Heating and air supply system for drying chamber of conveyor grain dryer

Abstract

FIELD: agriculture.SUBSTANCE: invention relates to conveyor grain dryers used for drying various agricultural crops, namely to a system for heating and supplying air to the drying chamber of a conveyor grain dryer when burning gaseous and liquid fuel. The system for heating and supplying air to the drying chamber of a conveyor grain dryer includes at least one fire tube with a burner mounted in the end of the air heating chamber formed in the end of the grain dryer body perpendicular to its longitudinal axis, and fans supplying heated air to the drying chamber of the grain dryer, wherein the end of the air heating chamber with at least one fire tube with a burner mounted is made elongated and protruding beyond the side wall of the grain dryer body, wherein the fire tube along the length is made equal to from 0.4 to 0.9 of the width of the grain dryer body and is mounted in the heating chamber in such a way that its end from the side wall of the grain dryer body is located at a distance of from 0.25 to 0.5 of the width of the grain dryer body.EFFECT: complete combustion of fuel in the combustion tube, reduced risk of fire, reduced fuel consumption and high-quality drying of the product.1 cl, 2 dwg

Description

[0001] The invention relates to conveyor grain dryers used for drying various agricultural crops, namely to a system for heating and supplying air to the drying chamber of a conveyor grain dryer when burning gaseous and liquid fuel.

[0002] It is crucial that the fuel completely burns in the combustion chamber of the grain dryer. Incomplete combustion not only increases fuel consumption but also increases the risk of fire, leaving the product smelling of smoke and fuel. Experience shows that owners of conveyor grain dryers face difficulties in properly adjusting the burners mounted in the combustion chambers, as they must consider a variety of factors. For example, they must consider burner power, combustion chamber diameter, ambient temperature, fuel quality, and even air humidity, which is not always possible. Therefore, burners typically operate at a lower capacity, limiting their performance to positive ambient temperatures. Operating at full capacity increases the risk of fire and degrades the quality of the dried product, as it will smell of smoke and fuel.

[0003] The ATM Universal conveyor grain dryer is known for its product loading bin, upper and lower beds, a heating chamber located at the end of the dryer body with mounted fire tubes and burners, fans supplying heated air to the drying chamber, cooling zones, and product unloading zones. See the video at: https: / / yandex.ru / video / preview / 4364945906964069999.

[0004] A disadvantage of the well-known grain dryer is the unreliability of the heating chamber design. When the burners are running at full power, the fuel does not completely burn in the combustion tubes, increasing the risk of fire and degrading the quality of the dried product, as the product will smell of smoke and fuel. See the link above. Time: 1.14 - 1.17 sec.

[0005] The MOTUM conveyor grain dryer, manufactured by the Voronezh Agromash Plant, includes a product loading bin, upper and lower beds, a heating and air supply system for the drying chamber with two fire tubes with burners mounted at the end of the air heating chamber, located at the end of the grain dryer body perpendicular to its longitudinal axis, and fans supplying heated air to the drying chamber, cooling zones, and product unloading zones. Watch the video at: https: / / yandex.ru / video / preview / 12602347712264407150.

[0006] Disadvantages include the limited technological capabilities of the grain dryer, namely the heating chamber with its flame tubes and burners. Owners who purchase this conveyor grain dryer are forced to either set the burners to a lower power setting, but then the dryer will only operate when the outside temperature is above freezing, limiting its use. Or set them to full power, but then the risk of fire increases because the fuel simply doesn't burn completely, further increasing fuel consumption. See the link above, time 2:41 - 2:43.

[0007] The technical result of the proposed invention is to eliminate the shortcomings of the analogue and the prototype, namely, to expand the technological capabilities of the heating chamber, which consists in ensuring complete combustion of the fuel in the combustion tube even at maximum burner power, reducing the likelihood of a fire and increasing the operating period of the grain dryer, since high-quality drying of the product will be ensured even at sub-zero temperatures outside, while reducing fuel consumption and ensuring high-quality drying of the product.

[0008] The technical result achieved is achieved by using a combination of known features, including at least one fire tube with a burner mounted in the end of an air heating chamber made in the end of the grain dryer body perpendicular to its longitudinal axis and fans supplying heated air to the drying chamber of the grain dryer and new features, consisting in the fact that the end of the air heating chamber with at least one fire tube with a burner mounted is made elongated and protruding beyond the side wall of the grain dryer body, while the fire tube along the length is made equal to from 0.4 to 0.9 of the width of the grain dryer body and is mounted in the heating chamber in such a way that its end from the side wall of the grain dryer body is located at a distance of from 0.25 to 0.5 of the width of the grain dryer body.

[0009] The novelty of the invention is that the end of the air heating chamber with at least one fire tube with a burner mounted on it is made elongated and protruding beyond the side wall of the grain dryer housing, while the fire tube is made equal in length to 0.4 to 0.9 of the width of the grain dryer housing and is mounted in the heating chamber in such a way that its end from the side wall of the grain dryer housing is located at a distance of 0.25 to 0.5 of the width of the grain dryer housing.

[0010] A sign that the end of the air heating chamber with at least one fire tube with a burner mounted on it is made elongated and protruding beyond the side wall of the grain dryer body, ensuring complete combustion of the fuel in the fire tube, both at minimum and maximum burner power, reducing the likelihood of a fire, and also increasing the operating period of the grain dryer - the ability to operate at sub-zero temperatures outside.

[0011] For example, a flame tube length of 0.4 to 0.9 times the grain dryer body width ensures complete combustion of the fuel in the flame tube, regardless of burner power. However, if the flame tube is shorter than 0.4 times the grain dryer body width, the fuel may not burn completely, causing the dried product to smell of smoke and fuel, increasing the risk of fire. A flame tube longer than 0.9 times the grain dryer body width is impractical, as a longer flame tube will result in uneven distribution of hot air in the heating chamber. Furthermore, the flame tube may become deformed when the burners operate at maximum power, which will also negatively impact the uniform distribution of heated air.

[0012] The flame tube is installed in the heating chamber such that its end is located at a distance of 0.25 to 0.5 times the grain dryer width from the side wall of the grain dryer housing. This ensures uniform distribution of heated air to both fans. If the flame tube is shifted deeper into the heating chamber to a distance greater than 0.5 times the grain dryer width from the side wall of the grain dryer housing, the heated air flow will be weakened for the nearest fan and increased for the furthest fan, resulting in uneven temperature distribution in the drying chamber and, consequently, poor and uneven product drying. Mounting the flame tube at a distance less than 0.25 times the grain dryer width from the side wall of the grain dryer housing will result in heated air being displaced to the other fan, resulting in uneven product drying.

[0013] It is the combination of the above-mentioned features that ensures the achievement of the desired technical result: ensuring complete combustion of the fuel in the combustion tube even at maximum burner power, reducing the risk of fire, increasing the operating period of the grain dryer, since high-quality drying of the product will be ensured even at sub-zero temperatures outside, while reducing fuel consumption and maintaining the quality of the dried product.

[0014] Since the proposed combination of features is not known from the existing level of technology and does not follow from it explicitly - it allows for a higher technical result to be obtained, then the proposed essential features and their combination can be considered to have an inventive step.

[0015] According to the conducted patent information research, no combination of known and new features of the proposed invention was found in the sources of patent and scientific and technical information, which allows us to classify the features as having novelty.

[0016] The description of the implementation of the proposed invention allows it to be classified as industrially feasible.

[0017] Fig. 1 schematically shows the placement of the flame tube in the heating chamber – view 3 / 4.

[0018] Fig. 2 schematically shows the flame tube in the heating chamber - top view.

[0019] The system for heating and supplying air to the drying chamber of a conveyor grain dryer consists of at least one flame tube 1 with a burner 2 mounted in the end of an air heating chamber 3, formed in the end of the housing 4 of the grain dryer perpendicular to its longitudinal axis and fans 5 supplying heated air to the drying chamber 6 of the grain dryer. In this case, the end of the air heating chamber 3 with at least one flame tube 1 with a burner 2 mounted is made elongated and protrudes beyond the side wall of the housing 4 of the grain dryer. The length of the fire tube 1 is made equal to 0.4 to 0.9 of the width of the body 4 of the grain dryer and is mounted in the heating chamber 3 in such a way that its end 7 from the side wall of the body 4 of the grain dryer is located at a distance of 0.25 to 0.5 of the width of the body 4 of the grain dryer.

[0020] The heating and air supply system in the drying chamber of the conveyor grain dryer operates as follows:

[0021] The length of the air heating tubes 1 is equal to 0.6 times the width of the grain dryer housing and are mounted in the heating chamber 3 such that their end 7 is located at a distance of 0.5 times the width of the grain dryer housing from the side wall 4 of the grain dryer housing. The feature concerning the fact that the end of the air heating chamber 3 is made elongated and protruding beyond the side wall of the grain dryer housing 4 allows for the manufacture of the air heating tubes of the specified length and the placement of their ends at the specified distance. After the burners 2 are turned on, a stream of air heated by the burners enters the air heating chamber 3 through the air heating tubes 1. The burners 2 operate at full power, while the length of the air heating tube 1 is equal to 0.6 times the width of the grain dryer housing, ensuring complete combustion of the fuel. If, during the manufacture of a grain dryer, it is necessary to install a more powerful burner, then, accordingly, both the length of the flame tube 1 and the distance of the ends from the side wall of the grain dryer body are increased.The location of the end 7 of the flame tube 1 from the side wall of the body 4 of the grain dryer at a distance of 0.5 times the width of the body of the grain dryer ensures uniform distribution and flow of heated air into the fans 5, then into the drying chamber 6. This eliminates the occurrence of a zone of low temperature heating in the drying chamber of the grain dryer and, due to the uniformity of the air flow entering the fans, high-quality drying of the product is ensured.

[0022] At the same time, the combination of features reduced the risk of fire, and the grain dryer ensured high-quality drying of the product at a negative outdoor temperature of -8 degrees.

Claims

A system for heating and supplying air to a drying chamber of a conveyor grain dryer, including at least one fire tube with a burner mounted in the end of an air heating chamber formed in the end of a grain dryer body perpendicular to its longitudinal axis, and fans supplying heated air to the drying chamber of the grain dryer, characterized in that the end of the air heating chamber with at least one fire tube with a burner mounted on it is made elongated and protruding beyond the side wall of the grain dryer body, wherein the fire tube is made equal in length to 0.4 to 0.9 of the width of the grain dryer body and is mounted in the heating chamber in such a way that its end from the side wall of the grain dryer body is located at a distance of 0.25 to 0.5 of the width of the grain dryer body.

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