Curing process of flue-curing barn

Abstract

The invention discloses a curing process of a flue-curing barn, and belongs to the technical field of a tobacco curing. The process comprises the following steps: an ignition and temperature control stage: heating and roasting by utilizing an air source heat pump unit independently; tobacco leaf yellowing stage: heating and roasting by utilizing the air source heat pump unit independently; tobacco leaf color fixing stage: heating by utilizing the air source heat pump unit independently when a dry-bulb temperature is between 44 and 50 DEG C, and heating by using a coal burning boiler independently when the dry-bulb temperature rises to over 50 DEG C; and a tobacco leaf stem drying stage: heating by using the coal burning boiler independently. The curing process has the advantages of safetyand insurance, strong operability, stability of tobacco leaf color fixation, good leaf shrinkage, great improvement of flavor quantity of tar and tobacco leaves, is simple to operate; and the technical scheme of the roasting process has strong operability, so that the tobacco leaf curing quality and superior leaf ratio can be remarkably improved, the tobacco leaf dry matter consumption is reduced, and the roasting effects of saving energy, reducing emission, increasing quality and improving efficiency can be achieved.

Description

technical field

[0001] The invention relates to a baking process of a barn, in particular to a process of using a mixed energy barn for baking. Background technique

[0002] In recent years, due to the advantages of simple operation, energy saving and consumption reduction, and better quality of cured tobacco leaves, intensive curing barns have been rapidly popularized and applied nationwide, which is a major change in the history of tobacco leaf curing in my country. The baking principle of the dense barn is basically the same as that of the ordinary barn, but because the tobacco leaves are densely packed together, mechanical forced ventilation is adopted, and hot air is used for heating. According to the law, its baking technology is preliminarily summarized as "high temperature fully turns yellow and slow roasting, temperature control'two dragging'slowly fixes color, rapid fire kills gluten", that is, "one high, two slow and one fast" baking technology. The characteristi...

Examples

Embodiment 1

[0028] A baking process for flue-cured tobacco, comprising the following steps:

[0029] The first step, fire temperature control: After the tobacco leaves are loaded into the furnace, ignite, then raise the dry bulb temperature to 34°C at a temperature change rate of 1.5°C / h, and then raise the dry bulb temperature to 34°C at a temperature change rate of 1°C / h 36°C, wet bulb temperature 34°C, at this time, electric energy is independently used to drive the air source heat pump unit for heating and baking;

[0030] The second step, the yellowing stage of tobacco leaves: raise the dry bulb temperature of the lower tobacco leaves to 40°C, and the wet bulb temperature to 36°C; raise the dry bulb temperature of the upper and middle tobacco leaves to 44°C, and the wet bulb temperature to 38°C, The heating rate is 0.5°C / h; the control index of this step: the yellowing degree of the lower part of the tobacco is 90% to 90% yellow; the yellowing degree of the middle and upper part of the...

Embodiment 2

[0037] The first step, fire temperature control: after the tobacco leaves are loaded into the furnace, ignite, then raise the dry bulb temperature to 35°C at a temperature change rate of 2°C / h, and then raise the dry bulb temperature to 35°C at a temperature change rate of 1°C / h 37°C, wet bulb temperature 35°C, at this time, electric energy is independently used to drive the air source heat pump unit for heating and drying;

[0038] The second step, the yellowing stage of tobacco leaves: the dry bulb temperature of the lower tobacco leaves is raised to 41°C, and the wet bulb temperature is raised to 37°C; the dry bulb temperature of the middle and upper tobacco leaves is raised to 43°C, and the wet bulb temperature is raised to 36°C, The heating rate is 0.5°C / h; the control index of this step: the yellowing degree of the lower tobacco reaches 90% to 95% yellowing; the yellowing degree of the middle and upper tobacco leaves reaches 100% or nearly 100% yellowing, and the leaves a...

Embodiment 3

[0044] In the first step, after the tobacco leaves are loaded into the furnace, light the fire, then raise the dry bulb temperature to 35°C at a temperature change rate of 2°C / h, and then raise the dry bulb temperature to 36°C at a temperature change rate of 1°C / h. Bulb temperature 35°C. Make the tip of the lower tobacco leaf on the bottom platform turn yellow by 4 cm, the tip of the middle tobacco leaf by about 7 cm, and the tip of the upper tobacco leaf by about 10 cm. After reaching this goal, turn to the next stage of baking;

[0045] The second step, the yellowing stage of tobacco leaves: the dry bulb temperature of the lower tobacco leaves is raised to 40°C, and the wet bulb temperature is raised to 37°C; the dry bulb temperature of the middle and upper tobacco leaves is raised to 44°C, and the wet bulb temperature is raised to 38°C, The heating rate is 0.5°C / h; the lower tobacco leaves of the bottom table are close to the yellow veins, the middle tobacco leaves are yell...

technical field

[0001] The invention relates to a baking process of a barn, in particular to a process of using a mixed energy barn for baking. Background technique

[0002] In recent years, due to the advantages of simple operation, energy saving and consumption reduction, and better quality of cured tobacco leaves, intensive curing barns have been rapidly popularized and applied nationwide, which is a major change in the history of tobacco leaf curing in my country. The baking principle of the dense barn is basically the same as that of the ordinary barn, but because the tobacco leaves are densely packed together, mechanical forced ventilation is adopted, and hot air is used for heating. According to the law, its baking technology is preliminarily summarized as "high temperature fully turns yellow and slow roasting, temperature control'two dragging'slowly fixes color, rapid fire kills gluten", that is, "one high, two slow and one fast" baking technology. The characteristi...

Examples

Embodiment 1

[0028] A baking process for flue-cured tobacco, comprising the following steps:

[0029] The first step, fire temperature control: After the tobacco leaves are loaded into the furnace, ignite, then raise the dry bulb temperature to 34°C at a temperature change rate of 1.5°C / h, and then raise the dry bulb temperature to 34°C at a temperature change rate of 1°C / h 36°C, wet bulb temperature 34°C, at this time, electric energy is independently used to drive the air source heat pump unit for heating and baking;

[0030] The second step, the yellowing stage of tobacco leaves: raise the dry bulb temperature of the lower tobacco leaves to 40°C, and the wet bulb temperature to 36°C; raise the dry bulb temperature of the upper and middle tobacco leaves to 44°C, and the wet bulb temperature to 38°C, The heating rate is 0.5°C / h; the control index of this step: the yellowing degree of the lower part of the tobacco is 90% to 90% yellow; the yellowing degree of the middle and upper part of the...

Embodiment 2

[0037] The first step, fire temperature control: after the tobacco leaves are loaded into the furnace, ignite, then raise the dry bulb temperature to 35°C at a temperature change rate of 2°C / h, and then raise the dry bulb temperature to 35°C at a temperature change rate of 1°C / h 37°C, wet bulb temperature 35°C, at this time, electric energy is independently used to drive the air source heat pump unit for heating and drying;

[0038] The second step, the yellowing stage of tobacco leaves: the dry bulb temperature of the lower tobacco leaves is raised to 41°C, and the wet bulb temperature is raised to 37°C; the dry bulb temperature of the middle and upper tobacco leaves is raised to 43°C, and the wet bulb temperature is raised to 36°C, The heating rate is 0.5°C / h; the control index of this step: the yellowing degree of the lower tobacco reaches 90% to 95% yellowing; the yellowing degree of the middle and upper tobacco leaves reaches 100% or nearly 100% yellowing, and the leaves a...

Embodiment 3

[0044] In the first step, after the tobacco leaves are loaded into the furnace, light the fire, then raise the dry bulb temperature to 35°C at a temperature change rate of 2°C / h, and then raise the dry bulb temperature to 36°C at a temperature change rate of 1°C / h. Bulb temperature 35°C. Make the tip of the lower tobacco leaf on the bottom platform turn yellow by 4 cm, the tip of the middle tobacco leaf by about 7 cm, and the tip of the upper tobacco leaf by about 10 cm. After reaching this goal, turn to the next stage of baking;

[0045] The second step, the yellowing stage of tobacco leaves: the dry bulb temperature of the lower tobacco leaves is raised to 40°C, and the wet bulb temperature is raised to 37°C; the dry bulb temperature of the middle and upper tobacco leaves is raised to 44°C, and the wet bulb temperature is raised to 38°C, The heating rate is 0.5°C / h; the lower tobacco leaves of the bottom table are close to the yellow veins, the middle tobacco leaves are yell...

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