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External oil hot blast furnace

External oil hot blast furnace

Application:

for cement, chemical industry, metallurgy-supporting coal mill, raw material mill (cement), cement mill, dryer etc.;

Working principle:

YR series hot air furnace (Patent No.200420016992.9) consists of fuel supply device, air supply device, combustion device, combustion chamber and thermal control system. All steel structure furnace combustion chamber furnace wall is composed of multiple different angle of steel umbrella ring set, there is a certain gap between each ring, the furnace outer wall is made of steel cylinder, the outer wall and combustion chamber furnace wall formed between a ring channel, the cold air enter through the ring channel, from the gap between the ring umbrella into the furnace mixes with the high temperature flue gas . The steel umbrella ring of the furnace inner wall is made of different steel based on the working temperature.

Main Performance and features

★Reasonable Structure: full steel structure, with low energy consumption, low wear, light weight, small volume, short installation period, investment saving, simple maintenance, mobile and so on;

★ Easy to Use: all steel structure without refractory brick lining, no need preheating before starting the furnace, it can meet the heating requirements when switch-on, stop the furnace rapid cooling, without emergency chimney;

★ wide adaptability: combustible diesel oil, heavy oil, residual oil etc.;

★ High thermal efficiency: high efficiency atomization fuel nozzle, multiple air supply, combustion efficiency is higher than 99%; self-cooling and thermal insulation design, the furnace body outer wall temperature is low, and the thermal efficiency is more than 98%;

★ heating stability: the heating temperature is 100-1200℃ adjustable; the hot blast furnace load adjustment is flexible, can be controlled by fully automatic, manual way.

Detail

PLC controlling system:

The state mark of the normal operation of the fuel oil hot air furnace is the reasonable ratio of the fuel quantity and the drum air volume, which makes the furnace temperature, outlet flue gas temperature and exhaust gas temperature keep within a certain range to dry the materials . In different process occasions, the measurement and control parameters is different.

The control system can be used in the manual or automatic method, and the automatic functions are as follows:

⑴. Automatic purge (front purge, rear purge), program ignition, flame out automatic protection;

⑵. Over temperature alarm and protection;

⑶. External fault alarm and protection;

⑷. Automatic adjustment of oil volume and combustion air volume;

⑸.The touch screen centrally displays the process parameters such as temperature, pressure, valve position and flow rate, as well as controlling the start-stop and switch functions of each process equipment to monitor the operation status of each process equipment;

⑹. Manual / automatic switching function.

According to the need of the central control DCS system, the PLC system can communicate with the DCS system; The communication modes include Ethernet, Profibus DP, Profinet, Modbus RTU, Modbus TCP and point-to-point etc. That is, the PLC control system can exchange data with the central control DCS system through the above communication methods, so as to realize the remote control of the DCS system to furnace on site.

Electrical flow chart:

Measurement and control process parameters of fuel oil hot air furnace:

No.	Item	Code	Normal working range	measurement range	measurement and control instruments
1	Furnace box temperature	T1	600—1000℃	0—1200℃	Touch screen, thermocouple
2	hot air temperature at outlet	T2	100—1000℃	0—1200℃	Touch screen, Thermal resistance, thermocouple
3	Load regulation signal		By the process	By the process	Touch screen
4	wind pressure	P1	3—7kPa	0—10kPa	Touch screen, pressure transmitter
5	Nagative pressure in furnace box	P2	-500—100Pa	-500- 500Pa	Touch screen, pressure transmitter
6	oil pressure	P3	0.4---1.2Mpa	0---4Mpa	Touch screen, pressure transmitter
7	Drum wind door valve position	Z1	0—100%	0—100%	Touch screen, electric actuator
8	Oil door valve position	Z2	0—100%	0—100%	Touch screen, electric actuator
9	Supporting air valve position	Z3	0—100%	0—100%	Touch screen, electric actuator
10	Oil flow	F	By the process	By the process	Touch screen, differential pressure transmitter, etc

Selection table:

Model	heating quantity (kcal/h)	Supporting power (Kw)
YR2	200×104	12.5
YR4	400×104	31.5
YR6	600×104	38.5
YR8	800×104	48
YR10	1000×104	58
YR12	1200×104	78
YR16	1600×104	78
YR20	2000×104	94