How to improve flue gas pollution of steam injection boiler in oil field?
As an oilfield steam injection boiler used in oilfield production, due to its large number, the total amount of flue gas emissions is large. The problems of excessive emissions of sulfur dioxide, nitrogen oxides and solid particles in the flue gas need to be solved urgently.
According to the current oil field steam injection boiler, through incomplete statistics, the flue gas emission of oilfield steam injection boiler is: the content of particulate matter is 250 ~ 520mg / m3; SO2 content 920 ~ 2800 mg / m3; NOx content is 340 ~ 670 mg / m3. The national emission standard of boiler air pollutants issued in May 2014 stipulates that the flue gas emission of oil-fired boiler is: the content of solid particles ≤ 30mg / m3; SO2 content ≤ 300 mg / m3; NOx content ≤ 250 mg / m3. It can be seen that the flue gas emission of oilfield steam injection boiler in oil field exceeds the standard seriously.
However, due to the fact that a considerable number of steam injection boilers are mobile boilers, there are many pollutants in the flue gas of boilers, and there is a certain amount of oil in the flue gas, so the conventional bag filter, electrostatic precipitator and large volume water film wet dust collector cannot be used.
Therefore, steam injection boiler China Sanjack company provides a skid mounted oil field steam injection boiler flue gas desulfurization and denitrification device in view of the above defects existing in the existing technology.
That is to say, the top of the flue gas-water heat exchanger on the skid seat is provided with an upper smoke inlet pipe, and the bottom of the flue gas-water heat exchanger is provided with a lower smoke pipe, the lower smoke pipe is connected with the alkali liquor box, the alkali liquor box is provided with the alkali liquor, and the bottom is provided with a conical ash collecting hopper; one side of the cyclone separator is connected with the alkali liquor box, and the other side is connected with the chimney through the curved smoke pipe and the centrifugal fan.
A spray pump is arranged on the skid and connected to the nozzle in the alkali liquor tank through the spray pipe.
A liquid return pipe is arranged at the bottom of the cyclone separator.
The smoke water heat exchanger comprises a heat exchange pipe, a shell, an elbow box insulation cover and a side insulation layer. A plurality of groups of heat exchange pipes are arranged in the shell, and the heat exchange pipes are connected through an elbow. The outside of the elbow is provided with an elbow box insulation cover, the outside of the shell is provided with a side insulation layer, and the water inlet and outlet are connected with the heat exchange pipe in the shell.
The spray nozzle sprays umbrella lye.
The following remarkable effects have been achieved：
1. The flue gas / water heat exchanger can effectively absorb the heat of flue gas, reduce the exhaust gas temperature, and improve the inlet water temperature of the steam injection boiler, so as to improve the overall thermal efficiency of the boiler;
2. The main harmful substances SO2, NOx and solid particles in the flue gas were effectively removed, which met the requirements of environmental protection;
3. Skid mounted structure, high degree of integration, small volume, convenient for lifting and transportation, small occupation area.
Skid base (1), Sewage pipe (2), water collecting tank (3), water diversion pipe (4), lower flue gas pipe (5), flue gas-water heat exchanger (6), upper flue gas inlet pipe (7), alkali liquor (8), conical ash collector (9), alkali liquor tank (10), cyclone separator (11), centrifugal fan (13), chimney (14), liquid return pipe (16)
Specific embodiments
The utility model is further described in combination with figure 1-3:
The technical scheme is that the skid
(1) is composed of a blowdown pipe
(2), a water collecting tank
(3), a water diversion pipe
(4), a lower smoke pipe
(5), a smoke water heat exchanger
(6), an upper smoke inlet pipe
(7), an alkali liquor tank
(10), a cyclone separator
(11), a centrifugal fan
(13), a chimney
(14) and an electric control cabinet
(15); An upper smoke inlet pipe
(7) is arranged at the top of the smoke water heat exchanger
(6), a lower smoke pipe
(5) is arranged at the bottom of the smoke water heat exchanger
(6), and is connected to the water collecting tank
(3) through the water diversion pipe
(4), and a sewage pipe
(2) is arranged at the lower part of the water collecting tank
(3); The lower smoke pipe
(5) is connected with the alkali liquor tank
(10), the alkali liquor tank
(10) is provided with an alkali liquor
(8), and the bottom is provided with a conical ash collecting hopper
(9); one side of the cyclone separator
(11) is connected with the alkali liquor tank
(10), and the other side is connected with the chimney
(14) through a curved smoke pipe
(12) and a centrifugal fan
(13). A spray pump
(17) is arranged on the skid
(1) and connected to the nozzle
(19) in the alkali liquor tank
(10) through the spray pipe
(18). A liquid return pipe
(16) is arranged at the bottom of the cyclone separator
In addition, The smoke water heat exchanger (6) comprises a heat exchange pipe (22), a shell (23), an elbow box insulation cover (24) and a side insulation layer (25). A plurality of groups of heat exchange pipes (22) are arranged in the shell (23), and the heat exchange pipes are connected through elbows. The outside of the elbow is provided with an elbow box insulation cover (24), the outside of the shell (23) is provided with a side insulation layer (25), and the water inlet (20) and water outlet (21) a heat exchange tube (22) connected in the housing (23); the nozzle (19) sprays umbrella lye.
