阅读说明：本技术 防球团爆裂的链箅机热风系统 (Prevent chain grate machine hot air system that pelletizing bursts ) 是由 邢守正 王群 于 2021-08-04 设计创作，主要内容包括：本发明属于球团矿生产技术领域,尤其是涉及一种防球团爆裂的链箅机热风系统,其特征在于在链箅机预热I段上罩左右两侧墙上分别设置预热I段上罩侧墙混风箱Ⅰ、预热I段上罩侧墙混风箱Ⅱ、预热I段上罩侧墙混风箱Ⅲ和预热I段上罩侧墙混风箱Ⅳ,在预热I段上罩顶部热风管道上分别设有预热I段上罩侧墙热风管道Ⅰ、预热I段上罩侧墙热风管道Ⅱ、预热I段上罩侧墙热风管道Ⅲ和预热I段上罩侧墙热风管道Ⅳ。本发明的混风结构,可以使链箅机预热段上罩内的温度形成均匀的梯度分布,还可以使链箅机抽风干燥段和预热I段连接处温度接近,防止未干燥完的生球进入预热I段后产生爆裂。(The invention belongs to the technical field of pellet production, and particularly relates to a pellet burst prevention hot air system of a chain grate machine. The air mixing structure can ensure that the temperature in the upper cover of the preheating section of the chain grate machine forms uniform gradient distribution, and the temperature at the joint of the air draft drying section and the preheating I section of the chain grate machine is close to prevent raw balls which are not dried from bursting after entering the preheating I section.)

1. A hot air system of a chain grate machine for preventing pellet bursting comprises a chain grate machine blast drying section, a chain grate machine exhaust drying section, a chain grate machine preheating I section, a chain grate machine preheating II section, a chain grate machine preheating I section upper cover, a preheating I section upper cover top hot air pipeline, and a partition wall between the chain grate machine exhaust drying section and the preheating I section, and is characterized in that a preheating I section upper cover side wall mixed air box I, a preheating I section upper cover side wall mixed air box II, a preheating I section upper cover side wall mixed air box III and a preheating I section upper cover side wall mixed air box IV are respectively arranged on the left side wall and the right side wall of the chain grate machine preheating I section upper cover, a preheating I section upper cover top hot air pipeline I, a preheating I section upper cover side wall hot air pipeline II, a preheating I section upper cover side wall hot air pipeline III and a preheating I section upper cover side wall mixed air box IV are respectively arranged on the preheating I section upper cover top hot air pipeline,

the preheating I section upper cover side wall hot air pipeline I is connected with the preheating I section upper cover side wall air mixing box I, the preheating I section upper cover side wall hot air pipeline II is connected with the preheating I section upper cover side wall air mixing box II, the preheating I section upper cover side wall hot air pipeline III is connected with the preheating I section upper cover side wall air mixing box III, the preheating I section upper cover side wall hot air pipeline IV is connected with the preheating I section upper cover side wall air mixing box IV,

the preheating I section upper cover side wall air mixing box I and the preheating I section upper cover side wall air mixing box II are symmetrically arranged on the left side wall and the right side wall of the upper cover of the preheating I section of the chain grate machine, the preheating I section upper cover side wall air mixing box III and the preheating I section upper cover side wall air mixing box IV are symmetrically arranged on the left side wall and the right side wall of the upper cover of the preheating I section of the chain grate machine,

the height of a partition wall between the air draft drying section and the preheating I section of the chain grate machine is 200mm-250 mm.

2. The pellet burst preventing grate hot air system as claimed in claim 1, wherein electric butterfly valves are respectively arranged on the preheating I section upper cover side wall hot air pipeline I, the preheating I section upper cover side wall hot air pipeline II, the preheating I section upper cover side wall hot air pipeline III and the preheating I section upper cover side wall hot air pipeline IV.

3. The pellet burst preventing grate hot air system as claimed in claim 1, wherein the preheating section I upper cover side wall air mixing box I, the preheating section I upper cover side wall air mixing box ii, the preheating section I upper cover side wall air mixing box iii and the preheating section I upper cover side wall air mixing box iv are respectively provided with a cooling air adding valve, and each cooling air adding valve is welded on an end plate of the corresponding air mixing box.

4. The pellet burst preventing grate hot air system as claimed in claim 1, wherein a thermocouple is provided at the junction of each air mixing box and the side wall of the upper cover of the preheating section I of the grate.

Technical Field

The invention belongs to the technical field of pellet production, and particularly relates to a grate hot air system for preventing pellets from bursting.

Background

In the pellet production process, the chain grate machine is divided into an air blowing drying section, an air draft drying section, a preheating I section and a preheating II section according to the process division. The drying section is used for drying the green pellets from the pellet making chamber and drying the moisture in the green pellets by hot air. The preheating section preheats green balls without water, so that the green balls can reach the strength of entering the kiln. If the moisture of the green pellets is not completely dried in the drying section of the chain grate machine, the green pellets with some moisture enter the preheating section I, and due to the existence of the burst temperature, when the temperature in the preheating section I is higher than the burst temperature of the green pellets, the green pellets burst in the preheating section I of the chain grate machine, a large amount of dust is generated, not only can the ring formation of the rotary kiln be caused, but also the adhesion of the grate plate holes of the chain grate machine can be caused, and the production is seriously influenced.

The temperature of hot air contacted with the green pellets in the blowing drying section of the chain grate machine is 200 ℃, the temperature of hot air contacted with the exhausting drying section is 350 ℃, and the two temperatures are basically lower than the bursting temperature of the green pellets. The temperature of hot air in the preheating I section of the chain grate machine is 650 ℃, the temperature gradient is increased radically, and green balls with moisture are cracked after entering the preheating I section.

In the most original design, hot air (650 ℃) from the second cooling section of the circular cooler directly enters the upper cover of the preheating I section of the chain grate machine through a pipeline, and the design directly causes green pellets to burst in the preheating I section. In the later improvement, the improvement design is that a part of hot air (350 ℃) going to the air draft drying section is added into the upper cover of the preheating I section of the chain grate machine through a pipeline, so that the temperature of the upper cover at the joint of the air draft drying section and the preheating I section of the chain grate machine is lower than 650 ℃, and the temperature is prevented from rising unnecessarily; the design is that the partition wall between the exhausting and drying section and the preheating section I of the chain grate machine is lifted, and the temperature at the joint of the two sections is expected to be reduced by mixed air. The two designs reduce the temperature of the upper cover at the joint of the air draft drying section and the preheating I section of the chain grate machine in an air mixing mode, so that the temperature gradient inside the chain grate machine stably rises, and the risk of green pellets bursting is reduced. The two designs reduce the risk of green ball bursting, but the effect of mixed wind cannot be artificially controlled in actual production, and the phenomenon of green ball falling can be caused. Moreover, the first design is that hot air originally going to the ventilation drying section of the chain grate machine is added into the preheating section I, so that the drying effect of the ventilation drying section of the chain grate machine can be reduced.

Disclosure of Invention

The invention aims to provide a novel chain grate hot air system for preventing pellets from bursting so as to overcome the defects in the prior art.

The purpose of the invention is realized by the following technical scheme:

the invention relates to a hot air system of a chain grate machine for preventing pellet bursting, which comprises a chain grate machine blast drying section, a chain grate machine exhaust drying section, a chain grate machine preheating I section, a chain grate machine preheating II section, a chain grate machine preheating I section upper cover, a preheating I section upper cover top hot air pipeline, and a partition wall between the chain grate machine exhaust drying section and the preheating I section, and is characterized in that a preheating I section upper cover side wall mixed air box I, a preheating I section upper cover side wall mixed air box II, a preheating I section upper cover side wall mixed air box III and a preheating I section upper cover side wall mixed air box IV are respectively arranged on the left side wall and the right side wall of the chain grate machine preheating I section upper cover, a preheating I section upper cover top hot air pipeline I, a preheating I section upper cover side wall mixed air pipeline II, a preheating I section upper cover side wall mixed air pipeline III and a preheating I section upper cover side wall mixed air box IV are respectively arranged on the preheating I section upper cover top hot air pipeline,

the preheating I section upper cover side wall hot air pipeline I is connected with the preheating I section upper cover side wall air mixing box I, the preheating I section upper cover side wall hot air pipeline II is connected with the preheating I section upper cover side wall air mixing box II, the preheating I section upper cover side wall hot air pipeline III is connected with the preheating I section upper cover side wall air mixing box III, the preheating I section upper cover side wall hot air pipeline IV is connected with the preheating I section upper cover side wall air mixing box IV,

the preheating I section upper cover side wall air mixing box I and the preheating I section upper cover side wall air mixing box II are symmetrically arranged on the left side wall and the right side wall of the upper cover of the preheating I section of the chain grate machine, the preheating I section upper cover side wall air mixing box III and the preheating I section upper cover side wall air mixing box IV are symmetrically arranged on the left side wall and the right side wall of the upper cover of the preheating I section of the chain grate machine,

the height of a partition wall between the air draft drying section and the preheating I section of the chain grate machine is 200mm-250 mm.

Electric butterfly valves are respectively arranged on the preheating I section upper cover side wall hot air pipeline I, the preheating I section upper cover side wall hot air pipeline II, the preheating I section upper cover side wall hot air pipeline III and the preheating I section upper cover side wall hot air pipeline IV.

And the preheating I section upper cover side wall air mixing box I, the preheating I section upper cover side wall air mixing box II, the preheating I section upper cover side wall air mixing box III and the preheating I section upper cover side wall air mixing box IV are respectively provided with a cold air mixing valve, and each cold air mixing valve is welded on an end plate of the corresponding air mixing box.

And a thermocouple is arranged at the joint of each air mixing box and the side wall of the upper cover of the preheating I section of the chain grate machine.

The invention has the advantages that:

(1) the hot air system of the chain grate machine for preventing pellet bursting reduces the height of the partition wall, so that no air mixing is realized at the partition wall between the air draft drying section and the preheating I section of the chain grate machine as much as possible, and the temperature gradient is convenient to control;

(2) according to the hot air system of the chain grate machine for preventing pellet bursting, the air exhaust drying section of the chain grate machine is not used as a pipeline for preheating the air mixing section I, so that all hot air is used by the air exhaust drying section, and the drying strength is enhanced;

(3) according to the hot air system of the chain grate machine for preventing pellets from bursting, hot air enters from two sides of the upper cover of the preheating section I of the chain grate machine, the hot air is mixed before entering the upper cover, and the mixed hot air enters the upper cover of the section I of the chain grate machine, so that the temperature is artificially controlled, the temperature gradient in the upper cover of the chain grate machine is stably increased, the bursting temperature is completely eradicated, and the risk of green pellets bursting in the chain grate machine is reduced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a view a-a of fig. 1 of the present invention.

FIG. 3 is a view B-B of FIG. 1 of the present invention.

Detailed Description

The following further describes the embodiments of the present invention with reference to the drawings.

As shown in figures 1-3, the pellet burst preventing hot air system of the chain grate machine comprises a chain grate machine air blowing drying section 1, a chain grate machine air draft drying section 2, a chain grate machine preheating I section 3, a chain grate machine preheating II section 4, a chain grate machine preheating I section upper cover 6, a preheating I section upper cover top hot air pipeline 7 and a partition wall 5 between the chain grate machine air draft drying section and the preheating I section, and is characterized in that a preheating I section upper cover side wall mixed air box I12, a preheating I section upper cover side wall mixed air box II 13, a preheating I section upper cover mixed air box III 14 and a preheating I section upper cover side wall mixed air box IV 15 are respectively arranged on the left side wall and the right side wall of the chain grate machine preheating I section upper cover 6, a preheating I section upper cover side wall preheated air pipeline I8, a preheating I section upper cover hot air pipeline II 9, a preheating I section upper cover side wall preheated I section upper cover side wall mixed air pipeline 10 and a preheating I section upper cover hot air pipeline IV 11 are respectively arranged on the preheating I section upper cover top hot air pipeline 7,

the preheating I-section upper cover side wall hot air pipeline I8 is connected with the preheating I-section upper cover side wall air mixing box I12, the preheating I-section upper cover side wall hot air pipeline II 9 is connected with the preheating I-section upper cover side wall air mixing box II 13, the preheating I-section upper cover side wall hot air pipeline III 10 is connected with the preheating I-section upper cover side wall air mixing box III 14, the preheating I-section upper cover side wall hot air pipeline IV 11 is connected with the preheating I-section upper cover side wall air mixing box IV 15,

the preheating I section upper cover side wall air mixing box I12 and the preheating I section upper cover side wall air mixing box II 13 are symmetrically arranged on the left side wall and the right side wall of the preheating I section upper cover 6 of the chain grate machine, the preheating I section upper cover side wall air mixing box III 14 and the preheating I section upper cover side wall air mixing box IV 15 are symmetrically arranged on the left side wall and the right side wall of the preheating I section upper cover 6 of the chain grate machine,

the height of a partition wall 5 between the air draft drying section and the preheating I section of the chain grate machine is 200mm-250 mm.

And electric butterfly valves 18 are respectively arranged on the preheating I section upper cover side wall hot air pipeline I8, the preheating I section upper cover side wall hot air pipeline II 9, the preheating I section upper cover side wall hot air pipeline III 10 and the preheating I section upper cover side wall hot air pipeline IV 11.

And the preheating I section upper cover side wall air mixing box I12, the preheating I section upper cover side wall air mixing box II 13, the preheating I section upper cover side wall air mixing box III 14 and the preheating I section upper cover side wall air mixing box IV 15 are respectively provided with a cold air charging valve 17, and each cold air charging valve 17 is welded on an end plate of the corresponding air mixing box.

A thermocouple 16 is arranged at the joint of each air mixing box and the side wall of the upper cover 6 of the preheating section I of the chain grate machine.

The invention discloses a hot air system of a grate machine for preventing pellets from bursting, which adopts a hot air structure of mixing air of an external wind mixing box on the side wall of an upper cover 6 of a preheating section I of the grate machine. The novel air mixing structure can enable the temperature in the upper cover 6 of the preheating section of the chain grate machine to form uniform gradient distribution, and can also enable the temperature at the joint of the preheating I section 3 of the chain grate machine to be close to that of the exhausting and drying section 2 of the chain grate machine, so that raw balls which are not dried are prevented from bursting after entering the preheating I section 3 of the chain grate machine.

The left side wall and the right side wall of an upper cover 6 of a preheating I section of the chain grate machine are respectively provided with an upper cover side wall air mixing box I12 of the preheating I section, an upper cover side wall air mixing box II 13 of the preheating I section, an upper cover side wall air mixing box III 14 of the preheating I section and an upper cover side wall air mixing box IV 15 of the preheating I section; (in the scheme, the length of the preheating I section 3 of the chain grate machine is assumed to be 6 meters, and the air mixing boxes are arranged in groups of every 3 meters, if the length is lengthened, the number of the air mixing boxes is increased at the same time, and the length of the preheating I section is generally designed to be a multiple of 3 meters).

Hot air from the second cooling section of the circular cooler enters a preheating I section upper cover top hot air pipeline 7, then four pipelines are respectively led out from the preheating I section upper cover top hot air pipeline 7 to preheat an I section upper cover side wall hot air pipeline I8, a preheating I section upper cover side wall hot air pipeline II 9, a preheating I section upper cover side wall hot air pipeline III 10 and a preheating I section upper cover side wall hot air pipeline IV 11, and the four pipelines are respectively inserted into a wind mixing box corresponding to the side wall of the chain grate preheating I section upper cover 6.

Four electric butterfly valves 18 (adjustment type) are respectively installed on the four pipes. The air quantity and the temperature entering the air mixing box are controlled by adjusting the opening degree of the electric butterfly valve 18.

The end part of each air mixing box is provided with a cold air mixing valve 17. A thermocouple 16 is arranged at the joint of each air mixing box and the side wall of the upper cover 6 of the preheating section I of the chain grate machine. The gas temperature in the hearth can be adjusted by interlocking the thermocouple 16 with the combustion fan. The temperature of the hot air after air mixing is observed on line through a thermocouple 16, and if the temperature reaches a desired value, a cold air mixing valve 17 can be closed; if the mixed air temperature is higher than the expected value, the cool air charging valve 17 is opened, the opening degree of the valve is adjusted, and the cold air intake amount is controlled until the requirement is met.

The hot air pipeline 7 at the top of the upper cover of the preheating I section is generally designed into a circular pipeline, the diameter of the circular pipeline is 3.3m, and the length of the circular pipeline is consistent with that of the preheating I section 3 of the chain grate machine. The pipeline is made of Q235 steel plates with the thickness of 10mm, and corundum refractory castable with the thickness of 230mm is poured on the inner wall of the pipeline.

Each mixing box is generally designed as a circular box with a diameter of 2.5m and a length of 3 m. Is made of Q235 steel plates with the thickness of 10mm, and corundum refractory castable with the thickness of 100mm is poured on the inner wall.

Preheating I section upper shield side wall hot-blast main I8, preheating I section upper shield side wall hot-blast main II 9, preheating I section upper shield side wall hot-blast main III 10 and preheating I section upper shield side wall hot-blast main IV 11, one end welding is on preheating I section upper shield top hot-blast main 7, one end and preheating I section side wall both sides wind mixing box welding. The pipe is generally designed into a circular pipeline, the diameter of the pipe is 2m, the pipe is made of a No. Q235 steel plate with the thickness of 10, and corundum refractory castable with the thickness of 100mm is poured on the inner wall of the pipe.

According to the hot air system of the chain grate machine for preventing pellet bursting, the height of the partition wall 5 between the air draft drying section and the preheating I section of the chain grate machine is reduced, so that air mixing is avoided at the partition wall 5 between the air draft drying section and the preheating I section of the chain grate machine as much as possible, and the temperature gradient is conveniently controlled; the air draft drying section 2 of the chain grate machine is omitted, and the air mixing pipeline of the preheating I section 3 of the chain grate machine is used, so that all hot air is used by the air draft drying section 2 of the chain grate machine, and the drying strength is enhanced; hot air enters from two sides of the upper cover 6 of the preheating I section of the chain grate machine, the hot air is mixed before entering the upper cover, the mixed hot air enters the upper cover 6 of the preheating I section of the chain grate machine, the temperature is controlled manually, the temperature gradient in the upper cover 6 of the preheating I section of the chain grate machine is stably increased, the existence of bursting temperature is avoided, and the risk of bursting of green pellets in the chain grate machine is reduced.