CN112479289A - Ammonia nitrogen treatment device for water slurry gasification ash water - Google Patents
Ammonia nitrogen treatment device for water slurry gasification ash water Download PDFInfo
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- CN112479289A CN112479289A CN202011449835.7A CN202011449835A CN112479289A CN 112479289 A CN112479289 A CN 112479289A CN 202011449835 A CN202011449835 A CN 202011449835A CN 112479289 A CN112479289 A CN 112479289A
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- grey water
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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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention relates to a coal water slurry gasification grey water ammonia nitrogen treatment device, and belongs to the technical field of coal chemical industry. The device comprises: the tower comprises a stripping tower, a tower top condenser and a reflux tank, wherein a gas phase outlet of the stripping tower is connected with an inlet of the tower top condenser, an outlet of the tower top condenser is connected with an inlet of the reflux tank, and a liquid phase outlet of the reflux tank is connected with a reflux liquid inlet of the stripping tower. According to the invention, ammonia nitrogen in the ash water generated by flash evaporation is treated, so that the water quality is changed, the problem of pipeline scaling is improved, the problem that ammonia nitrogen in subsequent procedures is difficult to treat is solved, the production benefit is improved, the production process is optimized, and the system can stably operate.
Description
Technical Field
The invention relates to a coal water slurry gasification grey water ammonia nitrogen treatment device, and belongs to the technical field of coal chemical industry.
Background
The water-coal-slurry gasification process takes pure oxygen and water-coal-slurry as raw materials, adopts a fluidized bed reactor, and carries out partial oxidation reaction under the pressurized and non-catalytic conditions to generate CO and H2The synthesis gas is a main component, and a large amount of coal dust and fine ash can be carried in the high-temperature synthesis gas in the process of preparing the synthesis gas. After the high-temperature coal gas is chilled, cooled and washed and purified, the coal dust and the fine ash are washed by the chilled water to form gasified black water. The gasified black water is subjected to multi-stage flash evaporation to form grey water and flash steam, and most of ammonia nitrogen is left in the grey water.
Optimization of water systems in gasification systems is a problem in the field of coal chemical industry, wherein the problem of pipeline scaling caused by high alkalinity and high hardness of the water systems is a problem in the industry. In the prior art, the discharge capacity of the grey water is increased, the quality of the grey water is improved, and the process is optimized, but ammonia nitrogen substances contained in the grey water are not treated in the prior art.
As the ash water contains a small amount of ammonia nitrogen which has great influence, the problems of pipeline scaling, difficult ammonia nitrogen treatment, large system sewage discharge amount and the like are also easily caused after the ash water enters the next working procedure, so that the system is unstable in operation, the water quality does not reach the standard, the consumption is high, the benefit is low and the like.
Disclosure of Invention
In order to solve the technical problem, the invention provides a device and a method for reducing the content of ammonia nitrogen in ash water in a coal water slurry gasification process. The invention changes the water quality by treating the ammonia nitrogen in the ash water, greatly improves the problem of pipeline scaling, solves the problems of difficult ammonia nitrogen treatment, large amount of sewage discharged by the system and the like, optimizes the process and stabilizes the operation of the system.
In order to achieve the purpose, the specific technical scheme of the invention is as follows:
the invention provides a coal water slurry gasification grey water ammonia nitrogen treatment device on one hand, the device comprises: a stripping tower, a tower top condenser and a reflux tank; the stripping tower is provided with a feed inlet and a reflux inlet, and grey water is introduced into the feed inlet; a gas phase outlet is formed in the top of the stripping tower, the gas phase outlet of the stripping tower is connected with an inlet of a tower top condenser, and an outlet of the tower top condenser is connected with an inlet of a reflux tank; the reflux tank is provided with a liquid phase outlet and a gas phase outlet, the liquid phase outlet of the reflux tank is connected with the reflux liquid inlet of the stripping tower, and the gas phase outlet of the reflux tank discharges ammonia-containing gas.
Further, the tower bottom of the stripping tower is provided with a central partition plate, and the tower bottom of the stripping tower is provided with an outlet I and an outlet II.
Furthermore, the device also comprises a reboiler, the reboiler is connected with an outlet I of the stripping tower, and an outlet of the reboiler is connected with a steam inlet of the stripping tower.
Further, a gas phase outlet of the stripping tower is connected with an inlet of the tower top condenser through a heat tracing pipeline.
Furthermore, the device also comprises a heat exchanger, wherein a tube pass inlet of the heat exchanger is connected with an outlet II of the stripping tower, and a tube pass outlet of the heat exchanger is connected with a feed inlet of the stripping tower.
Furthermore, the device also comprises a water storage tank, wherein an outlet of the water storage tank is connected with a shell pass inlet of the heat exchanger, and the ammonia nitrogen-containing grey water in the water storage tank enters the shell pass inlet of the heat exchanger through a pump body.
Further, the tower type of the stripping tower is a plate tower.
Further, a reflux liquid inlet of the stripping tower is arranged above the first layer of tower plate of the stripping tower.
The invention also provides a method for treating ammonia nitrogen-containing grey water by using the ammonia nitrogen treatment device for the water-coal-slurry gasification grey water, which comprises the following steps:
(1) heating the ammonia nitrogen-containing grey water to be treated by a heat exchanger;
(2) the heated ammonia nitrogen-containing grey water enters a stripping tower for ammonia distillation;
(3) condensing the stripped ammonia-containing steam by a tower top condenser, then feeding the ammonia-containing steam into a reflux tank, discharging ammonia-containing gas through a gas phase outlet of the reflux tank, and feeding the condensate into a stripping tower for cyclic stripping;
(4) a part of the stripped ammonia-nitrogen-removal grey water enters a reboiler through an outlet I, and the ammonia-nitrogen-removal grey water is heated by the reboiler to maintain the ammonia stripping and evaporation process;
(5) and the other part of the deamination and nitrogen removal grey water enters the heat exchanger through an outlet II, and is used as gasification flash evaporation water after being cooled or is sent to sewage treatment equipment for treatment.
Further, low pressure steam is used as a heat source to heat the deaminated nitrogen grey water through a reboiler.
The invention reduces ammonia nitrogen treatment load of the ash water sent to the sewage treatment unit by reducing ammonia nitrogen in the gasified ash water, thereby achieving the purpose of sewage discharge standard. The principle of the invention is as follows: after the grey water enters the stripping tower, the grey water is heated by a reboiler at the bottom of the stripping tower to vaporize the grey water into steam, ammonia nitrogen substances in the stripped grey water are discharged from the top of the stripping tower, the ammonia nitrogen substances are cooled by a condenser at the top of the stripping tower and are changed into a mixed state of gas and liquid to enter a reflux tank, the liquid is circulated into the stripping tower, the ammonia-containing gas is discharged from the reflux tank to enter a torch system, the purpose of removing ammonia from the grey water is achieved, and the grey water after ammonia removal is discharged by a bottom pump of the stripping tower.
The invention has the beneficial effects that:
according to the invention, ammonia nitrogen in the ash water generated by flash evaporation is treated, so that the water quality is changed, the problem of pipeline scaling is improved, the problem that ammonia nitrogen in subsequent procedures is difficult to treat is solved, the production benefit is improved, the production process is optimized, and the system can stably operate.
Drawings
FIG. 1 is a schematic structural diagram of a water-coal-slurry gasification grey water ammonia nitrogen treatment device in embodiment 1.
Wherein: 1. a water storage tank; 2. a heat exchanger; 3. a stripping column; 4. a tower top condenser 5 and a reflux tank; 6. a reboiler; 7. a central baffle.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
The low-pressure steam in the embodiment is 0.45MPaG saturated steam, the flow rate is 30t/h, and the heat quantity which can be provided by the low-pressure steam is about 82000 MJ/h.
A coal water slurry gasification grey water ammonia nitrogen treatment device is structurally shown in figure 1, an outlet of a water storage tank 1 is connected with a shell pass inlet of a heat exchanger 2, ammonia nitrogen containing grey water in the water storage tank 1 enters a shell pass inlet of the heat exchanger 2 through a pump body, a tube pass outlet of the heat exchanger 2 is connected with a liquid inlet of a plate-type stripping tower 3, the ammonia nitrogen containing grey water exchanges heat through the heat exchanger 2, a gas phase outlet of the plate-type stripping tower 3 is connected with an inlet of a tower top condenser 4 through a heat tracing pipeline, a liquid phase outlet of the tower top condenser 4 is connected with an inlet of a reflux tank 5, a liquid phase outlet of the reflux tank 5 is connected with a reflux liquid inlet above a first layer of tower plates of the plate-type stripping tower 3, a central partition plate 7 is arranged at the bottom of the plate-type stripping tower 3, an outlet I is arranged on the tower bottom of one side of the, an outlet of the reboiler 6 is connected with a steam inlet at the lower end 3 of the plate-type stripping tower, and an outlet II of the plate-type stripping tower 3 is connected with a tube side inlet of the heat exchanger 2.
The process parameters of the stripping column are as follows:
TABLE 1
The hydraulic calculation result shows that the maximum flooding value in the bubbling region for the gas phase is 60 percent in the designed gas-liquid phase operation elasticity range; for the liquid phase, the maximum flooding value in the downcomer is 43%; the total tray pressure drop calculated at normal 100% flow is approximately 200 mbar.
A method of treating ammonia nitrogen-containing grey water for the apparatus of example 1, the method comprising the steps of:
(1) heating the grey water with the temperature of 80 ℃ and the ammonia nitrogen content of 30.14kmol/h to 130 ℃ through a heat exchanger 2;
(2) the heated ammonia nitrogen-containing grey water enters a plate-type stripping tower 3 for ammonia distillation;
(3) the stripped ammonia-containing steam is condensed by a tower top condenser 4 and then enters a reflux tank 5, ammonia-containing gas is discharged through a gas phase outlet of the reflux tank 5, and condensate enters a plate-type stripping tower 2 through a liquid phase outlet of the reflux tank 5 for cyclic stripping;
(4) part of the stripped ammonia-nitrogen-removing grey water enters a reboiler 6 through a liquid phase outlet I, the grey water in the reboiler 6 is heated through low-pressure steam, and the steam at the outlet of the reboiler 6 enters a plate-type stripping tower 3 through a steam inlet of the plate-type stripping tower 3 to maintain a stripping ammonia distillation process;
(5) and the other part of the ammonia nitrogen removal grey water enters a heat exchanger 2 through a liquid phase outlet II for heat exchange, the ammonia nitrogen content is 5.95kmol/h, and then the ammonia nitrogen removal grey water is sent to sewage treatment equipment for treatment or is used as water for gasification flash evaporation.
The specific parameters of material balance in the stripping process using the above apparatus and method are shown in Table 2. After the treatment by the device, the ammonia nitrogen content in the ammonia-containing nitrogen ash water is reduced from 30.14kmol/h to 5.95kmol/h, and the removal rate is 80.3%.
TABLE 2
Claims (10)
1. The utility model provides a coal slurry gasification buck ammonia nitrogen treatment device which characterized in that, the device includes: a stripping tower, a tower top condenser and a reflux tank;
the stripping tower is provided with a feed inlet and a reflux inlet, and grey water is introduced into the feed inlet;
a gas phase outlet is formed in the top of the stripping tower, the gas phase outlet of the stripping tower is connected with an inlet of a tower top condenser, and an outlet of the tower top condenser is connected with an inlet of a reflux tank;
the reflux tank is provided with a liquid phase outlet and a gas phase outlet, the liquid phase outlet of the reflux tank is connected with the reflux liquid inlet of the stripping tower, and the gas phase outlet of the reflux tank discharges ammonia-containing gas.
2. The process arrangement as claimed in claim 1, characterized in that the stripping column is provided with a central baffle at the bottom and with an outlet i and an outlet ii at the bottom.
3. The process arrangement of claim 2, further comprising a reboiler connected to the outlet i of the stripping column, the reboiler outlet being connected to the steam inlet of the stripping column.
4. The process arrangement according to claim 3, wherein the gas phase outlet of the stripper and the inlet of the overhead condenser are connected by a heat trace pipeline.
5. The apparatus of claim 4, further comprising a heat exchanger having a tube side inlet connected to the outlet II of the stripping column and a tube side outlet connected to the feed inlet of the stripping column.
6. The ammonia nitrogen-containing grey water treatment device according to claim 5, characterized in that the device further comprises a water storage tank, an outlet of the water storage tank is connected with the shell side inlet of the heat exchanger, and the ammonia nitrogen-containing grey water in the water storage tank enters the shell side inlet of the heat exchanger through a pump body.
7. The ammonia nitrogen-containing grey water treatment apparatus of claim 6, wherein the stripper is in the form of a tray column.
8. The ammonia nitrogen-containing grey water treatment apparatus of claim 7, wherein the reflux inlet of the stripper is disposed above the first stage tray of the stripper.
9. A method for treating ammonia nitrogen containing grey water using the apparatus of any of claims 1-8, characterized in that: the method comprises the following steps:
(1) heating the ammonia nitrogen-containing grey water to be treated by a heat exchanger;
(2) the heated ammonia nitrogen-containing grey water enters a stripping tower for ammonia distillation;
(3) condensing the stripped ammonia-containing steam by a tower top condenser, then feeding the ammonia-containing steam into a reflux tank, discharging ammonia-containing gas through a gas phase outlet of the reflux tank, and feeding the condensate into a stripping tower for cyclic stripping;
(4) a part of the stripped ammonia-nitrogen-removal grey water enters a reboiler through an outlet I, and the ammonia-nitrogen-removal grey water is heated by the reboiler to maintain the ammonia stripping and evaporation process;
(5) and the other part of the deamination and nitrogen removal grey water enters the heat exchanger through an outlet II, and is used as gasification flash evaporation water after being cooled or is sent to sewage treatment equipment for treatment.
10. The method of claim 9, wherein low pressure steam is used as a heat source to heat the deaminated nitrogen grey water through a reboiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011449835.7A CN112479289A (en) | 2020-12-09 | 2020-12-09 | Ammonia nitrogen treatment device for water slurry gasification ash water |
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| CN202011449835.7A CN112479289A (en) | 2020-12-09 | 2020-12-09 | Ammonia nitrogen treatment device for water slurry gasification ash water |
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| CN202011449835.7A Pending CN112479289A (en) | 2020-12-09 | 2020-12-09 | Ammonia nitrogen treatment device for water slurry gasification ash water |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3966633A (en) * | 1974-09-23 | 1976-06-29 | Cogas Development Company | Waste water processing |
| WO2015041914A1 (en) * | 2013-09-19 | 2015-03-26 | Dow Global Technologies Llc | Optimization of stripper feed configuration for rich/lean solvent regeneration |
| CN104843813A (en) * | 2014-12-30 | 2015-08-19 | 中国天辰工程有限公司 | Coal gasification high ammonia nitrogen wastewater treatment process |
| CN206660641U (en) * | 2017-03-21 | 2017-11-24 | 山东华鲁恒升化工股份有限公司 | The converting means that stripping process is applied in coal water slurry gasification |
| CN211770391U (en) * | 2020-01-21 | 2020-10-27 | 恒力石化（大连）炼化有限公司 | Coal water slurry gasification flash system |
-
2020
- 2020-12-09 CN CN202011449835.7A patent/CN112479289A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3966633A (en) * | 1974-09-23 | 1976-06-29 | Cogas Development Company | Waste water processing |
| WO2015041914A1 (en) * | 2013-09-19 | 2015-03-26 | Dow Global Technologies Llc | Optimization of stripper feed configuration for rich/lean solvent regeneration |
| CN104843813A (en) * | 2014-12-30 | 2015-08-19 | 中国天辰工程有限公司 | Coal gasification high ammonia nitrogen wastewater treatment process |
| CN206660641U (en) * | 2017-03-21 | 2017-11-24 | 山东华鲁恒升化工股份有限公司 | The converting means that stripping process is applied in coal water slurry gasification |
| CN211770391U (en) * | 2020-01-21 | 2020-10-27 | 恒力石化（大连）炼化有限公司 | Coal water slurry gasification flash system |
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