CN106927530B - Vacuum flash evaporation cooling device - Google Patents
Vacuum flash evaporation cooling device Download PDFInfo
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- CN106927530B CN106927530B CN201710311611.1A CN201710311611A CN106927530B CN 106927530 B CN106927530 B CN 106927530B CN 201710311611 A CN201710311611 A CN 201710311611A CN 106927530 B CN106927530 B CN 106927530B
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- water
- shell
- cooling device
- cooling
- flash
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/06—Flash evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
Abstract
The invention relates to a vacuum flash evaporation cooling device, comprising: the water cooling device comprises a shell, a water cooling device and an inner component. According to the vacuum flash evaporation cooling device, flash steam is condensed after passing through the cooler, so that water in the flash steam can be effectively recovered. In addition, because the water cooling device is arranged in the shell of the vacuum flash tank, the traditional vacuum flash tank and the traditional vacuum flash condenser can be combined into a whole, the occupied area and the connecting pipeline of the two devices are reduced, the vacuum flash condenser is prevented from being blocked, the long-period operation of the system is improved, and the equipment cost is reduced.
Description
Technical Field
The invention relates to the technical field of coal gasification equipment, in particular to a vacuum flash evaporation cooling device.
Background
The coal gasification technology is the most important production technology for preparing the synthesis gas, after dry coal or wet coal is combusted through a gasification furnace, ash slag is chilled and washed to remove coarse slag, black water containing fine ash is subjected to secondary or tertiary flash evaporation to recover heat, and ash water is obtained and is recycled as gasification washing liquid. Generally, black water refers to water containing a large amount of gasification carbon residue directly discharged from the bottoms of a gasification furnace and a washing tower; the grey water is water obtained by treating black water by a vacuum flash evaporation technology, settling, clarifying and deslagging.
The vacuum flash evaporation technology used in the coal gasification technical field generally needs a vacuum flash evaporation tank and a vacuum flash evaporation condenser, wherein the vacuum flash evaporation tank is used for providing a space for rapid evaporation and vapor-liquid separation of fluid (black water); the vacuum flash evaporation condenser is used for cooling the entering gas phase, sending the cooled liquid phase (grey water) into a grey water tank, and discharging the gas phase to the atmosphere through a vacuum pump. Because the gas coming out of the vacuum flash tank and entering the vacuum flash condenser contains fine ash, the long-time operation of the system can cause the blockage of the vacuum flash condenser, and the stable operation of the system is influenced.
Chinese patent publication No. CN101306899a discloses a grey water treatment process applied to a staged gasifier, which comprises the following steps: black water discharged from the staged gasifier and the synthesis gas washing tower respectively enters a high-pressure flash tank after being decompressed through respective pipelines, liquid phase obtained by high flash in the high-pressure flash tank enters a vacuum flash tank through a pressure reducing valve to carry out secondary flash, liquid phase obtained by flash in the vacuum flash tank enters a settling tank with a position lower than that of the vacuum flash tank to be settled under the action of gravity, gas phase obtained by high flash in the high-pressure flash tank enters a top separator of the high flash tank to carry out gas-liquid separation, one part of separated gas phase enters a deaerator to directly contact with grey water for heat exchange, and the other part of steam enters a steam buffer tank through a pressure regulating valve. The device adopting the technical scheme still adopts the flash tank and the separator (condenser) in parallel, and has the disadvantages of complex structure, large equipment quantity and large occupied area.
Chinese patent publication No. CN204689811U discloses a preliminary water treatment system for coal gasification, which includes a medium-pressure flash tank, a low-pressure flash tank, a vacuum flash separation tank, a medium-pressure flash separation tank and a deaerator. The liquid outlet at the bottom of the medium-pressure flash tank is connected with the inlet at the upper part of the low-pressure flash tank, the liquid outlet at the bottom of the low-pressure flash tank is connected with the inlet at the upper part of the vacuum flash tank, the gas outlet at the top end of the low-pressure flash tank is connected with the inlet of the deaerator, and the gas outlet of the vacuum flash tank is connected with the inlet at the middle upper part of the vacuum flash separation tank through the vacuum flash cooler; the outlet at the top of the medium-pressure flash tank is connected with the inlet of the medium-pressure flash separation tank through a grey water heater and a medium-pressure flash cooler, and the outlet at the bottom of the medium-pressure flash separation tank is connected with a deaerator. The water treatment system has the defects of large equipment quantity, complex structure, separation of a flash tank and a flash cooler and inconvenient maintenance.
Accordingly, there is a need in the art for improvements to existing flash systems to avoid the ash in black and grey water from adversely affecting equipment, particularly vacuum flash condensers; meanwhile, it is expected that the system structure and the flow can be further simplified, and the number of devices and the floor area can be reduced.
Disclosure of Invention
The invention aims to provide a vacuum flash evaporation cooling device, which is used for solving the problem that ash content in the discharged water in the prior coal gasification technology has adverse effect on a vacuum flash evaporation condenser, and simultaneously can further simplify the structure and the flow of a system and reduce the number of equipment and the occupied area. In addition, the vacuum flash evaporation cooling device has the advantages of low failure rate and low cost.
To achieve the above object, the present invention relates to a vacuum flash cooling apparatus, comprising: a housing, a water cooling device and an internal member, wherein,
the interior of the housing defining a receiving chamber for providing a flash space for water; the center of the top of the shell is provided with a water cooling device interface which is used for connecting with a water cooling device; a flash evaporation cooling gas outlet is formed in the top of the shell and around the water cooling device interface; a black water inlet is arranged in the middle of the side wall of the shell; the bottom of the shell is provided with a flash evaporation liquid outlet,
the water cooling device comprises an outer sealing head, an inner sealing head and a water cooling pipe between the outer sealing head and the inner sealing head; the water cooling device is vertically arranged on a water cooling device interface at the top of the shell, so that an outer sealing head of the water cooling device and the upper part of the water cooling pipe are positioned outside the shell, and an inner sealing head and the lower part of the water cooling pipe are positioned inside the shell; the upper part of the water-cooling pipe is provided with a cooling water inlet and a cooling water outlet,
the internal components comprise a guide cylinder, a baffle plate and an erosion-resistant baffle plate; the guide shell is arranged in the shell, the lower part of the water-cooled tube and the inner sealing cap are covered in the guide shell, the lower part of the guide shell is opened, and the upper part of the guide shell is connected with the top of the shell, so that a flash evaporation cooling gas outlet is connected into the guide shell; the baffle plates are respectively arranged between the wall of the guide cylinder and the wall of the water-cooled tube vertically and horizontally, and the adjacent baffle plates are staggered from left to right; the erosion-preventing baffle is a herringbone baffle, the top end of the erosion-preventing baffle is opposite to the black water inlet, and the bottom of the erosion-preventing baffle covers the guide cylinder.
Through the arrangement of the guide shell and the baffle plate, the gas phase entering the guide shell after flash evaporation folds and rises along the path limited by the guide shell and the baffle plate, and fully exchanges heat with the water-cooled tube; the gas phase after heat exchange and cooling by the water cooling pipe is sent to a vacuum pump through a flash evaporation cooling gas outlet, and the liquid phase falls to the bottom of the device under the action of gravity and is discharged out of the device through a flash evaporation liquid outlet. In addition, through the arrangement of the herringbone erosion-proof baffle, the black water entering the device is guided, the black water entering the vacuum flash evaporation cooling device is prevented from directly scouring the guide cylinder, and the service life and the maintenance period of the system are prolonged.
In one embodiment, the housing, the draft tube and the water cooling device are all cylindrical. Optionally, the central axis of the shell coincides with the central axis of the guide shell; furthermore, the central axes of the shell, the guide cylinder and the water cooling device are all overlapped.
In one embodiment, the water cooling device is installed on the water cooling device interface through a flange, and a drain port is arranged at the bottom of an inner sealing head of the water cooling device. The drain port is used for removing impurities in the water-cooling pipe and maintaining the water-cooling pipe.
In one embodiment, the water-cooling tubes are divided into an ascending water-cooling tube and a descending water-cooling tube according to different flow directions of cooling water in the water-cooling tubes. And cooling water enters the water cooling device from the cooling water inlet, passes through the repeated turning back of the ascending water-cooling tube and the descending water-cooling tube, and flows out of the water cooling device from the cooling water outlet. The heat exchange area can be further increased by such an arrangement.
In one embodiment, the flash cooled gas outlets are 2 or more in number and equally spaced equidistant from the center point of the top of the shell. Through such setting can open or close a plurality of flash distillation cooling gas export in order to satisfy the cooling gas outflow pressure value according to actual conditions needs, can compromise the pressure balance in the shell simultaneously.
In one embodiment, the black water inlets are positioned in the middle of the shell, the number of the black water inlets is 2 or more, and the black water inlets are equidistantly and evenly distributed by taking the axis of the shell as the center; the flash evaporation liquid outlets are 2 or more in number and are arranged at different heights of the shell.
According to some embodiments of the invention, the housing is provided with a manhole for access by service personnel to the interior of the apparatus for service.
According to some embodiments of the invention, the operating pressure and operating temperature inside the enclosure is determined from the inlet pressure and temperature at which a vacuum pump connected to the flash cooling gas outlet is operating.
In one embodiment, a central axis of the guide shell coincides with a central axis of the outer shell, and the guide shell is welded to a top wall inside the outer shell.
According to some embodiments of the invention, a plurality of angle irons are welded between the guide shell and the inner wall of the shell for supporting the guide shell.
According to some embodiments of the invention, a plurality of baffles are arranged in the draft tube, all water cooling tubes vertically pass through the baffles, and all baffles are arranged at equal distances.
The vacuum flash evaporation cooling device has the following advantages:
by integrating the cooling device in the flash evaporation device, the vacuum flash evaporation cooling device has the advantages of simplified operation flow, less equipment quantity construction and reduced occupied area. Meanwhile, compared with the traditional vacuum flash tank and a vacuum flash condenser, the vacuum flash cooler provided by the invention has the advantages that one device is reduced, the failure rate is reduced, and the centralized maintenance is convenient.
Drawings
Fig. 1 is a schematic view of the structure of a vacuum flash cooling apparatus according to an embodiment of the present invention.
FIG. 2 is a prior art black water treatment process employing a vacuum flash tank and a vacuum flash condenser.
FIG. 3 is a black water treatment process using the vacuum flash cooling apparatus of the present invention.
Wherein the reference numerals are:
the vacuum flash evaporation cooling device comprises a vacuum flash evaporation cooling device 100, a shell 1, a black water inlet 11, a flash evaporation liquid outlet 12, a flash evaporation cooling gas outlet 13, a water cooling device 2, an outer sealing head 20, a cooling water inlet 201, a cooling water outlet 202, an inner sealing head 21, a drain outlet 211, a water cooling pipe 22, an anti-erosion baffle 23, a guide cylinder 24 and a baffle plate 25.
Detailed Description
The technical solutions and effects of the present invention are further described below by the following detailed description and the accompanying drawings. It is to be understood that the following embodiments are illustrative of the present invention, but are not intended to limit the scope of the present invention.
As shown in fig. 1, in one particular embodiment, the vacuum flash cooling apparatus 100 comprises an outer shell 1, a water cooling apparatus 2, and internal components; the inside of the shell 1 is limited into a containing cavity for providing a flash evaporation space for water, a water cooling device interface is arranged at the center of the top of the shell 1, 6 flash evaporation cooling gas outlets 13 are arranged at the top of the shell 1 around the water cooling device interface and are equidistantly and evenly distributed by taking the central point of the top of the shell 1 as the center; the middle part of the side wall of the shell 1 is provided with a black water inlet 11; the bottom of the shell 1 is provided with two flash liquid outlets 12, one of the two flash liquid outlets 12 is arranged at the lower part of the shell close to the inner seal head 21, and the other is arranged at the bottom of the shell.
The water cooling device 2 comprises an outer seal head 20, an inner seal head 21 and a water cooling pipe 22 between the outer seal head and the inner seal head; the water cooling device 2 is vertically arranged on a water cooling device interface at the top of the shell 1 through a flange, the upper parts of the outer seal head 20 and the water cooling tube 22 are positioned on the shell 1, and the lower parts of the inner seal head 21 and the water cooling tube 22 are positioned in the shell 1; the upper part of the water cooling pipe 22 is provided with a cooling water inlet 201 and a cooling water outlet 202. The bottom of the inner seal head 21 is provided with a drain hole 211.
The internal components comprise a guide shell 24, a baffle plate 25 and an erosion-resistant baffle plate 23; the guide shell 24 is arranged between the shell 1 and the water cooling device 2 and covers the lower part of the water cooling pipe 22 and the inner end enclosure 21, the lower part of the guide shell 24 is opened, the upper part of the guide shell 24 is welded on the top wall in the shell 1, and the flash evaporation cooling gas outlet 13 is connected to the inside of the guide shell 24; the 5 baffle plates 25 are respectively arranged between the wall of the guide shell 24 and the wall of the water-cooled tube 22 up and down and horizontally, the adjacent baffle plates 25 are arranged in a left-right staggered manner, all the water-cooled tubes 22 vertically penetrate through all the baffle plates 25, and all the baffle plates 25 are arranged at equal distances; an anti-erosion baffle 23 shaped like a Chinese character 'ren' is arranged between the black water inlet 11 and the guide cylinder 24, the top end of the anti-erosion baffle is opposite to the black water inlet 11 to play a role in shunting, the bottom of the anti-erosion baffle 23 covers the guide cylinder 24, and the black water entering the device is prevented from being directly sprayed onto the guide cylinder 24.
Wherein, shell 1, draft tube 24 are the cylinder and set up with the central axis, do benefit to so and reduce equipment volume and production and processing convenience. In addition, the central axis of the shell 1 is coincident with the central axis of the guide shell 24, so that the structure of the vacuum flash evaporation cooling device 100 is more compact. The number of the water-cooling pipes 22 is 12, and the water-cooling pipes are divided into 6 ascending water-cooling pipes and 6 descending water-cooling pipes. Cooling water enters the water cooling device 2 from the cooling water inlet 201, sequentially passes through all the ascending water-cooling tubes and the descending water-cooling tubes respectively and is turned back for multiple times, and flows out of the water cooling device 2 from the cooling water outlet 202.
In one embodiment, the housing 1 is provided with a manhole (not shown) for access by service personnel to the interior of the apparatus 1 for service. In addition, a plurality of angle irons (not shown) are welded between the guide shell 24 and the inner wall of the shell 1 and used for supporting the guide shell 24 and strengthening the device. Wherein the operating pressure and operating temperature inside the enclosure 1 is determined based on the inlet pressure and temperature at which a vacuum pump (not shown) connected to the flash cooling gas outlet 13 is operating.
Therefore, black water from a high-pressure flash tank or a low-pressure flash tank enters the shell 1 through the black water inlet 11 for flash evaporation, the flashed black water falls into the bottom in the shell 1 due to gravity, and the flashed black water is discharged out of the shell 1 through the flash liquid outlet 12; the flash steam enters the guide shell 24 from the bottom of the guide shell 24 and contacts with the water-cooling pipe 22 for heat exchange, and condensed water falls into the bottom in the shell 1 due to gravity, joins with the flash-evaporated black water and is discharged out of the shell 1 through the flash liquid outlet 12. The gas phase separated from the flash cooled gas outlet 13 is sent to a vacuum pump.
Referring to fig. 2, a prior art black water treatment scheme employing a vacuum flash tank and a vacuum flash condenser is shown. Black water of the gasification furnace and the washing tower passes through the high-pressure flash tank and the low-pressure flash tank and then enters the vacuum flash tank, a liquid phase discharged from the vacuum flash tank is sent to the settling tank, a gas phase also needs to enter the vacuum flash condenser for cooling, the cooled liquid phase is sent to the grey water tank, and the gas phase is discharged to the atmosphere through the vacuum pump. The flow after using the vacuum flash cooling device of the present invention is shown in fig. 3: and black water of the gasification furnace and the washing tower passes through the high-pressure flash tank and the low-pressure flash tank and then enters the vacuum flash cooling device for flash cooling, a liquid phase discharged from the vacuum flash cooling device directly enters the settling tank, and a gas phase is discharged to the atmosphere through the vacuum pump.
The invention can complete the functions of two devices of the traditional vacuum flash tank and the vacuum flash condenser by only one device, avoids the problem that the vacuum flash condenser is easy to block in the traditional process, and can reduce the occupied area of the device and the civil engineering investment to a great extent because one device is reduced.
According to the vacuum flash evaporation cooling device provided by the embodiment of the invention, the black water from the high-pressure flash tank or the low-pressure flash tank is subjected to flash evaporation and temperature reduction simultaneously, so that the traditional vacuum flash evaporation process is simplified, the floor area of equipment is reduced, the civil engineering cost and the equipment failure rate are reduced, and the continuous service cycle of the device is prolonged.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. A vacuum flash cooling apparatus, comprising: a shell, a water cooling device and an internal component, which is characterized in that,
the inside of the shell is limited to be a containing cavity, a water cooling device interface is arranged in the center of the top of the shell, flash evaporation cooling gas outlets are formed in the top of the shell and around the water cooling device interface, a black water inlet is formed in the middle of the side wall of the shell, a flash evaporation liquid outlet is formed in the bottom of the shell, and a manhole is further formed in the shell;
the water cooling device comprises an outer seal head, an inner seal head and a water cooling pipe between the outer seal head and the inner seal head; the water cooling device is vertically arranged on a water cooling device interface at the top of the shell, so that an outer seal head of the water cooling device and the upper part of the water cooling pipe are positioned outside the shell, the upper part of the water cooling pipe is provided with a cooling water inlet and a cooling water outlet, the inner seal head and the lower part of the water cooling pipe are positioned inside the shell, the water cooling device is arranged on the water cooling device interface through a flange, and the bottom of the inner seal head of the water cooling device is provided with a drain port;
the internal components comprise a guide cylinder, a baffle plate and an erosion-resistant baffle plate; the guide shell is arranged in the shell, and the lower part of the water-cooled tube and the inner sealing cover are covered in the guide shell; the lower part of the guide cylinder is opened, and the upper part of the guide cylinder is connected with the top of the shell, so that a flash evaporation cooling gas outlet is connected to the inside of the guide cylinder; the baffle plates are respectively arranged between the wall of the guide cylinder and the wall of the water-cooled tube in an up-down and horizontal mode, and the adjacent baffle plates are arranged in a left-right staggered mode; the erosion prevention baffle is a herringbone baffle, the top end of the erosion prevention baffle is just opposite to a black water inlet, the bottom of the erosion prevention baffle covers the guide cylinder, the shell, the guide cylinder and the water cooling device are cylindrical, and the shell coincides with the central axis of the guide cylinder.
2. The vacuum flash cooling apparatus of claim 1, wherein the plurality of water-cooled tubes are divided into an ascending water-cooled tube and a descending water-cooled tube according to different flow directions of cooling water in the water-cooled tubes; and cooling water enters the water cooling device from the cooling water inlet, passes through the upward water cooling pipe and the downward water cooling pipe and is repeatedly turned back, and flows out of the water cooling device from the cooling water outlet.
3. The vacuum flash cooling apparatus of claim 2, wherein the flash cooling gas outlets are 2 or more in number and equally spaced at equal intervals centered on the center point at the top of the shell.
4. The vacuum flash evaporation cooling device according to claim 3, wherein the black water inlets are located in the middle of the outer shell, and the number of the black water inlets is 2 or more, and the black water inlets are equally distributed at equal intervals with the axis of the outer shell as the center; the flash evaporation liquid outlets are 2 or more in number and are arranged at different heights of the shell.
5. The vacuum flash cooling apparatus of claim 4 wherein a plurality of baffles are provided within the draft tube, all water cooled tubes pass vertically through the baffles, and all baffles are equally spaced.
6. The vacuum flash cooling apparatus of claim 5, wherein a plurality of angle irons are welded between the draft tube and the inner wall of the shell for supporting the draft tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710311611.1A CN106927530B (en) | 2017-05-05 | 2017-05-05 | Vacuum flash evaporation cooling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710311611.1A CN106927530B (en) | 2017-05-05 | 2017-05-05 | Vacuum flash evaporation cooling device |
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| Publication Number | Publication Date |
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| CN106927530A CN106927530A (en) | 2017-07-07 |
| CN106927530B true CN106927530B (en) | 2023-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710311611.1A Active CN106927530B (en) | 2017-05-05 | 2017-05-05 | Vacuum flash evaporation cooling device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202065980U (en) * | 2011-04-26 | 2011-12-07 | 武汉凯比思电力设备有限公司 | Flash tank |
| CN203904370U (en) * | 2014-06-27 | 2014-10-29 | 福建立信换热设备制造股份公司 | Device applied to heat recovery of slag flushing water |
| CN206705725U (en) * | 2017-05-05 | 2017-12-05 | 北京清创晋华科技有限公司 | A kind of vacuum flashing cooling device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8728328B2 (en) * | 2007-10-23 | 2014-05-20 | General Electric Company | Methods for removing suspended solids from a gasification process stream |
| US10005679B2 (en) * | 2014-10-29 | 2018-06-26 | General Electric Company | Black water processing system with high pressure flash vessel |
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2017
- 2017-05-05 CN CN201710311611.1A patent/CN106927530B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202065980U (en) * | 2011-04-26 | 2011-12-07 | 武汉凯比思电力设备有限公司 | Flash tank |
| CN203904370U (en) * | 2014-06-27 | 2014-10-29 | 福建立信换热设备制造股份公司 | Device applied to heat recovery of slag flushing water |
| CN206705725U (en) * | 2017-05-05 | 2017-12-05 | 北京清创晋华科技有限公司 | A kind of vacuum flashing cooling device |
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