1. Overview

21st century is protection environment and save energy of century, especially in market system Xia, international Shang of crude supply increasingly tension, oil chemical enterprise to improve itself of competitiveness to in market competition in the invincible, first depends on device of technology advanced, and for we such built Yu Shang century 80 generation early of 2# aromatics joint device for, to reduced enterprise of production cost, a is to increased technology of efforts, makes device of production process and device of equipment has advanced Two Foundation management to keep up with advanced equipment; another is the rational use of energy, energy conservation, Synectics, tapping potentials, is to improve the competitiveness of our business and the most effective means of reducing energy consumption per unit.

2# hydrogenation of aromatics combination unit unit heater in the unit as a whole accounted for a significant proportion of energy consumption, exhaust temperature and oxygen content on the stove the stove's efficiency and high and low energy consumption played a decisive factor. Hydrogenation unit in operation of heating furnace there are 5 units, circulating heated hydrogen box furnace BA-101, respectively BA-102 and removal of pentane column reboiler heat of round BA-103 and fractionating column reboiler heat of round BA-104 and BA-105 of aviation kerosene column reboiler.

Since its completion, BA-101~BA-104, technical innovation, has made significant technological advances, but there is still a lot of problems. Its heating furnace for preheating combustion air did not take any measures directly into the furnace for combustion. Chimney flue gas after combustion into the atmosphere. Resulting in high exhaust gas temperature, furnace efficiency low defect, and thermal pollution to the environment.

As shown in table 1 to the furnace flue gas loss matrix.

Table 1 modified BA-101~BA-104 furnace flue gas loss summary

2, transformation

For our enterprises, additional heat recovery system in heating furnace for BA-101~BA-104 and lower theheating furnace flue gas temperature, improving the thermal efficiency of the heater is of practical significance.

In 2002, in order to reduce energy consumption, through investigation, hydrocracker BA-101~BA-104 flue gaswaste heat recovery Declaration, after investigation by higher authorities, using a heat pipe technology,and began to implement the project in 2003.

Heat pipe technology using 711 Research Institute of technology and design include:

1. heat recovery systems relating to equipment, connection systems and platform support;

2. heat recovery systems installed base of equipment;

3. electrical wiring;

4. automatic control instrument.

End of 2002 start ground-breaking construction, Foundation, and began filling in on January 8, 2003. Basisafter they were done, before the overhaul (June 16), some of the equipment, pipeline construction andinstallation. All equipment and piping installed during overhaul. Flue gas heat recovery system eventuallyvoted in October 2003.

Before you drive off by technical innovation and device with 711 on drums, with commissioning of the fan,together with the instrument, electrical open damper, 6 10 pneumatic butterfly valve gate movementsdebugged. Solve the problems and current fan Super quick throttle opening doesn't work, valve, pneumaticbutterfly valve-after countless questions. Confirm the interlocking with movement, through theinterlocking logic of amendments, the interlock test success.

So in flue gas waste heat recovery systems for the October 9 vote. After using, because a shutdown whiledriving, the system has been shut down at a time, then after the operation has been running ever since.

Third, the effects

1. the functioning of evaluation:

From the drum, fans and other equipment functioning, has stable operation and equipment, instrumentfailures not occurred. From an outage due to shutdown of situation, when a fan stopped the shipment, quickopen door, pneumatic butterfly valve 6 interlocking movements are correctly in place, interlock requirements consistent with the design.

From the perspective of functioning of air preheater and air preheating temperature from 20 c to 143 c,fume temperature dropped from 313 â„ƒ 141 c, have reached the ideal effect.

2. data comparison

After the air preheater used, we turn our stove moving data for statistical, list and compared to the airheater before using the data.

Table 2 air heater operation operation before the data (from April 19, 2002)

Table 3 air preheater used performance data (from November 19, 2002)

Table 4 air preheater before using heater evaluation data (August 2003)

Table 5 cast of air preheater heating furnace after use evaluation data (November 2003)

Data can be seen from the table above, after using heat pipe, thermal efficiency of the boiler weresignificantly increased. In the same load, consumes less fuel gas is also significantly reduced.

3. economic benefits

(Formerly the fuel M3/H-fuel M3/H) x density x fuel gas price x8000 hour

= (1423.7-1147) x1154x8000x1.25x10-3

= 3.193 million Yuan

4, summary

Heat pipe after the transformation, the stove's efficiency has been greatly improved. Heat pipe preheatingsystem in operation since practically the improved stove flue gas oxygen content on the high side. Currentburner and flue baffle opening of the air damper opening degree is very small, the problem is the fan'spower is too great, causing air volume is too large, so that oxygen does not fall. In order to solve thisproblem, we think the answer is to fan frequency conversion speed regulator on and by this way to reducethe power consumption of fan, and even lower oxygen content in flue gas and raise the thermal efficiency ofthe stove.