A water treatment agent and a water treatment method for a steamless cyclone separator boiler

Abstract

The present application relates to a kind of water treatment agent and water treatment method of no steam water cyclone separator boiler, the water treatment agent of no steam water cyclone separator boiler includes: first amine, second amine, dispersing agent, auxiliary agent and solvent;The molecular weight of the first amine is less than the molecular weight of the second amine;The auxiliary agent includes dimethylformamide and / or benzene sulfonate.The water treatment agent provided by the present application, by adjusting the formula of water treatment agent, by the synergistic effect between each component in water treatment agent formula, so that after adding the water treatment agent in boiler water, it can be guaranteed that in the superhigh pressure boiler without design steam water cyclone separator, the saturated steam sodium ion in drum meets the requirement ≤1 μg / kg.

Description

Technical Field

[0001] This invention relates to the field of boiler water treatment technology, specifically to a water treatment agent and water treatment method for a steam-free cyclone separator boiler. Background Technology

[0002] Currently, in ultra-high pressure boilers, steam-water cyclone separators are often installed in the steam drum to reduce the steam moisture content during operation. Moreover, the number of steam-water cyclone separators must meet the load capacity to achieve the purpose of reducing steam water carryover and ensuring that the sodium ion content of saturated steam is within acceptable limits.

[0003] For example, CN204534529U discloses a steam drum for a power plant boiler, including a steam drum body, a liner, and a cyclone separator. The liner has a fixed support, and the fixed support and the end of the tangential inlet pipe of the cyclone separator have flanges. The lower part of the flange of the fixed support has a V-groove, and the side of the flange of the fixed support away from the cyclone separator body has a side baffle. The lower part of the flange of the tangential inlet pipe is embedded in the V-groove of the flange of the fixed support. The side baffle blocks the side of the flange of the fixed support. A pin is inserted into the pin hole of the fixed support and the flange of the tangential inlet pipe. The pin has a pin hole, and a pin plate is inserted into the pin hole. The pin plate is wedge-shaped.

[0004] However, some current ultra-high pressure boilers do not have a steam-water cyclone separator. The steam-water separation device uses an arc baffle for primary steam-water separation and a wire mesh for secondary separation. When the boiler water treatment uses low phosphate treatment, the saturated steam sodium ion content frequently exceeds the standard when the steam drum operating water level is at the design level. During the first three years of operation of a new unit, the turbine was forced to have its high and medium pressure cylinders opened twice to flush out the salt accumulation in the flow parts.

[0005] In summary, existing technologies for ultra-high pressure boilers that do not have a steam-water cyclone separator for water treatment suffer from the defect of excessively high sodium ion levels in the steam drum, which leads to increased pressure in the turbine regulating stage and reduces the turbine's power generation efficiency and utilization rate. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a water treatment agent and water treatment method for boilers without steam-water cyclone separators, so as to solve the problem of excessive sodium ion concentration in the steam drum when water treatment is carried out in ultra-high pressure boilers without steam-water cyclone separators, which leads to an increase in the pressure of the turbine regulating stage and reduces the power generation efficiency and utilization rate of the turbine.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a water treatment agent for a steam-free cyclone separator boiler, the water treatment agent for the steam-free cyclone separator boiler comprising:

[0009] Primary amine, secondary amine, dispersant, additives and solvent;

[0010] The molecular weight of the first amine is less than the molecular weight of the second amine;

[0011] The adjuvants include dimethylformamide and / or benzenesulfonate.

[0012] The water treatment agent provided by this invention, by adjusting the formulation of the water treatment agent and utilizing the synergistic effect between the components in the formulation, ensures that the sodium ion content in the saturated steam of an ultra-high pressure boiler without a steam-water cyclone separator meets the requirement of ≤1μg / kg after adding the water treatment agent to the boiler water.

[0013] As a preferred embodiment of the present invention, the first amine includes one or a combination of at least two of liquid ammonia, morpholine, monoethanolamine, cyclohexylamine, or diethylaminoethanol.

[0014] As a preferred embodiment of the present invention, the second amine includes one or a combination of at least two of oleylamine, coconut oil fatty acid diethanolamide, oleylpropanediamine, or octadecylamine.

[0015] As a preferred embodiment of the present invention, the dispersant includes one or a combination of at least two of the following: a carboxylic acid-sulfonic acid-acrylate terpolymer, an acrylic acid-acrylate-sulfonate terpolymer, an acrylic acid-sulfonic acid-amide copolymer, or a carboxylic acid-sulfonic acid-nonionic terpolymer.

[0016] As a preferred embodiment of the present invention, the benzenesulfonate includes sodium benzenesulfonate and / or potassium benzenesulfonate.

[0017] As a preferred embodiment of the present invention, the solvent includes water.

[0018] As a preferred embodiment of the present invention, the water treatment agent of the steam-free cyclone separator boiler comprises, by weight percentage:

[0019] Primary amine 2.5-10%, secondary amine 2.5-10%, dispersant 2.5-10%, auxiliary agent 0.1-0.5%, balance is solvent.

[0020] Secondly, the present invention provides a water treatment method for a steam-free cyclone separator boiler. The water treatment method includes: preparing and mixing water treatment agents according to the mass percentage ratio of the water treatment agent for the steam-free cyclone separator boiler described in the first aspect to obtain a water treatment agent; adding the obtained water treatment agent to the boiler water; and then controlling the amount of water treatment agent added by detecting the conductivity (SC) and pH value of the boiler water.

[0021] As a preferred technical solution of the present invention, the location of the inlet includes at least one location, and preferably at least two locations.

[0022] As a preferred technical solution of the present invention, the amount of water treatment additive is controlled based on the conductivity SC being 8-8.5 μS / cm and the pH value being 9.3-9.4, which is considered acceptable.

[0023] Compared with existing technical solutions, the present invention has the following beneficial effects:

[0024] (1) The water treatment agent provided by the present invention can achieve corrosion protection of the low-temperature section of the thermal system by adding 0.5-5 ppm of boiler energy-saving agent through the outlet of the condensate pump, prevent the generation of black powder substances such as iron tetroxide, and eliminate the safety accident of valve jamming on the thermal system.

[0025] (2) The water treatment agent provided by the present invention, due to the specific design of the component content, will not produce white precipitate during use, and will not cause excessive hydrogen conductivity of steam after being added to the heating system, thus avoiding the defect that leads to excessive hydrogen conductivity.

[0026] (3) The water treatment agent provided by this invention can ensure that the sodium ion content in the saturated steam of the steam drum is ≤1μg / kg, which is far lower than the control standard of no more than 5μg / kg and the expected value of 2μg / kg in the "Water and Steam Quality Standard for Thermal Power Generating Units and Steam Power Equipment (GB12145-2016)". Using this water treatment agent can save 3 million yuan in boiler modification costs. The cost of using the water treatment agent is consistent with the combined cost of the original deaerator and traditional boiler water treatment agents, without increasing additional costs. Detailed Implementation

[0027] To better illustrate the present invention and facilitate understanding of its technical solutions, typical but non-limiting embodiments of the present invention are as follows:

[0028] This embodiment provides a water treatment agent for a steam-free cyclone separator boiler, the water treatment agent for the steam-free cyclone separator boiler comprising:

[0029] Primary amine, secondary amine, dispersant, additives and solvent;

[0030] The first amine includes one or a combination of at least two of the following: liquid ammonia, morpholine, monoethanolamine, cyclohexylamine, or diethylaminoethanol;

[0031] The second amine includes one or a combination of at least two of oleylamine, coconut oil fatty acid diethanolamide, oleylpropanediamine, or octadecylamine;

[0032] The adjuvants include dimethylformamide and / or benzenesulfonate.

[0033] Specifically, the dispersant includes one or a combination of at least two of the following: a carboxylic acid-sulfonic acid-acrylate terpolymer, an acrylic acid-acrylate-sulfonate terpolymer, an acrylic acid-sulfonic acid-amide copolymer, or a carboxylic acid-sulfonic acid-nonionic terpolymer.

[0034] In this invention, the carboxylic acid-sulfonic acid-acrylate terpolymer is a commercially available aqueous dispersant commonly used in the field, such as the carboxylic acid-sulfonic acid-acrylate terpolymer (AA-AMPS-HPA terpolymer) from Shandong Taihe Technology Co., Ltd.

[0035] In this invention, the acrylic acid-acrylate-sulfonate terpolymer is a commercially available reagent commonly used in the field, such as TH-613 acrylic acid-acrylate-sulfonate terpolymer from Shandong Taihe Technology Co., Ltd.

[0036] In this invention, the acrylic acid-sulfonic acid-amide copolymer is a commercially available reagent commonly used in the field, such as TH-615 acrylic acid-sulfonic acid-amide copolymer from Shandong Taihe Technology Co., Ltd.

[0037] In this invention, the carboxylic acid-sulfonic acid-nonionic terpolymer is a commercially available aqueous dispersant commonly used in the field, such as the carboxylic acid-sulfonic acid-nonionic terpolymer TH-3100 from Shandong Taihe Technology Co., Ltd.

[0038] Specifically, the benzenesulfonate includes sodium benzenesulfonate and / or potassium benzenesulfonate;

[0039] Specifically, the solvent includes water;

[0040] Specifically, the water treatment agent of the steam-free cyclone separator boiler includes, by mass percentage:

[0041] Primary amine 2.5-10%, secondary amine 2.5-10%, dispersant 2.5-10%, auxiliary agent 0.1-0.5%, balance is solvent.

[0042] In this invention, the first amine in the water treatment agent of the steam-free cyclone separator boiler is 2.5-10% by mass percentage, for example, it can be 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5% or 10%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0043] In this invention, the second amine in the water treatment agent of the steam-free cyclone separator boiler is 2.5-10% by mass percentage, for example, it can be 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5% or 10%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0044] In this invention, the dispersant in the water treatment agent of the steam-free cyclone separator boiler is 2.5-10% by mass percentage, for example, it can be 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5% or 10%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0045] In this invention, the additive in the water treatment agent of the steam-free cyclone separator boiler is 0.1-0.5% by mass percentage, for example, it can be 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, or 0.5%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0046] Furthermore, the present invention provides a water treatment method for a steam-free cyclone separator boiler, the water treatment method comprising: preparing and mixing the aforementioned water treatment agent according to the aforementioned mass percentage ratio, adding the obtained water treatment agent to the boiler water, and then controlling the amount of water treatment agent added by detecting the conductivity SC and pH value of the boiler water.

[0047] Specifically, the access points include at least one location, and preferably at least two locations;

[0048] In this invention, the injection point can be selected to be directly injected through the existing boiler's dosing device in the deaerator downcomer, or it can be injected through the condensate pump outlet. Other injection points can be other reasonable injection points commonly used in the field.

[0049] Specifically, the amount of water treatment additive is controlled based on a conductivity (SC) of 8-8.5 μS / cm and a pH of 9.3-9.4.

[0050] The dosage of the added water treatment solution is controlled based on a conductivity (SC) of 8-8.5 μS / cm and a pH of 9.3-9.4. For example, a conductivity (SC) of 8-8.5 μS / cm can be 8 μS / cm, 8.05 μS / cm, 8.1 μS / cm, 8.15 μS / cm, 8.2 μS / cm, 8.25 μS / cm, 8.3 μS / cm, 8.35 μS / cm, 8.4 μS / cm, 8.45 μS / cm, or 8.5 μS / cm, etc., and a pH of 9.3-9.4 can be 9.3, 9.31, 9.32, 9.33, 9.34, 9.35, 9.36, 9.37, 9.38, 9.39, or 9.4, etc., but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0051] In this invention, the amount of water treatment additive is controlled based on a conductivity SC of 8-8.5 μS / cm and a pH value of 9.3-9.4, which is considered qualified. Any value within the specified conductivity SC range and any value within the corresponding pH range can meet the requirements of this invention.

[0052] Furthermore, to illustrate the high efficiency of the water treatment agent for the steam-free cyclone separator boiler provided by this invention, practical examples are used for explanation, as follows:

[0053] Example 1

[0054] This embodiment provides a water treatment agent for a steam-free cyclone separator boiler, wherein the water treatment agent for the steam-free cyclone separator boiler comprises, by weight percentage:

[0055] The composition is as follows: 5% primary amine, 8% secondary amine, 6% dispersant, 0.3% additives, and the remainder is solvent.

[0056] The first amine is cyclohexylamine;

[0057] The second amine is octadecylamine;

[0058] The dispersant is a carboxylic acid-sulfonic acid-acrylate terpolymer (carboxylic acid-sulfonic acid-acrylate terpolymer of Shandong Taihe Technology Co., Ltd.);

[0059] The auxiliary agent is sodium benzenesulfonate.

[0060] The treatment process using the aforementioned water treatment agent is as follows:

[0061] The water treatment method includes: preparing and mixing the aforementioned water treatment agent according to the aforementioned mass percentage ratio, adding the obtained water treatment agent to the boiler water, and then controlling the amount of water treatment agent added by detecting the conductivity SC and pH value of the boiler water.

[0062] The injection point is 1, and the chemical is injected through the existing boiler's dosing device into the deaerator downcomer.

[0063] The dosage of the water treatment additive is controlled based on a conductivity (SC) of 8.4 μS / cm and a pH of 9.3, which is considered acceptable.

[0064] The sodium ion concentration in the saturated steam of the boiler drum after treatment is detailed in Table 1.

[0065] Example 2

[0066] This embodiment provides a water treatment agent for a steam-free cyclone separator boiler, wherein the water treatment agent for the steam-free cyclone separator boiler comprises, by weight percentage:

[0067] The composition is as follows: 8% primary amine, 4% secondary amine, 8% dispersant, 0.2% additives, and the remainder is solvent.

[0068] The first amine is morpholine;

[0069] The second amine is oleylamine;

[0070] The dispersant is a carboxylic acid-sulfonic acid-nonionic terpolymer (TH-3100 carboxylic acid-sulfonic acid-nonionic terpolymer from Shandong Taihe Technology Co., Ltd.);

[0071] The additive is dimethylformamide.

[0072] The treatment process using the aforementioned water treatment agent is as follows:

[0073] The water treatment method includes: preparing and mixing the aforementioned water treatment agent according to the aforementioned mass percentage ratio, adding the obtained water treatment agent to the boiler water, and then controlling the amount of water treatment agent added by detecting the conductivity SC and pH value of the boiler water.

[0074] The injection point is 1, and the chemical is injected through the existing boiler's dosing device into the deaerator downcomer.

[0075] The dosage of the water treatment additive is controlled based on a conductivity (SC) of 8.2 μS / cm and a pH of 9.35, which is considered acceptable.

[0076] The sodium ion concentration in the saturated steam of the boiler drum after treatment is detailed in Table 1.

[0077] Example 3

[0078] This embodiment provides a water treatment agent for a steam-free cyclone separator boiler, wherein the water treatment agent for the steam-free cyclone separator boiler comprises, by weight percentage:

[0079] The composition is as follows: 10% primary amine, 2.5% secondary amine, 2.5% dispersant, 0.1% additives, and the remainder is solvent.

[0080] The first amine is diethylaminoethanol;

[0081] The second amine is oleylpropanediamine;

[0082] The dispersant includes an acrylic acid-sulfonic acid-amide copolymer (TH-615 acrylic acid-sulfonic acid-amide copolymer from Shandong Taihe Technology Co., Ltd.);

[0083] The additive is dimethylformamide.

[0084] The treatment process using the aforementioned water treatment agent is as follows:

[0085] The water treatment method includes: preparing and mixing the aforementioned water treatment agent according to the aforementioned mass percentage ratio, adding the obtained water treatment agent to the boiler water, and then controlling the amount of water treatment agent added by detecting the conductivity SC and pH value of the boiler water.

[0086] The injection points are two: one is through the existing boiler's dosing device, which injects the chemicals into the deaerator downcomer, and the other is at the condensate pump outlet.

[0087] The dosage of the water treatment additive is controlled based on a conductivity (SC) of 8.5 μS / cm and a pH of 9.3, which is considered acceptable.

[0088] The sodium ion concentration in the saturated steam of the boiler drum after treatment is detailed in Table 1.

[0089] Example 4

[0090] This embodiment provides a water treatment agent for a steam-free cyclone separator boiler, wherein the water treatment agent for the steam-free cyclone separator boiler comprises, by weight percentage:

[0091] 2.5% primary amine, 10% secondary amine, 10% dispersant, 0.5% additives, and the remainder is solvent;

[0092] The first amine is monoethanolamine;

[0093] The second amine is coconut oil fatty acid diethanolamide;

[0094] The dispersant is an acrylic acid-acrylate-sulfonate terpolymer (TH-613 acrylic acid-acrylate-sulfonate terpolymer from Shandong Taihe Technology Co., Ltd.);

[0095] The additives are dimethylformamide and sodium benzenesulfonate in a mass ratio of 1:1.

[0096] The treatment process using the aforementioned water treatment agent is as follows:

[0097] The water treatment method includes: preparing and mixing the aforementioned water treatment agent according to the aforementioned mass percentage ratio, adding the obtained water treatment agent to the boiler water, and then controlling the amount of water treatment agent added by detecting the conductivity SC and pH value of the boiler water.

[0098] The injection points are two: one is through the existing boiler's dosing device, which injects the chemicals into the deaerator downcomer and the other is through the condensate pump outlet.

[0099] The dosage of the water treatment additive is controlled based on a conductivity (SC) of 8 μS / cm and a pH of 9.4, which is considered acceptable.

[0100] The sodium ion concentration in the saturated steam of the boiler drum after treatment is detailed in Table 1.

[0101] Example 5

[0102] The only difference from Example 1 is that the injection points are now two: one is through the existing boiler's dosing device at the deaerator downcomer, and the other is at the condensate pump outlet. The sodium ion concentration in the saturated steam of the boiler drum after treatment is detailed in Table 1.

[0103] Comparative Example 1

[0104] The only difference from Example 1 is that the first amine in the water treatment agent is replaced with an equal amount of the second amine. The sodium ion concentration of the saturated steam in the boiler drum after treatment is detailed in Table 1.

[0105] Comparative Example 2

[0106] The only difference from Example 1 is that the second amine in the water treatment agent is replaced with an equal amount of the first amine. The sodium ion concentration of the saturated steam in the boiler drum after treatment is detailed in Table 1.

[0107] Comparative Example 3

[0108] The only difference from Example 1 is that the additive was replaced with an equal amount of sodium dodecylbenzenesulfonate. The sodium ion concentration in the saturated steam of the boiler drum after treatment is detailed in Table 1.

[0109] Comparative Example 4

[0110] The only difference from Example 1 is that the amount of additive added to the water treatment agent is 1%. The sodium ion concentration of saturated steam in the boiler drum after treatment is detailed in Table 1.

[0111] Comparative Example 5

[0112] The only difference from Example 1 is that the amount of additive added to the water treatment agent is 0.05%. The sodium ion concentration of saturated steam in the boiler drum after treatment is detailed in Table 1.

[0113] Table 1

[0114]

[0115]

[0116] The results from the above examples show that the water treatment agent provided by the present invention, by adjusting the formulation of the water treatment agent and utilizing the synergistic effect between the components in the formulation, ensures that when the water treatment agent is added to the boiler water, the sodium ion content in the steam drum of the ultra-high pressure boiler without a steam-water cyclone separator is ≤0.5μg / kg and the iron ion content is ≤5μg / kg, which is significantly lower than the national standard requirements.

[0117] The present invention is described in detail through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions for the components used in the present invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0118] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0119] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0120] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A water treatment agent for a steam- and water-free cyclone separator boiler, characterized in that The water treatment agent of the non-steam-water cyclone separator boiler comprises, in mass percentage: The first amine 2.5-10%, the second amine 2.5-10%, the dispersant 2.5-10%, the auxiliary agent 0.1-0.5%, and the rest is solvent; The molecular weight of the first amine is less than that of the second amine; the first amine comprises one or a combination of at least two of liquid ammonia, morpholine, monoethanolamine, cyclohexylamine or diethylaminoethanol; The second amine comprises one or a combination of at least two of oleylamine, coconut oil fatty acid diethanolamide, oleyl propylenediamine or octadecylamine; The auxiliary agent comprises dimethylformamide and / or benzene sulfonate.

2. The water treatment agent for a once-through water- cyclone separator boiler as set forth in claim 1, characterized by The dispersant comprises one or a combination of at least two of carboxylic acid-sulfonic acid-acrylate terpolymer, acrylic acid-acrylic acid ester-sulfonate terpolymer, acrylic acid-sulfonic acid-amido copolymer or carboxylic acid-sulfonic acid-nonionic terpolymer.

3. The water treatment agent for a once-through water- cyclone separator boiler as set forth in claim 1, characterized by The benzene sulfonate comprises sodium benzene sulfonate and / or potassium benzene sulfonate.

4. The water treatment agent for a once-through water- cyclone separator boiler as set forth in claim 1, characterized by The solvent comprises water.

5. A water treatment method for a steam and water free cyclone separator boiler, characterized in that, The water treatment method comprises: mixing and blending the water treatment agent according to the mass percentage of the water treatment agent of the non-steam-water cyclone separator boiler of any one of claims 1-4 to obtain the water treatment agent, adding the obtained water treatment agent into the boiler water, and then controlling the addition amount of the water treatment agent by detecting the conductivity SC and pH value of the boiler water.

6. The water treatment method for a once-through water- cyclone separator boiler as set forth in claim 5, characterized by The position where the water treatment agent is added comprises at least one position.

7. The water treatment method for a once-through steam drumless cyclone boiler as set forth in claim 5, characterized by, The position where the water treatment agent is added comprises at least two positions.

8. The water treatment method for a once-through steam drumless cyclone boiler as set forth in claim 5, characterized by, The control basis of the addition amount of the water treatment agent is that the conductivity SC is 8-8.5 μS / cm and the pH value is 9.3-9.4.

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