CN211339084U - Coal chemical industry gasification sewage pretreatment device - Google Patents
Coal chemical industry gasification sewage pretreatment device Download PDFInfo
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- CN211339084U CN211339084U CN201921837822.XU CN201921837822U CN211339084U CN 211339084 U CN211339084 U CN 211339084U CN 201921837822 U CN201921837822 U CN 201921837822U CN 211339084 U CN211339084 U CN 211339084U
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Abstract
The utility model relates to a coal chemical industry gasification sewage pretreatment device, pond in the middle of it includes inclined plate sedimentation tank, first middle pond, scrubbing tower, second, the import of gasification sewage pipe connection inclined plate sedimentation tank, the coagulating basin of inclined plate sedimentation tank is equipped with the coagulating stirrer, and the flocculation area is equipped with the flocculating stirrer, and pond in the middle of first is connected to one side overflow mouth of inclined plate sedimentation tank, middle pond passes through elevator pump pumping to strip process, the overflow outlet at inclined plate sedimentation tank top introduces the scrubbing tower through the air-blower, pond in the middle of the discharge port connection second of scrubbing tower, pond in the middle of the second passes through pipeline and pump connection first middle pond, the coagulating basin and/or flocculation area of inclined plate sedimentation tankIs provided with CO2And (3) an injection line. The utility model discloses can solve the sedimentary problem of lime ion in the ash water at the strip process more thoroughly, can improve strip process device operational aspect by a wide margin, reduce the device pickling number of times.
Description
Technical Field
The utility model relates to a coal chemical industry gasification sewage treatment technical field especially relates to a coal chemical industry gasification sewage pretreatment device.
Background
Because the coal chemical industry gasification sewage contains a large amount of ammonia nitrogen components, in order to recover the ammonia nitrogen and convert the ammonia nitrogen into ammonia water for recycling, simultaneously reduce the construction scale of a subsequent sewage treatment device and a wastewater treatment and reuse treatment device, save land occupation and investment, a plurality of coal chemical industry enterprises are constructed with gasification sewage pretreatment devices, and the current general gasification sewage pretreatment process comprises the following steps:
the common gasification sewage pretreatment device comprises three procedures of precipitation, steam stripping, dosing, acid washing and the like.
(1) Precipitation step
After the pH value of the gasified sewage is adjusted to be more than 12, coagulation and precipitation are carried out to reduce suspended matters, calcium ions and magnesium ions in the ash water and slow down scaling in the steam stripping process;
a sludge treatment system of a biochemical sewage treatment device outside a sludge discharge boundary area of the inclined plate sedimentation tank;
the supernatant of the inclined plate sedimentation tank is subjected to a lifting pumping steam stripping process.
(2) Stripping procedure
The grey water sent from the grey water precipitation procedure lifting pump is sent to a stripping tower after being preheated and heated by two-stage injection;
the operating pressure of the stripping tower is 0.35MPa (A), the operating temperature of the tower bottom is about 140 ℃, and the operating temperature of the tower top is 128 ℃;
ammonia nitrogen wastewater enters the stripping tower from the middle part through a wastewater inlet distributor, and low-pressure steam enters the stripping tower from the bottom part; an air cooler and a water cooler are arranged at the top of the stripping tower, ammonia-containing steam is condensed and cooled to 55 ℃ through air cooling, then is cooled to 40 ℃ continuously through water cooling, one part of condensate is used as top reflux liquid to return to the stripping tower, and the other part of 15% ammonia water is used as a byproduct and is sent out of a boundary region; deamination wastewater with the ammonia content of less than 150mg/L is obtained in a tower kettle of a stripping tower, heat is recovered through two-stage flash evaporation, and the deamination wastewater is cooled to below 40 ℃ through a wastewater air cooler and a wastewater cooler and then is discharged into a water outlet regulating tank;
the non-condensable gas discharged from the two-stage flash evaporation mixing section is pumped to a stripping tower by a steam ejector;
adding a 31% hydrochloric acid solution into the effluent regulating tank to regulate the pH of the grey water meeting the treatment requirement after steam stripping to about 8.7, and pumping the grey water out of the boundary area;
the non-condensable gas generated in the whole stripping process is enriched in a reflux tank, is discharged out of a critical area at the pressure of 0.2MPa (G) and is sent to a flare device.
(3) Acid washing process
Because the gasification grey water (i.e. gasification sewage) entering the system is sent from the gasification grey water treatment system after coagulation and precipitation, wherein the gasification grey water contains a certain amount of suspended matters and calcium and magnesium ions, obviously, the product of the calcium and magnesium ions and the ion concentration of anions forming precipitates with the calcium and magnesium ions is equal to the solubility product constant at the temperature, and at the moment, the calcium and magnesium ion concentration is the saturated concentration. Even after the pH adjustment, flocculation and inclined plate sedimentation of the sedimentation process of the device, the product of the calcium and magnesium ions and the ion concentration of the anions forming sediments with the calcium and magnesium ions still equals to the solubility product constant at the temperature, except that the hydroxyl ions are increased, the calcium and magnesium ions are reduced, but the solubility product still equals to the solubility product constant;
therefore, in the stripping section below the wastewater inlet, which is the middle-lower part of the stripping column, a precipitate is generated in the stripping column with the rise of pH, the rise of temperature, and the concentration of calcium and magnesium ions, and therefore, an acid washing system must be installed to periodically clean the stripping system on line.
In the prior art, NaOH is added in a precipitation process (namely an inclined plate sedimentation tank) mainly for recovering ammonia water in a stripping process and actually has certain effect of precipitating calcium and magnesium ions. At a certain temperature, Ca (OH)2Solubility product of 5.5 × 10-6；Mg(OH)2Solubility product of 1.8 × 10-11Adjusting the pH of the gasified grey water from 6-9 to 12 in the precipitation step (by using Ca (OH))2KSP of (a) is an example, K thereofSP＝[Ca]×[OH]2,[Ca]Is the concentration of calcium ions in the solution, the pH is high, [ OH ]]Large value, KSPAt a certain time, [ Ca ] in the solution]Low concentration, i.e. more calcium ions are precipitated) calcium and magnesium ions are reduced to some extent, but the precipitation is always in a precipitate stateThe solution is in a balanced state, so after entering a stripping process, a great amount of precipitates are generated when the temperature changes and the solution (suspension) is concentrated, pipelines and equipment are blocked, the running condition of the device is deteriorated, and even normal production cannot be realized, which is also the reason why the prior process has frequent acid washing and stripping processes.
SUMMERY OF THE UTILITY MODEL
The utility model provides a to prior art not enough, the utility model provides a coal industry gasification sewage pretreatment of water device of calcium ion concentration in reduction gasification sewage.
The utility model provides a technical scheme that its technical problem adopted is: the coal chemical gasification sewage pretreatment device comprises an inclined plate sedimentation tank, a first middle water tank, a washing tower and a second middle water tank, wherein a gasification sewage pipeline is connected with an inlet of the inclined plate sedimentation tank, a coagulation area of the inclined plate sedimentation tank is provided with a coagulation stirrer, the flocculation area is provided with a flocculation stirrer, an overflow port on one side of the inclined plate sedimentation tank is connected with the first middle water tank, the first middle water tank is pumped to a steam stripping process through a lift pump, an overflow port on the top of the inclined plate sedimentation tank is introduced into the washing tower through an air blower, a discharge port of the washing tower is connected with the second middle water tank, and the second middle water tank is connected with the first middle water tank through a pipeline and a pump;
the coagulation area of the inclined plate sedimentation tank is provided with an alkali liquor injection pipeline and a flocculating agent injection pipeline;
a flocculating agent injection pipeline is arranged in the flocculation area of the inclined plate sedimentation tank;
CO is arranged in the coagulation area and/or the flocculation area of the inclined plate sedimentation tank2And (3) an injection line.
In the preferred embodiment of the coal chemical gasification sewage pretreatment device provided by the present invention, the CO is introduced into the system2The injection line comprises outsourcing CO2Injection line and CO from a coal chemical syngas purification plant2CO of2And (3) an injection line.
In the preferred embodiment of the coal chemical gasification sewage pretreatment device provided by the present invention, the alkali solution in the alkali solution injection pipeline is NaOH.
The utility model provides a coal chemical industry gasification sewage pretreatment device's a preferred embodiment, the bottom drain of the inclined plate sedimentation district of inclined plate sedimentation tank passes through blow off pipe, pneumatic angle valve, sludge pump row to sludge treatment process.
Compared with the prior art, the utility model provides a coal chemical industry gasification sewage pretreatment device's beneficial effect is: the utility model discloses the coagulating area and/or flocculation area of inclined plate sedimentation tank set up CO2An injection pipeline for continuously introducing a certain amount of CO into the gasified sewage2Using CaCO3K ofSP＝2.8×10-9And Ca (OH)2Solubility product 5.5 × 10-6Under the condition of approximately 2000 times difference, the concentration of calcium ions in the water is reduced to 1/2000 of the original process, and the calcium ions in the gasified sewage are generally Mg2+The concentration of the calcium ion is 5 to 9 times of that of the calcium ion, so that the problem of the deposition of the calcium ion in the ash water in a stripping process is solved relatively completely;
due to MgCO3K ofSP＝3.5×10-8And Mg (OH)2Solubility product 1.8 × 10-11Is very large, therefore, CO is added2Without adding more Mg2+Precipitate, thus Mg2+Will still precipitate during the stripping process, but since the utility model already puts the Ca in solution in a higher content2+The 1999/2000 amount is deposited in advance and flocculated and removed, thereby greatly improving the operation condition of the device in the stripping process and reducing the acid washing times of the device.
Please refer to fig. 2, which is ca (oh)2Solubility as a function of temperature.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:
fig. 1 is a schematic structural diagram of a coal chemical gasification sewage pretreatment device provided by the present invention;
FIG. 2 shows Ca (OH) provided by the present invention2Solubility as a function of temperature.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the coal chemical gasification wastewater pretreatment device of the embodiment includes an inclined plate sedimentation tank 11, a first intermediate tank 12, a washing tower 13, and a second intermediate tank 14, a gasification wastewater pipeline 15 is connected to an inlet of the inclined plate sedimentation tank 11, a coagulation zone 112 of the inclined plate sedimentation tank 11 is provided with a coagulation stirrer 16, a flocculation zone 114 is provided with a flocculation stirrer 17, an overflow port on one side of the inclined plate sedimentation tank 116 is connected to the first intermediate tank 12, the first intermediate tank 12 is pumped to a stripping process by a lift pump 18, an overflow port on the top of the inclined plate sedimentation tank 116 is introduced into the washing tower 13 by an air blower 19, a discharge port of the washing tower 13 is connected to the second intermediate tank 14, the second intermediate tank 14 is connected to the first intermediate tank 12 by a pipeline and a pump, a drain outlet at the bottom of the inclined plate sedimentation tank 116 of the inclined plate sedimentation tank 11 is connected to the first intermediate tank 12 by a drain, The sludge pump 21 discharges the sludge to a sludge treatment process;
the coagulation zone 112 of the inclined plate sedimentation tank 11 is provided with an alkali liquor injection pipeline 22 and a flocculant injection pipeline 23, preferably, the alkali liquor in the alkali liquor injection pipeline 22 is NaOH; a flocculating region 114 of the inclined plate sedimentation tank 11 is provided with a flocculating agent injection pipeline 23; the coagulation area 112 and/or the flocculation area 114 of the inclined plate sedimentation tank 11 are/is provided with CO2And an injection line 24.
Preferably, the CO is2The injection line 24 includes outsourcing CO2Injection line and CO from a coal chemical syngas purification plant2CO of2And (3) an injection line.
The utility model discloses the coagulating area and/or flocculation area of inclined plate sedimentation tank set up CO2An injection pipeline for continuously introducing a certain amount of CO into the gasified sewage2Using CaCO3Ksp of (2.8 × 10)-9And Ca (OH)2Solubility product 5.5 × 10-6Under the condition of approximately 2000 times difference, the concentration of calcium ions in the water is reduced to 1/2000 of the original process, and the calcium ions in the gasified sewage are generally Mg2+The concentration of the calcium ion is 5 to 9 times of that of the calcium ion, so that the problem of the deposition of the calcium ion in the ash water in a stripping process is solved relatively completely;
due to MgCO3Ksp of (3.5 × 10)-8And Mg (OH)2Solubility product 1.8 × 10-11Is very large, therefore, CO is added2Without adding more Mg2+Precipitate, thus Mg2+Will still precipitate during the stripping process, but since the utility model already puts the Ca in solution in a higher content2+1999/2000 amount of (A) is deposited in advance and flocculatedTherefore, the operation condition of the device in the stripping process can be greatly improved, and the acid washing frequency of the device is reduced.
To further illustrate the present embodiment, the following are attached: the water quality data of the inlet water of the typical gasification sewage pretreatment device is as follows:
in this example, when CO is used2When the defect is not enough: ca (OH)2+CO2＝＝CaCO3↓+H2O; the phenomenon is as follows: clarifying the lime water to become turbid;
when CO is present2When sufficient: CO 22+CaCO3+H2O＝＝＝Ca(HCO3)2(ii) a The phenomenon is as follows: the turbid lime water becomes clear again;
the Ca produced (HCO3)2 was reacted with NaOH:
ca (HCO) in excess of NaOH3)2+2NaOH＝CaCO3↓+2H2O+Na2CO3
From this chemical reaction formula, it can be known that Ca (HCO) is generated during the process of adjusting the pH of the solution to 12 by adding a base3)2Will eventually disappear and become CaCO3And ↓.
The solubility product of this example is illustrated:
poorly soluble electrolytes establish a specific dynamic equilibrium in water. Although the insoluble electrolyte is insoluble, a part of anions and cations enter the solution, and the anions and cations entering the solution are deposited on the solid surface. When the rates of these two processes are equal, the dissolution of the poorly soluble electrolyte reaches an equilibrium state and the amount of solids is no longer reduced. Such an equilibrium state is called precipitation-dissolution equilibrium, and its precipitation equilibrium constant (solubility product) Ksp is called solubility product for short.
Ksp (solubility product) is a constant at a certain temperature, and its size reflects the dissolving capacity of a substance.
The amount of a substance's dissolving capacity can be expressed by the solubility product (Ksp) ═ C (A) ^ n × C (B) ^ m.
Generally, the greater the solubility product, the greater the amount of the substance contained in the solution; at a given temperature, the larger the Ksp of the material, the more the material (calcium and magnesium ions in this example) is dissolved in the solution (gasified waste water in this example).
The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes made by the present specification can be changed, or directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a coal industry gasification sewage pretreatment device which characterized in that: the system comprises an inclined plate sedimentation tank, a first middle water tank, a washing tower and a second middle water tank, wherein a gasification sewage pipeline is connected with an inlet of the inclined plate sedimentation tank, a coagulation area of the inclined plate sedimentation tank is provided with a coagulation stirrer, a flocculation area is provided with a flocculation stirrer, an overflow port on one side of the inclined plate sedimentation tank is connected with the first middle water tank, the first middle water tank is pumped to a steam stripping process through a lift pump, an overflow port on the top of the inclined plate sedimentation tank is introduced into the washing tower through an air blower, a discharge port of the washing tower is connected with the second middle water tank, and the second middle water tank is connected with the first middle water tank through a pipeline and a pump;
the coagulation area of the inclined plate sedimentation tank is provided with an alkali liquor injection pipeline and a flocculating agent injection pipeline;
a flocculating agent injection pipeline is arranged in the flocculation area of the inclined plate sedimentation tank;
CO is arranged in the coagulation area and/or the flocculation area of the inclined plate sedimentation tank2And (3) an injection line.
2. The coal chemical gasification sewage pretreatment device of claim 1, characterized in that: the CO is2The injection line comprises outsourcing CO2Injection line and CO from a coal chemical syngas purification plant2CO of2And (3) an injection line.
3. The coal chemical gasification sewage pretreatment device of claim 1, characterized in that: the alkali liquor in the alkali liquor injection pipeline is NaOH.
4. The coal chemical gasification sewage pretreatment device of claim 1, characterized in that: and a drain outlet at the bottom of the inclined plate sedimentation zone of the inclined plate sedimentation tank is discharged to a sludge treatment process through a drain pipe, a pneumatic angle valve and a sludge pump.
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| CN201921837822.XU CN211339084U (en) | 2019-10-29 | 2019-10-29 | Coal chemical industry gasification sewage pretreatment device |
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| CN201921837822.XU CN211339084U (en) | 2019-10-29 | 2019-10-29 | Coal chemical industry gasification sewage pretreatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117865420A (en) * | 2024-03-11 | 2024-04-12 | 中天合创能源有限责任公司 | Equipment and method for treating ammonia nitrogen in sewage of coal chemical gasification process by membrane technology |
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2019
- 2019-10-29 CN CN201921837822.XU patent/CN211339084U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117865420A (en) * | 2024-03-11 | 2024-04-12 | 中天合创能源有限责任公司 | Equipment and method for treating ammonia nitrogen in sewage of coal chemical gasification process by membrane technology |
| CN117865420B (en) * | 2024-03-11 | 2024-05-10 | 中天合创能源有限责任公司 | Equipment and method for treating ammonia nitrogen in sewage of coal chemical gasification process by membrane technology |
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