【Q&A Question 019】2017.01.19
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This post was last edited by 955559 on 2017-7-21 at 12:49. [Q&A Question No. 019] January 19, 2017: What are the reasons why the temperature at the outlet of the heating furnace cannot be increased? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) 1. Low gas pressure. 2. Partial blockage of the flame arrester 3. Coking and blockage of the nozzles in the burner section 4. Inappropriate opening degree of the flue dampers 5. Blockage of control valves due to debris 6. Overload of the heating furnace. Summary thread of Q&A questions for 2017 (updates ongoing): http://bbs.hcbbs.com/thread-1657793-1-1.html Summary thread of daily questions for 2017 (updates ongoing): http://bbs.hcbbs.com/thread-1657794-1-1.html Summary thread of Q&A questions for 2016 (already updated): http://bbs.hcbbs.com/thread-1597792-1-1.html New Normal Cup – 2016 HaiChuan Top 10 Selection – Please recommend candidates: http://bbs.hcbbs.com/thread-1654112-1-1.html Third phase of the HaiChuan Outstanding Management Members selection contest: http://bbs.hcbbs.com/thread-1655902-1-1.html “Creative Ideas for Energy Saving” campaign in the petrochemical sector: http://bbs.hcbbs.com/thread-1666758-1-1.html Xiaomi phones available for grabs. Thread for collecting chemical industry technical materials in the Petrochemical Section: http://bbs.hcbbs.com/thread-1654603-1-1.html Many prizes waiting for you (Source: HaiChuan Chemical Forum)
(1) The control valve, orifice plate, or filter is clogged. (2) The flue damper opening is too large. (3) Incomplete combustion. (4) The heating furnace is overloaded. (5) Coking or extinguishment of individual burners
(1) The control valve, orifice plate, or filter is clogged. (2) The flue damper opening is too large. (3) Incomplete combustion. (4) The heating furnace is overloaded. (5) Coking or extinguishment of individual burners
(1) The control valve, orifice plate, or filter is clogged. (2) The flue damper opening is too large. (3) Incomplete combustion. (4) The heating furnace is overloaded.
①The hydrogen content in the fuel gas is too high; efforts should be made to change its composition. ②The fuel gas pressure is low; increase the fuel gas pressure. ③If the fuel gas contains water or steam leaks in, enhance dehydration, inspect the heater, and carry out repairs. ④The nozzle orifice is blocked; check and clean it. ⑤The fuel gas flame arrester was clogged; switch to another set of flame arresters and clean the clogged one. ⑥If the fuel gas control valve is faulty or clogged, operate via the bypass line and inspect the control valve. ⑦If the flue damper is opened too wide, heat loss increases, the excess air coefficient rises, and the temperature at the flue gas outlet becomes too high; it is necessary to close the flue damper slightly to reduce the amount of air entering the furnace. ? ⑧ Incomplete combustion results in black smoke coming from the chimney; adjust the amount of air supplied to the furnace and the opening degree of the flue dampers to ensure complete combustion. ⑨The large feed rate to the heating furnace causes overload; reduce the load on the heating furnace. ? ⑩ When the flame in the heating furnace goes out, close the fuel gas valve, purge the furnace chamber, and restart ignition according to the ignition procedure.
1. Blockage of the control valve, orifice plate, or filter. 2. Excessive opening of the flue dampers. 3. Incomplete combustion. 4. Overload of the furnace. 5. Coking or extinguishment in certain burners
1. Low gas pressure. 2. Partial blockage of the flame arrester. 3. Coking and blockage of the nozzles in the burner section. 4. Inappropriate opening degree of the flue dampers. 5. Blockage of the control valves by debris. 6. Overload of the heating furnace.
The processing load is high, the furnace reaches its maximum capacity; the calorific value of the gas is low, and the fuel contains water and liquids, resulting in incomplete combustion!
Low fuel calorific value, incomplete combustion, low oxygen content, low negative pressure, high flue gas temperature, large heat losses in the furnace, large amount of raw material or low temperature
①The hydrogen content in the fuel gas is too high； ②Low fuel gas pressure ； ③Fuel gas contains water or steam leaks in ； ④Clogged nozzle orifice ； ⑤Fuel gas flame arrester clogged ； ⑥Fault or blockage of the fuel gas control valve ； ⑦The flue damper is opened too wide, resulting in high heat loss; the excess air coefficient is high, and the exhaust gas temperature is too high ； ⑧Incomplete combustion ； ⑨The heating furnace is overloaded due to excessive feed volume ； ⑩The fire in the heating furnace went out.
Changes in fuel gas composition, liquid presence in the fuel gas, faulty outlet temperature instruments, increased feed volume, etc