CN114262072A - Self-adaptive hardness-reducing type ash water scale inhibition and dispersion agent for coal gasification black ash water and application - Google Patents
Self-adaptive hardness-reducing type ash water scale inhibition and dispersion agent for coal gasification black ash water and application Download PDFInfo
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Abstract
The invention discloses a self-adaptive hardness-reducing type grey water scale inhibition and dispersion agent for coal gasification black grey water and application thereof, wherein the self-adaptive hardness-reducing type grey water scale inhibition and dispersion agent comprises the following contents: by optimizing the type, group, structure and molecular weight of the grey water scale inhibition and dispersion agent and controlling the corresponding pH interval, the hardness-reduced grey water scale inhibition and dispersion agent plays a role in scale inhibition and dispersion in a grey water section, plays a role in crystal nucleus and coagulation assistance in a flash evaporation and black water clarification section, effectively reduces the hardness of a grey water system, enables the grey water system to operate well under the existing scale inhibition and dispersion-crystal mud sedimentation system, does not need to be provided with an additional device for removing the hardness, reduces the complexity of the design of the grey water system, and reduces the investment and operating cost of enterprises.
Description
The application is a divisional application of Chinese patent application with the application date of 2019, 31.1.78 and the application number of 201910097782.8, and the invention name of the invention is 'an adaptive hardness-reducing type ash water scale inhibition and dispersion agent for coal gasification black ash water and application'.
Technical Field
The invention belongs to the operation field of a crystal mud sedimentation-scale inhibition dispersion binary system of a coal gasification black ash water system, and particularly relates to a self-adaptive hardness-reducing type ash water scale inhibition and dispersion agent for coal gasification black ash water and application thereof.
Background
The coal gasification black water is added with a grey water dispersing agent and returns to a system after flash evaporation and flocculation, and the grey water has the characteristics of high alkalinity, high hardness, high temperature, high pressure, large change before and after PH flash evaporation, multiple contact with process medium coal ash and the like, which are different from a circulating water system. Therefore, neither the chemicals nor the management methods suitable for circulating water systems are suitable for grey water systems.
Generally we use the langerhans coefficient (k value) to measure the fouling propensity of various fouling factors in water. The k value can be simply expressed as the product of calcium ions and alkalinity, and when the scale inhibiting and dispersing agent is added into a grey water system, the tolerable degree of the k value is improved. Under the condition that no medicament is added, mature documents of the tolerable K value of a water system can be referred to, and the tolerable K value of the water system has a trend of obviously reducing along with the increase of the pH value when the pH value exceeds 8.
The common grey water treatment scale inhibition and dispersion agent is a product formed by compounding and mixing one or more monomers, and mainly comprises a phosphorus-containing multi-element polymer and a phosphorus-free radical multi-element carboxylic acid polymer.
The scale inhibition function of phosphorus-containing multipolymers (PBTCA, HEDP and the like) represented by organic phosphine mainly depends on the strong chelating action of phosphonic acid groups and calcium ions, the hardness of a grey water system is improved by the calcium ions chelated by the phosphonic acid groups and free calcium ions together, and chelating medicaments (organic phosphine and EDTA systems) are basically hardening medicaments.
For the water quality of the original type, such as circulating water, the chelating agent has the advantage of good dosage saving effect, because the hardness of the water quality of the original type comes from the water itself. However, chelating agents are not suitable for coal gasification grey water as an exogenous water quality. Since in grey water the source of hardness is not primarily from the water itself, but mostly from the ash and process media of the coal. Particularly, the gasification furnace is in an acid environment, a large amount of calcium and magnesium ions are dissolved into ash water from ash, if a chelate scheme is adopted, the hardness of the water is higher and higher, and when the working condition of the system is abnormal, a large amount of scale formation can occur instantly.
Polyacrylic acids and their derivatives (including polymaleic acid, maleated copolymers, binary, ternary, phosphono copolymers, etc.) contain carboxylic acid groups, hydroxyl groups, ester functional groups and hardness ions calcium and magnesium which are weakly chelating, i.e., not relying on strong energy (chemical bonding forces), but rather on molecular forces (van der waals forces), which do not hinder the formation of calcium carbonate crystallites. However, in the process of forming the microcrystals, the direction of the microcrystals growth and the crystal form are distorted into irregular shapes due to the presence of polyacrylic acid and derivatives thereof, and the microcrystals are easily dispersed by water flow and have fluidity. This is what we say as the dispersing property.
The following are typical calcium carbonate crystal forms of polyacrylic acid and ATMP as shown in fig. 1.
It can be seen that the crystal form of ATMP is typically spherical, while the crystal form of polyacrylic acid is streamlined. The organic phosphonic acid represented by HEDP is in a locking state to calcium ions, and the possibility of combination with carbonate is eliminated, which is the root cause of higher and higher grey water hardness. Moreover, the agents based on HEDP form very dense scale flakes when the hardness is high to a certain degree.
And polycarboxylic acid-based multipolymer carboxylate attracts calcium ions with weak force, does not hinder the combination of the calcium ions and carbonate, and finally leaves the system in the crystal nucleus of the dispersant when the calcium ions and the carbonate are crystallized and carried away by streamline dispersant molecules.
By implanting different groups in polyacrylic acid, different functions can be achieved. For example, ester functional groups and hydroxyl functional groups have certain effects on mud, sulfonic acid groups bring hydrophilicity and dispersion performance, and a small amount of phosphonic acid groups are introduced, so that the water-soluble calcium and magnesium ions can be captured while the dispersion function is realized. If the fluid sludge and microcrystals can be separated in a post-process, it is clear that the hardness of the water system is significantly reduced by the calcium ions carried away by the phosphonic acid and carboxylic acid groups of the grey water dispersant as nuclei.
According to the research and practice of Mr. Teng, polyacrylic acid and derivatives thereof have certain differences in different molecular weights and structures, the low molecular weight (800-.
Fig. 3 is a schematic diagram of a flow of slag-ash water of a conventional pulverized coal gasification device, and it can be seen that after slag and mud microcrystals of coal gasification are separated in a settling tank, calcium and magnesium ions and alkalinity are relatively in high concentration at a section from a gray water collecting tank to a deaerator, and then water is randomly sealed and supplemented, and the hardness and alkalinity should be in a continuous descending trend under normal conditions, so that the main task of the gray water in the section is a scale inhibition function.
At the beginning of the deaerator and the washing tower, the temperature and the pressure of the grey water begin to rise greatly, and the bicarbonate is inevitably decomposed into carbonate under high temperature and high pressure. Therefore, the formation of calcium carbonate is unavoidable, and the main task of the subsequent greywater is the dispersing function.
After the washing tower is used for washing gas, under the acidic environment rich in carbon dioxide, a part of calcium and magnesium in the coal ash enters the grey water, the concentration of calcium and magnesium ions is increased again, but the pH value is acidic due to the existence of the rich carbon dioxide, and scaling cannot be formed. However, after the black water is subjected to flash evaporation, the acid gas is separated sharply, the alkalinity of the system is rapidly increased, and a large amount of calcium carbonate microcrystals are formed in the working section. A large amount of dispersant is required.
In the last step, the microcrystal distorted by the molecular lattice of the dispersing agent is well separated from mud and slag in a settling tank, and the specific molecular weight and functional group of the grey water dispersing agent have a structure similar to that of PAM, so that the grey water dispersing agent is easily captured by PAM due to the action of molecular force, has the coagulation assisting effect, reduces suspended matters in a grey water system, and simultaneously reduces the hardness. The crystal mud sedimentation-scale inhibition dispersion binary system with virtuous cycle is characterized in that the hardness of the grey water returned to the grey water collecting tank is reduced, the grey water dispersing agent added into the system improves the alkalinity, and the grey water system can be infinitely circulated in the self-adaptive hardness reduction system.
The self-adaptive hardware reducing system does not need to build any hardness removing device or add other acid and alkali besides adding the grey water dispersing agent and the crystal mud settling agent, thereby avoiding the waste of capital construction and reducing the burden of the subsequent concentrated salt water and salt.
The existing commercial grey water dispersing agent mainly follows the experience of circulating water, and the molecular weight of the formula functional group is set from the experience of circulating water. A series of problems arise with the application to grey water systems. For example, the hardness is higher, for example, the suspended matter is ultrahigh.
The circulating water system is an autonomous system, the calcium source and the alkalinity source are both from water supplement, the coal gasification grey water system is an exogenous system, the hardness is mostly from coal ash dissolved in the acidic environment of the gasification furnace, and the alkalinity is mostly from process media. Therefore, the scale inhibition scheme of the circulating water system emphasizes chelation, namely, the scale inhibitor is used for chelating calcium as much as possible, the tolerance of the calcium is greatly improved, the k value is improved, partial calcium and alkalinity are taken away by drainage, and the method is feasible and has the advantages of saving the using amount and having good effect. However, if a chelating method is adopted in the gasified ash water system, a large amount of solid coal ash is dissolved in water in the acidic environment of the gasification furnace, the water hardness saturation is too high, calcium carbonate precipitates are formed instantly after the subsequent flash evaporation phase change process, a large amount of scale formation is caused on pipelines and equipment, and the gasification furnace is also seriously blocked in serious cases, so that the system is stopped and overhauled.
In addition, the commercial grey water dispersing agent is rated to have good scale inhibition effect between the pH value of 7-9, but actually, the gasification device in the interval cannot realize long-period stable operation.
In addition, the chelating grey water dispersing agent generally has a small molecular weight, so that suspended particles formed in the link of a settling tank are too small to be easily flocculated by PAM, the grey water can only run under high turbidity, high hardness and high alkalinity, and the grey water conveyed to a sewage system for treatment is difficult to treat, which brings more troubles.
Therefore, the designed commercial grey water dispersing agent cannot be well applicable to a coal gasification grey water flocculation-scale inhibition dispersion binary system by continuing the experience of circulating water.
Disclosure of Invention
Aiming at the defects of the existing problems, the invention aims to provide a self-adaptive hardness-reducing type grey water scale inhibition and dispersion agent for coal gasification black grey water and application thereof, so that enterprises do not need additional hardness reducing devices, the process complexity of gasification grey water is reduced, and the investment and the operating cost of the enterprises are reduced.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a coal gasification black grey water self-adaptive hardness-reducing grey water scale inhibition and dispersion agent mainly comprises one or more of polyacrylic acid, polymaleic acid, maleic acid-acrylic acid copolymer, AA/AMPS/HPA terpolymer, T-225, polyepoxysuccinic acid, polyaspartic acid, PBTCA, phosphoryl copolymer, AA/AMPS and maleic styrene sulfonate copolymer, and is diluted to a solution with the solid content of 25-40% by adding water;
the hardness-reducing grey water scale inhibition and dispersion agent contains sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups; the ratio of the sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups, and ester groups is 10: 10-250: 3-25: 50-300: 0-25: 3-50.
As a preferred technical scheme of the application, the average molecular weight of the hardness-reducing type grey water scale inhibition and dispersion agent is 1000-10000.
As a preferred technical scheme of the application, the molecular weight of the unit effective group of the hardness-reducing type grey water scale inhibition and dispersion agent is 50-100; wherein, the unit effective group molecular weight is equal to the scale inhibition dispersant molecular weight/functional group number; the functional groups include sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups, and ester groups.
As a preferred technical scheme of the application, when the hardness-reducing grey water scale inhibition and dispersion agent is used, the pH value of the grey water is controlled to be 8.1-8.6.
As the preferable technical scheme of the application, when the hardness-reducing type grey water scale inhibition and dispersion agent is used, the temperature is controlled to be 0-60 ℃.
The invention also protects the application of the self-adaptive hardness-reducing type grey water scale inhibition and dispersion agent for the coal gasification black grey water in a self-adaptive hardness-reducing system for the coal gasification black grey water.
As a preferred technical scheme of the application, the method specifically comprises the following steps that the hardness-reducing type grey water scale inhibition and dispersion agent is sent to an overflow pipe of a clarification tank through a dispersion agent pump and then sent to a grey water tank and an inlet of a low-pressure grey water pump/waste water pump.
As a preferred technical scheme of the application, the method comprises the following specific steps:
(1) adding a hardness-reducing ash water scale inhibition and dispersion agent A before and during the formal operation of the coal gasification device, wherein the hardness-reducing ash water scale inhibition and dispersion agent A is pressurized by a dispersion agent pump, one path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to an overflow pipe of a clarification tank, the other path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to an inlet of a low-pressure ash water pump/waste water pump, the other path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to an outlet of the low-pressure ash water pump/waste water pump, or after the hardness-reducing ash water scale inhibition and dispersion agent A is pressurized by the dispersion agent pump, the other path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to the overflow pipe of the clarification tank, the other path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to the inlet of the low-pressure ash water pump/waste water pump, the other path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to the outlet of the clarification tank, or is sent to the overflow pipe of the clarification tank after being pressurized by the dispersion agent pump, one path of the overflow pipe of the clarification tank, the waste water pump, and one path of the inlet of the low-pressure of the low-reducing ash water pump;
(2) after the coal gasification device is formally operated, adding a hardness-reducing type ash water scale inhibition and dispersion agent B, pumping the hardness-reducing type ash water scale inhibition and dispersion agent B into an outlet of a low-pressure ash water pump/waste water pump through a dispersion agent pump, or pumping the hardness-reducing type ash water scale inhibition and dispersion agent B into the inlet of the low-pressure ash water pump and the outlet of the low-pressure ash water pump through the dispersion agent pump, mixing the hardness-reducing type ash water scale inhibition and dispersion agent B with ash water, and returning the mixture to a gasification system;
wherein the hardness-reducing grey water scale inhibition and dispersion agent A contains sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups; the ratio of the sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups, and ester groups is 10: 10-150: 3-15: 50-250: 0-15: 3-10;
wherein the hardness-reducing grey water scale inhibition and dispersion agent B contains sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups; the ratio of the sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups, and ester groups is 10: 50-250: 3-10: 50-300: 5-25: 5-50.
As a preferable technical scheme of the application, the average molecular weight of the hardness-reducing type grey water scale inhibition and dispersion agent A is 1000-3000, and the average molecular weight of the hardness-reducing type grey water scale inhibition and dispersion agent B is 2000-10000.
The invention also comprises the following:
the hardness-reducing grey water scale inhibition and dispersion agent contains sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups; the ratio of the sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups, and ester groups is 10: 10-250: 3-25: 50-300: 0-25: 3-50.
wherein, the unit effective group molecular weight is equal to the scale inhibition dispersant molecular weight/functional group number; the functional groups include sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups, and ester groups.
Item 4. the coal gasification black grey water self-adaptive hardness-reducing grey water scale inhibition and dispersion agent according to item 1, which is characterized in that when the hardness-reducing grey water scale inhibition and dispersion agent is used, the pH value of black grey water is controlled to be 8.1-8.6.
Item 6. application of the coal gasification black grey water adaptive hardness-reducing grey water scale inhibition and dispersion agent described in any one of items 1 to 5 in a coal gasification black grey water adaptive system.
Item 7. the use according to item 6, characterized by the specific steps of pumping a hardness-reducing grey water scale inhibiting dispersant through the dispersant into the overflow pipe of the clarifier and then into the grey water tank and the inlet of the low pressure grey water pump/wastewater pump.
Item 8. the use according to item 6, characterized by the following specific steps:
(1) adding a hardness-reducing ash water scale inhibition and dispersion agent A before and during the formal operation of the coal gasification device, wherein the hardness-reducing ash water scale inhibition and dispersion agent A is pressurized by a dispersion agent pump, one path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to an overflow pipe of a clarification tank, the other path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to an inlet of a low-pressure ash water pump/waste water pump, the other path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to an outlet of the low-pressure ash water pump/waste water pump, or after the hardness-reducing ash water scale inhibition and dispersion agent A is pressurized by the dispersion agent pump, the other path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to the overflow pipe of the clarification tank, the other path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to the inlet of the low-pressure ash water pump/waste water pump, the other path of the hardness-reducing ash water scale inhibition and dispersion agent A is sent to the outlet of the clarification tank, or is sent to the overflow pipe of the clarification tank after being pressurized by the dispersion agent pump, one path of the overflow pipe of the clarification tank, the waste water pump, and one path of the inlet of the low-pressure of the low-reducing ash water pump;
(2) after the coal gasification device is formally operated, adding a hardness-reducing type ash water scale inhibition and dispersion agent B, pumping the hardness-reducing type ash water scale inhibition and dispersion agent B into an outlet of a low-pressure ash water pump/waste water pump through a dispersion agent pump, or pumping the hardness-reducing type ash water scale inhibition and dispersion agent B into the inlet of the low-pressure ash water pump and the outlet of the low-pressure ash water pump through the dispersion agent pump, mixing the hardness-reducing type ash water scale inhibition and dispersion agent B with ash water, and returning the mixture to a gasification system;
wherein the hardness-reducing grey water scale inhibition and dispersion agent A contains sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups; the ratio of the sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups, and ester groups is 10: 10-150: 3-15: 50-250: 0-15: 3-10;
wherein the hardness-reducing grey water scale inhibition and dispersion agent B contains sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups; the ratio of the sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups, and ester groups is 10: 50-250: 3-10: 50-300: 5-25: 5-50.
Item 9. the use according to item 8, characterized in that the average molecular weight of the hardness-reducing grey water scale inhibition and dispersion agent A is 1000-3000, and the average molecular weight of the hardness-reducing grey water scale inhibition and dispersion agent B is 2000-10000.
Advantageous effects
Compared with the prior art, the self-adaptive hardness-reducing type grey water scale inhibition and dispersion agent for the coal gasification black grey water and the application thereof provided by the invention have the following beneficial effects: the invention obviously reduces the hardness of the grey water by improving the grey water scale inhibition and dispersion agent and the adding process thereof, thereby achieving good scale inhibition and dispersion effects.
Drawings
FIG. 1 is an electron micrograph of calcium carbonate crystals of polyacrylic acid and ATMP;
FIG. 2 is a schematic diagram of the chelating structure of a scale inhibitor and calcium carbonate;
FIG. 3 is a simplified slag ash flow diagram for a typical pulverized coal gasification unit;
FIG. 4 is a process flow diagram of adding the scale inhibition and dispersion agent with the low-pressure ash water pump and the wastewater pump independent from each other.
Detailed Description
The present invention will be described in further detail with reference to examples. The reagents or instruments used are not indicated by manufacturers, and are regarded as conventional products which can be purchased in the market.
Example 1:
the formula of the hardness-reducing grey water scale inhibition and dispersion agent A in the embodiment is as follows: polymaleic acid acrylic acid 100, PESA100, AA/AMPS binary terpolymer 300, maleic styrene sulfonate copolymer 200, wherein the ratio of the sulfonic acid groups, carboxylic acid groups, carbonyl groups, phosphonic acid groups, and ester groups is 10: 150: 230: 0: diluting the solution with water at the temperature of 15 and 50 ℃ to obtain a solution with solid content (25 percent); the average molecular weight of the hardness-reducing type grey water scale inhibition and dispersion agent A is 2000.
The formula of the hardness-reducing grey water scale inhibition and dispersion agent B in the embodiment is as follows: PBTCA50, AA/AMPS binary terpolymer 100, PAA 100, T225450, phosphono copolymer 100, wherein the ratio of sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups is 10: 150: 15: 200: 20: adding water at the temperature of 25 ℃ and diluting the solution to obtain a solution with the solid content of 25%; the average molecular weight of the hardness-reducing grey water scale inhibition and dispersion agent B is 6000.
The molecular weight of the unit effective group of the two hardness-reducing type grey water scale inhibition and dispersion agents B is 60-70.
The pH value of the grey water system is controlled between 8.1 and 8.3.
The hardness-reducing scale inhibition and dispersion agent is applied to a multi-nozzle coal gasification device in a Jiangsu Sopp group methanol plant in 10 months in 2014, as shown in a process flow chart of figure 4, after being pressurized to 0.5Mpa by a dispersion agent pump, a hardness-reducing grey water scale inhibition and dispersion agent A is conveyed to a position 1 of an overflow pipe of a settling tank, one path of the hardness-reducing grey water scale inhibition and dispersion agent A is conveyed to a position 2 of an inlet 2 of a waste water pump, the adding amount of the hardness-reducing grey water scale inhibition and dispersion agent A is respectively 70ppm and 20ppm, and the hardness-reducing grey water scale inhibition and dispersion agent A is mixed with grey water and then discharged to a sewage treatment device; the hardness-reducing type grey water scale inhibition and dispersion agent B is pumped into the inlet 4 of the low-pressure grey water pump through a dispersion agent pump, the dosage of the 4 is 20ppm, and the 4 is mixed with the grey water and then returns to a gasification system.
Since the operation of 1 month in 2014, the system is well managed, the shutdown caused by the system fouling does not occur, the calcium hardness is between 300 and 600, and the alkalinity is between 400 and 500.
Example 2:
in the embodiment, the hardness-reducing type grey water scale inhibition and dispersion agent is used in a single-point feeding mode, and the formula of the agent is as follows: PBTCA 50; AA/AMPS binary terpolymer 100; phosphonic acid based polyacrylic acid 100; polyaspartic acid 400; t225200; wherein the ratio of the sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups, and ester groups is 10: 100: 15: 150: 20: adding water at the temperature of 25 ℃ and diluting the solution to obtain a solution with the solid content of 25%; the average molecular weight of the hardness-reducing grey water scale inhibition and dispersion agent is 3000.
The molecular weight of the unit effective group of the hardness-reducing type grey water scale inhibition and dispersion agent is 90.
Controlling the pH value of the grey water to be 8.3-8.6.
The hardness-reducing type grey water scale inhibition and dispersion agent is applied to a new chemical industry limited company of Renbeltin, adopts a single-point adding mode, is pumped into a settling pond overflow pipe through a dispersion agent pump, and is transported to a grey water tank and a low-pressure water return pump/waste water pump inlet. The system is well managed since the operation, no obvious scaling of pipelines and equipment is found in the overhaul, the calcium hardness is between 300 and 600, and the total alkalinity is between 250 and 350.
And (3) comparison test:
the operation results of the hardness-reducing type grey water scale inhibition and dispersion agent used by me and the commercial grey water dispersion agent on respective devices are compared, and the data are as follows:
| location of a site | Dosing | Turbidity and suspended matter | Hardness of calcium | Total alkalinity | Results | Discharge of water | |
| I am example | Jiangsu Sorpu | I am | 20-50 | 400-600 | 300-450 | Long period stable operation | 15％ |
| I am example | Chemical engineering of gold | I am | 20-50 | 300-700 | 250-350 | Long period stable operation | 10％ |
| Comparative example | Internal Mongolian medicine | Is commercially available | 60-120 | 1200-1600 | 300-400 | Frequent blockage for overhaul | 25％ |
| Comparative example | Nanjing zhi | Is commercially available | 40-80 | 900-1100 | 300-400 | Double sleeve for ash and water pipe | 15％ |
| Comparative example | Anhui a certain Source company | Is commercially available | 60-150 | 800-1100 | 300-450 | Frequent blockage for overhaul | 20％ |
As can be seen from the table, compared with the commercially available grey water dispersing agent, the hardness-reducing grey water scale inhibition and dispersion agent basically runs well within the controllable hardness index range, and is a model for long-period stable operation of the industry.
The protection of the present invention is not limited to the above embodiments. Variations and advantages that may occur to those skilled in the art may be incorporated into the invention without departing from the spirit and scope of the inventive concept and the scope of the appended claims is intended to be protected.
Claims (10)
1. The self-adaptive hardness-reducing type grey water scale inhibition and dispersion agent for the coal gasification black grey water is characterized by comprising the following components in parts by weight:
the hardness-reducing type grey water scale inhibition and dispersion agent comprises a single substance or a mixture of carboxylic acid polymers, and the average molecular weight is 1000-10000;
the hardness-reducing grey water scale inhibition and dispersion agent contains carboxylic acid groups and at least one selected from sulfonic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups.
2. The coal gasification black grey water self-adaptive hardness-reducing grey water scale inhibition and dispersion agent according to claim 1, which is characterized in that:
the hardness-reducing grey water scale inhibition and dispersion agent comprises one or more of polyacrylic acid, polymaleic acid, maleic acid-acrylic acid copolymer, AA/AMPS/HPA terpolymer, T-225, polyepoxysuccinic acid, polyaspartic acid, PBTCA, phosphoryl copolymer, AA/AMPS and maleic styrene sulfonate copolymer;
the molar ratio of sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups in the hardness-reducing grey water scale inhibition and dispersion agent is 0-10: 10-250: 0-25: 50-300: 0-25: 0-50.
3. The coal gasification black grey water adaptive hardness-reducing grey water scale inhibition and dispersion agent according to claim 1, wherein the unit effective group molecular weight of the hardness-reducing grey water scale inhibition and dispersion agent is 50-100;
wherein, the unit effective group molecular weight is equal to the scale inhibition dispersant molecular weight/functional group number; the functional groups include sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups, and ester groups.
4. The coal gasification black grey water adaptive hardness-reducing grey water scale inhibition and dispersion agent according to claim 1, wherein when the hardness-reducing grey water scale inhibition and dispersion agent is used, the pH value of black grey water is controlled to be 8.1-8.6.
5. The application of the coal gasification black grey water adaptive hardness-reducing grey water scale inhibition and dispersion agent of any one of claims 1 to 4 in a coal gasification black grey water adaptive system.
6. The application of claim 5, which is characterized by comprising the following specific steps of pumping the hardness-reducing grey water scale inhibition and dispersion agent into an overflow pipe of a clarification tank through a dispersion agent pump, and then delivering the dispersion agent into a grey water tank and an inlet of a low-pressure grey water pump/wastewater pump.
7. Use according to claim 5, characterized in that:
adding a hardness-reducing ash water scale inhibition and dispersion agent A into the coal gasification device, pressurizing the hardness-reducing ash water scale inhibition and dispersion agent A by a dispersion agent pump, conveying the mixture to an overflow pipe of a clarification tank, conveying the mixture to a low-pressure ash water pump/waste water pump, or pressurizing the mixture by a dispersion agent pump, conveying the mixture to the overflow pipe of the clarification tank, conveying the mixture to a waste water pump, mixing the mixture with ash water, and discharging the mixture to a sewage treatment device;
the hardness-reducing grey water scale inhibition and dispersion agent A contains a sulfonic acid group, a carboxylic acid group, a hydroxyl group, a carbonyl group, a phosphonic acid group and an ester group; the ratio of the sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups is from 0 to 10: 10-150: 0-15: 50-250: 0-15: 3-10.
8. The use as claimed in claim 7, wherein the average molecular weight of the hardness-reducing grey water scale inhibiting and dispersing agent A is 1000-3000.
9. Use according to claim 5 or 7, characterized in that:
adding a hardness-reducing type grey water scale inhibition and dispersion agent B into the coal gasification device, wherein the hardness-reducing type grey water scale inhibition and dispersion agent B is conveyed to the outlet of a low-pressure grey water pump/waste water pump through a dispersion agent pump or is conveyed to the inlet of the low-pressure grey water pump and the outlet of the low-pressure grey water pump through the dispersion agent pump, and returns to a gasification system after being mixed with grey water;
the hardness-reducing grey water scale inhibition and dispersion agent B contains a sulfonic acid group, a carboxylic acid group, a hydroxyl group, a carbonyl group, a phosphonic acid group and an ester group; the ratio of the sulfonic acid groups, carboxylic acid groups, hydroxyl groups, carbonyl groups, phosphonic acid groups and ester groups is from 0 to 10: 50-250: 0-10: 50-300: 5-25: 0-50.
10. The application as claimed in claim 9, wherein the average molecular weight of the hardness-reducing grey water scale inhibition and dispersion agent A is 1000-3000, and the average molecular weight of the hardness-reducing grey water scale inhibition and dispersion agent B is 2000-10000.
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| CN110806368A (en) * | 2019-11-14 | 2020-02-18 | 兖矿水煤浆气化及煤化工国家工程研究中心有限公司 | Method for rapidly evaluating dispersibility of scale inhibition and dispersion agent for gasified grey water |
| CN111995114B (en) * | 2020-08-25 | 2024-03-22 | 北京翰祺环境技术有限公司 | Coal gasification black ash water treatment method and treatment system |
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