Cooling and drying synchronizing method for rotary hearth furnace

A technology of rotary hearth furnace and cold air, which is applied in the field of mechanical equipment, can solve the problems of many equipment and corresponding auxiliary facilities, occupy a lot of land, and low utilization rate of red ball sensible heat, etc., and achieve easy processing and production, low cost and simple structure Effect

Active Publication Date: 2016-02-24
SHANDONG IRON & STEEL CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the raw ball and the red ball are dried and cooled separately in the existing rotary hearth furnace, and the problems of large area occupation...
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Abstract

The invention relates to a cooling and drying synchronizing method for a rotary hearth furnace. The method specifically includes the following steps that firstly, red pellets of the rotary hearth furnace uniformly fall on a lower-layer chain plate at a feeding end A2 through a first guiding chute, and meanwhile green pellets of the rotary hearth furnace uniformly fall on an upper-layer chain plate at a feeding end B1 through a first distributor; secondly, it is guaranteed that the rotation direction of the upper-layer chain plate and the rotation direction of the lower-layer chain plate are opposite by adjusting the rotating speed of both the upper-layer chain plate and lower-layer chain plate; thirdly, cold air ascends and penetrates through the red pellets on the lower-layer chain plate so as to cool the red pellets, and meanwhile the temperature of the cold air increases, so that the cold air is changed into pre-heated air; fourthly, the pre-heated air continues to ascend and penetrates through the green pellets on the upper-layer chain plate so as to dry and pre-heat the green pellets, and meanwhile the temperature of the pre-heated air decreases, so that the pre-heated air is changed into hot air containing certain heat; and finally, the hot air is pumped out, enters a dust falling room, then enters a dust removing room from the dust falling room and is transferred into an air pre-heating system in the rotary hearth furnace through the dust removing room for use.

Application Domain

Rotary drum furnaces

Technology Topic

Composite materialHeating system +5

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  • Cooling and drying synchronizing method for rotary hearth furnace
  • Cooling and drying synchronizing method for rotary hearth furnace
  • Cooling and drying synchronizing method for rotary hearth furnace

Examples

  • Experimental program(1)

Example Embodiment

[0035] The present invention will now be further described with reference to the drawings.
[0036] Such as figure 1 , As shown in 2, 3, an efficient device for synchronizing cooling and drying in a rotary hearth furnace is provided. The device includes: a bearing seat 1, a first bearing 2, a second bearing 14, an upper chain plate 3, and a lower layer Chain plate 13, exhaust fan 4, casing 5, upper partition wall 15, middle partition wall 6, lower partition wall 16, access door 7, bellows 8, baffle plate 9, support frame 10, reducer 11 and drive motor 12 .
[0037] The two ends of the upper chain plate 3 are respectively installed and connected to the first bearing 2, the lower chain plate 13 is respectively installed and connected to the second bearing 14, and the first bearing 2 and The second bearing 14 is fixed on the bearing housing 1 in an up-and-down position relationship, the first bearing 2, the second bearing 14, and the bearing housing 1 are all located in the machine Outside the housing 5; the housing 5 is placed on the support frame 10, the access door 7 is opened on the housing 5, and the access door 7 is placed in the housing 5 In the middle part of the case, the wind box 8 is located above the casing 5, and the exhaust fan 4 is located above the wind box 8; inside the casing 5, the upper partition wall 15 Located on the upper chain plate 3; the middle partition wall 6 is located between the upper chain plate 3 and the lower chain plate 13; the lower partition wall 16 is located on the lower chain plate Below the plate 13; one end of the reducer 11 is coaxial with the first bearing 2, and the other end is coaxial with the drive motor 12.
[0038] Such as Figure 5 As shown, the first bearing and the second bearing are connected by a first transmission gear 21 and a second transmission gear 22.
[0039] A gap is left between the upper partition wall 15 and the upper chain plate 3.
[0040] There is a gap between the middle partition wall 6 and the upper chain plate 3 and the lower chain plate 13.
[0041] One end of the lower partition wall 16 is fixed with the support frame 10, and the other end is left with a gap with the lower chain plate 13.
[0042] Such as figure 1 As shown, inside the casing 5, there are three chambers and each chamber has the above-mentioned structure. Such as Figure 4 As shown, the casing is divided into a watch case 17, an insulation layer 18 and a refractory layer 19.
[0043] The upper chain plate adopts a net chain with a temperature resistance of 350°C, the lower chain plate adopts a chain plate with a temperature resistance of 900°C, and the chain plate is coated with a high temperature resistant layer, which can withstand high temperature of 1250°C.
[0044] The feed temperature of the green balls is 40°C, and the feed temperature of the red balls is 1050°C.
[0045] Such as figure 1 , As shown in 6, provides a method for synchronizing cooling and drying in a rotary hearth furnace. The specific steps are as follows:
[0046] Step 1) Start the drive motor 12 to make the equipment operate normally, and evenly drop the red balls of the rotary hearth furnace on the feeding end A of the cooling and drying synchronous high-efficiency device through the first guide groove 2 On the lower chain plate 13, at the same time, the rotary hearth furnace green balls are evenly dropped on the feeding end B of the device through the first distributor 1 The upper chain plate;
[0047] Step 2) Adjust the rotation speed of the upper chain plate 3 and the lower chain plate 13 through the speed reducer 11 to ensure that the rotation directions of the two are opposite and they operate independently;
[0048] Step 3) When the exhaust fan 4 in the device is working normally, the cold air rises and passes through the red ball on the lower chain plate 13 in the device to cool the red ball. At the same time, the temperature of cold air increases and turns into preheated air;
[0049] Step 4) The preheated air continues to rise, and then passes through the green balls on the upper chain plate 3, and the green balls are dried and preheated. At the same time, the temperature of the preheated air drops and turns into a certain amount of heat. hot air;
[0050] Step 5) The hot air is drawn out by the exhaust fan 4, enters the dust reduction chamber, and then enters the dust removal chamber from the dust reduction chamber, and is transferred to the air preheating furnace in the rotary hearth furnace through the dust removal chamber. Used in thermal systems;
[0051] Step 6) The finished pellets of red balls cooled to a suitable temperature are discharged from the discharge end B of the lower chain plate 13 2 Lead out and enter the subsequent conveying device through the second guide groove; large particles of red ball and scrap fall into the return bin along the lower chain plate 13 through the baffle plate, and small particles or The powdered red ball scraps enter the dust removal room with the preheated air;
[0052] Step 7) The raw balls dried to a certain temperature are discharged from the discharge end A of the upper chain plate 13 1 Lead out and convey to the second distributor, the large particles of green pellets fall into the return bin along the upper chain plate 3 through the baffle plate, small particles or powdered green pellets The scraps enter the dust removal chamber along with the preheated air.
[0053] When the green balls are exported, the temperature is controlled at 280°C to 300°C, and when the red balls are exported, the temperature is controlled at ≤ 150°C. Through this method, the utilization rate of the red ball sensible heat is increased to more than 70%, and the energy consumption of the rotary hearth furnace process is reduced by more than 15%.
[0054] In other specific embodiments, one end of the first reducer is coaxial with the first bearing, and the other end is coaxial with the first drive motor; one end of the second reducer is coaxial with the second bearing , And its other end is coaxial with the second drive motor.

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