nc-7 operation unprotected

8/16/2019 NC-7 Operation Unprotected

1/10

REVISION: NCR350B-SM SINOMA

SERVICE INSTRUCTIONS

ON

NC-7 FOUR-CHANNEL KILN BURNER

WITH

CARRIAGE

NCR350B-SM

EXAM. & APPROVER

EXAM. & CHECKER

CORRECTOR

COMPILER

TOTAL VOLUMES ， VOLUMES RESUMED

PAGES OF THE VOLUME

SINOMA INTERNATIONAL ENGINEERING CO., LTD.

DATE: 2003.12


2/10


Contents

Preface………………………………………………………………………………… 1

1 Main technical performance…………………………………………………… 1

1.1 NC-7 four-channel kiln burner……………………………………………… 1

1.2 S2 oi l burner…………………………………………………………………… 1

1.3 Carriage…………………………………………………………………………… 1

2 Working principle and structure……………………………………………… 1

2.1 Working principle……………………………………………………………… 1

2.2 Structure………………………………………………………………………… 3

2.2.1 Structure of NC-7 four-channel ki ln burner……………………………… 4

2.2.2 Structure of S2 oi l burner…………………………………………………… 4

2.2.3 Structure of carriage………………………………………………………… 5

3 Operation requirements………………………………………………………… 5

3.1 Operation………………………………………………………………………… 5

3.1.1 Adjustment of flame shape………………………………………………… 5

3.1.2 Adjustment of kiln burner posit ion……………………………………… 5

3.1.3 Ki ln shutdown………………………………………………………………… 5

3.2 Ignition…………………………………………………………………………… 6

3.2.1 Ignit ion (normal state)……………………………………………………… 6

3.2.2 Ignit ion (hot state)…………………………………………………………… 6

3.2.3 Ignit ion by other methods…………………………………………………… 6

4 Check and maintenance………………………………………………………… 6


3/10


4.1 Check and maintenance of NC-7 four-channel kiln burner…………… 6

4.1.1 Check and maintenance during normal operation…………………… 6

4.1.2 Check and maintenance during kiln shutdown………………………… 6

4.1.3 Check and maintenance during kiln shutdown after the kiln long-term

running………………………………………………………………………………… 7

4.2 Check and maintenance of S2 oil burner………………………………… 7

4.3 Check and maintenance of carriage………………………………………… 7


4/10


Page 1

Preface

Kiln burner is the key part of combustion system and it affects the system production,

quality, heat consumption and environment. We have developed four-channel kiln burner

with great speed difference through model research and numerical simulation. Based ongreat speed difference and synclastic coflow principle, the kiln burner can allow us to

adjust the spurting speed and angle of coal, facilitate sufficient mixture of secondary air

and coal and make the temperature of coal rise rapidly to reach burning point and burn

rapidly under negative pressure formed in central area of it. Advantages of kiln burner

are as follows:

The amount of primary air is small. The designed amount of primary air accounts for

7.5% of calculated air amount.

Complete burning can be achieved because of the sufficient mixture of primary,

secondary air and coal. The heat consumption is lower during normal operation.

The flame shape can be adjusted freely to adapt the calcining of clinker inside the

kiln.

It has good adaptability to coal quality and it can be used to burn inferior coal.

1 Main technical performance

1.1 NC-7 four -channel kiln burn er

The amount of coal feeding of the kiln burner is 7000 kg/h.

The primary air designed approximately accounts for 7.5% of calculated air amount.

1.2 S2 oil burner

Light diesel oil is adopted.

Oil amount for burning is 1000 kg/h or so.

Oil pressure is within the range of 2.5 to 3.0 MPa.

1.3 Carriage

Moving speed: 2.74m/min

Adjustable angles for upward, downward, left and right are al l up to 2°.

2 Working principle and structure

2.1 Working prin cipl e


5/10


Page 2

NC-7 four-channel kiln burner is as shown in figure 1. The primary air is divided into

three air flows which enter outer air channel, inner air channel and central air channel

respectively after entering air tube (Part No.3). Coal conveying channel is between inner

and outer air channels. Swirl vane (Part No.11) mounted at the nozzle of inner air can

make the air spurt spirally. Outer air flow, inner air flow and central air flow are spurting

axially. Coal having spurted is mixed sufficiently with the primary and secondary air and

burns. Manual butterfly valves (Part No.4) with opening indicators are supplied on inner

air tube and outer air tube respectively. The proportion of inner and outer air could be

adjusted through changing the opening and at the same time the spurting speed of air

flow is also changed. The ball valve supplied on central air connecting tube (Part No.2)

is used to adjust the central air amount. The outer air and central air spurt axially from

the holes arranged in a circle at each nozzle.

The kiln burner (Part No.12) is suspended by carriage (Part No.13) which is moving

forwards and backwards on the corresponding rails (Part No.14).

S2 oil burner (Part No.15) for the first ignition is placed in central tube (Part No.1). The

high-pressure oil will make strong rotary movement when it passes the tangent groove

and swirl chamber and spurt through holes. Under centrifugal force the oil will be

pulverized.


6/10


Page 3

2.2 Structure

NC-7 four-channel kiln burner with carriage mainly consists of kiln burner, carriage and

rail, etc. As shown in figure 2.


7/10


Page 4

2.2.1 Struct ure of NC-7 fou r-channel kiln bur ner

NC-7 four-channel kiln burner mainly consists of four channels as shown in figure 1.

Channel 1 (Part No.1) is the passage of central air which spurts axially and has a plate

at the outlet on which holes are evenly distributed in a circle.

Channel 2 (Part No.5) is the passage of inner air which spurts spirally and there is a

swirl vane (Part No.11) on the outlet of nozzle.

Channel 3 (Part No.7) is the passage of coal.

Channel 4 (Part No.8) is the passage of outer air which spurts axially and has a plate at

the outlet on which holes are evenly distributed in a circle.

An inspection hole with cover is distributed at coal feeding point and the condit ion of

coal inlet would be in sight when opening the cover of inspection hole (Part No.9).

Special treatment of material at coal inlet and outlet must be carried out to avoid wear.

S2 oil burner (Part No.15) for ignition is placed in central tube (Part No.1).

The pressure of inner and outer air can be read from pressure gauge (Part No.6). The

front section of kiln burner (the section enters kiln hood and kiln outlet) should be

wrapped with tabular corundum castable (Part No.10).

2.2.2 Struct ure of S2 oil bur ner


8/10


Page 5

S2 oil burner has simple and compact structure, strong burning capability and small

noise and is convenient for operation.

2.2.3 Struct ure of carriage

Refer to service instructions on carriage for kiln burner (NCR165-SM-98) for structure ofcarriage.

3 Operation requirements

3.1 Operation

3.1.1 Adj ust ment of flame shape

The adjustment of flame shape can be realized by changing the ratio of inner and outer

air. The ratio of inner and outer air should be adjusted in the range of 70% to 30% of

primary air.

Short and wide flame could be obtained by increasing inner air and reducing the

corresponding outer air at the same time (that is under high spurting speed of swirl air).

The spurting speed of swirl air will be increased with the opening of butterfly valve of

inner air increased. On the contrary, the speed will be reduced.

Long and narrow flame could be obtained by increasing outer air and reducing the

corresponding inner air at the same time (that is under high spurting speed of axial air).

The spurting speed of axial air will be increased with the opening of butterfly valve ofouter air increased. On the contrary, the speed will be reduced.

Swirl air is advantageous to obtain stable flame and it not only can improve the mixture

of coal and the primary and secondary air, but also can ensure rapid and efficient

burning.

The adjustment of flame shape is not relative to the coal feeding.

Proper adjustment of central air might be carried out according to flame shape.

3.1.2 Adjust ment of ki ln burner posit ion

The adjustment of the relative position of kiln burner nozzle and kiln outlet end surface,

kiln manhole center (cross section) and kiln burner in the kiln as well as the swing all

could be achieved by carriage and adjustment installation.

Refer to service instruction on carriage for kiln burner (NCR165-SM-98) for detail.

3.1.3 Ki ln shutdo wn

First stop conveying coal with fan running another several minutes to blow out the coal

retained in tube. It is also necessary for the air fan to continue running several minutes

to cool the kiln burner slowly. The kiln burner could only be pulled out till the section of


9/10


Page 6

the kiln burner entering the kiln has been cooled to some extent.

3.2 Ignition

3.2.1 Ignit ion (normal state)

Use S2 oil burner to ignite coal. Light diesel oil is generally used.

First ignite oil burner. After stable flame of oil burner has got and the temperature inside

kiln outlet has risen to some extent, coal could only be spurted to the kiln with coal

amount increased gradually and with proper inner air conveyed till coal is ignited. When

the stable flame of coal is maintained for some time, stop supplying oil to oil burner.

Then supply coal and primary air according to normal operation of kiln.

Inner air is advantageous to obtain stable flame.

Too big outer air is possible to result in extinguishing of flame.

3.2.2 Ignit ion (hot state)

When the temperature of kiln lining is within the range of 800℃ to 1000℃, the coal

could be directly spurted to the kiln and the flame would be formed immediately. If the

temperature inside the kiln is too low, oil burner is still needed for ignition.

3.2.3 Ignit ion by other methods

The kiln burner can also be ignited by other methods, for example: filling in firewood for

ignition and cotton yarn immerging oil for ignition, etc.

4 Check and maintenance

4.1 Check and maintenance of NC-7 four -channel kiln burner

Operation misplay resulting from improper check and maintenance might increase repair

expense and prolong kiln shutdown. Therefore, regular check and maintenance is

absolutely necessary.

4.1.1 Check and maintenance during normal operation

a Check to see whether the flange connections of tubes are proper.

b Check to see whether the adjusting butterfly valve is free.

c Check to see whether the castable is falling off.

d Check to see whether the flame shape is abnormal.

4.1.2 Check and maintenance during ki ln shutdo wn

The kiln burner should be pulled out from kiln hood for check and maintenance during

kiln shutdown.


10/10


Page 7

Remove sundries in each air tube and replace or repair the damaged parts.

Check and clean the connecting pipelines of pressure gauge.

Check homocentricity of all tubes of kiln burner head.

Repair castable.

4.1.3 Check and maintenance during kiln shutdown after the kiln long-term running

If there is operation misplay or forecasting that the kiln burner will be damaged in the

future during kiln shutdown after the kiln long-term running, it is recommended that

another set of kiln burner should be provided to avoid production stopping during repair

and maintenance of the kiln burner.

4.2 Check and maintenance of S2 oil burner

The kiln burner head should emerge from the end surface of central tube to check holes

of oil nozzle to see whether there is any deformation or block and clean or replace in

time during kiln shutdown.

4.3 Check and maintenance of carriage

Refer to service instructions on carriage for kiln burner (NCR165-SM-98) for detail.

nc-7 operation unprotected

Documents