CN111620449A

CN111620449A - Phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent

Info

Publication number: CN111620449A
Application number: CN202010647140.3A
Authority: CN
Inventors: 宋溢文; 盛轶; 刘利捷
Original assignee: Beijing Youjie Technology Co ltd
Current assignee: Beijing Youjie Technology Co ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2020-09-04

Abstract

The invention discloses a phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent, which comprises the following components in percentage by weight: 35-42% of sodium humate, 13-17% of disodium ethylene diamine tetraacetate, 13-18% of sodium polyaspartate, 13-18% of sodium hydroxide, 8-12% of sodium carbonate and 3-6% of auxiliary agent. The phosphorus-free and nitrogen-free environment-friendly hot water boiler water treatment agent provided by the application is phosphorus-free and nitrogen-free, environment-friendly and pollution-free, so that eutrophication and secondary pollution discharge of a water body are avoided. The scale remover has strong penetrating capacity, can penetrate into the contact surface of scale and metal, and has double decomposition effect with calcium and magnesium salts, so that the adhesion force of old scale and the metal surface is reduced and the old scale falls off, the effect of removing the old scale is achieved, and meanwhile, the iron ions in a heat supply network system can be removed. The descaling effect is obvious (can reach 100 percent), and the corrosion inhibition efficiency is more than or equal to 98 percent.

Description

Phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent

Technical Field

The invention relates to the technical field of water treatment agents, in particular to a phosphorus-free nitrogen-free environment-friendly hot water boiler water treatment agent which has the functions of descaling, scale inhibition, corrosion prevention, pre-film protection, removal of organic matters such as microbial algae and the like, water loss prevention, boiler alkali boiling agent, boiler and pipe network non-use maintenance and the like.

Background

At present, the anticorrosion scale inhibitor in the market is various, the state has standard requirements on the quality of water after adding drugs, the drugs can not be unified, the drug market is disordered, the understanding of the heat supply industry on the drug quality and action is not enough, the supervision is not in place, a random product can be added into a pipe network system, the antiscale and anticorrosion effects can not be achieved, sodium hydroxide can be directly added to serve as the anticorrosion scale inhibitor, the boiler and the pipe network can not be cleaned, antiscale and anticorrosion, secondary scale can be generated, the system is scaled and corroded, the heat exchange efficiency of boiler and plate replacement is reduced, the boiler furnace pipe is seriously blown out and the pipe network is leaked, the service lives of the boiler and the pipe network are shortened, and the state property damage is caused. Therefore, the correct selection of the qualified anticorrosive scale inhibitor is the key to ensure the safe operation of the boiler and the pipe network. The selected corrosion and scale inhibitor is a green and environment-friendly water treatment agent with the functions of removing scale, inhibiting scale, preventing corrosion, protecting pre-film, removing organic matters such as microorganism and algae, preventing water loss, boiling the boiler alkali, maintaining the boiler and pipe network and the like.

Disclosure of Invention

The invention provides a phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent.

The invention provides the following scheme:

a phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent comprises the following components in percentage by weight: 35-42% of sodium humate, 13-17% of disodium ethylene diamine tetraacetate, 13-18% of sodium polyaspartate, 13-18% of sodium hydroxide, 8-12% of sodium carbonate and 3-6% of auxiliary agent.

Preferably: the auxiliary agent comprises any one or a mixture of a plurality of dispersing agents, bactericides and pre-filming protective agents.

Preferably: comprises the following components in percentage by weight: 37% of sodium humate, 16% of ethylene diamine tetraacetic acid, 17% of sodium polyaspartate, 16% of sodium hydroxide, 11% of sodium carbonate and 3% of an auxiliary agent.

Preferably: comprises the following components in percentage by weight: 40% of sodium humate, 15% of disodium ethylene diamine tetraacetate, 15% of sodium polyaspartate, 15% of sodium hydroxide, 10% of sodium carbonate and 5% of an auxiliary agent.

Preferably: comprises the following components in percentage by weight: 41% of sodium humate, 14% of disodium ethylene diamine tetraacetate, 14% of sodium polyaspartate, 16% of sodium hydroxide, 11% of sodium carbonate and 4% of an auxiliary agent.

Preferably: when the water treatment agent is used, the water treatment agent is dissolved and then added into the water tank, and the concentration of the water treatment agent in the water tank is controlled to be not more than 10%.

Preferably: when the water treatment agent is used, the dosing frequency is once per week, and the dosing amount is determined according to the weekly water supplement amount and the water supplement quality.

Preferably: when the water treatment agent is used, when no copper equipment is arranged in the system, the pH value of water is controlled to be 10-10.5; when copper equipment is arranged in the system, the pH value of the water is controlled to be 9.5-10.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects:

the phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent can be realized through the invention, and in an implementation mode, the water treatment agent can comprise the following components in percentage by weight: 35-42% of sodium humate, 13-17% of disodium ethylene diamine tetraacetate, 13-18% of sodium polyaspartate, 13-18% of sodium hydroxide, 8-12% of sodium carbonate and 3-6% of auxiliary agent. The phosphorus-free and nitrogen-free environment-friendly hot water boiler water treatment agent provided by the application is phosphorus-free and nitrogen-free, environment-friendly and pollution-free, so that eutrophication and secondary pollution discharge of a water body are avoided. The scale remover has strong penetrating capacity, can penetrate into the contact surface of scale and metal, and has double decomposition effect with calcium and magnesium salts, so that the adhesion force of old scale and the metal surface is reduced and the old scale falls off, the effect of removing the old scale is achieved, and meanwhile, the iron ions in a heat supply network system can be removed. The descaling effect is obvious (can reach 100 percent), and the corrosion inhibition efficiency is more than or equal to 98 percent.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is an electron microscope (electron microscope X25) of scale before dosing according to an embodiment of the present invention;

FIG. 2 is a first electron micrograph (electron micrograph X25) of the scale after the drug is added according to the embodiment of the present invention;

FIG. 3 is a second electron micrograph (electron micrograph X50) of the scale after the drug is added according to the embodiment of the present invention;

fig. 4 is a third electron micrograph (electron micrograph X100) of the scale after the drug is added according to the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

The embodiment of the invention provides a phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent, which comprises the following components in percentage by weight: 35-42% of sodium humate, 13-17% of disodium ethylene diamine tetraacetate, 13-18% of sodium polyaspartate, 13-18% of sodium hydroxide, 8-12% of sodium carbonate and 3-6% of auxiliary agent. Further, the paint comprises the following components in percentage by weight: 37% of sodium humate, 16% of ethylene diamine tetraacetic acid, 17% of sodium polyaspartate, 16% of sodium hydroxide, 11% of sodium carbonate and 3% of an auxiliary agent. Still further, the composition comprises the following components in percentage by weight: 40% of sodium humate, 15% of disodium ethylene diamine tetraacetate, 15% of sodium polyaspartate, 15% of sodium hydroxide, 10% of sodium carbonate and 5% of an auxiliary agent. Furthermore, the paint comprises the following components in percentage by weight: 41% of sodium humate, 14% of disodium ethylene diamine tetraacetate, 14% of sodium polyaspartate, 16% of sodium hydroxide, 11% of sodium carbonate and 4% of an auxiliary agent.

The auxiliary agent comprises any one or a mixture of a plurality of dispersing agents, bactericides and pre-filming protective agents.

When the water treatment agent is used, the water treatment agent is dissolved and then added into the water tank, and the concentration of the water treatment agent in the water tank is controlled to be not more than 10%. When the water treatment agent is used, the dosing frequency is once per week, and the dosing amount is determined according to the weekly water supplement amount and the water supplement quality. When the water treatment agent is used, when no copper equipment is arranged in the system, the pH value of water is controlled to be 10-10.5; when copper equipment is arranged in the system, the pH value of the water is controlled to be 9.5-10.

The water treatment agent mainly comprises a phosphorus-free and nitrogen-free efficient scale inhibitor, a chelating dispersant, a biodegradation agent, an alkaline cleaning agent, a corrosion inhibitor, a bactericide, a pre-film protective agent and other chemical agents, contains various functional groups such as phenolic hydroxyl, sulfonic acid groups, hydroxyl carboxyl, hydroxyl, carbonyl, quinonyl, methoxyl and the like, has a lattice distortion effect on scale forming factors such as calcium carbonate, calcium sulfate and the like in water, ensures that the scale is not easily and firmly adsorbed on the wall of the water treatment agent, is loosely dispersed in the water and shows an excellent scale inhibition effect.

The water treatment agent has the characteristics of high temperature resistance, high scale inhibition rate, difficulty in decomposition and the like, has the effects of corrosion inhibition, old scale stripping, water loss prevention and the like, has good biodegradability, and is a special green environment-friendly corrosion and scale inhibitor for heating water.

The sodium humate is black and powdery, is nontoxic, odorless and noncorrosive, is extremely easy to be water, has no harm to people, and has no pollution to the environment, contains a natural organic matter of aliphatic-aromatic carboxylic acid with a complex composition structure, contains an aromatic ring and an alicyclic ring, is connected with functional groups such as carboxyl, hydroxyl, carbonyl, quinonyl, methoxyl and the like, and has the functions of exchange, adsorption, complexation, chelation and the like with metal ions; the polyelectrolyte in the dispersion system has the functions of agglomeration, peptization, dispersion and the like; under alkaline condition, the sodium ion on its carboxyl or phenolic hydroxyl can exchange with calcium and magnesium ions in water to generate deposit of calcium humate and magnesium to soften water quality; the generated peptizate has the functions of dispersing, adsorbing, complexing and the like on calcium and magnesium salts, so that not only is the growth of crystals prevented, but also the viscosity of generated sludge is small, the fluidity is enhanced, and the sludge is easy to discharge along with pollution discharge; under the alkaline condition, a layer of black protective film can be generated, the film is extremely thin, the structure is compact, the coverage is uniform, the adhesive force is strong, the corrosion-inhibiting protective film is good, and the corrosion-inhibiting effect is really achieved; the agent has strong penetrating action after being dissolved, and can penetrate into the contact surface of the scale and the metal to generate double decomposition action with calcium and magnesium salts, so that the adhesion force of old scale and the metal surface is reduced and the old scale falls off.

The sodium carbonate can reduce calcium and magnesium ions in water, plays a role in scale inhibition, and is used together with sodium hydroxide for adjusting ph under an alkaline condition.

The complexing agent disodium edetate is a good complexing agent, which has six coordinating atoms and forms a complex called a chelate which can complex metal ions.

The polyaspartic acid sodium is a water-soluble polymer, is a novel green water treatment agent, has the characteristics of no phosphorus, no toxicity, no pollution and complete biodegradation, has strong chelating capacity on ions, has double effects of corrosion inhibition and scale inhibition, has good scale inhibition effect on scale forming salts such as calcium carbonate, calcium sulfate, barium sulfate, calcium phosphate and the like, has the scale inhibition rate of 100 percent on the calcium carbonate, has a dispersion effect and can effectively prevent the corrosion of metal equipment; the product is a polypeptide carboxylic acid polymer artificially synthesized in a biomimetic way, and has strong chelation, dispersion and adsorption effects due to the existence of rich amido bond, carboxyl and other active groups in macromolecules.

The pre-filming protective agent, the deoxidant and the like are used for deoxidization and filming of boilers and pipe networks, so that water and metal surfaces are thoroughly isolated, and the function of corrosion prevention is achieved.

According to the properties of various chemicals, various chemical agents are combined, and experiments prove that the environment-friendly water treatment agent is suitable for boilers and pipe networks of heating systems, and has the functions of descaling, pre-film protection and corrosion prevention, removal of organic matters such as microorganism algae and the like, prevention of water loss, boiler alkali-boiling agent and boiler and pipe network maintenance.

The application provides a process for using a water treatment agent, which comprises the following steps:

(1) and the operation of adding medicine

A. After the medicament is dissolved, the medicament is slowly poured into a water tank to prevent water from splashing and hurting people.

B. And determining the later-stage dosage according to the water quality test result.

C. When the water quality of the boiler and the pipe network is unqualified, determining the dosage according to the water capacity and the water quality condition; after the water quality is qualified, dosing is carried out according to the size of the weekly water supplement amount and the water quality of the supplemented water, dosing is carried out once per week, the pH value of the water quality of the system is controlled to be 10-10.5, and the scale removal and film coating effects are the best at the moment; when the system is provided with copper equipment, controlling the pH value of the water quality of the system to be 9.5-10; the water quality index accords with the water quality of industrial boilers GB 1576-2018.

D. The dosing process needs to discharge sewage according to the water quality, and the sewage discharge time is determined according to the appearance and the water quality condition of the heat supply network water. The pollution discharge is closed before adding the medicine, and the medicine is added into the water tank after being completely dissolved, so that the medicine can fully exert the medicine effect.

E. The dosage concentration of the water tank is less than 10% and is completely dissolved, and the concentration can not be greater than 10%;

F. and the dirt remover, the heat exchanger, the water tank and the like are subjected to dirt discharge work regularly according to the test result, and water quality supervision is enhanced to ensure that the water quality is qualified.

(2) Water quality supervision during operation, pollution discharge requirements and medicament use cautions

A. Monitoring the pH value and hardness of the water in the pipe network every day. Recording daily water supplement amount, dosage, cumulative dosage, dosing time, pollution discharge frequency and the like.

B. The water sample is the wet return position, because the water sample is coloured, probably has the interference to the experimental determination result, recommends to filter the postdetermination.

C. Old scale and rust of a pipe network system can be slowly removed in the dosing process, pollution discharge treatment needs to be enhanced, and pollution discharge work is regularly carried out on a dirt remover, a heat exchanger and the like according to a test result. Samples are taken from a water tank drain pipe every week to check whether sediment exists, and if sediment is deposited, the water tank is subjected to pollution discharge treatment until the sediment is clarified.

D. Pollution discharge requirement

(I) And a sewage discharge position: and the heat exchanger, the dirt separator and the plate heat exchanger of the heat station are subjected to dirt discharge.

(II) pollution discharge requirement: the pollution is discharged immediately after the medicine is strictly forbidden, and the medicine is wasted. The heat station plate is used for changing and discharging sewage once every day from the second day after the first dosing, and the 'three-switch and three-switch, hard-switch' impact type sewage discharging method is executed for discharging sewage and back flushing when the sewage is discharged. The method comprises the following specific operations: after the sewage discharging door is fully opened for 3 to 5 seconds, the sewage discharging door is closed for one minute and then opened for 3 to 5 seconds, and sewage is discharged circularly for 3 times; the dirt separator is required to discharge dirt before adding medicine every day, the dirt discharge time is determined according to the water quality, the dirt discharge time is determined according to the size of suspended matters, the dirt discharge is performed for 2-4 hours before adding medicine every day when the suspended matters are unqualified, and the dirt discharge time is reduced as the water quality is improved; when the suspended matters are qualified, the method is executed according to the plate changing and dirt discharging requirement.

(III) determining the pollution discharge times and the pollution discharge end point: the initial stage of adding the medicament can determine the sewage discharge amount and the sewage discharge frequency according to the color of the sewage, and when the sewage is transparent dark brown, the sewage discharge frequency is reduced or the sewage discharge is stopped.

(3) Attention points on the use of drugs

A. The medicament storage requirement is as follows: the medicine is placed in the shade in order, and a wood board or other objects are padded under the medicine to prevent the medicine from being damped and agglomerated.

B. The corrosion and scale inhibitor is alkaline, and when the corrosion and scale inhibitor is used, protective measures are required to be taken, and rubber gloves, protective glasses and masks are required to be worn, so that the corrosion and scale inhibitor is prevented from contacting the skin. If the eye and the skin are not splashed by the eyes and the skin, the eyes and the skin are quickly washed by a large amount of tap water for not less than 15 minutes, then cleaned by 2 percent of dilute boric acid solution or 1 percent of acetic acid solution, and immediately treated after the emergency treatment.

Example 1

A phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent is characterized by comprising the following components in percentage by weight: 37% of sodium humate, 16% of ethylene diamine tetraacetic acid, 17% of sodium polyaspartate, 16% of sodium hydroxide, 11% of sodium carbonate and 3% of an auxiliary agent. The auxiliary agent comprises a dispersing agent, a bactericide and a pre-film protective agent.

Example 2

A phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent is characterized by comprising the following components in percentage by weight: 40% of sodium humate, 15% of disodium ethylene diamine tetraacetate, 15% of sodium polyaspartate, 15% of sodium hydroxide, 10% of sodium carbonate and 5% of an auxiliary agent. The auxiliary agent comprises a dispersing agent, a bactericide and a pre-film protective agent.

Example 3

A phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent is characterized by comprising the following components in percentage by weight: 41% of sodium humate, 14% of disodium ethylene diamine tetraacetate, 14% of sodium polyaspartate, 16% of sodium hydroxide, 11% of sodium carbonate and 4% of an auxiliary agent. The auxiliary agent comprises a dispersing agent, a bactericide and a pre-film protective agent.

The function of the water treatment agent obtained in example 2 was verified.

(1) In the corrosion rate experiment of the boiler suspension corrosion indicator plate, the suspension corrosion indicator plates with different numbers are respectively stored in a boiler water outlet header and an economizer bypass, the water treatment agent obtained in the embodiment 2 is respectively added, the surface corrosion condition of the indicator plate is measured after a certain time, the corrosion rate is obtained by calculation, and the experimental result is shown in the table 1.

TABLE 1 boiler suspension corrosion indicator strip corrosion rate results

(2) Comparative experiments on corrosion rates of various water-replenishing and water-softening agents added to the water treatment agent obtained in example 2 showed results in table 2.

TABLE 2 comparison of Corrosion rates after addition of Water and softened Water with Water treatment agent

(3) In the scale removal capability experiment of the water treatment agent provided in example 2, the water treatment agent obtained in example 2 was added into a scale container, and after a certain period of time, the change of the white precipitate before and after the addition of the water treatment agent was observed by an electron microscope. The observation results are shown in fig. 1 to 4. In FIG. 1, it can be seen that the white precipitate is compact in structure and has no loose phenomenon when observed by an electron microscope 25 times as high as before the water treatment agent is added. In fig. 2-4, it can be seen that the white precipitate has a loose structure after the water treatment agent is added, and is easily separated from the surface of the container, which indicates that the water treatment agent provided by the present application has good scale cleaning capability.

(4) The experiment on the coating effect of the water treatment agent provided in the embodiment 2 of the present application at different pH values. The results of the experiment are shown in table 3.

TABLE 3 results of coating experiments

The water treatment agent provided by the application is applied to heat supply network systems of multiple heating power companies, and has good effect and obvious benefit. The using units mainly comprise a Chinese electronic information industry group, a Shanxi Jinjian group, a Beijing energy group, a Beijing Hot group and the like.

For example, the Beijing thermal group uses 75 tons of the water treatment agent provided in example 2 per unit.

The water quality is qualified in the second day after the medicine is added, and the hardness is qualified and is 0.18mmol/L.

The coal saving amount before and after use is 6.94 ten thousand tons; the unit consumption of the fire coal is reduced by 20.52kg/m compared with the unit consumption of the fire coal in the last heating season²(ii) a The water consumption is reduced by 4.6 ten thousand tons compared with the last heating season; the water unit consumption is reduced by 5.72kg/m compared with the previous heating season²(ii) a The cost is saved by tens of millions.

For another example, 30 tons of the water treatment agent provided in example 2 was used by a certain unit of the electronic information industry group in china.

The water is muddy with silt before adding the medicine, the water quality is qualified the next day after adding the medicine, and the hardness is qualified to be 0.36mmol/L.

The coal saving amount before and after use is 8667 tons; the water consumption is reduced by 5.375 ten thousand tons compared with the last heating season; saving 10 tons of industrial salt; saving 615 ten thousand of cost.

In a word, the phosphorus-free nitrogen-free environment-friendly hot water boiler water treatment agent provided by the application is phosphorus-free nitrogen-free environment-friendly and pollution-free, so that eutrophication of water bodies and secondary pollution caused by discharge are avoided. The scale remover has strong penetrating capacity, can penetrate into the contact surface of scale and metal, and has double decomposition effect with calcium and magnesium salts, so that the adhesion force of old scale and the metal surface is reduced and the old scale falls off, the effect of removing the old scale is achieved, and meanwhile, the iron ions in a heat supply network system can be removed. The descaling effect is obvious (can reach 100 percent), and the corrosion inhibition efficiency is more than or equal to 98 percent. The boiler can be cleaned without pickling the boiler, so that the boiler can run cleanly and without scale, and the heat exchange efficiency of the boiler is improved. Can be plated with a layer of compact and extremely thin protective film, so that the metal surface and the medium water are thoroughly isolated, and the function of corrosion prevention is really achieved. The product is added when the boiler is subjected to alkaline cooking, the alkaline cooking control end point is reached in advance, and the cleaning is clean and good in effect. Can replace boiler alkali cooking agent, shorten boiler alkali cooking time, save fuel consumption, and achieve the effects of energy saving and consumption reduction. Has the function of removing organic matters such as microorganism, algae and the like in a pipe network system. The scale is removed, the scale is prevented, the hardness is reduced, the heat exchange efficiency of the boiler and the heat exchanger is improved, the heat exchanger is free from cleaning, the service life of the boiler and a pipe network is prolonged, and safe and energy-saving operation is achieved. The excellent protective agent for boiler and pipe network maintenance is used. Tap water can be directly used as heating water without softening and desalting, so that the heating cost can be greatly reduced, and good economic and social benefits are created for enterprises. The consumption is less, the cost is low, the energy is saved, the consumption is reduced, the fuel consumption is reduced, and the environmental pollution is reduced.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A phosphorus-free nitrogen-free green environment-friendly hot water boiler water treatment agent is characterized by comprising the following components in percentage by weight: 35-42% of sodium humate, 13-17% of disodium ethylene diamine tetraacetate, 13-18% of sodium polyaspartate, 13-18% of sodium hydroxide, 8-12% of sodium carbonate and 3-6% of auxiliary agent.

2. The phosphorus-and nitrogen-free green and environment-friendly hot water boiler water treatment agent according to claim 1, comprising the following components in percentage by weight: 37% of sodium humate, 16% of ethylene diamine tetraacetic acid, 17% of sodium polyaspartate, 16% of sodium hydroxide, 11% of sodium carbonate and 3% of an auxiliary agent.

3. The phosphorus-and nitrogen-free green and environment-friendly hot water boiler water treatment agent according to claim 1, comprising the following components in percentage by weight: 40% of sodium humate, 15% of disodium ethylene diamine tetraacetate, 15% of sodium polyaspartate, 15% of sodium hydroxide, 10% of sodium carbonate and 5% of an auxiliary agent.

4. The phosphorus-and nitrogen-free green and environment-friendly hot water boiler water treatment agent according to claim 1, comprising the following components in percentage by weight: 41% of sodium humate, 14% of disodium ethylene diamine tetraacetate, 14% of sodium polyaspartate, 16% of sodium hydroxide, 11% of sodium carbonate and 4% of an auxiliary agent.

5. The phosphorus-and nitrogen-free green and environment-friendly hot water boiler water treatment agent according to any one of claims 1 to 4, wherein the auxiliary agent comprises any one or a mixture of a dispersant, a bactericide and a pre-film protecting agent.

6. The phosphorus-and nitrogen-free green and environment-friendly hot water boiler water treatment agent as claimed in claim 5, wherein the water treatment agent is dissolved and then added into the water tank when in use, and the concentration of the water treatment agent in the water tank is controlled to be not more than 10%.

7. The phosphorus-and nitrogen-free green and environment-friendly hot water boiler water treatment agent according to claim 5, wherein the frequency of adding the water treatment agent is once per week, and the dosage of each time is determined according to the amount of water to be supplemented per week and the water quality to be supplemented.

8. The phosphorus-and nitrogen-free green and environment-friendly hot water boiler water treatment agent as claimed in claim 5, wherein the water treatment agent is used while controlling the pH of water to 10-10.5 when no copper equipment is present in the system; when copper equipment is arranged in the system, the pH value of the water is controlled to be 9.5-10.