of the furnace (16). At the same time, the top of the flue gas duct (3) passes through the top cover of the outer shell of the furnace body (1) and is connected to the exhaust duct in the laboratory. The first heat exchange sleeve (6) and the second heat exchange sleeve (7) are jointly sleeved and fixed on the outside of the flue gas duct (3); the first heat exchange sleeve (6) is provided with a second air inlet (5) and a first heat exchange air inlet pipe (8) communicating with the interior thereof at the upper and lower ends, respectively; the second heat exchange sleeve (7) is provided with a first air inlet (4) and a second heat exchange air inlet pipe (9) communicating with the interior thereof at the upper and lower ends; the left and right side walls of the furnace (16) are provided with pipes and a plurality of furnace air inlets (10) communicating with the pipes, respectively; the second heat exchange air inlet pipe (9) penetrates into the pipe on the left side wall of the furnace (16) and is communicated with the pipe, and the first heat exchange air inlet pipe (8) penetrates into the pipe on the right side wall of the furnace (16) and is communicated with the pipe; the plurality of groups of temperature monitoring and heating devices pass through the top of the furnace (16) in sequence from front to back and penetrate into the furnace (16).

2. The fire-testing ash-blowing electric furnace with heat exchange function and uniform ash-blowing according to claim 1 is characterized in that: The temperature monitoring and heating device comprises two U-shaped silicon carbon rods (11) arranged in sequence from left to right and a thermocouple (12) located in the middle thereof, wherein the U-shaped silicon carbon rods (11) and the thermocouple (12) respectively pass through the top of the furnace (16) and penetrate into the furnace (16).

3. The fire-testing ash-blowing electric furnace with heat exchange function and uniform ash-blowing according to claim 1 is characterized in that: A pipe is provided in the left wall of the furnace (16), and a plurality of furnace air inlets (10) are provided in the left wall of the furnace (16) below the pipe and are connected to the pipe. A pipe is provided in the right wall of the furnace (16), and a plurality of furnace air inlets (10) are provided in the right wall of the furnace (16) below the pipe and are connected to the pipe.

4. The fire-testing ash-blowing electric furnace with heat exchange function and uniform ash-blowing according to claim 1 is characterized in that: The furnace door (2) is provided with an observation window (15).

5. The fire-testing ash-blowing electric furnace with heat exchange function and uniform ash-blowing according to claim 1 is characterized in that: The top of the outer shell of the furnace body (1) is provided with a wire through hole for extending the wire of the U-shaped silicon carbon rod (11) to an external power source, and the wire through hole is also used to extend the wire connected to the thermocouple (12) to an external reading instrument, and a pipeline through hole for extending the pipeline connected to the second air inlet (5) and the first air inlet (4) to communicate with an external air source.

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