CN115111931A - A kind of absorber and endothermic control method for alumina waste heat - Google Patents

Abstract

The invention provides an absorber for alumina waste heat and a heat absorption and discharge control method, wherein a stepped heat storage main body is arranged on the absorber, a contact heat collection end which is in contact with a target heat source and consists of a plurality of tubular heat conductors extends into the stepped heat storage main body, a frequency modulation induced draft fan is connected with the other end of the stepped heat storage main body, a plurality of heat storage pipes filled with five sections of heat storage materials with different phase-temperature temperatures are arranged in the stepped heat storage main body, and temperature detectors are respectively arranged on the heat storage pipes of a certain heat storage material with different phase-temperature temperatures, the contact heat collection end and the inlet of the frequency modulation induced draft fan. This absorber utilizes the heat absorption flow with the heat absorption of the back aluminium oxide ingot of coming out of the stove to the notch cuttype heat-retaining main part through the temperature that different temperature detectors detected, releases the heat of notch cuttype heat-retaining main part storage again and recycles in the heat exchanger, has reduced the waste of heat energy, has practiced thrift the energy, has also ensured that operating personnel can the safety in production to reduce the emergence of accident.

Description

A kind of absorber and endothermic control method for alumina waste heat

technical field

The present invention relates to an absorber, in particular to an absorber for alumina waste heat, and also to a method for controlling the heat absorption and release of the absorber.

Background technique

In the alumina smelting process, the alumina ingot needs to be cooled before proceeding to the next step. The natural cooling of alumina ingots after being released from the furnace is slow to dissipate heat. The cooling process greatly affects the production efficiency of the enterprise. The cooling of alumina ingots also causes a great waste of energy, and the high-temperature alumina ingots also have a serious impact on the production safety of operators.

SUMMARY OF THE INVENTION

Aiming at the situation of heat loss after the existing alumina ingots are released, the technical problem to be solved by the present invention is to provide an absorber capable of absorbing the heat released by the alumina ingots after being released.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: an absorber for alumina waste heat, comprising a fixing frame, a stepped heat storage body is arranged on the fixing frame, and one end of the stepped heat storage body is arranged on the fixing frame. A plurality of contact heat collecting ends consisting of tubular heat conductors extending into the stepped heat storage body are connected, and the other end of the contact heat collecting end is in contact with the target heat source; the other end of the stepped heat storage body is connected by pipes. A frequency-modulated induced draft fan is installed; a plurality of heat storage pipes filled with heat-storage materials are arranged in the stepped heat storage body along the direction from the contact heat collecting end to the frequency-modulated induced draft fan. , the phase transition temperature of the heat storage material is filled in the heat storage pipe from the contact heat collecting end to the frequency modulation induced draft fan end in the order from high to low; a first temperature detector is connected on the contact heat collecting end, and the first temperature detector is connected to the contact heat collecting end. A second temperature detector, a third temperature detector, a fourth temperature detector, a second temperature detector, a third temperature detector, a fourth temperature detector, The fifth temperature detector and the sixth temperature detector, the seventh temperature detector is arranged on the pipeline between the stepped heat storage main body and the frequency modulation induced draft fan; the electronic control device on the fixed frame is connected with each temperature detector and the frequency modulation induced draft fan. Control connection.

The stepped heat storage body is a tank body, a plurality of heat storage pipes are arranged in the tank body along the direction from the contact heat collecting end to the frequency modulation induced draft fan, and an insulating layer is arranged on the outer layer of the tank body.

Fire dampers are respectively provided on the connecting end of the stepped heat storage body and the contact heat collecting end, and on the pipeline between the stepped heat storage body and the frequency modulation induced draft fan, and the electric control device is controlled and connected to the control valve.

The heat absorption and heat release control method of the absorber of the present invention is:

A. Endothermic process

Step 1. After the integrated device is installed in place, the contact heat collecting end is in contact with the alumina, the fire dampers at both ends of the stepped heat storage body are opened, and the frequency modulation induced draft fan is turned on at the same time, and the frequency modulation induced draft fan runs at the lowest frequency;

Step 2. When the value of the first temperature detector is above 600℃, the fan frequency of the FM induced draft fan is increased according to the frequency of 5HZ per minute, until the temperature of the seventh temperature detector is 80-100℃;

Step 3. When the value of the first temperature detector reaches 500-600 ℃, check whether the temperature of the second temperature detector reaches 500 ℃ or more, when the temperature reaches 500 ℃ or more, then detect the third temperature detector, Whether the fourth temperature detector, the fifth temperature detector, and the sixth temperature detector have reached the corresponding temperature of 400°C, 300°C, 200°C, or 100°C, and if so, it is determined that the heat storage is completed; If it is not reached, use 30% frequency to run the FM induced draft fan to meet the requirements in all sections;

Step 4. When the value of the first temperature detector reaches 400-500 ℃, check whether the temperature of the third temperature detector reaches 400 ℃ or more, when the temperature reaches 400 ℃ or more, then detect the fourth temperature detector, the third temperature detector Whether the fifth temperature detector and the sixth temperature detector reach the corresponding 300°C, 200°C, and 100°C or higher, if they are reached, it is determined that half of the heat storage is completed; The frequency modulation induced draft fan to the fourth temperature detector, the fifth temperature detector, and the sixth temperature detector detection section meet the requirements; when the third temperature detector, the fourth temperature detector, the fifth temperature detector, and the sixth temperature detector After all the detection sections meet the requirements, check whether the temperature of the second temperature detector is above 500°C, if not, prompt to replace the alumina block for absorption until the energy storage reaches the standard;

Step 5. When the value of the first temperature detector reaches 300-400 ℃, check whether the temperature of the fourth temperature detector reaches 300 ℃ or more, when the temperature reaches 300 ℃ or more, then detect the fifth temperature detector, the first temperature detector Whether the six temperature detectors reach the corresponding 200°C or above 100°C, if it is reached, it will be judged that half of the heat storage is completed; if it is not reached, use 30% frequency to run the frequency-modulated induced draft fan to the fifth temperature detector , The sixth temperature detector detection section meets the requirements; when the fourth temperature detector, the fifth temperature detector, and the sixth temperature detector detection section all meet the requirements, examine the temperature of the second temperature detector and the third temperature detector. Whether it reaches 500°C or above 400°C, if not, it is prompted to replace the alumina block for absorption until the energy storage reaches the standard;

Step 6. When the value of the first temperature detector reaches 200-300 ℃, check whether the temperature of the fifth temperature detector reaches 200 ℃ or more, when the temperature reaches 200 ℃ or more, then check whether the sixth temperature detector reaches 200 ℃. The corresponding 100°C or higher, if it is reached, it will be judged that half of the heat storage is completed; if there is a situation that is not reached, use 30% frequency to run the frequency-modulated induced draft fan to the sixth temperature detector detection section to meet the requirements; when the fifth temperature After the detection section of the detector and the sixth temperature detector all meet the requirements, check whether the temperature of the second temperature detector, the third temperature detector and the fourth temperature detector has reached 500°C, 400°C and 300°C. , prompting to replace the new alumina block for absorption until the energy storage reaches the standard;

Step 7. When the value of the first temperature detector reaches 100-200℃, it will prompt to replace the alumina block;

B. Exothermic Process

Step 1. The stepped heat storage body should be installed vertically and upside down, the outlet of the FM induced draft fan should be connected to the heat exchanger, and the fire damper valve at the contact heat collecting end should be controlled to open 30%; The water in the container exchanges heat;

Step 2. Detect whether the water in the heat exchanger reaches the required water temperature or steam temperature, and when it reaches it, keep the valve opening; when it exceeds, reduce the frequency of the frequency modulation induced draft fan to reach the required water temperature or steam temperature; Increase the frequency of the frequency-modulated induced draft fan to achieve the required water temperature or steam temperature.

The present invention adopts an absorber and an endothermic control method for alumina waste heat designed by the above technical scheme, which can absorb the heat released by the alumina ingot after being released from the furnace, and use the absorbed heat for other purposes, so that the The heat released by the alumina ingot is utilized, which reduces the waste of energy and saves energy. By absorbing the heat released by the alumina ingots after being released, the serious impact of the high-temperature alumina ingots on the production safety of the operators is avoided, and the operators can produce safely and reduce the occurrence of accidents. The invention has simple structure, simple heat absorption and heat release methods, and realizes better utilization of the heat released by the alumina ingot after being released from the furnace.

Description of drawings

Fig. 1 shows the structure schematic diagram of the absorber of the present invention;

FIG. 2 is a schematic diagram showing the internal structure of the stepped heat storage body of the present invention;

FIG. 3 shows the distribution diagram of the temperature detectors provided on the stepped heat storage main body of the present invention.

Detailed ways

Below in conjunction with the accompanying drawings, an absorber for alumina waste heat and a method for controlling endothermic and exothermic heat of the present invention will be described in detail.

An absorber for alumina waste heat according to the present invention, referring to Fig. 1 to Fig. 3, includes a fixing frame on which a stepped heat storage body 3 is arranged, and one end of the stepped heat storage body 3 is connected with a contact heat collector End 1, the contact heat collecting end 1 is composed of a plurality of tubular heat conductors extending into the stepped heat storage body 3, and the other end of the contact heat collecting end 1 is connected to the target heat source (high temperature alumina ingot after being released) touch. A frequency-modulated induced draft fan 5 is connected to the other end of the stepped heat storage body 3 through a pipeline. A fire damper 2 is provided at the connecting end of the stepped heat storage body 3 and the contact heat collecting end 1 , and a fire damper 4 is also provided on the pipeline between the stepped heat storage body 3 and the frequency modulation induced draft fan 5 . The valves 4 are all controlled by electronic control devices arranged on the fixed frame.

The stepped heat storage body 3 of the present invention is a tank body, and a plurality of heat storage pipes 7 are arranged in the tank body. The heat storage material is composed of five stages of heat storage materials with different phase transition temperatures. The phase transition temperature of the heat storage material is from the contact heat collecting end 1 to the frequency modulation induced draft fan 5 in the order from high to low. The heat storage pipe 7 Fill inside. When the alumina ingot is cooled, it is conservatively estimated that its temperature is above 800°C, so the stepped section of the stepped heat storage body 3 is designed to be 5 sections, which can better exchange and store heat. A first temperature detector 8 is connected to the contact heat collecting end 1, and the first temperature detector 8 is used to detect the temperature in the contact heat collecting end 1, that is, to detect the temperature of the alumina ingot. A second temperature detector 9, a third temperature detector 10, a fourth temperature detector 11, a fifth temperature detector 12, a second temperature detector 9, a third temperature detector 10, a fourth temperature detector 11, a fifth temperature detector 12, The sixth temperature detector 13 , the second temperature detector 9 , the third temperature detector 10 , the fourth temperature detector 11 , the fifth temperature detector 12 , and the sixth temperature detector 13 respectively detect five sections in the heat storage pipe 7 The temperature of heat storage materials with different phase transition temperatures. A seventh temperature detector 14 is arranged on the pipeline between the stepped heat storage main body 3 and the FM induced draft fan 5. The seventh temperature detector 14 is used to detect the temperature of the inlet end of the FM induced draft fan 5, so as to ensure that the FM induced draft fan 5 is working. work within the temperature range. First temperature detector 8, second temperature detector 9, third temperature detector 10, fourth temperature detector 11, fifth temperature detector 12, sixth temperature detector 13, seventh temperature detector 14 and frequency modulation The induced draft fan 5 is controlled by an electronic control device. In the present invention, the outer layer of the tank body is also provided with a thermal insulation layer 6 for thermal insulation of the tank body.

The heat-absorbing process of the absorber of the present invention is:

Step 1. After the integrated device is installed in place, the contact heat collecting end 1 is in contact with the alumina ingot, the fire dampers 2 and 4 at both ends of the stepped heat storage body 3 are opened, and the frequency modulation induced draft fan 5 and the frequency modulation induced draft fan are turned on at the same time. 5 run at the lowest frequency;

Step 2. When the value of the first temperature detector 8 is above 600°C, the fan frequency of the FM induced draft fan 5 is increased according to the frequency of 5HZ per minute, until the temperature of the seventh temperature detector 14 is 80-100°C;

Step 3. When the value of the first temperature detector 8 reaches 500-600°C, check whether the temperature of the second temperature detector 9 reaches above 500°C, and when the temperature reaches above 500°C, then detect the third temperature detection Whether the temperature detector 10, the fourth temperature detector 11, the fifth temperature detector 12, and the sixth temperature detector 13 have reached the corresponding temperature of 400°C, 300°C, 200°C, or 100°C or not, and if so, it is determined that this time Heat storage is complete. If any of them are not met, use 30% frequency to run the FM induced draft fan 5 to meet the requirements in all sections;

Step 4. When the value of the first temperature detector 8 reaches 400-500°C, check whether the temperature of the third temperature detector 10 reaches above 400°C, and when the temperature reaches above 400°C, then detect the fourth temperature detector 11. Check whether the fifth temperature detector 12 and the sixth temperature detector 13 reach the corresponding temperature of 300°C, 200°C, or 100°C. If any of them are not reached, use 30% frequency to run the frequency modulation induced draft fan 5 to the fourth temperature detector 11, the fifth temperature detector 12, and the sixth temperature detector 13. The detection section meets the requirements; when the third temperature measurement detects After the detection sections of the detector 10, the fourth temperature detector 11, the fifth temperature detector 12, and the sixth temperature detector 13 all meet the requirements, check whether the temperature of the second temperature detector is above 500°C. , prompting to replace the new alumina block for absorption until the energy storage reaches the standard;

Step 5. When the value of the first temperature detector 8 reaches 300-400°C, check whether the temperature of the fourth temperature detector 11 reaches above 300°C, and when the temperature reaches above 300°C, then detect the fifth temperature detector 12. Whether the sixth temperature detector 13 reaches the corresponding temperature of 200°C and 100°C or higher, if it reaches the temperature, it is determined that half of the heat storage is completed. If any of them are not met, use 30% frequency to run the frequency-modulated induced draft fan 5 to the fifth temperature detector 12 and the sixth temperature detector 13 to detect the sections to meet the requirements. When the detection sections of the fourth temperature detector 11, the fifth temperature detector 12, and the sixth temperature detector 13 all meet the requirements, check whether the temperatures of the second temperature detector 9 and the third temperature detector 10 reach 500° C., 400° C. ℃ or above, if it is not reached, prompt to replace the alumina block for absorption until the energy storage reaches the standard;

Step 6. When the value of the first temperature detector 8 reaches 200-300°C, check whether the temperature of the fifth temperature detector 12 reaches above 200°C, and when the temperature reaches above 200°C, then detect the sixth temperature detector 13 Whether it reaches the corresponding 100°C or higher, if it is reached, it is determined that half of the heat storage is completed. If any of them are not met, run the frequency-modulated induced draft fan 5 to the sixth temperature detector 13 with a frequency of 30% to meet the requirements. When the detection sections of the fifth temperature detector 12 and the sixth temperature detector 13 all meet the requirements, check whether the temperature of the second temperature detector 9, the third temperature detector 10, and the fourth temperature detector 11 reaches 500° C., 400° C. ℃, above 300 ℃, if not reached, prompt to replace the new alumina block for absorption until the energy storage reaches the standard;

Step 7. When the value of the first temperature detector 8 reaches 100-200°C, it will prompt to replace the alumina block.

The heat release process of the absorber of the present invention is:

Step 1. The stepped heat storage body 3 should be installed vertically and upside down, the outlet of the FM induced draft fan should be connected to the heat exchanger, and the valve of fire damper 2 (high temperature end valve) should be controlled to open 30%. Turn on the frequency modulation induced draft fan 5 to guide the hot air into the heat exchanger (not shown in the figure) through the pipeline to exchange heat with the water in the heat exchanger;

Step 2. Detect whether the water in the heat exchanger reaches the required water temperature or steam temperature, and keep the valve opening when it is reached. When it exceeds, the frequency of the frequency-modulated induced draft fan 5 is reduced to achieve the desired water temperature or steam temperature. When not enough, the frequency of the frequency-modulated induced draft fan 5 is increased to achieve the required water temperature or steam temperature.

Claims (4)

1. An absorber for alumina waste heat comprises a fixed frame and is characterized in that a stepped heat storage main body is arranged on the fixed frame, one end of the stepped heat storage main body is connected with a plurality of contact heat collection ends which extend into the stepped heat storage main body and are composed of tubular heat conductors, and the other end of each contact heat collection end is in contact with a target heat source; the other end of the stepped heat storage main body is connected with a frequency modulation induced draft fan through a pipeline; a plurality of heat storage pipes filled with heat storage materials are arranged in the stepped heat storage main body along the direction from the contact heat collection end to the frequency modulation draught fan, the heat storage materials are composed of heat storage materials with different temperature changes in five sections, and the phase change temperature of the heat storage materials is sequentially filled in the heat storage pipes from the contact heat collection end to the frequency modulation draught fan end from high to low; a first temperature detector is connected to the contact heat collection end, a second temperature detector, a third temperature detector, a fourth temperature detector, a fifth temperature detector and a sixth temperature detector which are connected with heat storage materials with different temperature of five sections are sequentially arranged on the stepped heat storage main body from the contact heat collection end to the frequency modulation induced draft fan end, and a seventh temperature detector is arranged on a pipeline between the stepped heat storage main body and the frequency modulation induced draft fan; the electric control device on the fixing frame is in control connection with each temperature detector and the frequency modulation induced draft fan.

2. The absorber for the waste heat of alumina as claimed in claim 1, wherein the stepped heat storage body is a tank body, a plurality of heat storage pipes are arranged in the tank body along the direction from the contact heat collection end to the frequency-modulated induced draft fan, and the outer layer of the tank body is provided with a heat insulation layer.

3. The absorber for the waste heat of alumina as claimed in claim 1, wherein fire valves are respectively disposed on the connection end of the stepped heat storage main body and the contact heat collection end and the pipeline between the stepped heat storage main body and the frequency-modulated induced draft fan, and the electric control device is connected with the control valve.

4. A heat absorption and discharge control method for an absorber of alumina waste heat,

the method is characterized in that:

A. heat absorption process

Step 1, after the integrated device is installed in place, enabling the contact heat collection end to be in contact with alumina, opening fire valves at two ends of the stepped heat storage main body, and simultaneously starting a frequency modulation induced draft fan which runs at the lowest frequency;

step 2, when the value of the first temperature detector is above 600 ℃, increasing the frequency of a fan of a frequency modulation induced draft fan according to the frequency of 5HZ per minute until the temperature of the seventh temperature detector is 80-100 ℃;

step 3, when the value of the first temperature detector reaches 500-600 ℃, whether the temperature of the second temperature detector reaches more than 500 ℃ is examined, when the temperature reaches more than 500 ℃, whether the temperature of the third temperature detector, the fourth temperature detector, the fifth temperature detector and the sixth temperature detector reaches corresponding 400 ℃, 300 ℃, 200 ℃ and 100 ℃ is detected, and if the temperature reaches the corresponding 400 ℃, 300 ℃, 200 ℃ and 100 ℃, the heat storage is judged to be finished; if the frequency does not reach the preset frequency, operating the frequency-modulated induced draft fan by using 30 percent of frequency until all sections meet the requirements;

step 4, when the value of the first temperature detector reaches 400-500 ℃, whether the temperature of the third temperature detector reaches more than 400 ℃ is examined, when the temperature reaches more than 400 ℃, whether the temperature of the fourth temperature detector, the fifth temperature detector and the sixth temperature detector reaches corresponding 300 ℃, 200 ℃ and 100 ℃ is detected, and if the temperature reaches the corresponding 300 ℃, 200 ℃ and 100 ℃, half of the heat storage is judged to be completed; if the frequency does not reach the preset frequency, operating a frequency modulation induced draft fan to a fourth temperature detector, a fifth temperature detector and a sixth temperature detector by using 30 percent of frequency to meet the requirements; when the detection sections of the third temperature detector, the fourth temperature detector, the fifth temperature detector and the sixth temperature detector all meet the requirements, whether the temperature of the second temperature detector reaches more than 500 ℃ is examined, if not, a new alumina block is prompted to be replaced for absorption until the stored energy reaches the standard;

step 5, when the value of the first temperature detector reaches 300-400 ℃, whether the temperature of the fourth temperature detector reaches more than 300 ℃ is examined, when the temperature reaches more than 300 ℃, whether the fifth temperature detector and the sixth temperature detector reach more than 200 ℃ and 100 ℃ correspondingly is detected, and if yes, half of the heat storage is judged to be completed; if the frequency does not reach the preset frequency, operating a frequency modulation induced draft fan to a fifth temperature detector and a sixth temperature detector by using 30 percent of frequency to meet the requirements; when the detection sections of the fourth temperature detector, the fifth temperature detector and the sixth temperature detector all meet the requirements, whether the temperatures of the second temperature detector and the third temperature detector reach 500 ℃ and above 400 ℃ is examined, if the temperatures of the second temperature detector and the third temperature detector do not reach, a new alumina block is prompted to be replaced for absorption until the stored energy reaches the standard;

step 6, when the value of the first temperature detector reaches 200-300 ℃, whether the temperature of the fifth temperature detector reaches more than 200 ℃ is examined, when the temperature reaches more than 200 ℃, whether the temperature of the sixth temperature detector reaches more than 100 ℃ is detected, and if the temperature reaches more than 200 ℃, half of the heat storage is judged to be completed; if the frequency does not reach the preset frequency, operating a frequency modulation induced draft fan to a detection section of a sixth temperature detector by using the frequency of 30 percent to meet the requirement;

when the detection sections of the fifth temperature detector and the sixth temperature detector meet the requirements, whether the temperatures of the second temperature detector, the third temperature detector and the fourth temperature detector reach more than 500 ℃, 400 ℃ and 300 ℃ is examined, if the temperatures of the second temperature detector, the third temperature detector and the fourth temperature detector do not reach the requirements, the replacement of an alumina block is prompted for absorption until the stored energy reaches the standard;

step 7, when the value of the first temperature detector reaches 100-200 ℃, prompting to replace the alumina block;

B. exothermic process

Step 1, the stepped heat storage main body is vertically installed and inverted, the outlet of a frequency modulation induced draft fan is connected with a heat exchanger, and a fire damper valve at a contact heat collection end is opened by 30%; starting a frequency modulation induced draft fan to guide hot air to enter a heat exchanger to exchange heat with water in the heat exchanger;

step 2, detecting whether the water in the heat exchanger reaches the required water temperature or steam temperature, and keeping the opening degree of a valve when the water in the heat exchanger reaches the required water temperature or steam temperature; when the temperature exceeds the preset temperature, the frequency of the frequency-modulated induced draft fan is adjusted to be low so as to reach the required water temperature or steam temperature; and when the temperature of the water is not reached, the frequency of the frequency-modulated induced draft fan is modulated to be higher so as to reach the required water temperature or steam temperature.

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