KR20130027115A - Energy saving glass bead shaft kiln production development - Google Patents

Abstract

PURPOSE: An energy saving shaft kiln for producing a glass bead is provided to collect exhaust heat and residue using a plate-type heat exchanger. CONSTITUTION: An energy saving shaft kiln for producing a glass bead comprises a double layer of a shaft kiln(01) main body and an amplifying chamber(03). The shaft kiln collects heat using a gap between the layers as a duct. The heat is used for combustion and as secondary air. The shaft kiln cools the wall body for preventing cullet adhesion or incomplete firing. [Reference numerals] (3) Amplifying chamber; (AA) Gas burner attachment part; (BB) Cullet inlet; (CC) Shaft Klin main body; (DD) Exhaustion; (EE) Shaft Kiln distribution diagram

Description

Energy Saving Glass Bead Shaft Kiln Production Development

The present invention relates to a glass bead produced by an industrial furnace, and the production method is controlled by viscous in an updraft when a cylinder is put on top of a furnace combustion site, and is flowed in an expanded amplification chamber after rising by an airflow. It is separated by weakening and temperature drop and the remaining amount is continuously raised. It is related to the production of Glass Bead which is collected by the dust collector installed outside. It is energy saving which saves heat energy by collecting and reusing the heat dissipation and heat dissipation process. It's about Shaft Kiln, a kind of elder brother.

Glass beads of 106 ~ 850㎛ are widely used throughout the industry, but this method is mainly because Shaft Kiln flotation molding method is the most economical through various methods. It is used.

However, the existing Shaft Kiln wastes a large amount of thermal energy depending on the heat dissipation and arrangement, so the double structure of the main body and the expansion chamber wall captures the heat dissipated by perfusion, and the exhaust heat collects the remnants of the multi-channel dust collection method. Heat and Residue Recovery with Heat Exchanger Residue is used as material and heat is reused as combustion and secondary air to reduce fuel consumption, thereby improving economics and contributing to the prevention of warming.

     The process of 106-850 μm glass bead production shaft kilns uses large amounts of thermal energy in raw material collection ⇒ grinding sorting ⇒ molding firing ⇒ sorting packaging ⇒ bulk loading and molding firing processes to reduce waste energy improvements.

Shaft kiln structure: main body ⇒ expansion amplification chamber ⇒ final collection device, separate raw material supply device, fuel supply device, supply / exhaust blower, duct, and subsequent sorting packing device. And secondary air.

Currently used devices produce 2.80kg Bead, burning 1kg LPG,

Improved productivity with more than 5.1 kg of heat recovery and heat recovery.

Heat recovery:

      1. Heat recovery of the body,

      2. The heat collected by exhaust is collected first, and the heat dissipation in the expansion chamber is collected.

      3. To develop and install gas venturi burners of the structure in which gas is sucked by high pressure blowing to use high temperature air for combustion.

※ Existing equipment also recovers and uses heat at 200 ℃ from the exhaust, but when the device is developed, it estimates 600 ℃ of heat energy.

If you plan heat recovery through demonstration,

Body dimensions: Diameter 800Ø ", cross section 0.50 ㎡, Height 5 m, Heat transfer area 9.00 ㎡,

Amplifier room: diameter 2,80mØ "height 6.00m,

Temperature: Losim 1,100 ℃, Amplification Chamber 400 ~ 700 ℃

Required air flow rate: Estimated air flow rate of upstream firing part 8 ~ 9m / sec, actually 30m / sec = volume area x wind speed x time = 0.5 x 8 ~ 9 x 3,600 = 16,000CMH,

Heating amount: Air supply, specific heat 0.288kcal / ㎥ ℃

Heated to 200 ℃ with waste heat before blowing the inlet = 900 ℃

Cullet = 1,200 kg / hr, Specific Heat = 0.21 kcal / kg ° C,

Loss of interstitial wind, the air before blowing is 0 ℃,

Supply calories: 1,100 x 16,000 x 0.288 = 5,068,800 kcal / hr,

Cullet heating: 1,200 x 0.21 x 900 = 226,800 kcal / hr,

Interstitial wind and others: 204,400kcal / hr (3.86%)

Total: 5,500,000 kcal / hr,

Supply 200 ℃ exhaust heat of existing equipment as secondary air, 200 x 16,000 x 0.288 = 921,600 / 5,500,000 x 100 = 16.76% reduction, required heat = 4,578,400 kcal / hr,

Gas consumption, LPG low calorific value 13,000kcal / kg Efficiency 95%, 4,578,400 / 13,000 = 352.18kg / hr, 352.18 / 0.95 = 371kg / hr,

1. Estimated heat recovery of the body:

Perfusion Calorie: 1 / K = 1 / αο + ｔ / λ + 1 / αο = 1/200 + 0.0015 / 46 + 1/200 = 100kcal / ㎡hr ℃

LMTD: Roshim 1,100 ℃ to 700 ℃, 100 ℃ outside air 650 ℃ = 1,100-650 = 450,

700-100 = 600, Δm = 600-450 / ln (600/450) = 521

Heat dissipation = 521 x 100 x 9.00 = 468,900 kcal / hr, 470,000 kcal / hr

Air flow rate = 470,000 / (550 ℃ x 0.288) = 2,967CMH, 3,300CMH

2. Estimated calories of exhaust:

Body perfusion recovery calories 470,000kcal / hr,

Cullet heating loss 226,800kcal / hr,

Severe winds and other losses 204,400kcal / hr

Loss from Perfusion 825,000kcal / hr

Expansion room perfusion recovery 460,000kcal / hr

Total 2,186,200 kcal / hr,

5,500,000-2,186,200 = 3,313,800kcal / hr

Exhaust temperature = 3,313,800 / (16,000 x 0.288) = 719 ℃, final exhaust air 60 ℃, heat exchange with blown air, 719 ℃-578 ℃ = 129, 60 ℃-15 ℃ = 45, Δm = 79 60 = 659, 659 x 16,000 x 0.288 = 3,000,000 kcal / hr (approximate loss of 10% in plate heat exchangers)

When the outlet temperature of blown fresh air is 0 ° C outside and 18,000CMH is blown, 3,000,000 / 0.288 x 18.000CMH = 578 ° C,

Air flow = 21,300CMH, 33.12% more to prevent low temperature blowing between poles.

Plate heat exchanger: 3,000,000 / ((578 + outside condition) x heat flux x heat transfer area)

Secondary heating heat: As the lower part of the amplification chamber is a low temperature with rising air, it is used for dehumidification and heating of the Cullet, and the high temperature above the upper middle is used for secondary heating.

Estimated perfusion heat: 1 / K = 1 / αο + ｔ / λ + 1 / αο = 1/200 + 0.003 / 46 + 1/100 = 91kcal / ㎡hr ℃, 600 ℃ upper part of expansion chamber, 719 ℃ upper part of blowing Air 578 ° C Final heating air 650 ° C, Heat transfer area 124 m2, LMTD = 600-578 = 22, 719-650 = 69, Δm = 69-22 = ln (69/22 = 41

Perfusion heat from expansion room = 124 x 41 x 91 = 460,000kcal / hr,

If the heat transfer surface is insufficient, increase the perfusion value of Fin inside.

Number of arrays: 470,000 kcal / hr, primary

          2nd 3,000,000 + 460,000 = 3,460,000 kcal / hr

          Total 3,930,000kcalhr

Final temperature: 3,460,000 / 18,000 / 0.288 = 667 ° C Minimize losses 630 ° C Combustion and secondary air to be obtained, 16,000 x 0.288 x 630 = 2,900,000kcal / hr

Heat of combustion = 5,500,000-2,900,000 = 2,600,000kcal / hr

Gas volume when using LPG: 2,600,000 / (13,000 x 0.95) = 210kg

Fuel savings: 210/371 = 56.60%

productivity :

Existing Production Method: 1,040 / 371 = 2.80 / 1.00

Improved production method (5% capacity increase due to improved combustion capacity): 1,090 / 210 = 5.19 / 1.00

Glass beads of 106 ~ 850㎛ produced using shaft kilns are widely used in various industries. In particular, they are strategic materials that have no substitute for road lane coating reflective materials, but energy-consuming materials that consume large amounts of fuel gas in the production process.

The heat energy consumed by heat dissipation and arrangement is double layered in the main body and the amplification chamber wall, flowing fresh air into the gap, which is used as capture combustion and secondary air, suppressing heat dissipation to the outside, increasing exhaust temperature, and collecting remnant multi-cylinder cyclone dust collector The plate heat exchanger recovers more than 78% of the exhaust and percolating heat. This is 48.33% less than the existing production method. Recovering combustion and using it as secondary air. Gas combustion to use hot air even in combustion increases the temperature of Venturi Burner to the combustion air. Domestic 106 ~ 850㎛ glass bead demand is more than 25,000 tons / year, and most of them are imported from China, which uses underground LNG almost free of charge, but the introduction price was only 400,000 won / ton in 2006, which was only 250,000 won / ton. Is going beyond.

China also imposed a fee on LNG, which is free, and domestic production is economical due to a rise in the fee for use. Developing a device, creating a production base, creating jobs, and entering the world market, supplying energy-saving devices and preparations Savings will contribute to preventing global warming and generate profits for consumers and producers.

Representative Figure 1 is a control system diagram of a shaft kiln producing glass beads. The device configuration is a secondary air supply chamber, located below the shaft kiln, supplying secondary air to the main body, the upper part is the shaft kiln body, and the upright cylinder is connected to the secondary air supply chamber, the upper part is inserted inside the amplification chamber, Air layer for partial isolation. In the middle part, a plurality of burners are installed and a Culler inlet is installed on the upper part. An expansion amplification chamber is installed on the upper floor, and the upper part is connected to the plate heat exchanger with a hat lid, and the plate heat exchanger extrudes fresh air for cooling and heat recovery. It consists of three sets of blowers to extract the.
The after-treatment process follows the existing equipment.

The levitation of the shaft kiln is driven by hot air, which is divided into combustion and secondary air. Secondary air is supplied from (1-1) supply chamber, and combustion air sucks and burns fuel gas in Venturi type after air supplied from (05) blower gets high temperature from main body of double casing duct (01). Is supplied to a plurality of gas burners attached to the upper part of the main body, and the surplus portion is sent to the secondary air collecting chamber (1-1). The gas burner mixes and combusts the combustion gas sucked by the hot air to be pressurized to make the pullet injected from the upper part of the shaft kiln at an even temperature. (03) Part of the expansion chamber falls into a weakening of the airflow, and part of it continues to mix with the rising airflow. (10) Through the duct No. 10, heat is exchanged in the plate heat exchanger (04). The trapped and lowered exhaust is exhausted by the ventilator (07) through the duct (11). Fresh air is introduced into the plate heat exchanger by the (06) air blower (12) through the duct (12) to obtain the exhaust and heat exchange high temperature, and then through the duct (13) through the lower part of the expansion chamber (03). Discharges into the upper part of the double duct and changes to a higher temperature, and then is supplied from the secondary air supply chamber (1-1) through the duct (14) to the secondary air (01) to promote combustion. To float the mold. In this process, the Cullet is formed into glass beads and flows into the expansion chamber (03), and the airflow caused by the expansion is partly collected by the airflow, and the rest is raised by the updraft, through the upper (10) duct (03). Moving to plate heat exchanger During the heat exchange process, the flow rate is contracted due to the rapid decrease in temperature, and is collected through the outlet rotary valve at the bottom of the valve. Other post-processes abbreviate | omit description.

(01) double shaft kiln
(02) number of gas burners
(03) times amplification expansion room
(04) Plate plate counterflow heat exchanger
(05) high pressure blower
(06) high pressure blower for fresh air supply
(07) high pressure exhaust fan
(10) duct for expansion chamber exhaust
11 times exhaust duct
(12) air supply duct
(13) Intermediate duct for supplying air heated in (04) to (03)
(14) Ducts for supplying the last heated air to the secondary air supply chamber
(15) Supply fresh air to the burner shaft kiln wall.
(1-1) secondary air mixing supply chamber

Claims (5)

     The wall of the shaft kiln body that produces glass beads is used as a double layer, and the gap is used as a duct space. The heat energy that has been dissipated is collected, burned, and used as secondary air to save energy, and the wall is cooled. Energy recovery and wall cooling system      Double the shaft kiln body and the amplification chamber wall and use the gap as a duct to recover heat radiation. Energy saving device that uses heat lost by heat collection as secondary combustion air      The plate heat exchanger is used for the glass bead trapping method in the exhaust of glass beads collected by dust collectors such as cyclones to save energy by using the heat energy lost in the exhaust as capture combustion or secondary energy, and to recapture the remaining materials by rapid cooling of the process air. Energy savings and material collectors.      The energy saving device according to claim 3, wherein the heated fresh air is further heated by heat dissipation in the expansion chamber wall and the upper part to further reduce energy used for combustion or secondary air. Gas burners of the type 1,2,3,4 in which combustion gas is sucked and burned by using high pressure air Venturi to make high temperature combustion air.

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