CN115029152A - Coal tar washing and purifying device and method - Google Patents

Abstract

The invention discloses a washing and purifying device and method for coal tar. A liquid outlet barrel is arranged in an upper shell of an oil-water intensive mixer of the coal tar washing and purifying device, a balance hole is formed in the position, close to the top end, of the liquid outlet barrel, a continuous phase liquid inlet pipe orifice is formed in the position, close to the top end, of the side wall of the upper shell, the balance hole is located above the continuous phase liquid inlet pipe orifice, and the continuous phase liquid inlet pipe orifice is communicated with a tar buffer tank; the filter element component is positioned in the lower shell; a dispersed phase liquid inlet pipe orifice on the side wall of the lower shell is connected with a reuse water buffer tank; the bottom of the lower shell is provided with a sewage discharge pipe orifice. The oil-water strong mixer strengthens the process that fluid is broken into small liquid drops and is rapidly dispersed in another liquid through the ingenious flow passage design and the reasonable design of the filter element structure; the oil-water separator enables suspended water drops in the oil-water mixture to be rapidly coalesced into large water drops, the oil-water separation process is remarkably accelerated, and the whole device realizes continuous and efficient washing and purification of coal tar in the device.

Description

Coal tar washing and purifying device and method

Technical Field

The invention relates to the technical field of raw oil pretreatment, in particular to a washing and purifying device and method for coal tar.

Background

The pretreatment of raw oil is a key link in oil product processing, and impurities such as salts in the raw oil are usually removed by water injection washing in the process, so that qualified raw oil is supplied for downstream. As an important intermediate product in the coking industry, coal tar can be further deeply processed into fuel oil or a chemical product with high added value, and water injection washing of the raw material before processing is a key process.

However, oil and water are hardly dissolved with each other, and how to enlarge an oil-water contact interface in a limited space is achieved, so that the mass transfer process of salts in an oil phase to water is enhanced, and the method is very important for the oil-water mixing process. In addition, the fraction of the coal tar is relatively wide, particularly the medium-low temperature coal tar, the layering of oil on water, a water layer and oil under water can occur after the coal tar is mixed with water and washed, an emulsification transition layer is formed, and the layering process is very slow.

At present, common methods for enhancing oil-water mixing include: mechanical agitation mixing, air-flow agitation mixing, impinging stream mixing, venturi mixing, and the like. However, these methods have the disadvantages of high energy consumption, difficulty in troubleshooting mechanical parts, high cost of gas phase purification, limited mixing scale, and the like. It is seen that there is a need for a liquid-liquid mixing apparatus and method that can break one of the liquids into small droplets and rapidly disperse the droplets in the other liquid, and that can achieve efficient mixing of the two liquids without introducing gas or motor assistance.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a coal tar washing and purifying device and a coal tar washing and purifying method.

The invention provides a washing and purifying device for coal tar, which comprises a reuse water buffer tank;

a tar buffer tank;

the oil-water strong mixer comprises an upper shell, a lower shell and a filter element component;

a liquid outlet tube orifice is arranged at the top end of the liquid outlet tube barrel, a balance hole is arranged at the position, close to the top end, of the liquid outlet tube barrel, a continuous phase liquid inlet tube orifice is arranged at the position, close to the top end, of the side wall of the upper shell, the balance hole is positioned above the continuous phase liquid inlet tube orifice, and the continuous phase liquid inlet tube orifice is communicated with the tar buffer tank through an oil inlet pump;

the upper shell and the lower shell are detachably connected, the filter element assembly is positioned in the lower shell, and the upper end of the filter element assembly is detachably connected with the lower end of the upper shell; the side wall of the lower shell is provided with a dispersed phase liquid inlet pipe orifice, and the dispersed phase liquid inlet pipe orifice is connected with a reuse water buffer tank through a water inlet pump; the bottom of the lower shell is provided with a sewage discharge pipe orifice.

Preferably, the device further comprises an oil-water separator, wherein the oil-water separator comprises a settling cylinder and a coalescer arranged in the settling cylinder; the liquid inlet end of the coalescer is connected with the liquid outlet pipe orifice of the oil-water strong mixer; the utility model discloses a sedimentation cylinder, including a sedimentation cylinder, a coalescer, a light oil connecting pipe, a water phase connecting pipe and a heavy oil connecting pipe, the setting cylinder level sets up, its one end is located to the coalescer, the other end of setting cylinder is equipped with light oil connecting pipe, water phase connecting pipe and heavy oil connecting pipe, just the top of setting cylinder is all located to light oil connecting pipe and water phase connecting pipe, and the bottom of setting cylinder is located to the heavy oil connecting pipe, the interior top of setting cylinder between light oil connecting pipe and the water phase connecting pipe still is equipped with the liquid barrier, and the bottom and the setting cylinder bottom of liquid barrier reserve the clearance.

Preferably, the side wall of the settling cylinder is further provided with a first-stage lower side liquid guide pipe orifice, a first-stage upper side liquid guide pipe orifice, a second-stage upper side liquid guide pipe orifice and a second-stage lower side liquid guide pipe orifice which are communicated with the internal liquid; the oil-water separator is communicated with a first-level remote transmission boundary level meter through a first-level lower side liquid guide pipe orifice and a first-level upper side liquid guide pipe orifice, and communicated with a second-level remote transmission boundary level meter through a second-level upper side liquid guide pipe orifice and a second-level lower side liquid guide pipe orifice.

Preferably, be equipped with into water flow control valve on the communicating pipe of disperse phase feed liquor mouth of pipe and intake pump, be equipped with oil feed flow control valve on the communicating pipe of continuous phase feed liquor mouth of pipe and intake pump, light oil takeover, aqueous phase takeover and heavy oil takeover are connected with the corresponding result collection storehouse respectively, and each connecting tube correspondence sets up light oil extraction valve, washing water extraction valve and heavy oil extraction valve.

Preferably, the outlet pipe orifice of the oil-water strong mixer is communicated with the bottom of the oil-water separator through two branch pipes connected in parallel, and the two branch pipes are respectively communicated with a feed valve a and a feed valve b; the oil-water separator is characterized in that the feed valve a and the feed valve b are respectively communicated with two branch pipelines communicated with the bottom of the oil-water separator and lead out two parallel liquid drainage branch pipelines, the two parallel liquid drainage branch pipelines are communicated with an inlet of the liquid-solid separator after being converged and communicated through a liquid drainage main pipeline, one outlet of the liquid-solid separator is communicated with an intermediate product oil sludge collection bin, the other outlet of the liquid-solid separator is communicated with an oil inlet pipeline of an oil inlet pump inlet through the liquid drainage main pipeline, and the two liquid drainage branch pipelines are respectively communicated with a backflushing valve a and a backflushing valve b.

Preferably, the oil-water separator is further connected with a safety valve, a discharge pipe orifice of the safety valve is communicated with a pipe orifice of related equipment at the top of the tar buffer tank through a pipeline, and the pipeline is provided with a slope, so that the discharge liquid flows into the tar buffer tank under the action of gravity.

Preferably, the coalescer comprises a feed pipe orifice, a coalescer head, a coalescer core, a distribution plate, a coalescer cylinder and a coalescer flange pair; the one end and the feed pipe mouth of a pipe of coalescer head are connected, and the other end passes through the coalescer flange to be connected with the coalescer barrel, the upper end of coalescer barrel and the bottom intercommunication of subsideing a section of thick bamboo, the entrance intercommunication distributing plate of coalescence core, the marginal seamless connection coalescer barrel inner wall of distributing plate, the feed pipe mouth is connected with the play liquid mouth of a pipe.

The invention also provides a purification method of the coal tar washing and purifying device, which comprises the following steps:

closing the backflushing valve b, the backflushing valve a, the heavy oil leading-out valve, the oil inlet flow regulating valve and the water inlet flow regulating valve, and simultaneously opening the feeding valve a, the feeding valve b, the light oil leading-out valve and the washing water leading-out valve;

starting a water inlet pump and an oil inlet pump, then adjusting the opening degrees of a water inlet flow regulating valve and a water inlet flow regulating valve, mixing two raw material liquids through an oil-water strong mixer, injecting the mixed raw material liquids into an oil-water separator, then controlling the opening degree of a light oil outlet valve according to the numerical change of a first-stage remote transmission interface level meter, and controlling the opening degrees of a washing water outlet valve and a heavy oil outlet valve according to the numerical change of a second-stage remote transmission interface level meter;

after the device runs for a preset period of time, the feed valve a is closed, the recoil valve a is opened at the same time, the recoil timing is started, and after the recoil timing reaches the preset time, the feed valve a is opened at the same time when the recoil valve a is closed. The above-mentioned sequence control steps complete the back flushing of the a-series feed unit, and the same sequence control steps can be used for the back flushing of the b-series feed unit after the back flushing of the a-series feed unit is completed.

Preferably, the raw material in the reuse water buffer tanks is washing water with pH of 5< 10 and total hardness of 400ppm, the raw material in the tar buffer tanks is coal tar, the pressure of media in the two buffer tanks is 0-1 MPaG, and the temperature is 2-120 ℃.

Compared with the prior art, the invention has the beneficial effects that: the oil-water intensive mixer provided by the coal tar washing and purifying device strengthens the process that fluid is broken into small liquid drops and is rapidly dispersed in another liquid through the ingenious flow channel design and the reasonable arrangement of the filter element structure, and reduces the mixing scale of two-phase flow to a great extent under the conditions of no moving parts and no auxiliary air flow, thereby realizing the high-efficiency mixing of the two liquids and strengthening the mass transfer process in the water washing process. In addition, the flange connection structure and the threaded connection structure at the relevant parts are favorable for disassembly and maintenance of the equipment and replacement of spare parts.

According to the oil-water separator provided by the invention, the coalescence principle of water drops on the surface of the functional material and the gravity layering principle of oil and water are integrated in the same equipment for effective combined application, so that suspended small water drops in an oil-water mixture can be quickly coalesced into large water drops, the oil-water separation process is further remarkably accelerated, and the primary high-efficiency separation of the oil-water mixture is realized. In addition, the arrangement of a plurality of groups of coalescers provides a hardware foundation for the on-line automatic back flushing process of the equipment, thereby laying a solid foundation for the long-period operation of the equipment. In addition, the arrangement of the liquid isolation plate in the device provides important conditions for efficient separation and output of the above-water oil layer, the water layer and the underwater oil layer. In addition, the liquid-solid separator enables a small amount of particles in the raw material liquid to be separated from the oil-water separator and to be removed on line after backflushing, and the separated liquid circulates back to the interior of the device, so that self-cleaning and long-period operation of the oil-water separator are realized under the condition that a new backflushing medium is not introduced.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the overall structure of the oil-water strong mixer of the present invention;

FIG. 3 is a schematic view of the overall structure of the oil-water separator according to the present invention;

FIG. 4 is a schematic structural diagram of a fluid separator plate in the oil-water separator apparatus of the present invention.

Description of reference numerals:

01. a reuse water buffer tank; 02. a water inlet pump; 03. a feed valve a; 04. a feed valve b; 05. a recoil valve b; 06. a recoil valve a; 07. an oil-water separator; 08. a safety valve; 09. a light oil lead-out valve; 010. light oil; 011. washing water; 012. a washing water lead-out valve; 013. heavy oil; 014. a heavy oil lead-out valve; 015. oil sludge; 016. a liquid-solid separator; 017. a tar buffer tank; 018. an oil inlet flow regulating valve; 019. an oil inlet pump; 020. a water inlet flow regulating valve; 021. an oil-water strong mixer;

100. an upper housing; 200. a lower housing; 300. a filter element assembly; 101. a liquid outlet pipe orifice; 102. the liquid outlet pipe is provided with a variable diameter part; 103. a liquid outlet pipe barrel body; 104. a balance hole; 105. a long cylinder end socket of the upper shell; 106. a continuous phase liquid inlet pipe orifice; 107. sealing head internal threads; 108. an upper housing flange; 201. a lower housing flange; 202. a dispersed phase liquid inlet pipe orifice; 203. a lower housing straight barrel; 204. a lower shell end enclosure; 205. a sewage pipe orifice; 301. the end of the filter element; 302. a cartridge body; 303. and (4) external threads of the filter element.

110. A settling cylinder; 210. a coalescer; 1. an access hole; 2. sealing a head of the settling cylinder; 3. reserving a pipe orifice; 4. a straight cylinder body; 5. a first-stage lower side liquid guide pipe orifice; 6. a primary upper side liquid guide pipe orifice; 7. a liquid barrier; 8. light oil connecting pipes; 9. a water phase connecting pipe; 10. a secondary upper side drainage pipe orifice; 11. a secondary lower side drainage pipe orifice; 12. heavy oil pipe connection; 13. an equipment support; 81. a short section; 82. a connecting pipe reducing head; 83. a pipe connecting flange; 211. a feed tube orifice; 212. a coalescer seal head; 213. a coalescing core; 214. a coalescer cylinder; 215. a coalescer flange pair; 216. a distribution plate.

Detailed Description

Detailed description of the preferred embodimentsthe following detailed description of the present invention will be given with reference to the accompanying drawings 1-4, but it should be understood that the scope of the present invention is not limited to the specific embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The invention provides a washing and purifying device of coal tar, which comprises a reuse water buffer tank 01; the oil-water separator comprises a tar buffer tank 017 and an oil-water strong mixer 021, wherein the oil-water strong mixer 021 comprises an upper shell 100, a lower shell 200 and a filter element component 300; a liquid outlet tube body 103 is arranged in the upper shell 100, a liquid outlet tube opening 101 is formed in the top end of the liquid outlet tube body 103, a balance hole 104 is formed in the position, close to the top end, of the liquid outlet tube body 103, a continuous phase liquid inlet tube opening 106 is formed in the position, close to the top end, of the side wall of the upper shell 100, the balance hole 104 is located above the continuous phase liquid inlet tube opening 106, and the continuous phase liquid inlet tube opening 106 is communicated with a tar buffer tank 017 through an oil inlet pump 019; the upper shell 100 is detachably connected with the lower shell 200, the filter element assembly 300 is positioned in the lower shell 200, and the upper end of the filter element assembly 300 is detachably connected with the lower end of the upper shell 100; the side wall of the lower shell 200 is provided with a dispersed phase liquid inlet pipe orifice 202, and the dispersed phase liquid inlet pipe orifice 202 is connected with a recycled water buffer tank 01 through a water inlet pump 02; the bottom of the lower housing 200 is provided with a sewage nozzle 205.

Preferably, the oil-water separator 07 is further included, and the oil-water separator 07 comprises a settling cylinder 110 and a coalescer 210 arranged in the settling cylinder 110; the liquid inlet end of the coalescer 210 is connected with the liquid outlet pipe orifice 101 of the oil-water strong mixer 021; the setting of a section of thick bamboo 110 level subsides, its one end is located to coalescer 210, the other end of a section of thick bamboo 110 is equipped with light oil takeover 8, water phase takeover 9 and heavy oil takeover 12, just the top of a section of thick bamboo 110 is all located to light oil takeover 8 and water phase takeover 9, and the bottom of a section of thick bamboo 110 is located to heavy oil takeover 12, the interior top of a section of thick bamboo 110 that subsides between light oil takeover 8 and the water phase takeover 9 still is equipped with liquid-proof plate 7, and the bottom of liquid-proof plate 7 and a section of thick bamboo 110 bottom reserve the clearance of subsiding.

Preferably, the sidewall of the settling cylinder 110 is further provided with a primary lower liquid guide pipe orifice 5, a primary upper liquid guide pipe orifice 6, a secondary upper liquid guide pipe orifice 10 and a secondary lower liquid guide pipe orifice 11 which are communicated with the internal liquid; the oil-water separator 07 is communicated with a first-stage remote transmission boundary level meter through a first-stage lower side liquid guide pipe orifice 5 and a first-stage upper side liquid guide pipe orifice 6, and is communicated with a second-stage remote transmission boundary level meter through a second-stage upper side liquid guide pipe orifice 10 and a second-stage lower side liquid guide pipe orifice 11.

Preferably, a water inlet flow regulating valve 020 is arranged on a communicating pipe between the dispersed phase liquid inlet pipe orifice 202 and the water inlet pump 02, a water inlet flow regulating valve 018 is arranged on a communicating pipe between the continuous phase liquid inlet pipe orifice 106 and the oil inlet pump 019, the light oil connecting pipe 8, the water phase connecting pipe 9 and the heavy oil connecting pipe 12 are respectively connected with corresponding product collecting bins, and each connecting pipeline is correspondingly provided with a light oil outlet valve 09, a washing water outlet valve 012 and a heavy oil outlet valve 014.

Preferably, a liquid outlet pipe orifice 101 of the oil-water strong mixer 021 is communicated with the bottom of the oil-water separator 07 through two branch pipelines connected in parallel, and the two branch pipelines are respectively communicated with a feed valve a03 and a feed valve b 04; the feed valve a03 and the feed valve b04 are respectively communicated with two branch pipelines communicated with the bottom of the oil-water separator 07 and lead out two parallel liquid drainage branch pipelines, the two parallel liquid drainage branch pipelines are communicated with an inlet of the liquid-solid separator 016 after being converged and communicated through a liquid drainage main pipeline, one outlet of the liquid-solid separator 016 is communicated with an intermediate product oil sludge collection bin 015, the other outlet of the liquid-solid separator 016 is communicated with an oil inlet pipeline at an inlet of an oil inlet pump 019 through a liquid drainage main pipeline, and the two liquid drainage branch pipelines are respectively communicated with a backflushing valve a06 and a backflushing valve b 05.

Preferably, the oil-water separator 07 is further connected with a safety valve 08, a discharge pipe orifice of the safety valve 08 is communicated with a pipe orifice of a related device at the top of the tar buffer tank 017 through a pipeline, and the pipeline is provided with a slope, so that the discharged liquid flows into the tar buffer tank 017 under the action of gravity.

Preferably, coalescer 210 comprises feed pipe orifice 211, coalescer head 212, coalescer core 213, distributor plate 216, coalescer cylinder 214, and coalescer flange pair 215; one end of the coalescer seal head 212 is connected with the feed pipe orifice 211, the other end is connected with the coalescer cylinder body 214 through the coalescer flange pair 215, the upper end of the coalescer cylinder body 214 is communicated with the bottom of the settling cylinder 110, the inlet of the coalescing core 213 is communicated with the distribution plate 216, the edge of the distribution plate 216 is seamlessly connected with the inner wall of the coalescer cylinder body 214, and the feed pipe orifice 211 is connected with the liquid outlet pipe orifice 101.

The invention also provides a purification method of the coal tar washing and purifying device, which comprises the following steps:

the method comprises the steps of closing a recoil valve b05, a recoil valve a06, a heavy oil lead-out valve 014, an oil inlet flow regulating valve 018 and a water inlet flow regulating valve 020, and simultaneously opening a feed valve a03, a feed valve b04, a light oil lead-out valve 09 and a washing water lead-out valve 012;

starting the water inlet pump 02 and the oil inlet pump 019, then adjusting the opening degrees of the oil inlet flow regulating valve 018 and the water inlet flow regulating valve 020 to enable the two raw material liquids to be mixed by the oil-water strong mixer 021 and then to be injected into the oil-water separator 07, then controlling the opening degree of the light oil extraction valve 09 according to the numerical value change of the primary remote transmission boundary level meter (LC1), and controlling the opening degrees of the washing water extraction valve 012 and the heavy oil extraction valve 014 according to the numerical value change of the secondary remote transmission boundary level meter (LC 2);

after the device runs for a preset period of time, the feed valve a03 is closed, the recoil valve a06 is opened and the recoil timing is started, and after the recoil timing reaches the preset time, the recoil valve a06 is closed and the feed valve a03 is opened. The above-mentioned sequence control steps complete the back flushing of the a-series feed unit, and the same sequence control steps can be used for the back flushing of the b-series feed unit after the back flushing of the a-series feed unit is completed.

Preferably, the raw material in the reuse water buffer tank 01 is washing water with pH being 5-10 and total hardness being 400ppm, the raw material in the tar buffer tank 017 is coal tar, the pressure of media in the two buffer tanks is 0-1 MPaG, and the temperature is 2-120 ℃.

As shown in fig. 1, the apparatus of this embodiment includes a reuse water buffer tank 01, a water inlet pump 02, a feed valve a03, a feed valve b04, a backwash valve b05, a backwash valve a06, an oil-water separator 07, a safety valve 08, a light oil lead-out valve 09, light oil 010, wash water 011, a wash water lead-out valve 012, heavy oil 013, a heavy oil lead-out valve 014, oil sludge 015, a liquid-solid separator 016, a tar buffer tank 017, an oil inlet flow rate adjusting valve 018, an oil inlet pump 019, an inlet water flow rate adjusting valve 020, and an oil-water strong mixer 021.

The recycled water buffer tank 01 is communicated with a water inlet pump 02 through a water inlet pipeline, the water inlet pump 02 is communicated with a dispersed phase liquid inlet pipe orifice 202 of an oil-water strong mixer 021 through a water inlet pipeline, and a water inlet flow regulating valve 020 is communicated with the pipeline;

the tar buffer tank 017 is communicated with an oil inlet pump 019 through an oil inlet pipeline, the oil inlet pump 019 is communicated with a continuous phase liquid inlet pipe orifice 106 of an oil-water strong mixer 021 through the oil inlet pipeline, and an oil inlet flow regulating valve 018 is communicated with the pipeline;

a liquid outlet pipe orifice 101 of the oil-water strong mixer 021 is communicated with the bottom of the oil-water separator 07 through two branch pipelines which are connected in parallel, and a feed valve a03 and a feed valve b04 are respectively communicated with the two branch pipelines;

the feed valve a03 and the feed valve b04 are respectively communicated with two branch pipelines communicated with the bottom of the oil-water separator 07 and lead out two parallel liquid drainage branch pipelines, the two parallel liquid drainage branch pipelines are communicated with an inlet of the liquid-solid separator 016 after being converged and communicated through a liquid drainage main pipeline, one outlet of the liquid-solid separation equipment is communicated with the intermediate product oil sludge 015, the other outlet of the liquid-solid separation equipment is communicated with an oil inlet pipeline at an inlet of an oil inlet pump 019 through the liquid drainage main pipeline, and the two liquid drainage branch pipelines are respectively communicated with a backflushing valve a06 and a backflushing valve b 05;

the safety valve 08 is communicated with a related equipment pipe orifice at the top of the oil-water separator 07, a drainage pipe orifice of the safety valve 08 is communicated with a related equipment pipe orifice at the top of the tar buffer tank 017 through a pipeline, and the pipeline is provided with a bag-free slope, so that the principle that drainage liquid can flow into the tar buffer tank 017 by means of gravity is taken as a principle;

and the light oil 010, the washing water 011 and the heavy oil 013 are respectively communicated with the corresponding equipment pipe orifices of the oil-water separator 07 through pipelines, and the three parallel pipelines are sequentially and respectively communicated with a light oil leading-out valve 09, a washing water leading-out valve 012 and a heavy oil leading-out valve 014.

The water inlet pump 02 and the oil inlet pump 019 can be provided with standby pumps, and the types of the pumps can be selected from but not limited to a centrifugal pump, an axial flow pump and a vortex pump.

The feed valve a03, the feed valve b04, the backflushing valve b05, the backflushing valve a06, the light oil leading-out valve 09, the washing water leading-out valve 012, the heavy oil leading-out valve 014, the oil inlet flow regulating valve 018 and the water inlet flow regulating valve 020 are all remote automatic control valves, and the types of the valves can be selected from but not limited to ball valves, stop valves, gate valves and needle valves.

As shown in fig. 2, the oil-water strong mixer 021 includes an upper casing 100, a lower casing 200, and a filter element assembly 300; the upper shell 100 comprises a liquid outlet pipe orifice 101, a liquid outlet pipe variable-diameter part 102, a liquid outlet pipe barrel 103, a balance hole 104, an upper shell long barrel seal head 105, a continuous phase liquid inlet pipe orifice 106, seal head internal threads 107 and an upper shell flange 108; the lower shell 200 comprises a lower shell flange 201, a dispersed phase liquid inlet pipe orifice 202, a lower shell straight cylinder 203, a lower shell end enclosure 204 and a sewage discharge pipe orifice 205; the filter element assembly 300 comprises a filter element end head 301, a filter element cylinder 302 and a filter element external thread 303; the upper shell 100 and the lower shell 200 are respectively connected in a matching and detachable manner through an upper shell flange 108 and a lower shell flange 201. The arrangement of detachable connection is beneficial to the installation and maintenance of the components in the equipment; the upper shell 100 and the filter element assembly 300 are respectively connected in a matching and detachable mode through the end socket internal thread 107 and the filter element external thread 303. The arrangement of detachable connection is beneficial to the installation and maintenance of the components in the equipment;

the liquid outlet pipe orifice 101, the liquid outlet pipe variable-diameter part 102, the liquid outlet pipe cylinder 103, the upper shell long cylinder end enclosure 105, the end enclosure internal thread 107 and the upper shell flange 108 are sequentially connected from top to bottom in a seamless manner; the liquid outlet pipe cylinder body 103 is of a straight pipe structure, the upper shell long cylinder end socket 105 is an attached straight pipe section end socket, and an annular space cavity is formed between the liquid outlet pipe cylinder body 103 and the upper shell long cylinder end socket 105;

the balance hole 104 is a round hole on the liquid outlet tube cylinder 103 and is close to the joint of the liquid outlet tube cylinder 103 and the upper shell long tube end enclosure 105. The arrangement of the balance holes is beneficial to the discharge of a small amount of bubbles carried in the liquid, so that an air bag is prevented from being formed locally, and the relative movement of the two kinds of liquid to be treated is greatly weakened;

and the continuous phase liquid inlet pipe orifice 106 is tangentially communicated with a straight pipe section of the upper shell long cylinder end socket 105. The tangential connection is favorable for forming rotational flow;

the lower shell flange 201, the lower shell straight cylinder 203, the lower shell end socket 204 and the sewage pipe orifice 205 are sequentially connected in a seamless mode from top to bottom;

the dispersed phase liquid inlet pipe orifice 202 is tangentially communicated with the lower shell straight cylinder 203, and the rotating directions of two fluids entering the mixing device through the dispersed phase liquid inlet pipe orifice 202 and the continuous phase liquid inlet pipe orifice 106 are opposite. The tangential connection facilitates the formation of a swirling flow. The opposite rotational flows are beneficial to accelerating the relative movement of the two liquids, thereby being beneficial to the crushing of the dispersed phase liquid;

the filter element end 301, the filter element barrel 302 and the filter element external thread 303 are sequentially connected in a seamless mode from bottom to top; the filter element barrel 302 is of a circular tube structure, the circular tube has certain permeability, and a ceramic filter element, a sintered metal filter element, a powder metallurgy filter element, a functional material base composite filter element or a dense weaving metal wire mesh can be selected. The filter element is arranged for strengthening the crushing of the dispersed phase liquid;

the vertical height L1 and the whole equipment height L2 between the inner side of the filter element end 301 and the bottommost end of the liquid outlet pipe cylinder 103 need to satisfy the following constraint conditions: l1 is more than or equal to 10mm and less than or equal to 1000mm, and L2 is more than or equal to 300mm and less than or equal to 3000 mm. The constraint of the condition can lock the outline of the equipment in a reasonable interval;

the inner diameter d1 of the straight pipe section of the upper shell long cylinder end socket 105, the outer diameter d2 of the liquid outlet pipe cylinder 103, the inner diameter d3 of the balance hole 104, the inner diameter d4 of the filter element cylinder 302, the outer diameter d5 of the filter element cylinder 302 and the inner diameter d6 of the lower shell straight cylinder 203 meet the following constraint conditions: d2< d4< d5< d1< d 6< 1000mm, d3< 1mm < 20 mm. The constraint condition can further make the equipment internals more reasonable in arrangement;

the upper housing 100, the lower housing 200, and the filter element assembly 300 are assembled and then vertically installed for use. This limitation is set out mainly in consideration of the exhaust function of the balance hole 104.

As shown in fig. 3, the oil water separator 07 includes a settling drum 110, a coalescer 210;

the settling cylinder 110 comprises a straight cylinder body 4, two settling cylinder end sockets 2 communicated with two ends of the straight cylinder body 4, two access holes 1 communicated with the two settling cylinder end sockets 2, a liquid separation plate 7 connected with the inner wall of the straight cylinder body 4, a primary lower side liquid guide pipe orifice 5, a primary upper side liquid guide pipe orifice 6, a light oil connecting pipe 8, a water phase connecting pipe 9, a secondary upper side liquid guide pipe orifice 10, a secondary lower side liquid guide pipe orifice 11 and a heavy oil connecting pipe 12 which are respectively communicated with the straight cylinder body 4;

the coalescer 210 comprises a feed pipe orifice 211, a coalescer head 212 communicated with the feed pipe orifice 211, a coalescing core 213, a distribution plate 216 communicated with the inlet of the coalescing core 213, and a coalescer cylinder 214 seamlessly connected with the outer edge of the distribution plate 216;

the upper end of the coalescer cylinder 214 is communicated with the bottom of the straight cylinder 4, and the lower end of the coalescer cylinder 214 is communicated with the upper end of the coalescer flange pair 215; the upper end of the coalescer seal head 212 is communicated with the lower end of the coalescer flange pair 215;

the straight cylinder body 4 is a cylinder, and the axis of the straight cylinder body is parallel to the horizontal plane; the top of the straight cylinder body 4 is provided with 1-10 reserved pipe orifices 3 which are communicated with the cylinder body 4; the outer surface of the bottom of the straight cylinder body 4 is provided with 2-8 equipment supports 13. The reserved pipe orifice 3 can be used for installing instruments and meters such as a safety valve, a pressure gauge, a thermometer and the like; the equipment support 13 is favorable for the installation of the equipment and bases such as a matched civil engineering frame.

The one-level lower side liquid guide pipe orifice 5 and the one-level upper side liquid guide pipe orifice 6 are vertically paired, are arranged in 1-5 pairs, are both positioned on the straight barrel body 4 between the feeding side settling barrel end socket 2 and the liquid separation plate 7, and the axis of the one-level lower side liquid guide pipe orifice 5 and the lowest point of the liquid separation plate 7 are positioned on the same horizontal plane. The matched drainage pipe orifice is mainly used for dynamically measuring the interface of light oil and water;

the two-stage upper side liquid guide pipe orifice 10 and the two-stage lower side liquid guide pipe orifice 11 are vertically paired, are arranged in 1-5 pairs, are both positioned on the straight barrel body 4 between the discharge side settling barrel seal head 2 and the liquid separation plate 7, and the horizontal plane where the axis of the two-stage lower side liquid guide pipe orifice 11 is positioned is lower than the lowest point of the liquid separation plate 7. The matching of the drainage pipe orifice is mainly used for dynamically measuring the interface of heavy oil and water. The arrangement of a plurality of pairs of matched liquid guide pipe orifices is mainly used for preventing the false alarm of instrument faults or the switching maintenance in the operation process;

the first-stage lower side liquid guide pipe orifice 5, the first-stage upper side liquid guide pipe orifice 6, the second-stage upper side liquid guide pipe orifice 10 and the second-stage lower side liquid guide pipe orifice 11 are all communicated with an interface metering instrument, and the interface metering instrument is selected from one or more of differential pressure type, float type, capacitance type, radio frequency admittance type or radar type;

the liquid separation plate 7 (see fig. 4) is a circular plate with the inner diameter slightly smaller than that of the straight cylinder 4, and is a large cutting circular plate formed by cutting off a part of the plate close to the lower side on a certain horizontal plane; the liquid separation plate 7 is vertical to the axis of the straight cylinder body 4, and the arc part of the liquid separation plate 7 is in seamless connection with the inner wall surface of the top side of the straight cylinder body 4;

the light oil connecting pipe 8, the water phase connecting pipe 9 and the heavy oil connecting pipe 12 respectively comprise three parts, namely a short joint 81, a connecting pipe reducing joint 82 and a connecting pipe flange 83 which are sequentially communicated; the light oil connecting pipe 8 and the water phase connecting pipe 9 are both communicated with the top of the straight barrel body 4, and the heavy oil connecting pipe 12 is communicated with the bottom of the straight barrel body 4;

the number of coalescers 210 is 2-6. The arrangement of more than 2 coalescers 210 provides a hardware basis for the on-line switching and on-line backwashing of the coalescing cores 213;

the ranges of the length L1 and the inner diameter d1 of the straight cylinder body 4 are respectively that L1 is more than or equal to 1m and less than or equal to 50m, and d1 is more than or equal to 500mm and less than or equal to 5000 mm; the inner diameter d2 of the access hole 1 is within the range of d2 being more than or equal to 400mm and less than or equal to 1000 mm; the inside diameter d3 of the coalescer cylinder 214 ranges from 400mm < d3< 4000mm, and has d3< d 1. The critical dimension of part of the equipment is limited, so that the whole size of the equipment is in a reasonable controllable range;

the length L2 of the coalescent core 213, the minimum horizontal distance L3 between the end edge of the feeding end of the straight cylinder 4 and the coalescent cylinder 214, the maximum horizontal distance L4 between the end edge of the discharging end of the straight cylinder 4 and the heavy oil connecting pipe 12, the horizontal distance L5 between the end edge of the discharging end of the straight cylinder 4 and the liquid-separating plate 7, the maximum horizontal distance L6 between the end edge of the discharging end of the straight cylinder 4 and the water connecting pipe 9, and the minimum horizontal distance L7 between the end edge of the discharging end of the straight cylinder 4 and the light oil connecting pipe 8, need to satisfy the following constraint conditions: l2 is more than or equal to 400mm and less than or equal to 5000mm, L3 is more than or equal to 50mm and less than or equal to 500mm, L4 is more than or equal to 200mm and less than L5 is more than or equal to L7 and less than or equal to 4000mm, and L6 is more than or equal to 200mm and less than or equal to L5. The definition of partial key size enables each key component to be arranged in a reasonable space;

vertical height h1 between one-level downside drain pipe mouth 5 and one-level upside drain pipe mouth 6, vertical height h2 between the horizontal outer fringe in liquid partition 7 bottom and the top outer fringe, vertical height h3 between second grade upside drain pipe mouth 10 and second grade downside drain pipe mouth 11 need satisfy following constraint condition: 0.5d1< h1< h2< h 3< 0.99d 1. The defined arrangement ensures that the relevant interface level measuring instruments can be arranged in a reasonable area.

The oil-water separator 07 is provided with a first-stage remote transmission boundary level meter LC1 through the communication of a first-stage lower side liquid guide pipe orifice 5 and a first-stage upper side liquid guide pipe orifice 6 in the device, and is provided with a second-stage remote transmission boundary level meter LC2 through the communication of a second-stage upper side liquid guide pipe orifice 10 and a second-stage lower side liquid guide pipe orifice 11 in the device.

The raw material in the recycled water buffer tank 01 is washing water with pH being 5-10 and total hardness being 400ppm, the raw material in the tar buffer tank 017 is coal tar, and the pressure and temperature ranges of media in the two buffer tanks are 0-1 MPaG and 2-120 ℃.

The manipulation method of the present invention is as follows,

step 1: the method comprises the steps of closing a recoil valve b05, a recoil valve a06, a heavy oil lead-out valve 014, an oil inlet flow regulating valve 018 and a water inlet flow regulating valve 020, and simultaneously opening a feed valve a03, a feed valve b04, a light oil lead-out valve 09 and a washing water lead-out valve 012;

step 2: starting the water inlet pump 02 and the oil inlet pump 019, then adjusting the opening degrees of the oil inlet flow regulating valve 018 and the water inlet flow regulating valve 020 to enable the two raw material liquids to be mixed by the oil-water strong mixer 021 and then injected into the oil-water separator 07, then controlling the opening degree of the light oil extraction valve 09 according to the numerical value change of the primary remote interface level meter LC1, and controlling the opening degrees of the washing water extraction valve 012 and the heavy oil extraction valve 014 according to the numerical value change of the secondary remote interface level meter LC 2;

and step 3: after the device runs for a preset period of time, the feed valve a03 is closed, the recoil valve a06 is opened and the recoil timing is started, and after the recoil timing reaches the preset time, the recoil valve a06 is closed and the feed valve a03 is opened. The above-mentioned sequence control steps complete the back flushing of the a-series feed unit, and the same sequence control steps can be used for the back flushing of the b-series feed unit after the back flushing of the a-series feed unit is completed.

The coal tar in the tar buffer tank and the washing water in the reuse water buffer tank of the embodiment are respectively conveyed to the oil-water strong mixer through the pump, are rapidly and intensively mixed and then flow into the oil-water separator, are respectively regulated and controlled through the light oil leading-out valve, the washing water leading-out valve and the heavy oil leading-out valve which are connected in parallel after being coalesced and settled for layering, and lead out three products of light oil, washing water and heavy oil, and periodically back flush is carried out by taking self-produced liquid in the device as a cleaning agent, so that a small amount of solid impurities in the coal tar can be removed on line in the arranged liquid-solid separator, and further the coal tar is continuously and efficiently washed and purified in the device.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. A washing and purifying device for coal tar is characterized by comprising:

a reuse water buffer tank (01);

a tar buffer tank (017);

the oil-water forced mixer (021) comprises an upper shell (100), a lower shell (200) and a filter element component (300); a liquid outlet tube body (103) is arranged in the upper shell (100), an annular space cavity is formed between the liquid outlet tube body (103) and the upper shell (100), a liquid outlet tube opening (101) is formed in the top end of the liquid outlet tube body (103), a balance hole (104) is formed in the position, close to the top end, of the liquid outlet tube body (103), a continuous phase liquid inlet tube opening (106) is formed in the position, close to the top end, of the side wall of the upper shell (100), the balance hole (104) is located above the continuous phase liquid inlet tube opening (106), and the continuous phase liquid inlet tube opening (106) is communicated with a tar buffer tank (017) through an oil inlet pump (019);

the upper shell (100) and the lower shell (200) are detachably connected, the filter element assembly (300) is positioned in the lower shell (200), and the upper end of the filter element assembly (300) is detachably connected with the lower end of the upper shell (100); the side wall of the lower shell (200) is provided with a dispersed phase liquid inlet pipe orifice (202), and the dispersed phase liquid inlet pipe orifice (202) is connected with a reuse water buffer tank (01) through a water inlet pump (02); the bottom of the lower shell (200) is provided with a sewage pipe orifice (205).

2. The coal tar washing and purifying device according to claim 1, characterized in that the device further comprises a water oil separator (07), wherein the water oil separator (07) comprises a settling cylinder (110) and a coalescer (210) arranged in the settling cylinder (110); the liquid inlet end of the coalescer (210) is connected with a liquid outlet pipe orifice (101) of the oil-water strong mixer (021); subside a section of thick bamboo (110) level setting, its one end is located in coalescer (210), the other end of subsideing a section of thick bamboo (110) is equipped with light oil takeover (8), water phase takeover (9) and heavy oil takeover (12), just the top of subsideing a section of thick bamboo (110) is all located in light oil takeover (8) and water phase takeover (9), and the bottom of subsideing a section of thick bamboo (110) is located in heavy oil takeover (12), the interior top of subsideing a section of thick bamboo (110) between light oil takeover (8) and water phase takeover (9) still is equipped with liquid barrier (7), and the bottom of liquid barrier (7) and subside a section of thick bamboo (110) bottom reserve the clearance.

3. The coal tar washing and purifying device according to claim 2, wherein the side wall of the settling drum (110) is further provided with a primary lower liquid guide pipe orifice (5), a primary upper liquid guide pipe orifice (6), a secondary upper liquid guide pipe orifice (10) and a secondary lower liquid guide pipe orifice (11) which are in liquid communication with the interior; the oil-water separator (07) is communicated with a first-level remote transmission boundary level meter through a first-level lower side liquid guide pipe orifice (5) and a first-level upper side liquid guide pipe orifice (6), and is communicated with a second-level remote transmission boundary level meter through a second-level upper side liquid guide pipe orifice (10) and a second-level lower side liquid guide pipe orifice (11).

4. The coal tar washing and purifying device according to claim 3, wherein a water inlet flow regulating valve (020) is arranged on a communicating pipe between the dispersed phase liquid inlet pipe orifice (202) and the water inlet pump (02), a water inlet flow regulating valve (018) is arranged on a communicating pipe between the continuous phase liquid inlet pipe orifice (106) and the water inlet pump (019), the light oil connecting pipe (8), the water phase connecting pipe (9) and the heavy oil connecting pipe (12) are respectively connected with the corresponding product collecting bin, and a light oil outlet valve (09), a washing water outlet valve (012) and a heavy oil outlet valve (014) are correspondingly arranged on each connecting pipeline.

5. The coal tar washing and purifying device according to claim 4, wherein the outlet pipe (101) of the oil-water strong mixer (021) is communicated with the bottom of the oil-water separator (07) through two branch pipes which are connected in parallel, and the two branch pipes are respectively communicated with a feed valve a (03) and a feed valve b (04); feed valve a (03), on two spinal branch pipelines of feed valve b (04) and oil water separator (07) bottom intercommunication, communicate respectively and draw forth two parallelly connected flowing back spinal branch pipelines, two parallelly connected flowing back spinal branch pipelines join the intercommunication through the total pipeline of flowing back after with liquid-solid separator (016) entry intercommunication, storehouse (015) intercommunication is collected with intermediate product fatlute to an export and this liquid-solid separator (016), another export is through the total pipeline of flowing back and advances oil pipe intercommunication with oil feed pump (019) entry, and communicate respectively on two flowing back spinal branch pipelines and be provided with recoil valve a (06) and recoil valve b (05).

6. The coal tar washing and purifying device as claimed in claim 5, characterized in that a safety valve (08) is further connected to the oil-water separator (07), a drainage pipe orifice of the safety valve (08) is communicated with an equipment pipe orifice related to the top of the tar buffer tank (017) through a pipeline, and the pipeline is provided with a slope, so that the drainage liquid flows into the tar buffer tank (017) under the action of gravity.

7. The coal tar washing purification device according to claim 2, wherein the coalescer (210) comprises a feed pipe orifice (211), a coalescer head (212), a coalescer core (213), a distribution plate (216), a coalescer cylinder (214) and a coalescer flange pair (215); one end of the coalescer seal head (212) is connected with the feed pipe orifice (211), the other end is connected with the coalescer cylinder body (214) through the coalescer flange pair (215), the upper end of the coalescer cylinder body (214) is communicated with the bottom of the settling cylinder (110), the inlet of the coalescing core (213) is communicated with the distribution plate (216), the edge of the distribution plate (216) is seamlessly connected with the inner wall of the coalescer cylinder body (214), and the feed pipe orifice (211) is connected with the liquid outlet pipe orifice (101).

8. The method for cleaning a coal tar washing and purifying device according to claim 6, which comprises the following steps:

the method comprises the steps that a recoil valve b (05), a recoil valve a (06), a heavy oil leading-out valve (014), an oil inlet flow regulating valve (018) and a water inlet flow regulating valve (020) are closed, and simultaneously a feeding valve a (03), a feeding valve b (04), a light oil leading-out valve (09) and a washing water leading-out valve (012) are opened;

starting a water inlet pump (02) and a oil inlet pump (019), then adjusting the opening degrees of a water inlet flow regulating valve (018) and a water inlet flow regulating valve (020), mixing two raw material liquids by an oil-water strong mixer (021), injecting the two raw material liquids into an oil-water separator (07), then controlling the opening degree of a light oil leading-out valve (09) according to the numerical change of a primary remote interface level meter, and controlling the opening degrees of a washing water leading-out valve (012) and a heavy oil leading-out valve (014) according to the numerical change of a secondary remote interface level meter;

after the device runs for a preset period of time, the feed valve a (03) is closed, the recoil valve a (06) is opened and recoil timing is started, and after the recoil timing reaches the preset time, the feed valve a (03) is opened while the recoil valve a (06) is closed. The above-mentioned sequence control steps complete the back flushing of the a-series feed unit, and the same sequence control steps can be used for the back flushing of the b-series feed unit after the back flushing of the a-series feed unit is completed.

9. The method for purifying the coal tar washing and purifying device according to claim 8, wherein the raw material in the reuse water buffer tank (01) is washing water with pH of 5< 10 and total hardness of 400ppm, the raw material in the tar buffer tank (017) is coal tar, the pressure of the media in the two buffer tanks is 0-1 MPaG, and the temperature is 2-120 ℃.

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