CN115724407B - Liquid sulfur degassing device and method - Google Patents
Liquid sulfur degassing device and method Download PDFInfo
- Publication number
- CN115724407B CN115724407B CN202111016749.1A CN202111016749A CN115724407B CN 115724407 B CN115724407 B CN 115724407B CN 202111016749 A CN202111016749 A CN 202111016749A CN 115724407 B CN115724407 B CN 115724407B
- Authority
- CN
- China
- Prior art keywords
- liquid sulfur
- shell
- degassing
- outlet
- degassed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 548
- 239000007788 liquid Substances 0.000 title claims abstract description 547
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 543
- 239000011593 sulfur Substances 0.000 title claims abstract description 543
- 238000007872 degassing Methods 0.000 title claims abstract description 192
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000002826 coolant Substances 0.000 claims abstract description 59
- 238000004891 communication Methods 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 238000003860 storage Methods 0.000 claims description 35
- 239000007789 gas Substances 0.000 claims description 31
- 238000000926 separation method Methods 0.000 claims description 29
- 239000002912 waste gas Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 15
- 238000005265 energy consumption Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 239000000110 cooling liquid Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000011473 acid brick Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 229920001021 polysulfide Polymers 0.000 description 2
- 239000005077 polysulfide Substances 0.000 description 2
- 150000008117 polysulfides Polymers 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000011456 concrete brick Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Degasification And Air Bubble Elimination (AREA)
Abstract
The present disclosure relates to a liquid sulfur degasser and method. The device comprises a liquid sulfur cooler (1) and a liquid sulfur tank (2); the liquid sulfur tank comprises a first shell, and the liquid sulfur cooler comprises a second shell; the second shell of the liquid sulfur cooler is arranged along the vertical direction, penetrates through the first shell from the upper part of the liquid sulfur tank and extends to the inside of the liquid sulfur tank; the liquid sulfur cooler comprises a shell side and a tube side, wherein the tube side is provided with a cooling medium inlet and a preheated cooling medium outlet, and the cooling medium inlet and the preheated cooling medium outlet are respectively positioned outside the first shell; the shell side is provided with a liquid sulfur inlet to be cooled and a low-temperature liquid sulfur outlet to be degassed, and the low-temperature liquid sulfur outlet to be degassed is arranged on an extension shell of the second shell in the liquid sulfur tank so that the shell side is in fluid communication with the interior of the liquid sulfur tank. Simplifying the liquid sulfur degassing process flow, saving large occupied area and reducing the investment of the device.
Description
Technical Field
The present disclosure relates to the field of oil refining and natural gas purification, and in particular, to a liquid sulfur degasser and method.
Background
At present, a Claus process is commonly adopted in sulfur recovery devices of domestic refineries and natural gas purification plants. The liquid sulfur of the sulfur recovery unit is condensed and separated in each sulfur cooler, and the mass fraction of H 2 S in the liquid sulfur is usually on the order of several parts per million due to the balance of the gas-liquid two phases, wherein most of the liquid sulfur exists in the form of polysulfide (H 2Sx) and H 2 S. The H 2 S can escape in the subsequent processes of storage, transportation and sales of liquid sulfur or sulfur forming, so that equipment corrosion is caused, long-period stable operation of the device is affected, and safety and environmental protection of operators are damaged. The current industry generally requires degassing treatment before the liquid sulfur is output from a liquid sulfur pool, and the mass fraction of total H 2 S in the liquid sulfur is reduced to below 10 multiplied by 10 -6.
The current methods for degassing liquid sulfur are numerous, but the following defects generally exist: (1) The process flow is longer, the occupied area is large, the one-time investment is large, the liquid sulfur tank generally adopts a multi-partition structure, the liquid sulfur cooler is a fixed tube plate heat exchanger, and the equipment form is complex; (2) The liquid sulfur cooler is used for generating low-pressure exhaust steam, and then the exhaust steam is cooled by the air cooler, so that heat cannot be recovered in the cooling process of the liquid sulfur; (3) The liquid sulfur storage facility adopts a concrete and acid-resistant brick (acid-resistant coating) structure, is easy to damage under the conditions of sudden quenching or high soil water content during the startup and shutdown of the device, and is difficult to overhaul; (4) The operation process is easy to fail, so that the liquid sulfur degassing facility is stopped, and the quality of liquid sulfur products is influenced; (5) The liquid sulfur needs to be boosted and circulated in the device, so that the energy consumption of the device is increased.
Disclosure of Invention
The purpose of the present disclosure is to provide a liquid sulfur degassing device and method, which can effectively remove H 2 S in liquid sulfur, so that the liquid sulfur product meets the standard requirement; meanwhile, the energy of the liquid sulfur cooling process can be recovered, the occupied area and investment of the device are reduced, and the safe and stable long-period operation of the liquid sulfur degassing facility is ensured.
In order to achieve the above object, a first aspect of the present disclosure provides a liquid sulfur degassing apparatus comprising a liquid sulfur cooler and a liquid sulfur tank; the liquid sulfur tank comprises a first shell, and the liquid sulfur cooler comprises a vertical second shell; the second shell of the liquid sulfur cooler penetrates through the first shell from the upper part of the liquid sulfur tank and extends towards the inside of the liquid sulfur tank, so that the second shell comprises an outer shell positioned outside the first shell and an inner shell positioned inside the first shell; the liquid sulfur cooler comprises a shell side and a tube side, wherein the tube side is provided with a cooling medium inlet and a preheated cooling medium outlet, and the cooling medium inlet and the preheated cooling medium outlet are respectively positioned outside the first shell; the shell side is provided with a liquid sulfur inlet to be cooled and a low-temperature liquid sulfur outlet to be degassed, and the low-temperature liquid sulfur outlet to be degassed is arranged on the inner shell of the second shell, so that the shell side is in fluid communication with the inside of the liquid sulfur tank.
Optionally, the liquid sulfur cooler comprises a plurality of baffles and heat exchange tubes; the heat exchange tube extends along the axial direction of the liquid sulfur cooler; the inlet of the heat exchange tube is arranged on the outer shell of the second shell to form the cooling medium inlet, and the outlet of the heat exchange tube is arranged on the outer shell of the second shell to form the preheated cooling medium outlet; the space in the heat exchange tube is formed into the tube side; the liquid sulfur inlet to be cooled is arranged on the inner shell of the second shell and extends to the outside of the first shell through the liquid sulfur conveying pipeline to be degassed; or the to-be-cooled liquid sulfur inlet is positioned on the outer shell of the second shell; the liquid sulfur inlet to be cooled and the low-temperature liquid sulfur outlet to be degassed are respectively communicated with the interior of the second shell so as to form a shell pass between the outer wall of the heat exchange tube and the inner wall of the second shell; the low-temperature liquid sulfur outlet to be degassed is arranged at the bottom of the second shell, the liquid sulfur inlet to be cooled is arranged above the low-temperature liquid sulfur outlet to be degassed, and the baffle plate is arranged between the liquid sulfur inlet to be cooled and the low-temperature liquid sulfur outlet to be degassed; optionally, a plurality of baffles are fixed on the side wall of the second shell at intervals along the axial direction of the liquid sulfur cooler, and the plate surface of each baffle is perpendicular to the side wall of the second shell; optionally, the plurality of baffles are arranged on the side wall of the second shell at intervals along the axial direction of the second shell, so that the plurality of baffles form spiral liquid flow passages from top to bottom.
Optionally, the device further comprises a degassing air distributor, wherein the degassing air distributor is arranged in the first shell and is positioned at the bottom of the first shell; the degassing air distributor is close to a low-temperature liquid sulfur outlet to be degassed of the liquid sulfur cooler; optionally, a plurality of the degassing air distributors are arranged in the first shell; the degassing air distributor is provided with a degassing air inlet which extends to the outside of the first shell through a degassing air introduction line and is communicated with a degassing air input source; the first shell is a horizontal cylindrical shell; the first shell comprises a first end wall and a second end wall which are oppositely arranged, and the first end wall is close to the liquid sulfur cooler; the bottom wall of the liquid sulfur tank has a slope inclined downwards in the direction from the first end wall to the second end wall, optionally, the slope is 1-5 per mill; optionally, the first shell is further provided with a liquid sulfur product outlet and a degassing waste gas outlet, the liquid sulfur product outlet and the degassing waste gas outlet are respectively arranged at the top of the first shell, the liquid sulfur product outlet is close to the second end wall of the first shell, and the degassing waste gas outlet is arranged between the liquid sulfur product outlet and the pipeline opening of the degassing air introducing pipeline.
Optionally, the device further comprises a baffle plate, wherein the baffle plate is arranged on the bottom wall of the first shell and is close to the second end wall, the plate surface of the baffle plate is perpendicular to the bottom wall of the first shell, and the bottom edge of the baffle plate is fixedly connected with the first shell; to form a degassing separation zone between the first end wall and the baffle and a storage zone between the second end wall and the baffle; the inner shell of the liquid sulfur cooler and the degassing air distributor are arranged in the degassing separation zone, and the degassing waste gas outlet is arranged on the top wall of the degassing separation zone and is close to the baffle plate; the liquid sulfur product outlet is arranged on the top wall of the storage area; a space is arranged between the top edge of the plate surface of the baffle plate and the top wall of the first shell so as to allow liquid to overflow; optionally, the slope is located at the degassing separation zone and the storage zone and slopes downward in a direction from the degassing separation zone to the storage zone; optionally, the apparatus further comprises an evacuator and a liquid sulfur product pump; the evacuator is provided with a suction inlet, a low-pressure steam inlet and a suction outlet; the suction inlet is communicated with a deaerated exhaust gas outlet of the first shell, the low-pressure steam inlet is communicated with a steam source, and the suction outlet is used for being communicated with an exhaust gas aftertreatment device; the bottom of the storage area of the liquid sulfur tank is provided with a concave liquid storage tank, a suction point of the liquid sulfur product pump is arranged in the liquid storage tank and is close to the second end wall, and the suction point is communicated with an input end pipeline of the liquid sulfur product pump through a liquid sulfur product outlet of the first shell; the output end of the liquid sulfur product pump is communicated with a liquid sulfur product post-treatment device; preferably, the liquid sulfur tank is made of carbon steel or stainless steel; the liquid sulfur cooler is made of stainless steel; optionally, the liquid sulfur product pump is a submerged pump or a self-priming pump, and a filter is arranged at the suction point of the liquid sulfur product pump; optionally, a heat preservation device is further arranged outside the evacuator.
Optionally, the apparatus further comprises a deaerated air preheater; the deaeration air preheater is provided with a heat source inlet, a deaeration air preheating inlet and a deaeration air preheating outlet; the heat source inlet is used for being communicated with a heat source, the deaeration air preheating inlet is used for being communicated with a Claus fan and used for enabling the heat source to exchange heat with deaeration air to obtain preheated deaeration air; the degassing air preheating outlet is communicated with a degassing air inlet of the degassing air distributor through the degassing air inlet lead-in line; optionally, an insulation layer is further arranged at the bottom of the first shell, and the insulation layer is provided with a steam inlet and a condensate outlet and is used for insulating materials in the first shell; the heat source of the heat preservation layer is low-pressure steam or hot oil.
A second aspect of the present disclosure provides a liquid sulfur degassing process comprising the steps of: respectively introducing liquid sulfur to be degassed and a cooling medium into a liquid sulfur cooler for first heat exchange treatment to obtain low-temperature liquid sulfur to be degassed and a preheated cooling medium; introducing deaerated air into a liquid sulfur tank; the low-temperature liquid sulfur to be degassed enters the liquid sulfur tank and contacts degassing air in the liquid sulfur tank to be degassed, so that degassed liquid sulfur and sulfide-containing gas are obtained; wherein a low-temperature liquid sulfur outlet to be degassed of the liquid sulfur cooler is arranged in the liquid sulfur tank.
Optionally, the liquid sulfur tank is provided with a first end wall and a second end wall which are correspondingly arranged at two ends of the liquid sulfur tank, the bottom edge of the first end wall is higher than the bottom edge of the second end wall in level to form a gradient along the direction from the first end wall to the second end wall, the low-temperature liquid sulfur outlet to be degassed is close to the first end wall, and the degassing air distributor is close to the second end wall; the method further comprises the steps of: flowing the low-temperature liquid sulfur to be degassed out of the liquid sulfur cooler into the liquid sulfur tank through the low-temperature liquid sulfur outlet; then flowing along the gradient of the liquid sulfur tank to the degassing air distributor, and contacting with the degassing air to carry out the degassing; wherein the conditions under which the low-temperature liquid sulfur to be degassed is contacted with the degassing air include: the degassing time is 4-24 hours, the degassing temperature is 125-138 ℃, the working pressure is 5-5 KPag, and the design pressure is 0.5-1.0 MPag; the volume ratio of the air volume sprayed by the degassing air distributor to the volume of the low-temperature liquid sulfur to be degassed entering the liquid sulfur tank after being cooled by the liquid sulfur cooler is (40-400): 1.
Optionally, the method further comprises: passing said deaerated air into a deaerated air distributor and then into said liquid sulfur tank via said deaerated air distributor; and flowing the degassed liquid sulfur from the air degassing distributor to a liquid sulfur product pump along a slope of the liquid sulfur tank; optionally, a baffle is further arranged between the degassing air distributor and the liquid sulfur product pump, a degassing separation area is formed between the first end wall and the baffle, and a storage area is formed between the second end wall and the baffle; the method further comprises the steps of: flowing said degassed liquid sulfur along said slope from said degassing separator to said baffle within said degassing separation zone; overflowing said degassed liquid sulfur into said storage zone via a top edge of said baffle; discharging the degassed liquid sulfur in the storage zone from the liquid sulfur tank via a liquid sulfur product pump; optionally, the H 2 S concentration in the liquid sulfur at the outlet of the liquid sulfur product pump is 5-10 ppmwt, and the outlet pressure is 0.1-1.0 MPag.
Optionally, the method further comprises: introducing the liquid sulfur to be degassed into a shell side of the liquid sulfur cooler, introducing the cooling medium into a tube side of the liquid sulfur cooler, and performing the first heat exchange treatment to obtain the low-temperature liquid sulfur to be degassed and a preheated cooling medium; enabling the low-temperature liquid sulfur to be degassed to flow out of the tube side through the low-temperature liquid sulfur outlet to enter the liquid sulfur tank; wherein the temperature of the liquid sulfur to be degassed is 130-170 ℃, the H 2 S content is below 1000ppmwt, and the pressure is 5-45 KPag; the temperature of the cooling medium is 100-120 ℃, the pressure is 0.1-2.0 MPag, and optionally, the cooling medium is one or more of boiler feed water, condensation water and low-temperature hot water; optionally, the temperature of the low-temperature liquid sulfur to be degassed is 130-150 ℃ and the pressure is 15-30 KPag.
Optionally, the method further comprises: introducing the deaerated air and a heat source into a deaerated air preheater respectively, and performing second heat exchange treatment on the deaerated air and the heat source to obtain deaerated air after preheating; introducing the preheated deaerated air into the deaerated air distributor; and delivering the degassed liquid sulfur to a liquid sulfur product post-treatment device via the liquid sulfur product pump; delivering the sulfide-containing gas to an exhaust aftertreatment device via an evacuator; optionally, the temperature of an air outlet of the deaeration air preheater is 130-170 ℃, and optionally, the heat source is low-pressure steam or medium-pressure steam; optionally, the outlet pressure of the evacuator is 10-150 KPag, and the steam source of the evacuator is low-pressure steam or medium-pressure steam.
Through the technical scheme, the liquid sulfur degassing device and method are provided, the liquid sulfur degassing process flow is simplified, the occupied area is saved, and the device investment is reduced; the vertical liquid sulfur cooler equipment structure is adopted to replace the traditional vapor-producing liquid sulfur cooler, the equipment manufacturing difficulty is reduced, meanwhile, the liquid sulfur cooler extends into the liquid sulfur tank, the liquid sulfur to be degassed can be subjected to heat exchange cooling under the action of gravity in the liquid sulfur cooler, the obtained low-temperature liquid sulfur to be degassed can directly enter the liquid sulfur tank for degassing treatment after flowing out of the cooler, a power system such as a conveying pump is not required to be additionally arranged, the device integration level can be improved, the device scale is reduced, and the energy consumption of power transmission is greatly reduced; the present disclosure also uses a cooling medium to cool the liquid sulfur, and can recover heat released during the cooling process during the liquid sulfur degassing process.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a liquid sulfur degasser provided by the present disclosure;
FIG. 2 is a schematic diagram of the apparatus structure of the liquid sulfur cooler provided by the present disclosure;
fig. 3 is a process flow diagram for the degassing of liquid sulfur in a comparative example of the present disclosure.
Description of the reference numerals
1-Liquid sulfur cooler, 2-liquid sulfur tank, 3-degassing air preheater, 4-degassing air distributor, 5-evacuator, 6-liquid sulfur product pump, 7-baffle plate, 8-heat exchange tube and 9-baffle plate
S1-liquid sulfur to be degassed, S1-1-low temperature liquid sulfur to be degassed; s2-cooling medium, S3-heat exchange post-cooling medium, S4-deaerated air (from a Claus blower), S5-pre-heated post-deaerated air, S6-sulphide-containing gas (waste gas), S7-steam source, S8-sulphide-containing gas (waste gas), S9-deaerated liquid sulphur (liquid sulphur product)
10-Liquid sulfur cooler, 11-liquid sulfur tank, 12-degassing air preheater, 13-first degassing air distributor, 14-second degassing air distributor, 15-evacuator, 16-liquid sulfur circulating pump, 17-liquid sulfur product pump, 18-first baffle, 19-second baffle, A-first degassing zone, B-second degassing zone, C-circulating separation zone
S10-liquid sulfur to be degassed, S11-circulating liquid sulfur after cooling, S12-boiler feed water, S13-exhaust steam, S14-degassing air, S15-preheated degassing air, S16-sulfide-containing gas (waste gas), S17-steam source, S18-sulfide-containing gas (waste gas), S19-degassed liquid sulfur (liquid sulfur product), S20-circulating liquid sulfur, S21-low pressure steam, S22-condensed water
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
In the present disclosure, unless otherwise indicated, the terms "first," "second," "third," and the like are used merely to distinguish between different components and do not have the actual meaning of a tandem connection sequence. In this disclosure, terms such as "upper" and "lower" are used to refer to the upper and lower portions of the device in normal use, and "inner" and "outer" are used with respect to the device profile.
A first aspect of the present disclosure provides a liquid sulfur degassing apparatus, as shown in fig. 1, comprising a liquid sulfur cooler 1 and a liquid sulfur tank 2; the liquid sulfur tank 2 comprises a first shell, and the liquid sulfur cooler 1 comprises a second shell which is vertical; wherein the second shell of the liquid sulfur cooler 1 penetrates the first shell from above the liquid sulfur tank 2 and extends towards the inside of the liquid sulfur tank 2, so that the second shell comprises an outer shell positioned outside the first shell and an inner shell positioned inside the first shell; the liquid sulfur cooler 1 comprises a shell side and a tube side, wherein the tube side is provided with a cooling medium inlet and a preheated cooling medium outlet, and the cooling medium inlet and the preheated cooling medium outlet are respectively positioned outside the first shell; the shell side is provided with a liquid sulfur inlet to be cooled and a low-temperature liquid sulfur outlet to be degassed, and the low-temperature liquid sulfur outlet to be degassed is arranged on the inner shell of the second shell, so that the shell side is in fluid communication with the interior of the liquid sulfur tank 2.
The liquid sulfur degassing device provided by the disclosure simplifies the liquid sulfur degassing process flow, saves large occupied area and reduces device investment; the vertical liquid sulfur cooler equipment structure is adopted to replace the traditional vapor-producing liquid sulfur cooler, the equipment manufacturing difficulty is reduced, meanwhile, the liquid sulfur cooler extends into the liquid sulfur tank, the liquid sulfur to be degassed can be subjected to heat exchange cooling under the action of gravity in the liquid sulfur cooler, the obtained low-temperature liquid sulfur to be degassed can directly enter the liquid sulfur tank for degassing treatment after flowing out of the cooler, a power system such as a conveying pump is not required to be additionally arranged, the device integration level can be improved, the device scale is reduced, and the energy consumption of power transmission is greatly reduced; the present disclosure also uses a cooling medium to cool the liquid sulfur, and can recover heat released during the cooling process during the liquid sulfur degassing process.
In the present disclosure, the liquid sulfur to be degassed introduced into the liquid sulfur cooler comes from an upstream multistage liquid sulfur condensing device.
In one embodiment, referring to FIG. 2, the liquid sulfur cooler 1 comprises a plurality of baffles 7 and heat exchange tubes 8; the heat exchange tube 8 extends along the axial direction of the liquid sulfur cooler 1;
wherein, the inlet of the heat exchange tube 8 is arranged on the outer shell of the second shell to form a cooling medium inlet, and the outlet of the heat exchange tube 8 is arranged on the outer shell of the second shell to form a preheated cooling medium outlet; the space in the heat exchange tube 8 is formed into a tube side;
The liquid sulfur inlet to be cooled is arranged on the inner shell of the second shell and extends to the outside of the first shell through the liquid sulfur conveying pipeline to be degassed; or the sulfur inlet of the liquid to be cooled is positioned on the outer shell of the second shell;
the liquid sulfur inlet to be cooled and the low-temperature liquid sulfur outlet to be degassed are respectively communicated with the interior of the second shell so as to form a shell pass between the outer wall of the heat exchange tube and the inner wall of the second shell;
The low-temperature liquid sulfur outlet to be degassed is arranged at the bottom of the second shell, the liquid sulfur inlet to be cooled is arranged above the low-temperature liquid sulfur outlet to be degassed, and the baffle plate 7 is arranged between the liquid sulfur inlet to be cooled and the low-temperature liquid sulfur outlet to be degassed.
Specifically, as shown in fig. 2, two broken lines in the drawing represent the top wall and the bottom wall of the first housing of the liquid sulfur tank 2, respectively, and the space between the two broken lines represents the first housing inner space of the liquid sulfur tank 2. In fig. 2 the cooling medium S2 enters the tube side of the liquid sulfur cooler 1 via a cooling medium inlet at the top of the second housing, and the liquid sulfur S1 to be cooled enters the shell side of the liquid sulfur cooler 1 via a liquid sulfur inlet to be cooled on the side wall of the second housing extending into the interior of the liquid sulfur tank 2; in the liquid sulfur cooler 1, liquid sulfur to be cooled flows through a plurality of baffle plates 7 from top to bottom along the vertical direction and exchanges heat with cooling medium in a heat exchange tube 8; the preheated cooling medium S3 after heat exchange flows out from the preheated cooling medium outlet at the top of the second shell, and can be introduced into other devices to further recover heat energy, and the low-temperature liquid sulfur S1-1 to be degassed directly enters the liquid sulfur tank 2 from the low-temperature liquid sulfur outlet at the bottom of the second shell. In fig. 2, a cooling liquid sulfur inlet is provided inside the liquid sulfur tank 2, in which case, in connection with fig. 1, the cooling liquid sulfur inlet extends outside the first housing through a transfer line for liquid sulfur to be treated for introducing liquid sulfur generated by an upstream device. In another case, the cooling liquid sulfur inlet may be provided on a second housing (not shown) located outside the liquid sulfur tank 2, in which case the cooling liquid sulfur inlet is introduced into the liquid sulfur generated by the upstream apparatus through a transfer line of the liquid sulfur to be treated, and the line is not required to be reintroduced into the liquid sulfur tank 2.
In an alternative embodiment, as shown in fig. 2, a plurality of baffles 7 are fixed on the side wall of the second shell at intervals along the axial direction of the liquid sulfur cooler 1, and the plate surface of each baffle 7 is perpendicular to the side wall of the second shell; alternatively, the plurality of baffles 7 are arranged on the side wall of the second casing at intervals along the axial direction of the second casing, so that the plurality of baffles 7 form spiral liquid flow passages from top to bottom. In the method, the baffle plates in the liquid sulfur cooler are arranged in a spiral shape from top to bottom, so that the liquid sulfur to be degassed can move in the liquid sulfur cooler in a spiral shape from top to bottom and exchange heat with the cooling medium in the heat exchange tube 8, and the heat exchange efficiency of the liquid sulfur to be degassed is improved.
Alternatively, the size of the baffles 7, as well as the spacing of the different baffles 7, may be adjusted according to the circumstances. It is preferable that the ratio of the length of the second housing of the liquid sulfur cooler 1 extending into the interior of the liquid sulfur tank 2 to the height of the liquid sulfur tank is (0.3 to 0.6): 1.
In a preferred embodiment, the preheated cooling medium outlet of the liquid sulfur cooler 1 can be communicated with a sulfur condenser, so that the preheated cooling medium is introduced into the liquid sulfur condenser to further generate steam, heat released in the cooling process is recovered, and heat energy is fully utilized.
In one embodiment, as shown in fig. 1, the apparatus further comprises a degassing air distributor 4, wherein the degassing air distributor 4 is arranged in the first shell and is positioned at the bottom of the first shell; the degassing air distributor 4 is close to a low-temperature liquid sulfur outlet to be degassed of the liquid sulfur cooler 1; optionally, a plurality of degassing air distributors 4 are provided in the first housing;
The degassing air distributor 4 is provided with a degassing air inlet which extends to the outside of the first housing through a degassing air introduction line and communicates with a degassing air input source;
The first shell is a horizontal cylindrical shell; the first shell comprises a first end wall and a second end wall which are oppositely arranged, and the first end wall is close to the liquid sulfur cooler 1; the bottom wall of the liquid sulfur tank 2 has a slope inclined downward in the direction from the first end wall to the second end wall, alternatively, the slope is 1 to 5%. The liquid sulfur tank is provided with the gradient, and the liquid sulfur tank can be cooperatively applied with a liquid sulfur cooler vertically extending into the liquid sulfur tank, so that the liquid sulfur to be degassed at low temperature flows out and then is easier to contact with degassing air under the action of the gradient, and the efficiency is further improved.
In an alternative embodiment, the first shell is further provided with a liquid sulfur product outlet and a degassing waste gas outlet, the liquid sulfur product outlet and the degassing waste gas outlet are respectively arranged at the top of the first shell, the liquid sulfur product outlet is close to the second end wall of the first shell, and the degassing waste gas outlet is arranged between the liquid sulfur product outlet and the pipeline opening of the degassing air introducing pipeline.
In the present disclosure, deaerated air distributor 4 is a device of conventional choice in the art.
In a specific embodiment, as shown in fig. 1, a plurality of degassing air distributors 4 are arranged in the first shell, degassing air inlets of each degassing air distributor are correspondingly provided with degassing air inlet pipelines, and pipeline openings matched with the plurality of degassing air inlet pipelines are arranged on the top wall of the first shell where the liquid sulfur tank 2 is arranged; and all of the inlet ends of the deaerated air intake pipes may be integrated into the same main line.
In one embodiment, as shown in fig. 1, the device further comprises a baffle plate 9, wherein the baffle plate 9 is arranged on the bottom wall of the first shell and is close to the second end wall, the plate surface of the baffle plate 9 is perpendicular to the bottom wall of the first shell, and the bottom edge of the baffle plate 9 is fixedly connected with the first shell; to form a degassing separation zone between the first end wall and the baffle 9 and a storage zone between the second end wall and the baffle 9; the inner shell of the liquid sulfur cooler 1 and the degassing air distributor 4 are arranged in a degassing separation zone, and a degassing waste gas outlet is arranged on the top wall of the degassing separation zone and is close to a baffle 9; the liquid sulfur product outlet is arranged on the top wall of the storage area; a space is provided between the top edge of the plate surface of the baffle plate 9 and the top wall of the first shell to allow the liquid to overflow; optionally, the slope is located in the degassing separation zone and the storage zone and slopes downward in the direction from the degassing separation zone to the storage zone.
In one embodiment, as shown in FIG. 1, the apparatus further comprises an evacuator 5 and a liquid sulfur product pump 6; the evacuator 5 is provided with a suction inlet, a low pressure steam inlet and a suction outlet; the suction inlet is communicated with a deaerated waste gas outlet of the first shell, the low-pressure steam inlet is communicated with a steam source, and the suction outlet is used for being communicated with a waste gas aftertreatment device;
The bottom of the storage area of the liquid sulfur tank 2 is provided with a concave liquid storage tank, a suction point of the liquid sulfur product pump 6 is arranged in the liquid storage tank and is close to the second end wall, and the suction point is communicated with an input end pipeline of the liquid sulfur product pump 6 through a liquid sulfur product outlet of the first shell; the output end of the liquid sulfur product pump 6 is used for communicating with a liquid sulfur product post-treatment device. In the present disclosure, for the degassed exhaust gas and the degassed liquid sulfur obtained after the degassing treatment, the evacuator 5 and the liquid sulfur product pump 6 are used for pumping, and the degassed exhaust gas outlet and the liquid sulfur product outlet are respectively arranged in the degassing separation area and the storage area, and the degassed liquid sulfur overflows from the degassing separation area to the storage area through the top edge of the plate surface of the baffle plate 9, so that the exhaust gas and the degassed liquid sulfur are prevented from being mixed. And the degassing liquid sulfur is pumped out by the liquid sulfur product pump 6 and then is introduced into a subsequent treatment device, such as a sulfur forming device or a liquid sulfur tank area, and the like, without circulating treatment, so that the liquid sulfur circulating flow is canceled, and the energy consumption of the device is reduced. Specifically, as shown in fig. 1, in the present disclosure, the liquid sulfur tank 2 has a gradient in a direction from the first end wall to the second end wall, so that the degassed liquid sulfur obtained in the degassing and separating zone of the liquid sulfur tank can continue to move in a direction from the second end wall along the gradient of the liquid sulfur tank, and after the liquid level of the degassed liquid sulfur can exceed the top edge of the plate surface of the baffle plate 9, the degassed liquid sulfur in the degassing and separating zone automatically overflows into the storage zone of the liquid sulfur tank through a gap above the baffle plate 9, and is then pumped out by the liquid sulfur product pump 6 and sent to a subsequent treatment device; the waste gas (H 2 S-containing gas) obtained in the degassing and separating zone is pumped out of the liquid sulfur tank through the evacuator 5 and is sent to a subsequent treatment system, and the waste gas at the top of the liquid sulfur tank can be pumped at any time through the evacuator 5, so that the concentration of H 2 S in the upper space of the liquid sulfur tank can be ensured to be lower than the explosion limit, and the safety of the device is improved.
In a preferred embodiment, the liquid sulfur tank 2 is made of carbon steel or stainless steel; the liquid sulfur cooler 1 is made of stainless steel; optionally, the liquid sulfur product pump 6 is a submerged pump or a self-priming pump, and a filter is arranged in the suction of the liquid sulfur product pump 6; optionally, a heat-insulating device is arranged outside the evacuator 5, preferably in a jacket structure, and heat is insulated by introducing steam into the jacket structure. The liquid sulfur tank with the metal structure is adopted to replace a liquid sulfur tank with a structure of 'concrete + acid-resistant brick acid-resistant coating', the reliability of equipment is improved, and long-period operation of the device is ensured.
In one embodiment, as shown in fig. 1, the apparatus further comprises a deaerated air preheater 3; the deaeration air preheater 3 is provided with a heat source inlet, a deaeration air preheating inlet and a deaeration air preheating outlet; the heat source inlet is used for being communicated with a heat source, the deaeration air preheating inlet is used for being communicated with the Claus fan and used for enabling the heat source to exchange heat with deaeration air, and preheated deaeration air is obtained; the deaeration air preheating outlet is communicated with the deaeration air inlet of the deaeration air distributor 4 via a deaeration air inlet lead-in line;
Optionally, the bottom of the first shell is also provided with an insulating layer, and the insulating layer is provided with a steam inlet and a condensate outlet and is used for insulating materials in the first shell; the heat source of the heat preservation layer is low-pressure steam or hot oil.
In this disclosure, deaerated air preheater 3, evacuator 5, and liquid sulfur product pump 6 are all devices of choice conventionally in the art.
A second aspect of the present disclosure provides a liquid sulfur degassing method, as shown in fig. 1, comprising the steps of:
Respectively introducing liquid sulfur to be degassed and a cooling medium into a liquid sulfur cooler 1 for first heat exchange treatment to obtain low-temperature liquid sulfur to be degassed and a preheated cooling medium;
Introducing deaerated air into a liquid sulfur tank 2; the low-temperature liquid sulfur to be degassed enters the liquid sulfur tank 2 and is contacted with degassing air in the liquid sulfur tank 2 for degassing to obtain degassed liquid sulfur and sulfide-containing gas; wherein the low-temperature liquid sulfur outlet to be degassed of the liquid sulfur cooler 1 is arranged in the liquid sulfur tank 2.
In the liquid sulfur degassing process, a cooling medium is adopted to cool liquid sulfur, and heat released in the cooling process is recovered; the liquid sulfur circulation flow is canceled, and the energy consumption of the device is reduced; simplifying the liquid sulfur degassing process flow, saving large occupied area and reducing the investment of the device. The low-temperature liquid sulfur to be degassed of the liquid sulfur cooler 1 is arranged in the liquid sulfur tank, so that the low-temperature liquid sulfur to be degassed can directly enter the liquid sulfur tank, and is not required to be conveyed into the liquid sulfur tank after being cooled outside the liquid sulfur tank, the process flow is simplified, and the energy consumption is reduced.
In a preferred embodiment, the H 2 S content in the liquid sulfur to be degassed is 1000ppmwt or less; the content of H 2 S in the degassed liquid sulfur is below 10 ppmwt.
In one embodiment, as shown in fig. 1, the liquid sulfur tank 2 has a first end wall and a second end wall which are correspondingly arranged at two ends of the liquid sulfur tank 2, the bottom edge of the first end wall is higher than the bottom edge of the second end wall in level to form a gradient along the direction from the first end wall to the second end wall, the low-temperature liquid sulfur outlet to be degassed is close to the first end wall, and the degassing air distributor 4 is close to the second end wall; the method further comprises the steps of:
Flowing the low-temperature liquid sulfur to be degassed out of the liquid sulfur cooler 1 into the liquid sulfur tank 2 through the low-temperature liquid sulfur outlet; then flowing along the gradient of the liquid sulfur tank 2 to the degassing air distributor 4, and contacting with the degassing air to carry out the degassing;
Wherein the conditions under which the low-temperature liquid sulfur to be degassed is contacted with the degassing air include: the degassing time is 4-24 hours, the degassing temperature is 125-138 ℃, the working pressure is 5-5 KPag, and the design pressure is 0.5-1.0 MPag; the volume ratio of the air volume of the air jet of the degassing air distributor 4 to the volume of the low-temperature liquid sulfur to be degassed entering the liquid sulfur tank 2 after being cooled by the liquid sulfur cooler 1 is (40-400): 1.
In one embodiment, as shown in fig. 1, the method further comprises: passing the deaerated air into a deaerated air distributor 4 and then into the liquid sulfur tank 2 via the deaerated air distributor 4; and
The degassed liquid sulfur is caused to flow from the air degassing distributor 4 along the slope of the liquid sulfur tank 2 to a liquid sulfur product pump 6.
In an alternative embodiment, a baffle 9 is further arranged between the degassing air distributor 4 and the liquid sulfur product pump 6, a degassing separation area is formed between the first end wall and the baffle 9, and a storage area is formed between the second end wall and the baffle 9; the method further comprises the steps of:
Flowing said degassed liquid sulfur along said slope from said degassing separator 4 to said baffle 9 in said degassing separation zone;
overflowing said degassed liquid sulfur into said storage zone via the top edge of said baffle 9; discharging the degassed liquid sulfur in the storage zone from the liquid sulfur tank 2 via a liquid sulfur product pump 6;
optionally, the H 2 S concentration in the liquid sulfur at the outlet of the liquid sulfur product pump 6 is 5 to 10ppmwt, and the outlet pressure is 0.1 to 1.0MPag.
In one embodiment, as shown in fig. 2, the method further comprises: introducing the liquid sulfur to be degassed into a shell side of the liquid sulfur cooler 1, introducing the cooling medium into a tube side of the liquid sulfur cooler 1, and performing the first heat exchange treatment to obtain the low-temperature liquid sulfur to be degassed and a preheated cooling medium; the low-temperature liquid sulfur to be degassed flows out of the tube side through the low-temperature liquid sulfur outlet to be degassed and enters the liquid sulfur tank 2;
Wherein the temperature of the liquid sulfur to be degassed is 130-170 ℃, the H 2 S content is below 1000ppmwt, and the pressure is 5-45 KPag; the inlet temperature of the cooling medium is 100-120 ℃, the pressure is 0.1-2.0 MPag, and optionally, the cooling medium is one or more of boiler feed water, condensation water and low-temperature hot water; optionally, the temperature of the low-temperature liquid sulfur to be degassed is 130-150 ℃ and the pressure is 15-30 KPag.
In one embodiment, as shown in fig. 1, the method further comprises: introducing deaerated air and a heat source into a deaerated air preheater 3 respectively, and performing second heat exchange treatment on the deaerated air and the heat source to obtain preheated deaerated air; introducing the preheated deaerated air into the deaerated air distributor 4; and
Delivering the degassed liquid sulfur to a liquid sulfur product post-treatment device via the liquid sulfur product pump 6; delivering the sulfide-containing gas to an exhaust gas aftertreatment device via an evacuator 5;
optionally, the temperature of the air outlet of the deaeration air preheater 3 is 130-170 ℃, and optionally, the heat source is low-pressure steam or medium-pressure steam;
Optionally, the outlet pressure of the evacuator 5 is 10-150 KPag, and the steam source of the evacuator 5 is low-pressure steam or medium-pressure steam.
The present disclosure is further described below by way of examples with reference to the accompanying drawings, but the present disclosure is not limited to the following examples only.
Without being specifically described, each component and equipment related to the embodiment of the disclosure are general equipment conventional in industry, or equipment which can be purchased directly in the market, so that the use requirements in the chemical industry field can be met.
Example 1
The liquid sulfur degassing process shown in fig. 1 and 2 specifically comprises the following steps:
(1) The H 2 S-enriched liquid sulfur S1 to be degassed from the upstream liquid sulfur condenser is allowed to flow into the shell side of the liquid sulfur cooler 1 automatically through a liquid sulfur inlet to be cooled, and the cooling medium S2 is allowed to flow into the tube side of the liquid sulfur cooler 1 through a cooling medium inlet. The liquid sulfur to be degassed moves from top to bottom along a baffle 7 arranged in a spiral way on the shell side of the liquid sulfur cooler 1 and performs first heat exchange treatment with a cooling medium (low-pressure boiler water supply) in a heat exchange tube 8, so that the temperature of the liquid sulfur is reduced, the solubility of H 2 S in the liquid sulfur is reduced, and the low-temperature liquid sulfur to be degassed and the preheated cooling medium are obtained.
Wherein the temperature of the liquid sulfur S1 to be degassed introduced by the liquid sulfur cooler 1 is 166.8 ℃, the pressure is 23.5KPag, and the temperature of the low-temperature liquid sulfur S1-1 to be degassed after cooling is 136 ℃; the inlet temperature of the cooling medium boiler feed water S2 introduced by the liquid sulfur cooler 1 is 104 ℃, the pressure is 1.0MPag, and the outlet temperature of the preheated cooling medium S3 is 108.8 ℃;
(2) The inside of the liquid sulfur tank 2 is provided with two degassing air distributors 4, so that the degassing air S4 from a fan is preheated by a degassing air preheater 3 and then is divided into two paths to enter the liquid sulfur tank 2 to be respectively communicated with one degassing air distributor 4, the temperature of an air outlet S5 of the degassing air preheater is 136 ℃, the heating medium of the preheater is low-pressure steam, and the temperature is 148 ℃ and the pressure is 0.35MPag; the preheated degassing air S5 is sprayed into the liquid sulfur tank 2 through a degassing air distributor 4 at the bottom of the liquid sulfur tank 2 (the total air spraying flow rate of the degassing air distributor 4 is 891kg/h, and the ratio of the sprayed air volume to the liquid sulfur volume entering the liquid sulfur tank 2 after cooling is 125:1);
(3) Allowing the low-temperature liquid sulfur S1-1 to be degassed after cooling in the step (1) to automatically flow into a liquid sulfur tank 2, wherein the liquid sulfur tank 2 has a gradient of 1-5%o, the low-temperature liquid sulfur to be degassed flows to a degassing air distributor 4 along with the gradient, the low-temperature liquid sulfur is fully contacted with degassing air S5 in the liquid sulfur tank 2 for degassing (when the degassing time is 12, the degassing temperature is 138 ℃), the degassing air S5 blows out H 2 S and polysulfide dissolved in the low-temperature liquid sulfur to be degassed, part of H 2 S is oxidized into elemental sulfur, and meanwhile, the concentration of H 2 S at the upper space of the liquid sulfur tank 2 is ensured to be lower than an explosion limit, so that the degassing liquid sulfur and sulfide-containing gas are obtained; the degassed liquid sulfur continues to overflow along the gradient and flows to one end of the liquid sulfur product pump 6 through the baffle plate 9;
(4) The degassed liquid sulfur S9 obtained in the step (3) is taken as a liquid sulfur product, is boosted by a liquid sulfur product pump 6 and then is sent to a sulfur forming device or a liquid sulfur tank area for post treatment, wherein the concentration of H 2 S in the liquid sulfur product is 7ppmwt, and the pressure is 0.6MPag;
(5) The degassing waste gas S6 containing H 2 S and sulfur vapor in the liquid sulfur tank 2 in the step (3) is pumped out by an evacuator 5, the waste gas S8 is sent to a tail gas incinerator, the outlet pressure of the evacuator is 25KPag, the power source is low-pressure steam S7, the temperature is 148 ℃, and the pressure is 0.35MPag. Wherein, low-pressure steam S21 can be introduced into the bottom of the liquid sulfur tank 2 for heat preservation, and condensate S22 is obtained and sent to a condensate pipe network.
The properties of the liquid sulfur S1 to be degassed employed in this example in each stage of sulfur condenser are shown in Table 1 below; the composition and properties of the liquid sulfur product and the exhaust gas discharged after the degassing by the above method are shown in the following Table 2, S 1～S8 in tables 1 and 2 represents the types of elemental sulfur molecular crystals, and S1, S8 and S9 represent the materials involved in the liquid sulfur degassing flow in example 1.
TABLE 1
TABLE 2
As can be seen from the table, comparing the stream S1 to be degassed before treatment with the liquid sulfur product S9 after degassing treatment shows that the molar flow rate of H 2 S in the liquid sulfur product S9 is reduced by 96.8%, and the H2S content in the liquid sulfur is reduced by 97.4%, which indicates that the device and the method provided by the application can effectively reduce and remove gases such as hydrogen sulfide in the liquid sulfur.
Comparative example 1
The comparative example adopts the traditional liquid sulfur degassing flow shown in fig. 3, and specifically comprises the following steps:
(1) A first degassing air distributor 13 and a second degassing air distributor 14 are arranged in the liquid sulfur pool, so that the degassing air S14 from a fan is preheated by a degassing air preheater 12 and then enters the liquid sulfur pool 11 in two paths to be respectively communicated with one degassing air distributor, and the preheated degassing air S15 is sprayed into the liquid sulfur pool 11 through the degassing air distributor at the bottom of the liquid sulfur pool 11;
(2) Allowing H 2 S-enriched liquid sulfur S10 to be degassed from an upstream liquid sulfur condenser to enter a first degassing zone A in the liquid sulfur tank through a liquid sulfur inlet to be degassed on the liquid sulfur tank; the liquid sulfur inlet to be degassed is arranged above the first degassing air distributor 13, so that the liquid sulfur S10 to be degassed is contacted with degassing air sprayed by the first degassing air distributor 13 and is subjected to first degassing treatment; overflowing the obtained degassed liquid sulfur into a second degassing zone B through a first baffle plate 18, contacting the obtained degassed liquid sulfur with the degassing air sprayed by a second degassing air distributor 14 in the second degassing zone B for carrying out second degassing treatment, and enabling the obtained degassed liquid sulfur to enter a circulating separation zone C of a liquid sulfur tank 11 through a second baffle plate 19;
(3) In the circulating separation zone C, the liquid sulfur circulation pump 16 sucks the deaerated liquid sulfur and sends the circulating liquid sulfur S20 to the liquid sulfur cooler 10; inputting low-pressure boiler feed water S12 into the liquid sulfur cooler 10, and enabling the circulating liquid sulfur and the low-pressure boiler feed water to exchange heat in the liquid sulfur cooler 10 to obtain cooled circulating liquid sulfur S11 and exhaust steam S13; allowing the exhaust steam S13 to enter a condensate system, and allowing the cooled circulating liquid sulfur S11 to return to the second degassing zone B through a circulating inlet at the top B of the second degassing zone of the liquid sulfur pool 11 to continue degassing;
(4) The liquid sulfur product pump 17 of the circulation separation zone C is caused to pump out and send the degassed liquid sulfur S19 of the circulation separation zone C to a subsequent treatment unit (e.g., a liquid sulfur forming unit), and the evacuator 15 is caused to pump out the exhaust gas S16 via an exhaust gas outlet of the top wall of the circulation separation zone, wherein the steam source S17 is introduced as motive steam to the evacuator 15, and the exhaust gas S18 sucked by the evacuator 15 is sent to the tail gas incinerator. Wherein, low-pressure steam S21 can be introduced into the bottom of the liquid sulfur pool 11 for heat preservation, and condensate S22 is obtained and sent to a condensate pipe network.
Wherein, the reflux quantity of the liquid sulfur is 39164kg/h, the outlet temperature of the circulating liquid sulfur after cooling of the liquid sulfur cooler 10 is 129.1 ℃, the heat load of the liquid sulfur cooler is 99.9kW, and 0.12MPag low-pressure dead steam is generated and sent to a condensate pipe network.
The procedure of example 1 of the present application was compared with that of comparative example 1, as shown in table 3 below.
TABLE 3 Table 3
| Project | Example 1 | Comparative example 1 |
| Liquid sulfur Chi Xingshi | Stainless steel pressure vessel | Concrete pool |
| Circulation amount of liquid sulfur (t/h) | Without any means for | 39164 |
| Liquid sulfur cooler outlet temperature (. Degree. C.) | 136 | 129 |
| Liquid sulfur cooler application | Heat recovery from water supply to heating boiler | Generating exhaust steam |
| Liquid sulfur product H 2 S concentration (ppmw) | <10 | <10 |
| Liquid sulfur cooler size mm | ID800×L2500 | ID1100×L6000 |
| Liquid sulfur circulation power consumption kW | Without any means for | 23 |
| Liquid sulfur cooler heat load kW | 102 | 99 |
| Total energy consumption kW | -102 (Recovery of heat) | 122 |
| Boiler water supply loss (kg/h) | Without any means for | 157 |
As can be seen from the comparison of the table, when the concentration of H 2 S in the obtained liquid sulfur product is below 10ppmw, compared with the process adopted in the comparative example 1, the treatment device and the treatment method provided by the embodiment 1 of the application have simple flow, reduce the number of equipment and the occupied area, realize cooling and degassing of the liquid sulfur by using fewer equipment, and ensure that the H 2 S content in the liquid sulfur product meets the standard requirement; the heat released in the cooling process of the liquid sulfur can be recovered, and the energy consumption of the device is reduced; and the liquid sulfur tank with a metal structure is adopted to replace a liquid sulfur tank of concrete, so that the on-site construction and maintenance difficulty is reduced, and the running stability of the device is improved.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (25)
1. A liquid sulfur degassing device, which is characterized by comprising a liquid sulfur cooler (1) and a liquid sulfur tank (2); the liquid sulfur tank (2) comprises a first shell, and the liquid sulfur cooler (1) comprises a vertical second shell; wherein the second shell of the liquid sulfur cooler (1) penetrates through the first shell from the upper part of the liquid sulfur tank (2) and extends towards the inside of the liquid sulfur tank (2), so that the second shell comprises an outer shell positioned outside the first shell and an inner shell positioned inside the first shell; the liquid sulfur cooler (1) comprises a shell side and a tube side, wherein the tube side is provided with a cooling medium inlet and a preheated cooling medium outlet, and the cooling medium inlet and the preheated cooling medium outlet are respectively positioned outside the first shell; the shell side is provided with a liquid sulfur inlet to be cooled and a low-temperature liquid sulfur outlet to be degassed, and the low-temperature liquid sulfur outlet to be degassed is arranged on the inner shell of the second shell so that the shell side is in fluid communication with the inside of the liquid sulfur tank (2);
The device also comprises a degassing air distributor (4), wherein the degassing air distributor (4) is arranged in the first shell and is positioned at the bottom of the first shell; the degassing air distributor (4) is close to a low-temperature liquid sulfur outlet to be degassed of the liquid sulfur cooler (1); the degassing air distributor (4) is provided with a degassing air inlet which extends to the outside of the first housing through a degassing air introduction line and is in communication with a degassing air input source;
the first shell comprises a first end wall and a second end wall which are oppositely arranged; the bottom wall of the liquid sulfur tank (2) is provided with a slope which is inclined downwards along the direction from the first end wall to the second end wall, and the slope is 1-5 per mill.
2. The device according to claim 1, characterized in that the liquid sulfur cooler (1) comprises a plurality of baffles (7) and heat exchange tubes (8); the heat exchange tube (8) extends along the axial direction of the liquid sulfur cooler (1);
Wherein an inlet of the heat exchange tube (8) is provided on an outer casing of the second casing to form the cooling medium inlet, and an outlet of the heat exchange tube (8) is provided on the outer casing of the second casing to form the preheated cooling medium outlet; the space in the heat exchange tube (8) is formed into the tube side;
the liquid sulfur inlet to be cooled is arranged on the inner shell of the second shell and extends to the outside of the first shell through the liquid sulfur conveying pipeline to be degassed; or the to-be-cooled liquid sulfur inlet is positioned on the outer shell of the second shell;
the liquid sulfur inlet to be cooled and the low-temperature liquid sulfur outlet to be degassed are respectively communicated with the interior of the second shell so as to form a shell pass between the outer wall of the heat exchange tube and the inner wall of the second shell;
the low-temperature liquid sulfur outlet to be degassed is arranged at the bottom of the second shell, the liquid sulfur inlet to be cooled is arranged above the low-temperature liquid sulfur outlet to be degassed, and the baffle plate (7) is arranged between the liquid sulfur inlet to be cooled and the low-temperature liquid sulfur outlet to be degassed.
3. The device according to claim 2, characterized in that a plurality of the baffles (7) are fixed to the side wall of the second housing at intervals in the axial direction of the liquid sulfur cooler (1), and the plate surface of each baffle (7) is perpendicular to the side wall of the second housing.
4. The device according to claim 2, characterized in that a plurality of said baffles (7) are provided at staggered intervals along the axial direction of said second housing on the side wall of said second housing so that a plurality of said baffles (7) form a spiral liquid flow path from top to bottom.
5. The apparatus of claim 1, wherein the first housing is a horizontal cylindrical housing; the first end wall is adjacent to the liquid sulfur cooler (1).
6. The apparatus according to claim 1, characterized in that a plurality of said degassing air distributors (4) are provided in said first housing.
7. The apparatus of claim 1, wherein the first housing is further provided with a liquid sulfur product outlet and a deaerated off-gas outlet, the liquid sulfur product outlet and the deaerated off-gas outlet being disposed at a top of the first housing, respectively, the liquid sulfur product outlet being proximate to the second end wall of the first housing, the deaerated off-gas outlet being disposed between the liquid sulfur product outlet and the line aperture of the deaerated air intake line.
8. The device according to claim 7, further comprising a baffle (9), said baffle (9) being disposed on the bottom wall of said first housing and adjacent to said second end wall, the plate surface of said baffle (9) being perpendicular to the bottom wall of said first housing, the bottom edge of said baffle (9) being fixedly connected to said first housing; to form a degassing separation zone between said first end wall and said baffle (9) and a storage zone between said second end wall and said baffle (9); the inner shell of the liquid sulfur cooler (1) and the degassing air distributor (4) are arranged in the degassing separation zone, and the degassing waste gas outlet is arranged on the top wall of the degassing separation zone and is close to the baffle plate (9); the liquid sulfur product outlet is arranged on the top wall of the storage area; a space is provided between the top edge of the plate surface of the baffle plate (9) and the top wall of the first shell to allow liquid to overflow.
9. The apparatus of claim 8, wherein the slope is located in the degassing separation zone and the storage zone and slopes downward in a direction from the degassing separation zone to the storage zone.
10. The apparatus according to claim 9, further comprising an evacuator (5) and a liquid sulfur product pump (6); the evacuator (5) is provided with a suction inlet, a low pressure steam inlet and a suction outlet; the suction inlet is communicated with a deaerated exhaust gas outlet of the first shell, the low-pressure steam inlet is communicated with a steam source, and the suction outlet is used for being communicated with an exhaust gas aftertreatment device;
A concave liquid storage tank is arranged at the bottom of the storage area of the liquid sulfur tank (2), a suction point of the liquid sulfur product pump (6) is arranged in the liquid storage tank and is close to the second end wall, and the suction point is communicated with an input end pipeline of the liquid sulfur product pump (6) through a liquid sulfur product outlet of the first shell; the output end of the liquid sulfur product pump (6) is communicated with a liquid sulfur product post-treatment device.
11. The device according to claim 1, characterized in that the material of the liquid sulfur tank (2) is carbon steel or stainless steel; the liquid sulfur cooler (1) is made of stainless steel.
12. The apparatus according to claim 10, characterized in that the liquid sulfur product pump (6) is a submerged pump or a self-priming pump, and that the suction point of the liquid sulfur product pump (6) is provided with a filter.
13. The device according to claim 10, characterized in that the evacuator (5) is further provided with insulation means on the outside.
14. The apparatus according to claim 1, characterized in that the apparatus further comprises a deaerated air preheater (3); the deaeration air preheater (3) is provided with a heat source inlet, a deaeration air preheating inlet and a deaeration air preheating outlet; the heat source inlet is used for being communicated with a heat source, the deaeration air preheating inlet is used for being communicated with a Claus fan and used for enabling the heat source to exchange heat with deaeration air to obtain preheated deaeration air; the degassing air preheating outlet communicates via the degassing air introduction line with a degassing air inlet of the degassing air distributor (4).
15. The device according to claim 1, wherein the bottom of the first housing is further provided with a heat-insulating layer, the heat-insulating layer being provided with a steam inlet and a condensed water outlet for insulating the material in the first housing; the heat source of the heat preservation layer is low-pressure steam or hot oil.
16. A method for degassing liquid sulfur, comprising the steps of:
Respectively introducing liquid sulfur to be degassed and a cooling medium into a liquid sulfur cooler (1) for first heat exchange treatment to obtain low-temperature liquid sulfur to be degassed and a preheated cooling medium;
Introducing deaerated air into a deaerated air distributor (4) and then into a liquid sulfur tank (2) via the deaerated air distributor (4); the low-temperature liquid sulfur to be degassed enters the liquid sulfur tank (2), flows to the degassing air distributor (4) along the gradient of the liquid sulfur tank (2), and contacts degassing air in the liquid sulfur tank (2) for degassing to obtain degassed liquid sulfur and sulfide-containing gas; wherein a low-temperature liquid sulfur outlet to be degassed of the liquid sulfur cooler (1) is arranged in the liquid sulfur tank (2);
The liquid sulfur tank (2) is provided with a first end wall and a second end wall which are correspondingly arranged at two ends of the liquid sulfur tank (2), the bottom edge of the first end wall is higher than the bottom edge of the second end wall in level to form a gradient along the direction from the first end wall to the second end wall, the low-temperature liquid sulfur outlet to be degassed is close to the first end wall, and the degassing air distributor (4) is close to the second end wall;
The conditions under which the low-temperature liquid sulfur to be degassed is contacted with the degassing air include: the degassing time is 4-24 hours, the degassing temperature is 125-138 ℃, the working pressure is 5-5 KPaG, and the design pressure is 0.5-1.0 MPaG.
17. The method of claim 16, further comprising:
flowing the low-temperature liquid sulfur to be degassed out of the liquid sulfur cooler (1) into the liquid sulfur tank (2) through the low-temperature liquid sulfur outlet;
The volume ratio of the volume of air sprayed by the degassing air distributor (4) to the volume of low-temperature liquid sulfur to be degassed entering the liquid sulfur tank (2) after being cooled by the liquid sulfur cooler (1) is (40-400): 1.
18. The method of claim 16, further comprising: the degassed liquid sulfur is caused to flow from the degassing air distributor (4) to a liquid sulfur product pump (6) along the slope of the liquid sulfur tank (2).
19. The method according to claim 18, characterized in that a baffle (9) is also provided between the degassing air distributor (4) and the liquid sulfur product pump (6), a degassing separation zone being formed between the first end wall and the baffle (9), and a storage zone being formed between the second end wall and the baffle (9); the method further comprises the steps of:
Flowing said degassed liquid sulfur along said slope from said degassing air distributor (4) to said baffle (9) in said degassing separation zone;
Overflowing said degassed liquid sulfur into said storage zone via a top edge of said baffle (9); the degassed liquid sulfur in the storage zone is discharged from the liquid sulfur tank (2) through a liquid sulfur product pump (6).
20. The method according to claim 19, wherein the concentration of H 2 S in the liquid sulfur at the outlet of the liquid sulfur product pump (6) is 5 to 10ppmwt and the outlet pressure is 0.1 to 1.0mpag.
21. The method of claim 16, further comprising:
Introducing the liquid sulfur to be degassed into a shell side of the liquid sulfur cooler (1), introducing the cooling medium into a tube side of the liquid sulfur cooler (1), and performing the first heat exchange treatment to obtain the low-temperature liquid sulfur to be degassed and a preheated cooling medium; enabling the low-temperature liquid sulfur to be degassed to flow out of the tube side through the low-temperature liquid sulfur outlet to enter the liquid sulfur tank (2);
Wherein the temperature of the liquid sulfur to be degassed is 130-170 ℃, the H 2 S content is below 1000ppmwt, and the pressure is 5-45 KPaG; the inlet temperature of the cooling medium is 100-120 ℃, the pressure is 0.1-2.0 MPaG, and the cooling medium is one or more of boiler feed water, condensation water and low-temperature hot water; the temperature of the low-temperature liquid sulfur to be degassed is 130-150 ℃, and the pressure is 15-30 KPaG.
22. The method of claim 18, further comprising:
introducing deaerated air and a heat source into a deaerated air preheater (3) respectively, and performing second heat exchange treatment on the deaerated air and the heat source to obtain preheated deaerated air; introducing the preheated deaerated air into the deaerated air distributor (4); and
Delivering the degassed liquid sulfur to a liquid sulfur product post-treatment device via the liquid sulfur product pump (6); the sulfide-containing gas is conveyed via an evacuator (5) to an exhaust gas aftertreatment device.
23. The method according to claim 22, characterized in that the air outlet temperature of the deaerated air preheater (3) is 130-170 ℃.
24. The method of claim 22, wherein the heat source is low pressure steam or medium pressure steam.
25. The method according to claim 22, wherein the outlet pressure of the evacuator (5) is 10-150 kpa g, and the steam source of the evacuator (5) is low pressure steam or medium pressure steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111016749.1A CN115724407B (en) | 2021-08-31 | 2021-08-31 | Liquid sulfur degassing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111016749.1A CN115724407B (en) | 2021-08-31 | 2021-08-31 | Liquid sulfur degassing device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115724407A CN115724407A (en) | 2023-03-03 |
| CN115724407B true CN115724407B (en) | 2024-07-16 |
Family
ID=85291704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111016749.1A Active CN115724407B (en) | 2021-08-31 | 2021-08-31 | Liquid sulfur degassing device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115724407B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2014103043A (en) * | 2014-01-29 | 2015-08-10 | Игорь Анатольевич Мнушкин | METHOD AND INSTALLATION FOR PRODUCING ELEMENT SULFUR WITH TREATMENT OF TAIL GAS |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1220337A (en) * | 1958-02-18 | 1960-05-24 | Blaw Knox Co | Improvements in sulfur treatment |
| CN102381685A (en) * | 2010-08-25 | 2012-03-21 | 中国石油化工股份有限公司 | Degassing technique for liquid sulfur |
| ES2539368T3 (en) * | 2011-12-23 | 2015-06-30 | Air Liquide Global E&C Solutions Germany Gmbh | Procedure and device for degassing liquid sulfur |
| RU2501600C1 (en) * | 2012-11-01 | 2013-12-20 | Андрей Владиславович Курочкин | Device to produce sulfur |
| CN103213951B (en) * | 2013-04-25 | 2016-02-10 | 山东三维石化工程股份有限公司青岛分公司 | The sulphur condensation of sulfur recovery facility and separating device |
| CN103204477B (en) * | 2013-04-25 | 2014-10-15 | 山东三维石化工程股份有限公司 | Liquid sulphur collecting method for sulfur recovery |
| EA036132B1 (en) * | 2015-03-11 | 2020-10-01 | Уорлипарсонс Юроп Лтд. | High efficiency process for degassing of hydrogen sulfide from liquid sulfur |
| CN205709861U (en) * | 2016-06-02 | 2016-11-23 | 江苏晟宜环保科技有限公司 | H in a kind of removing molten sulfur2the system of S |
| CN106582272B (en) * | 2016-12-14 | 2019-11-15 | 山东迅达化工集团有限公司 | The desulfurizing and purifying technique of sour water stripping ammonia |
| CN107720704B (en) * | 2017-09-30 | 2019-08-27 | 中国化学工程第六建设有限公司 | Liquid sulfur degassing device |
| CN109437118A (en) * | 2018-12-07 | 2019-03-08 | 山东大学 | A kind of method and device handling industrial waste sulfuric acid Recovered sulphur |
| CN110054161A (en) * | 2019-04-22 | 2019-07-26 | 中石化广州工程有限公司 | A kind of liquid sulphur degasification technique and degasser |
| CN110655040A (en) * | 2019-11-05 | 2020-01-07 | 辽宁北方华锦五洲化工工程设计有限公司 | Liquid sulfur degassing process applied to refining device |
| CN212769874U (en) * | 2020-06-28 | 2021-03-23 | 中国石油工程建设有限公司 | Stripping liquid sulfur degassing integrated device |
| CN212292805U (en) * | 2020-07-28 | 2021-01-05 | 中国石油工程建设有限公司 | Device for degassing catalytic liquid sulfur |
-
2021
- 2021-08-31 CN CN202111016749.1A patent/CN115724407B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2014103043A (en) * | 2014-01-29 | 2015-08-10 | Игорь Анатольевич Мнушкин | METHOD AND INSTALLATION FOR PRODUCING ELEMENT SULFUR WITH TREATMENT OF TAIL GAS |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115724407A (en) | 2023-03-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2455399C2 (en) | System of stack gas cleaning and cooling | |
| JP5828719B2 (en) | Ammonia separation device and ammonia separation method | |
| US10258899B2 (en) | Mobile mechanical vapor recompression evaporator | |
| JPH0459243B2 (en) | ||
| CN115724407B (en) | Liquid sulfur degassing device and method | |
| CN115724406B (en) | Deep degassing device and method for liquid sulfur | |
| CN115724408B (en) | Degassing treatment device and method for liquid sulfur | |
| CN108444304B (en) | Raw coke oven gas waste heat recycling system | |
| CN111072204A (en) | Submerged combustion type evaporative crystallization system applied to high-salt and high-COD wastewater | |
| US5028396A (en) | Apparatus formed of high silicon chromium/nickel in steel in the manufacture of sulpheric acid | |
| CN213966566U (en) | Reaction kettle and reaction system | |
| CN111926173B (en) | Vaporization cooling system and method for stepping heating furnace | |
| CN114288700A (en) | Concentrated recovery system of waste sulfuric acid | |
| CN211060100U (en) | Boiler feed water deoxidization system | |
| CN210050786U (en) | Waste heat recovery device for boiler system | |
| CN112902685A (en) | Steam condensation method | |
| CN220495645U (en) | Liquid sulfur degassing system of sulfur recovery device | |
| CN208155096U (en) | A kind of air cooling device convenient for Steam Recovery | |
| US1457941A (en) | Cooler for reclaimed liquor and gas in paper-pulp processes | |
| CN217312611U (en) | Biphenyl ether mixture separation and recovery device | |
| CN214426501U (en) | Steam condensing device | |
| CN220454375U (en) | Low-temperature waste heat recovery device for preparing acid from sulfur or pyrite | |
| CN212566957U (en) | Heat exchange device applied to slag water circulation system | |
| KR100439250B1 (en) | System for deaerating | |
| CN215311252U (en) | Methanol storage tank deck respiratory gas recovery processing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |