CN115900330A - Kiln multi-energy source self-adaptive combined heating method - Google Patents
Kiln multi-energy source self-adaptive combined heating method Download PDFInfo
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Abstract
The invention belongs to the technical field of kilns, and particularly provides a kiln multi-energy source self-adaptive combined heating method which comprises the following steps: setting priority levels of a gas heating mode and an electric heating mode according to a cost optimal scheme; setting parameters of a gas heating mode and an electric heating mode; heating the interior of the kiln according to the parameter values of the gas heating mode and the electric heating mode; detecting the temperature in the kiln, and adjusting the parameter values of the gas heating mode and/or the electric heating mode according to the temperature in the kiln and the priority level; and judging whether the priority level changes or not, and adjusting the parameter values of the gas heating mode and the electric heating mode when the priority level changes. The method can adopt an electric heating mode and a gas heating mode to carry out heating, can set the priority level of the heating mode, flexibly uses various energy sources, saves the firing cost, can stably and reliably regulate and cooperate the various energy sources, and improves the stability of the temperature in the kiln.
Description
Technical Field
The invention relates to the technical field of kilns, in particular to a kiln multi-energy source self-adaptive combined heating method.
Background
The kiln is used for firing ceramic, sculpture and other utensils. The kiln mainly adopts liquefied gas, coal gas or natural gas as fuel; the fuel is ignited by the burner to burn, so that the temperature inside the kiln is raised to a relatively high temperature, and the temperature is kept for a specified time to sufficiently heat the object until the object develops the required characteristics.
In recent years, due to energy shortage and energy price fluctuation, the use of which energy source to perform kiln heating will determine the firing cost. If the kiln can adopt various energy sources, enterprises can flexibly set the energy sources used by the kiln, the kiln is one of ideal solutions, but the kiln is still lacking at present. In addition, the stability of the temperature in the kiln has important influence on the firing effect of the ware; therefore, a kiln heating mode which can flexibly use various energy sources, save the firing cost and improve the stability of the temperature in the kiln needs to be designed.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a kiln multi-energy self-adaptive combined heating method; the method can adopt an electric heating mode and a gas heating mode to carry out heating, can set the priority level of the heating mode, flexibly uses various energy sources, saves the firing cost, can stably and reliably regulate and cooperate the various energy sources, and improves the stability of the temperature in the kiln.
In order to achieve the purpose, the invention is realized by the following technical scheme: a kiln multipotency source self-adaptive combined heating method adopts a gas heating mode and an electric heating mode to heat the interior of a kiln; the gas heating mode is realized by conveying gas to a burner, and the burner burns the gas to form high-temperature airflow and then inputs the high-temperature airflow into a kiln; the electric heating mode is realized by adopting an electric heating device to heat the interior of the kiln;
the method comprises the following steps:
s1, comparing the energy cost of the gas heating mode with the energy cost of the electric heating mode to obtain a cost optimal scheme, and setting the priority levels of the gas heating mode and the electric heating mode;
the parameters of the gas heating mode comprise gas flow, and the parameters of the electric heating mode comprise electric heating power; setting parameters of a gas heating mode and an electric heating mode according to the priority: setting an initial value for a parameter with one high priority in a gas heating mode and an electric heating mode, and setting a parameter with one low priority as a first low value (the first low value is more than or equal to the lower limit of a parameter adjusting range of the one low priority);
s2, heating the interior of the kiln according to the parameter values of the gas heating mode and the electric heating mode;
s3, detecting the temperature in the kiln, and judging the temperature in the kiln and the set temperature:
if the temperature in the kiln is not equal to the set temperature, preferentially adjusting the parameter value of one item with high priority; when the temperature in the kiln is not equal to the set temperature and the parameter value of the item with the high priority exceeds the parameter adjusting range of the item with the high priority, adjusting the parameter value of the item with the low priority; until the temperature in the kiln reaches the set temperature;
s4, comparing the energy cost of the gas heating mode and the energy cost of the electric heating mode in the current time period, and judging whether the priority levels of the gas heating mode and the electric heating mode are changed: if the change occurs, updating the priority levels of the gas heating mode and the electric heating mode; setting a second low value of the parameter value of the item with the low priority, wherein the second low value is not less than the lower limit of the parameter adjusting range of the item with the low priority; gradually reducing the parameter value of the item with low priority and gradually increasing the parameter value of the item with high priority so as to enable the temperature in the kiln to reach the set temperature and the parameter value of the item with low priority to reach a second low value, and then jumping to the step S2; if not, directly jumping to the step S2.
The method can adopt the matching of an electric heating mode and a gas heating mode for heating, can set the priority level of the heating mode, flexibly uses various energy sources, sets the priority level of the energy sources according to the cost comparison, and can save the firing cost.
In the step S3, if the temperature in the kiln is not equal to the set temperature, the parameter value of the item with high priority is preferentially adjusted, which means:
if the temperature in the kiln is higher than the set temperature, reducing the parameter value of the item with high priority;
if the temperature in the kiln is less than the set temperature and the parameter value of the item with high priority is within the parameter adjustment range of the item with high priority, the parameter value of the item with high priority is increased and the parameter value of the item with low priority is unchanged;
and if the temperature in the kiln is less than the set temperature and the parameter value of the item with high priority reaches the upper limit of the parameter adjusting range of the item with high priority, setting the parameter value of the item with high priority as the upper limit of the parameter adjusting range of the item with high priority and increasing the parameter value of the item with low priority.
For the variable quantity of the parameter value increasing or decreasing, the variable quantity of the latter time is less than or equal to the variable quantity of the former time.
Preferably, the step S4, if changed, includes the following steps:
s41, increasing the parameter value of the item with high priority and reducing the parameter value of the item with low priority;
s42, setting the working time of the kiln;
s43, detecting the temperature in the kiln, and judging the temperature in the kiln and the set temperature:
if the temperature in the kiln is higher than the set temperature and the parameter value of the item with low priority is higher than the second low value, reducing the parameter value of the item with low priority and keeping the parameter value of the item with high priority unchanged, and jumping to the step S42;
if the temperature in the kiln is higher than the set temperature and the parameter value of the item with low priority reaches a second low value, reducing the parameter value of the item with high priority, keeping the parameter value of the item with low priority as the second low value, and jumping to the step S42;
if the temperature in the kiln is less than the set temperature and the parameter value of the item with high priority is within the parameter adjusting range of the item with high priority, increasing the parameter value of the item with high priority and keeping the parameter value of the item with low priority unchanged, and jumping to the step S42;
if the temperature in the kiln is less than the set temperature and the parameter value of the item with high priority exceeds the parameter adjustment range of the item with high priority, setting the parameter value of the item with high priority as the upper limit of the parameter adjustment range of the item with high priority, increasing the parameter value of the item with low priority, updating the second low value as the current parameter value of the item with low priority, and jumping to the step S42;
if the temperature in the kiln = the set temperature and the parameter value of the item with low priority is larger than the second low value, increasing the parameter value of the item with high priority, decreasing the parameter value of the item with low priority, and jumping to the step S42;
and if the temperature in the kiln = the set temperature and the parameter value of the low priority item reaches a second low value, jumping to the step S2.
Because different fuels have different heat values, the electric heating also has a temperature rise process, so that temperature fluctuation can be caused in the process of converting one heating mode into another heating mode; the invention adopts a gradual conversion mode, and combines the temperature condition in the kiln in the conversion process, thereby ensuring the temperature in the kiln to be stable in the conversion process.
Preferably, the electric heating devices are a plurality of electric heating rods with large middle parts and small two ends; the electric heating rods are respectively arranged above and below the kiln conveying roller rod, and the electric heating rods above the kiln conveying roller rod and the electric heating rods below the kiln conveying roller rod are arranged in a staggered mode.
If the positions of the electric heating rods above and below the conveying roller rod of the kiln are opposite, the temperature of the opposite position of the electric heating rod is higher, and the temperatures of the rest positions are lower, so that the temperature difference is obvious; according to the invention, the electric heating rods above and below the conveying roller rod of the kiln are arranged in a staggered manner, so that the phenomenon that the temperature is too high or too low at the same section can be avoided, and the material is heated more uniformly in the conveying direction; in addition, the electric heating rod is large in the middle and small in two ends, so that more heat can be supplemented to the middle part, and the temperature difference of the cross section is further reduced.
Preferably, in steps S3 and S43, detecting the temperature in the kiln includes: respectively detecting the temperature of an upper area and a lower area of a conveying roller rod of the kiln;
according to the temperature of the area above the kiln conveying roller rod, adjusting the electric heating power of an electric heating rod above the kiln conveying roller rod and/or adjusting the gas flow conveyed to a burner above the kiln conveying roller rod;
and adjusting the electric heating power of the electric heating rod below the conveying roller of the kiln and/or adjusting the gas flow delivered to the burner below the conveying roller of the kiln according to the temperature of the area below the conveying roller of the kiln.
The design can enable the temperature of each kiln body unit of the kiln to be adjusted more finely and accurately, and stable temperature field distribution can be obtained.
Preferably, in the step S43, when the gas flow is increased or decreased, the gas flow adjusting speed is less than or equal to 0.2 Nm/min for a single burner; when the electric heating power is increased or decreased, the speed of adjusting the electric heating power is less than or equal to 1kW/min for a single electric heating rod. The adjustment speed can further stabilize the temperature in the kiln.
Preferably, the kiln is divided into a plurality of kiln body units, two ends of each kiln body unit are respectively separated by a liftable fire damper, and the opening degree of the adjacent kiln body units is adjusted through the liftable fire dampers; the electric heating device and the burner are independently arranged in each kiln body unit; a smoke exhaust fan is connected with a kiln body unit positioned at the head end; the working frequency of the smoke exhaust fan is adjusted to adjust the smoke flow rate and the residence time among the kiln body units, so that the internal temperature of the kiln body units is adjusted.
The kiln is divided into a plurality of kiln body units, each kiln body unit is independently provided with an electric heating device and a burner, and the kiln has an independent heating function; be equipped with the fire door between the kiln body unit and separate to can adjust fire door aperture size, and adjust smoke exhaust fan's operating frequency, adjust the flue gas velocity of flow and the dwell time between the kiln body unit, thereby can stabilize the temperature field distribution in the kiln.
Preferably, a combustion fan is arranged to input combustion-supporting gas into the burner nozzle to be mixed with the gas so as to assist the gas to burn.
Preferably, when the gas flow is increased or decreased, the combustion-supporting gas flow is adjusted according to the gas flow; and calculating the flue gas flow, and adjusting the opening of the fire damper and the working frequency of the smoke exhaust fan according to the flue gas flow.
When the gas flow is increased, if the temperature in the kiln reaches a set temperature, the opening of the fire damper is increased, and the working frequency of the smoke exhaust fan is increased, so that the heat exchange time between the gas and the interior of the kiln is shortened; when the gas flow is reduced, the opening degree of the fire damper is reduced, and the working frequency of the smoke exhaust fan is reduced, so that the heat exchange time between the gas and the inside of the kiln is prolonged.
Preferably, a fuel gas storage device is arranged to provide fuel gas, and the input end of the fuel gas storage device is respectively connected with a hydrogen input pipeline for inputting hydrogen and a natural gas input pipeline for inputting natural gas; the gas provided by the gas storage device is pure natural gas or hydrogen-doped gas by adjusting the input flow of the hydrogen and the natural gas. The energy can be further flexibly used, and the firing cost is saved.
Preferably, the electric heating device is powered by a solar power supply or mains electricity. The solar power supply device and the commercial power are used for providing electric energy, so that the electric charge can be reduced on occasions and periods when solar energy is sufficient, and the burning cost is saved.
And S1, acquiring the available power amount, the electricity fee price and the gas price of the solar power supply device at the current time period, respectively estimating the cost price of the gas heating mode and the electric heating mode, and taking the mode with the lowest cost price as the optimal cost scheme.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the method can adopt an electric heating mode and a gas heating mode to carry out heating, can set the priority level of the heating mode, flexibly use various energy sources, set the priority level of the adopted energy sources according to cost comparison, intelligently select energy source/energy source combination, save firing cost and fully utilize valley electricity to relieve power shortage; when certain energy is in shortage, the energy structure can be adjusted to ensure production;
2. the method can stably and reliably regulate and cooperate various energy sources, and keep the stability of the temperature in the kiln in the process of energy source selection change, thereby ensuring the quality of products;
3. the method of the invention divides the kiln into a plurality of kiln body units for independent heating; fire doors are arranged among the kiln body units for separation, the opening degree of the fire doors can be adjusted, and the working frequency of the smoke exhaust fan is adjusted to adjust the smoke flow rate and the residence time among the kiln body units, so that the temperature field distribution in the kiln can be stabilized;
4. the method realizes that the fuel gas provided by the fuel gas storage device is pure natural gas or hydrogen-doped fuel gas by adjusting the input flow of the hydrogen and the natural gas, can further flexibly use energy sources, and saves the firing cost.
Drawings
FIG. 1 is a flow diagram of a multi-energy source adaptive combination heating method of a kiln of the present invention;
FIG. 2 is a schematic view of the kiln construction of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic view of the connection of the kiln body unit of the present invention with an electric heating device and a fuel gas storage device;
FIG. 5 is a schematic view of the kiln body unit of the present invention coupled to a combustion fan;
FIG. 6 is a schematic view of the connection of the kiln body unit and the smoke exhaust fan of the present invention;
the system comprises a kiln body unit 1, a fuel gas storage device 2, an electric heating device 3, a temperature sensing device 4, a burner 5, a hydrogen flow detection and adjustment device 6, a natural gas flow detection and adjustment device 7, a fuel gas branch pipe 8, a fuel gas flow detection and adjustment device 9, a combustion-supporting fan 10, a combustion-supporting branch pipe 11, a combustion-supporting gas flow detection and adjustment device 12, a smoke exhaust fan 13 and a fire damper 14.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Examples
The flow of the multi-energy self-adaptive combined heating method for the kiln is shown in figure 1.
The kiln multi-energy source self-adaptive combined heating method is realized by a kiln, and the structure of the kiln is shown in figures 2 to 6. The kiln comprises a fuel gas storage device 2, an electric heating device 3, a smoke exhaust fan 13, a combustion fan 10 and a plurality of kiln body units 1 which are connected in sequence. The input end of the fuel gas storage device 2 is respectively connected with a hydrogen input pipeline and a natural gas input pipeline so as to respectively input hydrogen and natural gas; a hydrogen flow detection and regulation device 6 is arranged on the hydrogen input pipeline; and a natural gas flow detection and adjustment device 7 is arranged on the natural gas input pipeline. The hydrogen flow rate detection adjustment means 6 preferably includes a hydrogen flow meter for detecting the hydrogen flow rate and a hydrogen solenoid valve for adjusting the hydrogen flow rate; the natural gas flow rate detection and adjustment device 7 preferably includes a natural gas flow meter for detecting the flow rate of natural gas and a natural gas solenoid valve for adjusting the flow rate of natural gas. The hydrogen flow detection and adjustment device 6 and the natural gas flow detection and adjustment device 7 can be used for respectively adjusting the input amount of hydrogen and natural gas, so that the proportion of hydrogen and natural gas of the fuel gas in the fuel gas storage device 2 is adjusted, and the fuel gas in the fuel gas storage device 2 is pure natural gas or hydrogen-doped fuel gas with different hydrogen contents.
Each kiln body unit 1 is provided with an in-kiln channel; the electric heating devices 3 are respectively arranged in the channels in each kiln; the electric heating device 3 is preferably a plurality of electric heating rods with large middle and small two ends; the electric heating rods are respectively arranged above and below the kiln conveying roller rod, and the electric heating rods above the kiln conveying roller rod and the electric heating rods below the kiln conveying roller rod are arranged in a staggered mode. Temperature sensing devices 4 for detecting temperature are also respectively arranged in the channels in each kiln; the temperature sensing devices 4 are respectively arranged at the top and the bottom of the channel in the kiln. The temperature of a plurality of important positions of passageway in this setting detectable kiln is favorable to realizing the temperature regulation to each position. The temperature sensing device 4 may be of a conventional type, such as a thermocouple.
If the positions of the electric heating rods above and below the conveying roller rod of the kiln are opposite, the temperature of the opposite position of the electric heating rod is higher, while the temperatures of the rest positions are lower, and the temperature difference is obvious; according to the invention, the electrical heating rods above and below the conveying roller rod of the kiln are arranged in a staggered manner, so that the over-high or over-low temperature at the same section can be avoided, and the material is heated more uniformly in the conveying direction; in addition, the electric heating rod is large in the middle and small at two ends, so that more heat can be supplemented to the middle part, and the temperature difference of the cross section is further reduced.
Each kiln body unit 1 is provided with a burner 5; the output end of the gas storage device 2 is respectively connected with the burner 5 of each kiln body unit 1 through a gas branch pipe 8; each gas branch pipe 8 is respectively provided with a gas flow detection and regulation device 9; the gas flow rate detection adjusting means 9 preferably includes a gas flow meter for detecting the gas flow rate and a gas solenoid valve for adjusting the gas flow rate. The burner 5 of each kiln body unit 1 is respectively connected with a combustion-supporting fan 10 through a combustion-supporting branch pipe 11; and a combustion-supporting gas flow detection and regulation device 12 is arranged on the combustion-supporting branch pipe 11. The combustion fan 10 can deliver combustion-supporting gas, such as air, to the burner 5 to make the gas burn sufficiently, and the flow rate of the combustion-supporting gas can be adjusted by the combustion-supporting gas flow rate detecting and adjusting device 12.
Two ends of the in-kiln channel of each kiln body unit 1 are respectively provided with a fire-blocking door 14; each fire-blocking door 14 is respectively connected with a fire-blocking lifting device so as to realize the lifting of the fire-blocking door 14 and further realize the opening adjustment of the adjacent kiln body units 1; the smoke exhaust fan 13 is connected with the kiln body unit 1 at the head end. The fire-stopping lifting device can adopt the existing structure, and only needs to realize the ascending or descending of the fire-stopping door.
The kiln multi-energy source self-adaptive combined heating method adopts a gas heating mode and an electric heating mode to heat the interior of the kiln; the gas heating mode is realized by conveying gas to a burner, and the burner burns the gas to form high-temperature airflow and then inputs the high-temperature airflow into a kiln; the electric heating mode is realized by adopting an electric heating device to heat the interior of the kiln;
the method comprises the following steps:
s1, comparing the energy cost of the gas heating mode with the energy cost of the electric heating mode to obtain a cost optimal scheme, and setting the priority levels of the gas heating mode and the electric heating mode;
the parameters of the gas heating mode comprise gas flow, and the parameters of the electric heating mode comprise electric heating power; setting parameters of a gas heating mode and an electric heating mode according to the priority level: setting an initial value for a parameter with one high priority in a gas heating mode and an electric heating mode, and setting a parameter with one low priority as a first low value (the first low value is more than or equal to the lower limit of a parameter adjusting range of the parameter with one low priority);
s2, heating the interior of the kiln according to the parameter values of the gas heating mode and the electric heating mode;
s3, detecting the temperature in the kiln, and judging the temperature in the kiln and the set temperature:
if the temperature in the kiln is not equal to the set temperature, preferentially adjusting the parameter value of one item with high priority; when the temperature in the kiln is not equal to the set temperature and the parameter value of the item with the high priority exceeds the parameter adjusting range of the item with the high priority, adjusting the parameter value of the item with the low priority; until the temperature in the kiln reaches the set temperature;
s4, comparing the energy cost of the gas heating mode and the energy cost of the electric heating mode in the current time period, and judging whether the priority levels of the gas heating mode and the electric heating mode are changed: if the change occurs, updating the priority levels of the gas heating mode and the electric heating mode; setting a second low value of the parameter value of the item with the low priority, wherein the second low value is not less than the lower limit of the parameter adjusting range of the item with the low priority; gradually reducing the parameter value of the item with low priority and gradually increasing the parameter value of the item with high priority so as to enable the temperature in the kiln to reach the set temperature and the parameter value of the item with low priority to reach a second low value, and then jumping to the step S2; if not, directly jumping to the step S2.
In the step S3, if the temperature in the kiln is not equal to the set temperature, the parameter value of the item with high priority is preferentially adjusted, which means:
if the temperature in the kiln is higher than the set temperature, reducing the parameter value of the item with high priority;
if the temperature in the kiln is less than the set temperature and the parameter value of the item with high priority is within the parameter adjustment range of the item with high priority, the parameter value of the item with high priority is increased and the parameter value of the item with low priority is unchanged;
and if the temperature in the kiln is less than the set temperature and the parameter value of the item with high priority reaches the upper limit of the parameter adjusting range of the item with high priority, setting the parameter value of the item with high priority as the upper limit of the parameter adjusting range of the item with high priority and increasing the parameter value of the item with low priority.
For the variable quantity of the parameter value increasing or decreasing, the variable quantity of the latter time is less than or equal to the variable quantity of the former time.
And S4, if the change occurs, the method comprises the following steps:
s41, increasing the parameter value of the item with high priority and reducing the parameter value of the item with low priority;
s42, setting the working time of the kiln;
s43, detecting the temperature in the kiln, and judging the temperature in the kiln and the set temperature:
if the temperature in the kiln is higher than the set temperature and the parameter value of the item with low priority is higher than the second low value, reducing the parameter value of the item with low priority and keeping the parameter value of the item with high priority unchanged, and jumping to the step S42;
if the temperature in the kiln is higher than the set temperature and the parameter value of the item with low priority reaches a second low value, reducing the parameter value of the item with high priority, keeping the parameter value of the item with low priority at the second low value, and jumping to the step S42;
if the temperature in the kiln is less than the set temperature and the parameter value of the item with high priority is within the parameter adjusting range of the item with high priority, increasing the parameter value of the item with high priority and keeping the parameter value of the item with low priority unchanged, and jumping to the step S42;
if the temperature in the kiln is less than the set temperature and the parameter value of the item with high priority exceeds the parameter adjustment range of the item with high priority, setting the parameter value of the item with high priority as the upper limit of the parameter adjustment range of the item with high priority, increasing the parameter value of the item with low priority, updating the second low value as the current parameter value of the item with low priority, and jumping to the step S42;
if the temperature in the kiln = the set temperature and the parameter value of the item with low priority is larger than the second low value, increasing the parameter value of the item with high priority, decreasing the parameter value of the item with low priority, and jumping to the step S42;
and if the temperature in the kiln = the set temperature and the parameter value of the low-priority item reaches a second low value, jumping to the step S2.
Because different fuels have different heat values, the electric heating also has a temperature rise process, so that temperature fluctuation can be caused in the process of converting one heating mode into another heating mode; the invention adopts a gradual conversion mode, combines the temperature condition in the kiln in the conversion process and can ensure the temperature in the kiln to be stable in the conversion process.
In the step S43, when the gas flow is increased or decreased, the gas flow adjusting speed is less than or equal to 0.2 Nm/min for a single burner; when the electric heating power is increased or decreased, the speed of adjusting the electric heating power is less than or equal to 1kW/min for a single electric heating rod.
In the steps S3 and S43, the step of detecting the temperature in the kiln comprises the following steps: respectively detecting the temperature of an upper area and a lower area of a conveying roller rod of the kiln;
according to the temperature of the area above the kiln conveying roller rod, adjusting the electric heating power of an electric heating rod above the kiln conveying roller rod and/or adjusting the gas flow conveyed to a burner above the kiln conveying roller rod;
and adjusting the electric heating power of the electric heating rod below the conveying roller of the kiln and/or adjusting the gas flow delivered to the burner below the conveying roller of the kiln according to the temperature of the area below the conveying roller of the kiln. The design can enable the temperature regulation of each kiln body unit of the kiln to be more refined and accurate, and stable temperature field distribution can be obtained.
Furthermore, the kiln is divided into a plurality of kiln body units, two ends of each kiln body unit are respectively separated by a liftable fire-stopping door, and the opening degree of the adjacent kiln body units is adjusted through the liftable fire-stopping doors; each kiln body unit is independently provided with an electric heating device and a burner for combusting gas to form high-temperature gas flow and inputting the high-temperature gas flow to realize independent heating; a smoke exhaust fan is connected with a kiln body unit positioned at the head end; the working frequency of the smoke exhaust fan is adjusted to adjust the smoke flow rate and the residence time among the kiln body units, so that the internal temperature of the kiln body units is adjusted.
And a combustion-supporting fan is arranged to input combustion-supporting gas into the burner nozzle to be mixed with the gas so as to assist the gas to burn. The flow of the combustion-supporting gas is adjusted by adjusting the frequency of the combustion-supporting fan and adjusting a combustion-supporting gas electromagnetic valve on a combustion-supporting gas conveying pipeline.
And when the gas flow is increased or decreased, adjusting the combustion-supporting gas flow and calculating the flue gas flow according to the gas flow. The method for calculating the smoke flow can adopt the prior art, for example, the calculation scheme disclosed in the gas combustion and application (third edition) published by the Chinese architecture industry publishing company.
And adjusting the opening size of the fire damper and the working frequency of the smoke exhaust fan according to the smoke flow. When the gas flow is increased, the flue gas flow is increased, if the temperature in the kiln reaches the set temperature, the opening degree of a fire damper is increased, and the working frequency of a smoke exhaust fan is increased, so that the heat exchange time between the flue gas and the inside of the kiln is shortened; when the gas flow is reduced, the opening degree of the fire damper is reduced, and the working frequency of the smoke exhaust fan is reduced, so that the heat exchange time between the gas and the inside of the kiln is prolonged. The regulation ratio of the flue gas flow and the fire blocking opening can be as follows: when the smoke flow is detected to be increased by less than 10% of a set value, the opening of the fire damper is increased by 5% -10%; when the detected smoke flow is increased to 10-30% of the set value, the opening of the fire damper is increased by 10-20%; when the smoke flow is detected to be increased to 30-50% of the set value, the opening degree of the fire damper is increased by 20-30%; when the detected smoke flow is increased to 50-70% of the set value, the opening of the fire damper is increased by 30-40%; when the smoke flow is detected to increase by more than 70% of the set value, the opening degree of the fire damper is maximized. The regulation relation between the flue gas flow and the working frequency of the smoke exhaust fan can be as follows: the smoke exhaust fan can adopt a single fan or double fans; when a single smoke exhaust fan is adopted, the working frequency range of the smoke exhaust fan is generally 25-48 Hz; when two smoke exhaust fans work in parallel, the working frequency range of the smoke exhaust fans is generally 18-35 Hz; when the flue gas flow is larger, the working frequency of the smoke exhaust fan is higher.
The kiln is divided into a plurality of kiln body units, each kiln body unit is independently provided with an electric heating device and a burner, and the kiln has an independent heating function; be equipped with the fire door between the kiln body unit and separate to can adjust the fire door aperture size, and adjust smoke exhaust fan's operating frequency, adjust the flue gas velocity of flow and the dwell time between the kiln body unit, thereby can stabilize the temperature field distribution in the kiln.
The method can adopt the matching of an electric heating mode and a gas heating mode for heating, can set the priority level of the heating mode, flexibly uses various energy sources, sets the priority level of the energy sources according to the cost comparison, and can save the firing cost.
And S1, acquiring the available power amount, the electricity fee price and the gas price of the solar power supply device at the current time period, respectively estimating the cost price of the gas heating mode and the electric heating mode, and taking the mode with the lowest cost price as the optimal cost scheme.
Arranging a fuel gas storage device to provide fuel gas, wherein the input end of the fuel gas storage device is respectively connected with a hydrogen input pipeline for inputting hydrogen and a natural gas input pipeline for inputting natural gas; the gas provided by the gas storage device is pure natural gas or hydrogen-doped gas by adjusting the input flow of the hydrogen and the natural gas. The energy can be further flexibly used, and the firing cost is saved.
The electric heating device is powered by a solar power supply device or commercial power. The solar power supply device and the commercial power are used for providing electric energy, so that the electric charge can be reduced on occasions and periods when solar energy is sufficient, and the burning cost is saved.
For example, the fired 800mm, 9mm polished tile weighed about 26 kg/m 3 The energy consumption of the natural gas heating mode is about 1.6Nm 3 / m 3 The energy consumption of the brick is about 1 kW.h/kg in an electric heating mode; therefore, firing 800mm 9mm polished tiles consumes energy costs:
energy consumption cost of a natural gas heating mode: 1.6Nm 3 / m 3 X gas value;
energy consumption cost of an electric heating mode: 1 kW. H/kg X26 kg/m 3 X electricity charge unit price;
the situation that the electricity rates are different due to the difference of electricity consumption peaks and valleys in different periods of time exists, the cost is lower by adopting an electric heating mode in the electricity consumption valley period, and the electric heating mode is used as much as possible in the period of time; in the peak period of electricity utilization, the cost is low by adopting a gas heating mode, and the gas heating mode is used as much as possible in the peak period; if the electric heating device can be powered by the solar power supply device, the cost of the electric heating mode can comprehensively consider the solar power supply condition and the commercial power supply condition.
The specific use and distribution of the electric heating mode and the gas heating mode can save cost, can fully utilize valley electricity to relieve power shortage, and can adjust the energy structure to ensure production when certain energy is in shortage.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A kiln multi-energy self-adaptive combined heating method is characterized in that: heating the interior of the kiln by adopting a gas heating mode and an electric heating mode; the gas heating mode is realized by conveying gas to a burner, and the burner burns the gas to form high-temperature gas flow and then inputs the high-temperature gas flow into a kiln; the electric heating mode is realized by adopting an electric heating device to heat the interior of the kiln;
the method comprises the following steps:
s1, comparing the energy cost of a gas heating mode with the energy cost of an electric heating mode to obtain a cost optimal scheme, so as to set priority levels of the gas heating mode and the electric heating mode;
the parameters of the gas heating mode comprise gas flow, and the parameters of the electric heating mode comprise electric heating power; setting parameters of a gas heating mode and an electric heating mode according to the priority: setting an initial value for a parameter with one high priority in a gas heating mode and an electric heating mode, and setting a parameter with one low priority as a first low value, wherein the first low value is more than or equal to the lower limit of a parameter adjusting range of the one low priority;
s2, heating the interior of the kiln according to the parameter values of the gas heating mode and the electric heating mode;
s3, detecting the temperature in the kiln, and judging the temperature in the kiln and the set temperature:
if the temperature in the kiln is not equal to the set temperature, preferentially adjusting the parameter value of one item with high priority; when the temperature in the kiln is not equal to the set temperature and the parameter value of the item with the high priority exceeds the parameter adjusting range of the item with the high priority, adjusting the parameter value of the item with the low priority; until the temperature in the kiln reaches the set temperature;
s4, comparing the energy cost of the gas heating mode and the energy cost of the electric heating mode in the current time period, and judging whether the priority levels of the gas heating mode and the electric heating mode are changed: if the change occurs, updating the priority levels of the gas heating mode and the electric heating mode; setting a second low value of the parameter value of the item with the low priority, wherein the second low value is not less than the lower limit of the parameter adjusting range of the item with the low priority; gradually reducing the parameter value of the item with low priority and gradually increasing the parameter value of the item with high priority so as to enable the temperature in the kiln to reach the set temperature and the parameter value of the item with low priority to reach a second low value, and then jumping to the step S2; if not, directly jumping to the step S2.
2. The kiln multipotential self-adaptive combined heating method according to claim 1, characterized in that: and S4, if the change occurs, the method comprises the following steps:
s41, increasing the parameter value of the item with high priority and reducing the parameter value of the item with low priority;
s42, setting the working time of the kiln;
s43, detecting the temperature in the kiln, and judging the temperature in the kiln and the set temperature:
if the temperature in the kiln is higher than the set temperature and the parameter value of the item with low priority is higher than the second low value, reducing the parameter value of the item with low priority and keeping the parameter value of the item with high priority unchanged, and jumping to the step S42;
if the temperature in the kiln is higher than the set temperature and the parameter value of the item with low priority reaches a second low value, reducing the parameter value of the item with high priority, keeping the parameter value of the item with low priority at the second low value, and jumping to the step S42;
if the temperature in the kiln is less than the set temperature and the parameter value of the item with high priority is in the parameter adjustment range of the item with high priority, increasing the parameter value of the item with high priority and keeping the parameter value of the item with low priority unchanged, and jumping to the step S42;
if the temperature in the kiln is less than the set temperature and the parameter value of the item with high priority exceeds the parameter adjustment range of the item with high priority, setting the parameter value of the item with high priority as the upper limit of the parameter adjustment range of the item with high priority, increasing the parameter value of the item with low priority, updating the second low value as the current parameter value of the item with low priority, and jumping to the step S42;
if the temperature in the kiln = the set temperature and the parameter value of the item with low priority is larger than the second low value, increasing the parameter value of the item with high priority, decreasing the parameter value of the item with low priority, and jumping to the step S42;
and if the temperature in the kiln = the set temperature and the parameter value of the low priority item reaches a second low value, jumping to the step S2.
3. The kiln multipotential self-adaptive combined heating method according to claim 2, characterized in that: the electric heating devices are a plurality of electric heating rods with large middle parts and small two ends; the electric heating rods are respectively arranged above and below the kiln conveying roller rod, and the electric heating rods above the kiln conveying roller rod and the electric heating rods below the kiln conveying roller rod are arranged in a staggered mode.
4. The kiln multipotential self-adaptive combined heating method according to claim 3, characterized in that: in the steps S3 and S43, the step of detecting the temperature in the kiln comprises the following steps: respectively detecting the temperature of an upper area and a lower area of a conveying roller rod of the kiln;
according to the temperature of the area above the kiln conveying roller rod, adjusting the electric heating power of an electric heating rod above the kiln conveying roller rod and/or adjusting the gas flow conveyed to a burner above the kiln conveying roller rod;
and adjusting the electric heating power of the electric heating rod below the conveying roller of the kiln and/or adjusting the gas flow delivered to the burner below the conveying roller of the kiln according to the temperature of the area below the conveying roller of the kiln.
5. The kiln multipotential self-adaptive combined heating method according to claim 3, characterized in that: in the step S43, when the gas flow is increased or decreased, the gas flow adjusting speed is less than or equal to 0.2 Nm/min for a single burner; when the electric heating power is increased or decreased, the speed of adjusting the electric heating power is less than or equal to 1kW/min for a single electric heating rod.
6. The kiln multipotential self-adaptive combined heating method according to claim 1, characterized in that: dividing the kiln into a plurality of kiln body units, wherein two ends of each kiln body unit are respectively separated by a liftable fire-blocking door, and the opening degree of the adjacent kiln body units is adjusted through the liftable fire-blocking doors; the electric heating device and the burner are independently arranged in each kiln body unit; a smoke exhaust fan is connected with a kiln body unit positioned at the head end; the working frequency of the smoke exhaust fan is adjusted to adjust the smoke flow rate and the residence time among the kiln body units, so that the internal temperature of the kiln body units is adjusted.
7. The kiln multipotential self-adaptive combined heating method according to claim 6, characterized in that: and a combustion-supporting fan is arranged to input combustion-supporting gas into the burner nozzle to be mixed with the gas so as to assist the gas to burn.
8. The kiln multipotential self-adaptive combined heating method according to claim 5, characterized in that: when the gas flow is increased or decreased, the combustion-supporting gas flow is adjusted and the flue gas flow is calculated according to the gas flow; and adjusting the opening of the fire damper and the working frequency of the smoke exhaust fan according to the smoke flow.
9. The kiln multipotential self-adaptive combined heating method according to claim 1, characterized in that: the method comprises the following steps that a fuel gas storage device is arranged to provide fuel gas, and the input end of the fuel gas storage device is respectively connected with a hydrogen input pipeline for inputting hydrogen and a natural gas input pipeline for inputting natural gas; the gas provided by the gas storage device is pure natural gas or hydrogen-doped gas by adjusting the input flow of the hydrogen and the natural gas.
10. The kiln multipotential self-adaptive combined heating method according to claim 1, characterized in that: the electric heating device is powered by a solar power supply device or commercial power;
and S1, acquiring the available power amount, the electricity fee price and the gas price of the solar power supply device in the current time period, respectively estimating the cost price of the gas heating mode and the electric heating mode, and taking the mode with the lowest cost price as the optimal cost scheme.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116499272A (en) * | 2023-06-19 | 2023-07-28 | 广东中鹏热能科技有限公司 | Intelligent kiln control method for tracking multi-energy combustion carbon emission |
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| DE4242086A1 (en) * | 1992-12-14 | 1994-06-16 | Haesler Andreas Ing Grad | Heating of ceramic firing kiln - by blowing IC engine exhaust gas through electrically heated burner jet tubes |
| CN206001898U (en) * | 2016-08-11 | 2017-03-08 | 江苏金色工业炉股份有限公司 | A kind of meshbeltfurnace heating system |
| CN208505015U (en) * | 2018-06-20 | 2019-02-15 | 安徽热通工业机械有限公司 | A kind of dual-energy heating function furnace |
| CN113340099A (en) * | 2021-06-19 | 2021-09-03 | 黄冈市华窑中洲窑炉有限公司 | Gas-electric hybrid heating roller kiln for producing lithium battery material |
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| DE4242086A1 (en) * | 1992-12-14 | 1994-06-16 | Haesler Andreas Ing Grad | Heating of ceramic firing kiln - by blowing IC engine exhaust gas through electrically heated burner jet tubes |
| CN206001898U (en) * | 2016-08-11 | 2017-03-08 | 江苏金色工业炉股份有限公司 | A kind of meshbeltfurnace heating system |
| CN208505015U (en) * | 2018-06-20 | 2019-02-15 | 安徽热通工业机械有限公司 | A kind of dual-energy heating function furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116499272A (en) * | 2023-06-19 | 2023-07-28 | 广东中鹏热能科技有限公司 | Intelligent kiln control method for tracking multi-energy combustion carbon emission |
| CN116499272B (en) * | 2023-06-19 | 2024-01-16 | 广东中鹏热能科技有限公司 | Intelligent kiln control method for tracking multi-energy combustion carbon emission |
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| CN115900330B (en) | 2023-05-16 |
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Address after: 528216 Block A-2, No.3 Xiangda Road, Danzao Town, Nanhai District, Foshan City, Guangdong Province Patentee after: Guangdong Zhongpeng Thermal Energy Technology Co.,Ltd. Patentee after: GUANGDONG CHAMPON NEW ENERGY TECHNOLOGY Co.,Ltd. Address before: 528216 Block A-2, No.3 Xiangda Road, Danzao Town, Nanhai District, Foshan City, Guangdong Province Patentee before: GUANGDONG JUMPER THERMAL TECHNOLOGY Co.,Ltd. Patentee before: GUANGDONG CHAMPON NEW ENERGY TECHNOLOGY Co.,Ltd. |