CN110606646A - A harmless treatment system for oilfield sludge and its treatment process - Google Patents

Abstract

The embodiment of the invention discloses a harmless oilfield sludge treatment system and its treatment process, which belong to the technical field of oilfield sludge treatment. The technical scheme is as follows, including a rotary dryer, a rotary kiln, a secondary combustion chamber, and a quenching tower And flue gas treatment device, between the outlet end of the rotary dryer and the inlet end of the rotary kiln, there is a second belt conveyor and a large-inclination belt conveyor in sequence, and the blanking end of the large-inclination belt conveyor is at the inlet end of the rotary kiln Above, there is a chute at the outlet of the rotary kiln. There is a gas pipeline connected between the rotary kiln and the secondary combustion chamber. There is a return air pipeline connected between the rotary dryer and the gas pipeline. There is a smoke outlet channel connected between the fan, the secondary combustion chamber and the quench tower, and a smoke pipeline is provided between the outlet end of the quench tower and the flue gas treatment device, which solves the problem of existing oilfield sludge treatment. Oilfield sludge treatment is not clean, not thorough, and the process is relatively complicated.

Description

A harmless treatment system for oilfield sludge and its treatment process

technical field

The embodiments of the present invention relate to the technical field of oilfield sludge treatment, in particular to a harmless oilfield sludge treatment system and a treatment process thereof.

Background technique

Now there are various technologies for treating oily sludge, and each method has its own advantages and disadvantages and scope of application. At present, the commonly used sludge treatment technologies at home and abroad include: biological technology, sludge profile control technology, solvent extraction technology, thermochemical Washing technology, pyrolysis treatment technology, etc.

There are certain disadvantages in using these technologies to treat oily sludge. For example, solvent extraction can recover most of the oil resources in oily sludge, but at the same time, there are disadvantages such as long process, complicated process, and high treatment costs; using biological treatment to treat oily sludge Although there is no secondary pollution during the sludge process, the treatment period is long; the chemical demulsification method needs to add a demulsifier and heating to the heavily emulsified oil sludge, and it is also difficult to treat crude oil; the solid-liquid separation method is suitable for oily sludge with high oil content and serious pollution. The recovery rate is low.

When using these existing methods to treat oily sludge, there are various disadvantages, so it is difficult to quickly and comprehensively treat oily sludge.

Contents of the invention

For this reason, the embodiment of the present invention provides a harmless oilfield sludge treatment system and its treatment process to solve the problem of unclean and incomplete treatment of oilfield sludge in the existing treatment of oilfield sludge, and the process relatively complex issue.

In order to achieve the above purpose, embodiments of the present invention provide the following technical solutions:

According to the first aspect of the embodiment of the present invention, a harmless oilfield sludge treatment system includes a rotary dryer, a rotary kiln, a secondary combustion chamber, a quenching tower, and a flue gas treatment device. The rotary dryer Between the outlet end of the machine and the inlet end of the rotary kiln, a second belt conveyor and a large-inclination belt conveyor are arranged in sequence, and the upper blanking end of the large-inclination belt conveyor is above the inlet end of the rotary kiln, and the rotary kiln A chute is provided at the outlet end of the rotary kiln, a gas pipeline is connected between the rotary kiln and the secondary combustion chamber, and a return air pipeline is connected between the rotary dryer and the gas pipeline, and the return air pipeline is provided with There is a circulating fan, a smoke outlet channel is connected between the secondary combustion chamber and the quench tower, and a smoke pipeline is provided between the outlet end of the quench tower and the flue gas treatment device.

Further, the smoke outlet channel of the secondary combustion chamber is provided with a hot air outlet pipe for the rotary dryer, and the hot air outlet pipe is connected to the rotary dryer.

Further, one side of the rotary dryer is provided with a first belt conveyor, and the discharge end of the first belt conveyor is connected to the inlet end of the rotary dryer.

Further, one side of the rotary kiln is provided with a cooler, the lower end of the chute communicates with the feed end of the cooler, the discharge end of the cooler is provided with a chain bucket conveyor, and the chain bucket conveyor The feed end is below the discharge end of the cooler.

Further, the flue gas treatment device includes a desulfurization tower, a bag filter and a lye adsorption tower arranged in sequence, the smoke pipeline is connected to the inlet end of the desulfurization tower, and the outlet end of the desulfurization tower is connected to A first flue gas pipeline is connected between the inlet ends of the bag filter, and a second flue gas pipeline is connected between the outlet end of the bag filter and the inlet end of the lye adsorption tower.

A process for harmless treatment of oilfield sludge according to the second aspect of an embodiment of the present invention, comprising the following steps,

S1, placing an appropriate amount of oilfield sludge on the first belt conveyor, so that the oilfield sludge is transported to the rotary dryer through the first belt conveyor;

S2, using the rotary dryer to heat and dry the oilfield sludge, and at the same time, the flue gas generated by the gas combustion in the secondary combustion chamber is transported to the rotary dryer through the hot air outlet pipe;

S3, output the sludge treated in the rotary dryer to the second belt conveyor, and transport the sludge to the rotary kiln through the second belt conveyor and the large-inclination belt conveyor, and turn on the circulation fan at the same time to The gas generated on the rotary dryer is input into the secondary combustion chamber through the intake channel for full combustion;

S4, the oilfield sludge transported to the rotary kiln in step S3 is incinerated in the rotary kiln, and the waste gas generated by heating the oilfield sludge in the rotary kiln is input into the secondary combustion chamber through the gas pipeline to burn

S5, transporting the treated oilfield sludge and the ash formed in step S4 to the cooling machine through the chute for cooling treatment;

S6, the ash after cooling in step S5 is transported to the chain bucket conveyor, and transported to a designated position by the chain bucket conveyor for recycling.

Further, the temperature for heating the oilfield sludge in the rotary dryer in step S2 is 500-600°C.

Further, in step S4, the oilfield sludge in the rotary kiln is burned at a temperature higher than 1100°C.

The embodiment of the present invention has the following advantages: when the oilfield sludge is processed in the rotary dryer, the Some of the waste gas is pyrolyzed, and then when the oilfield sludge is transported to the rotary kiln for incineration, the harmful and toxic substances in it can be calcined to clean up these harmful substances, and then the rotary drying furnace and the rotary kiln The waste gas and toxic gas are transported to the secondary combustion chamber for combustion treatment to clean up the heat exchange waste gas of toxic gas in the flue gas, and then transport it to the quench tower for cooling treatment, and finally transport it to the flue gas treatment The device further processes and discharges it. Using this method, the oilfield sludge can be quickly and fully treated, so that the treatment of the oilfield sludge is relatively thorough. At the same time, some harmful gases in it are processed by calcination to make the discharged gas Relatively clean.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that are required in the description of the embodiments or the prior art. Apparently, the drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings according to the provided drawings without creative work.

The structures, proportions, sizes, etc. shown in this manual are only used to cooperate with the content disclosed in the manual, so that people familiar with this technology can understand and read, and are not used to limit the conditions for the implementation of the present invention, so there is no technical In the substantive meaning above, any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope of the technical content disclosed in the present invention without affecting the functions and objectives of the present invention. within the range that can be covered.

Fig. 1 is a schematic diagram of the system structure of the oilfield sludge harmless treatment system provided in Example 1 of the present invention.

In the figure: 1. Rotary dryer; 2. Rotary kiln; 21. Chute; 3. Secondary combustion chamber; 4. Quenching tower; 5. First belt conveyor; 51. Second belt conveyor; 52. Large Inclined belt conveyor; 6. Chain bucket conveyor; 7. Gas pipeline; 8. Hot air outlet pipeline; 9. Return air pipeline; 10. Circulating fan; 11. Smoke outlet channel; 12. Smoke pipeline; 13. Cooling 14. Desulfurization tower; 15. Bag filter; 16. Alkaline adsorption tower; 17. First flue gas pipeline; 18. Second flue gas pipeline.

Detailed ways

The implementation mode of the present invention is illustrated by specific specific examples below, and those who are familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this description. Obviously, the described embodiments are a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

A harmless treatment system for oilfield sludge, as shown in Figure 1, includes a rotary dryer 1, a rotary kiln 2, a secondary combustion chamber 3, a quench tower 4 and a flue gas treatment device, wherein the rotary dryer 1 Between the outlet end of the rotary kiln 2 and the inlet end of the rotary kiln 2, a second belt conveyor 51 and a large-inclination belt conveyor are arranged in sequence, and the materials discharged from the outlet end of the rotary dryer 1 can drop onto the second belt conveyor 51 In addition, the material on the second belt conveyor 51 can be transported to the feeding end of the large-inclination belt conveyor 52, the upper blanking end of the large-inclination belt conveyor 52 is above the inlet end of the rotary kiln 2, and the outlet of the rotary kiln 2 A chute 21 is fixedly connected at the end; in addition, a first belt conveyor 5 is arranged on one side of the rotary dryer 1 , and the discharge end of the first belt conveyor 5 is connected with the inlet end of the rotary dryer 1 .

When treating oilfield sludge, the first belt conveyor 5 can be used to transport the oilfield sludge to the rotary dryer 1, so that the rotary dryer 1 can be used to heat and dry the sludge, and the heating temperature is 500 -600°C, because the oilfield sludge will be pyrolyzed when the drying temperature exceeds 350°C, some combustible gases and other waste gases will be produced during pyrolysis; after drying, the oilfield sludge will be discharged from the rotary dryer 1 The outlet end is discharged and falls on the second belt conveyor, and then the oilfield sludge can be transported to the rotary kiln 2 by using the large-inclination belt conveyor, and further incinerated in the rotary kiln 2, and the incineration temperature is kept at 1100°C, so that A variety of toxic and harmful substances in oilfield sludge are oxidized and pyrolyzed at high temperature, turning the sludge into small, non-toxic and stable ash; then the ash formed in the rotary kiln 2 will be discharged through the chute 21.

As shown in Figure 1, a cooler 13 is provided on one side of the rotary kiln 2, the lower end of the chute 21 communicates with the feed end of the cooler 13, and a chain bucket conveyor 6 is provided at the discharge end of the cooler 13, and The feed end of the chain bucket conveyor 6 is below the discharge end of the cooler 13, so that after the oilfield sludge is incinerated in the rotary kiln 2, the waste in it can be cooled through the cooler 13, and then cooled The waste materials will fall onto the chain bucket conveyor 6, thereby utilizing the chain bucket conveyor 6 to transport the waste materials to the designated position for processing.

The gas transmission pipeline 7 is connected between the rotary kiln 2 and the secondary combustion chamber 3, and the return air pipeline 9 is connected between the rotary dryer 1 and the gas transmission pipeline 7, and a circulating fan 10 is arranged on the return air pipeline 9, A smoke outlet channel 11 is communicated between the secondary combustion chamber 3 and the quench tower 4, and a smoke delivery channel is provided between the quench tower 4 and the flue gas treatment device.

During the drying process of the oilfield sludge into the rotary dryer 1, a certain amount of waste gas will be produced, and the waste gas in the rotary dryer 1 can be transported to the secondary combustion chamber 3 by the return air duct 9 for sufficient combustion , to dispose of the waste gas therein, and at the same time, the waste gas therein is conveniently transported to the secondary combustion chamber 3 through the circulating fan 10; at the same time, certain harmful Gas, through the kiln tail smoke chamber and gas pipeline 7, these harmful gases can be transported to the secondary combustion chamber 3 for high-temperature calcination to eliminate harmful gases in the flue gas. Then the flue gas from the secondary combustion chamber enters the quench tower 4 through the flue outlet channel 11 for cooling treatment, and then enters the flue gas treatment device through the flue delivery duct for other treatments.

On the smoke outlet channel 11 of the secondary combustion chamber 3, there is a hot air outlet pipe 8 provided for the rotary dryer 1, and the hot air outlet pipe 8 is connected to the rotary dryer 1, so that the combustion air in the secondary combustion chamber 3 can be utilized. The generated flue gas is transported to the rotary dryer 1 through the hot air outlet pipe 8, through which the high-temperature flue gas can heat the oilfield sludge in the rotary dryer 1, thus reducing the hot air in the rotary dryer 1 system. Furnace equipment investment and fuel consumption save a certain amount of energy.

In addition, the secondary combustion chamber 3 is provided with a gas input port and an air supply port, which can ensure that the waste gas and other gases charged into the secondary combustion chamber 3 can be fully combusted.

As shown in Figure 1, the flue gas treatment device includes a desulfurization tower 14, a bag filter 15 and an alkali adsorption tower 16 arranged in sequence, wherein the flue gas pipeline 12 is connected to the inlet end of the desulfurization tower 14, and at the outlet of the desulfurization tower 14 A first flue gas pipe 17 is connected between the bag filter 15 and the inlet end of the dust collector, and a second flue gas pipe 18 is connected between the outlet end of the bag filter 15 and the inlet end of the lye adsorption tower 16 . After the cooled flue gas enters the desulfurization tower 14 through the flue gas pipeline 12, it can be desulfurized, and then it enters the dust collector to remove the dust therein, and finally it enters the Nitrogen oxides are treated in the alkali liquor adsorption tower 16 to achieve the purpose of discharging clean gas.

Example 2

A process for the harmless treatment of oilfield sludge, comprising the following steps,

S1, placing an appropriate amount of oilfield sludge on the first belt conveyor, so that the oilfield sludge is transported to the rotary dryer 1 through the first belt conveyor 5;

S2, use the rotary dryer 1 to heat and dry the oilfield sludge, and at the same time transport the flue gas generated by the gas combustion in the secondary combustion chamber 3 to the rotary dryer 1 through the hot air outlet pipe 8;

S3, output the sludge treated in the rotary dryer 1 to the second belt conveyor 51, and transport the sludge to the rotary kiln 2 through the second belt conveyor 51 and the large-inclination belt conveyor 52, and at the same time Turn on the circulation fan 10 to input the gas generated on the rotary dryer 1 into the secondary combustion chamber 3 through the air intake passage for full combustion;

S4, the oil field sludge transported to the rotary kiln 2 in step S3 is incinerated in the rotary kiln 2, and the waste gas generated by heating the oil field sludge in the rotary kiln 2 is input to the second through the gas transmission pipeline 7 Combustion is carried out in secondary combustion chamber 3;

S5, transporting the oilfield sludge treated in step S4 and the formed ash through the chute 21 to the cooling machine 13 for cooling treatment;

S6, the ash after cooling in step S5 is transported to the chain bucket conveyor 6, and transported to a designated position by the chain bucket conveyor 6 for recycling.

Wherein in step S2, the temperature for heating the oilfield sludge in the rotary dryer 1 is 500-600°C, and after the temperature in the rotary dryer 1 reaches this temperature, it is convenient to remove the oilfield sludge in the rotary dryer 1. In addition, because the oilfield sludge will be pyrolyzed when the drying temperature exceeds 350°C, some combustible gases and other waste gases will be produced during pyrolysis, which is convenient for the waste gas to be pyrolyzed and transported to the secondary Combustion takes place in combustion chamber 3.

In step S4, the oilfield sludge in the rotary kiln 2 is burned at a temperature higher than 1100°C. When the combustion temperature in the rotary kiln 2 is higher than this temperature, various toxic and harmful substances in the oilfield sludge can be fully eliminated. Oxidation and pyrolysis at high temperature make the sludge into a small, non-toxic and stable ash, so that the harmful substances in the sludge are cleaned.

The present invention is arranged through the rotary dryer 1, the rotary kiln 2, the secondary combustion chamber 3, the quick cooling tower 4 and the flue gas treatment device, etc., when the oilfield sludge is processed in the rotary dryer 1, the Some waste gas is pyrolyzed, and then when the oilfield sludge is transported to the rotary kiln 2 for incineration, the harmful and toxic substances in it can be calcined to clean up these harmful substances. At the same time, the rotary drying furnace and the rotary kiln 2 The waste gas and toxic gas in the flue gas are transported to the secondary combustion chamber 3 for combustion treatment to clean up the heat exchange waste gas of the toxic gas in the flue gas, then transport it to the quench tower 4 for cooling treatment, and finally transport it to The flue gas treatment device further treats and discharges it. In this way, the oilfield sludge can be quickly and fully treated, so that the oilfield sludge can be treated more thoroughly. At the same time, some harmful gases in it can be processed by calcination, so that The exhaust gas is relatively clean.

Although the present invention has been described in detail with general descriptions and specific examples above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Claims (8)

1. A harmless treatment system for oilfield sludge, characterized in that it comprises a rotary dryer, a rotary kiln, a secondary combustion chamber, a quench tower and a flue gas treatment device, the outlet end of the rotary dryer is connected to the rotary A second belt conveyor and a large-inclination belt conveyor are sequentially arranged between the entrance ends of the kiln, and the upper blanking end of the large-inclination belt conveyor is above the entrance end of the rotary kiln, and the outlet end of the rotary kiln is provided with The chute, the rotary kiln and the secondary combustion chamber are connected with a gas pipeline, the rotary dryer and the gas pipeline are connected with a return air pipeline, and a circulating fan is installed on the return air pipeline. A smoke outlet channel is communicated between the secondary combustion chamber and the quench tower, and a smoke pipeline is provided between the outlet end of the quench tower and the flue gas treatment device. 2. A kind of harmless treatment system for oilfield sludge according to claim 1, characterized in that: the smoke outlet channel of the secondary combustion chamber is provided with a hot air outlet pipe for the rotary dryer, and the hot air The outlet pipe is connected to the rotary dryer. 3. A kind of oilfield sludge harmless treatment system according to claim 1, characterized in that: a first belt conveyor is arranged on one side of the rotary dryer, and the output of the first belt conveyor The end is connected with the inlet end of the rotary dryer. 4. A harmless treatment system for oilfield sludge according to claim 1, characterized in that: one side of the rotary kiln is provided with a cooler, and the lower end of the chute communicates with the feed end of the cooler, The discharge end of the cooler is provided with a chain bucket conveyor, and the feed end of the chain bucket conveyor is below the discharge end of the cooler. 5. A kind of oilfield sludge harmless treatment system according to claim 1, characterized in that: the flue gas treatment device includes a desulfurization tower, a bag filter and an alkali adsorption tower arranged in sequence, and the transport The flue gas pipeline is connected to the inlet of the desulfurization tower, and the first flue gas pipeline is connected between the outlet of the desulfurization tower and the inlet of the dust collector, and the outlet of the bag dust collector is connected to the inlet of the lye adsorption tower. A second flue gas pipeline is connected between them. 6. A process for harmless treatment of oilfield sludge, characterized in that it comprises the following steps, S1, placing an appropriate amount of oilfield sludge on the first belt conveyor, so that the oilfield sludge is transported to the rotary dryer through the first belt conveyor; S2, using the rotary dryer to heat and dry the oilfield sludge, and at the same time, the flue gas generated by the gas combustion in the secondary combustion chamber is transported to the rotary dryer through the hot air outlet pipe; S3, output the sludge treated in the rotary dryer to the second belt conveyor, and transport the sludge to the rotary kiln through the second belt conveyor and the large-inclination belt conveyor, and turn on the circulation fan at the same time to The gas generated on the rotary dryer is input into the secondary combustion chamber through the intake channel for full combustion; S4, the oilfield sludge transported to the rotary kiln in step S3 is incinerated in the rotary kiln, and the waste gas generated by heating the oilfield sludge in the rotary kiln is input into the secondary combustion chamber through the gas pipeline to burn S5, transporting the treated oilfield sludge and the ash formed in step S4 to the cooling machine through the chute for cooling treatment; S6, the ash after cooling in step S5 is transported to the chain bucket conveyor, and transported to a designated position by the chain bucket conveyor for recycling. 7. A harmless oilfield sludge treatment process according to claim 6, characterized in that: in step S2, the temperature for heating the oilfield sludge in the rotary dryer is 500-600°C. 8. A harmless oilfield sludge treatment process according to claim 6, characterized in that: in step S4, the oilfield sludge in the rotary kiln is burned at a temperature higher than 1100°C.