CN1253914A - Method for preventing heating water of boiler from illegal using - Google Patents

Abstract

The present invention provides a method for preventing heating water of hot-water boiler from illegally discharging and using, and is characterized by adding chromogenic agents, such as carbon black, etc. and odour-producing agents, such as thiol, etc. in original corrosion and scale inhibitor to make the heating water become "reeky and squalor" so as to attain the goal of preventing heating water from illegally discharging and using, retaining water level for maintaining boiler and further raising heat efficiency of the boiler.

Description

Anti-theft method for boiler heating water

The invention provides a method for solving the contradiction between softened water needing corrosion and scale inhibition treatment in a hot water boiler water heating system and the water which is privately stolen by heating users.

The tap water taken by the boiler contains oxygen, chlorine and Ca²⁺、Mg²⁺、Fe³⁺Hard water with equal components is treated by softening treatment in front of or in the boiler to reduce electrochemical corrosion and CaCO of the boiler body₃、MgCO₃And the deposited hard scale is removed, thereby achieving the purpose of corrosion and scale inhibition. However, in the real society, particularly, there is no heating user who is dedicated to clean water facilities for bathing, and it is very common to steal hot heating water for clean heating users, steal hot heating water for clean bathing, and the like. The contradiction between stealing and softening boiler water troubles the department of the boiler for a long time, so that the conventional boiler maintenance measures of corrosion and scale inhibition cannot be normally carried out. Occasionally, the water tap stolen for water discharge is detected, but the water tap is not punished, and the water tap cannot be stopped and is in a state of no interest. A large amount of waste liquid and other pollutants are added into a boiler by part of department of drivers, although the 'soil method' can inhibit the behaviors of a part of users in a short period of time, some components are insoluble in water, some components are corrosive to the boiler, and the components are finally volatilized or adhered to certain dead corners to be not beneficial to heat exchange, have no maintenance effect on the boiler and are unscientific.

The Chinese patent abstract database does not search the precedent for solving the problem.

The invention aims to provide a method for solving the contradiction, which can realize corrosion and scale inhibition treatment of boiler heating water, and can effectively prevent a heating user from stealing water, thereby realizing virtuous cycle of boiler operation and maintenance.

In order to achieve the purpose, a technical scheme for solving the problems is adopted, namely, the corrosion and scale inhibitor is added into the original heating water, and meanwhile, components which enable the water body to show a dirty and smelly sensory effect are added. So that the water discharged by user is dirty and smelly sewage, rather than heating in boiler, and the Ca (HCO) in most of tap water is treated₃)₂、Mg(HCO₃)₂The soft water deposited out is decomposed, so that the theft can be stopped.

As with the corrosion and scale inhibitor, the added color developing agent, the added odor reducing agent and other components must meet the rated working conditions (the temperature is less than 150 ℃ and the pressure is less than 1.0MPa) of the common low-pressure hot water boiler, and the chemical properties of the components are relatively stable. On the premise of selecting the following substances:

1. color developing agent: in principle, all kinds of insoluble substances which are capable of satisfying the conditions, do not cause adverse reactions with other components, have dark colors, are soluble and emulsifiable, have specific gravity which is not too different from that of water, and can be stably dispersed in an aqueous phase in a particle form by a suspending agent can be used. However, the coloring agent with strong nucleophilicity to cellulose and protein components such as cotton, hemp and wool is selected, especially the direct dye, and the direct dye with the content of more than 50mg/l is used in a large amount, so that a user is difficult to soap wash after being dyed, and only the cost is high; selecting 2-3 times of surfactant and thickener, and suspending the carbon black after dispersion, especially phi 9-37 nm, gamma 1.8-2.1 g/CM³The pigment carbon black has obvious dark color effect when the content of the pigment carbon black is more than 2mg/l, the cost is low, and the pigment carbon black can disperse suspended carbon black particles in water and can adsorb newly generated CaCO₃、MgCO₃And the deposition and the scale inhibition function are simultaneously realized, but the stain resistance is poor and the stain is easy to rinse off.

2. Odor-reducing agent: the materials with moderate boiling point and solubility, low toxicity, absolute safety at use concentration, unpleasant smell and sensitivity, such as mercaptan, ammonia and the like, are selected. The most preferable is ethanethiol, which is characterized in that the content of ethanethiol in air is 10-11g/l, the offensive odor can be smelled, the toxicity is very low, the low boiling point of ethanethiol is 35 ℃, the nature of being slightly soluble in water (the solubility of ethanethiol is not too low in various literatures) is ensured, the consumption of ethanethiol is much less than that of other components, and the offensive odor emitted by ethanethiol can be obviously smelled even if the concentration of ethanethiol in water is 0.1 mg/l. It can be easily oxidized in the air, and the final product is the ethyl sulfonate which is non-toxic and odorless, thus being more beneficial to environmental protection. However, even in the closed environment of the boiler water heating system, the small amount of oxygen, chlorine and Fe in the water³⁺、Cu²⁺The oxidant can also quickly oxidize 0.1-1 mg/l of the used concentration, so the consumed amount of the oxidant needs to be supplemented in the water body. And because of its sensitive foul smell, the agent cannot look like itThe components are added into a water supply tank firstly, then added into a boiler by a water feeding pump, and directly added into a closed boiler water body. Otherwise, the effluvium and residual foul smell in the water tank can make the stew personnel unable to accept the practical application of the technology.

The ethanethiol is supplemented by adopting a 'slow release technology', namely, ethanethiol salt is put into a container with micropores in advance, the container is put into a boiler water body, or the micropore part of the container is connected with the water body, water can freely pass through the micropores to enter the container and generate a hydrolysis reaction (pKa is 10.5) with the ethanethiol, and the generated ethanethiol enters the water body through the micropores so as to ensure the concentration balance of the ethanethiol in the water.

3. Antioxidant: because the tap water contains oxygen, chlorine and Fe³⁺、Cu²⁺The oxidizing agents, which are corrosive to the water heating system and oxidizing to the medicament components, must be consumed by adding a certain amount of reducing agent. From the viewpoint of using ethanethiol as an odorant, it is preferable to use a complex composed of the following components. It is composed ofThe principle is shown in the following reaction formula: ※

according to the theoretical and practical comprehensive results, the content of ethanethiol in the water body is 0.5-1 mg/l, and Na₂S is 1-2 mg/l, Na₂SO₃The dosage is 20-40 mg/l, and the effect is best.

4. Corrosion and scale inhibitor: the components are used as water treatment agents and are not in the novel and creative scope of the patent application. The following types can be classified according to functions:

(1) a chelating agent: can remove Ca in water²⁺、Mg²⁺、Fe²⁺、Cu²⁺、Zn²⁺、Al³⁺The plasma is complexed into soluble salt, so that the soluble salt can not generate precipitate to achieve the aim of inhibiting scale and even removing scale. In the past, cheap polyphosphate is commonly used, and has short action time due to slow hydrolysis; the hydroxyl phosphonate, amino phosphonate, hydroxyl carboxylate, amino carboxylate, etc. which are developed at present are all stable and efficient complexing agents, but the cost is higher. The combination of the two has good effect and price ratio. In addition

(2) Dispersing agent: used for adsorbing insoluble particles in water and acts as a colloid stabilizer, thereby achieving the aim of not forming compact and firm scale even if sediment is generated. In principle, the chemical properties can be basically stable under the water body condition, and high molecular compounds or particles which are dissolved in water, emulsified in water, suspended and dispersed in water and the like can be used. Such as natural baking glue, resin, lignin salt, and artificially synthesized polyacrylate, polyacrylamide, etc., and has good potency. The carbon black, especially the pigment carbon black, can also have the double functions of the effect, and the soluble high molecular compound and the like can also have the suspending effect on the carbon black particles, so that the combination of the two can play the mutual promoting effect.

(3) A corrosion inhibitor; the dosage of the components is very small, generally dozens to hundreds of micrograms per liter, but the components can obviously play a role in inhibiting the metal corrosion. They are adsorbed on the metal surface of the exposed part to form a hydrophobic protective film, which can inhibit or block the electrochemical reaction on the metal surface. General organic compounds with strong polar groups have the function. But some groups have certain selectivity on the adsorption of some metals, such as R-COOH on steel; the amine and the heterocyclic compound containing S, N play an obvious corrosion inhibition synergistic effect on copper and copper alloy, such as common benzothiazole, benzotriazole and the like, and on equipment such as water pumps, valves and the like when the using amount is small.

The components of the color developing agent, theodor-reducing agent, the antioxidant and the corrosion and scale inhibitor are added into the circulating water of the common low-pressure hot water boiler, so that the user is afraid of stealing the heating water due to the characteristics of dirtiness and odor. Meanwhile, as no water is drained, the water level and the effective components of the maintenance boiler in the water are retained, and less fresh water, cold water and scale formation are achieved, so that the heat efficiency is improved, the coal is saved, and the labor intensity of a fireman is reduced. Thus, a virtuous cycle is formed, and the problems of more stolen and supplemented water, cold water, more corroded and scaled, more coal-consuming and more tired vicious cycles and unscientific and inefficient behaviors caused by the 'soil method' are fundamentally solved.

The following is further illustrated by several specific examples:

example 1: the result of a comparative experiment shows that the concentration of the direct black dye in water is more than 30mg/l, namely the direct black dye is obviously dark transparent color liquid. The white cloth strips, the wool and the thick paper are respectively soaked in 50mg/l solution at room temperature for 30 minutes and 100mg/l solution for 10 minutes, and then taken out, and are dyed in light gray, and the gray is not faded when washed by soap.

Example 2: 50mg of wax-sealed carbon black, 1ml of benzyl alcohol, 1ml of diethylene glycol and 8ml of ethanol are put into a mortar for grinding for about half an hour, 40ml of 0.5% polyvinyl alcohol solution is mixed uniformly to reach the total amount of 50ml, 2ml of the mixture is added into a dropping bottle of 500ml of water for mixing uniformly, and the gray ink color and the blackness are similar to those of 30mg/l direct black liquor in example 1. The carbon black content of this suspension was 4 mg/l.

Example 3: about 0.2ml of Changlong ink (provided by Changlong cultural goods factory in Changchun city and composed of pigment carbon black plus polyvinyl acetate, glycerol, mixed alcohol and the like) is taken and added into a dropping bottle of 500ml of water, and after the mixture is mixed, the black color of the gray ink is similar to that of example 2.

Example 4: the Changlong ink 20 is taken and dripped with water to 500ml, the degree of blackness imitating the direct black content of 100mg/l (actually darker than the direct black liquid of 100mg/l, and is opaque at the moment) is soaked for 30 minutes by the same white cloth, woolen yarn and thick paper, and no ink mark is left after the black is rinsed by clear water, which indicates that the carbon black has little or no dyeing activity.

Example 5: an automatic electrothermal pressure controller is reformed from 23L steel cylinder. Respectively taking 100ml of 1% direct black stock solution and 0.1mg/l of Na₂S, 1mg/l of Na₂S₂O₃20mg/l of Na₂SO₃30ml of the mixed solution is added into 20 liters of water in a steel cylinder,mixing, standing for 1 hr. Then 30ml of 0.033% ethanol solution of ethanethiol NaOH is added and mixed evenly. A full mouth dropper of about 560ml was then removed therefrom for comparison. Then, the steel cylinder is sealed, heated and pressurized, the pressure is raised to 0.40MPa, the pressure is controlled to be within the range of 0.35-0.40 MPa and maintained for 12 hours, the electricity is removed, the temperature and the pressure are reduced, finally, the 560ml bottle is opened, the bottle is filled with a sample, the two samples are compared with the 560ml sample remained, the chromaticity of the two samples is not obviously different, the latter sample has no strong odor of ethanethiol, and the latter sample has no smell, which indicatesthat the ethanethiol is completely oxidized into the ethanesulfonate, but is not slightly oxidized into the C₂H₅SS-C₂H₅Therefore, it still has strong foul smell and is less soluble in water.

Example 6: taking a plastic barrel with the volume of 2L, firstly adding 1L of tap water, and then respectively adding:

①, Na with concentration of 0.1mg/l₂S，1mg/lNa₂S₂O₃20mg/l of Na₂SO₃2.5ml of mixed solution;

②, 12.25ml of 1% direct black stock solution;

③, 20ml of 0.25% phytic acid liquid;

④, 0.7% EDTA (NH)₄)₄20ml of solution;

⑤, 10ml of 0.5 percent polyvinyl alcohol solution;

⑥, 15ml of 0.5% gelatin solution;

⑦, 10ml of 0.5 percent Arabian gum liquid;

⑧, and 5ml of 0.001% benzotriazole solution.

Then adding 1L of water, mixing uniformly, standing for 3 hours, taking 3ml of 0.033% (0.33mg/ml) ethanethiol NaOH ethanol solution, inserting a pipette into the bottom, blowing in, adding water until the bottle mouth is full, and screwing tightly by adding a cover. The content of the direct black in the liquid is 50mg/l, and the content of the ethanethiol is 0.5 mg/l. The liquid is placed and observed for more than 7 months at intervals, the strong odor is generated when the cover is opened every time, and the black color gradually becomes lighter along with the time, because the black brown precipitate at the bottom is heated and intensely lightened, the color is deepened, and the black color is absorbed by the gelatin, the Arabic gum, the polyvinyl alcohol and other polygels.

Example 7: the boiler experiment is a non-professional experiment of a small hot water boiler which is specially used for a residence and is additionally used for extracting workshop heating in a pharmaceutical factory; the confidentiality private experiment is only carried out under the condition that the boiler shift and a resident colleague assist two persons. Because the cooperation of a contractor, a steward, of the furnace operation cannot be obtained, for example, the sampling time is changed to 10 days from 5 days to one day of the original plan; the back mixing of the supplementary chemical in the water tank, especially the firer pours more than 40 kilograms of waste liquid medicine into the water tank from the laboratory on the next day after the stove is started, and the firer adds water into the water tank, i once touch the phenomenon of water overflow and escape, and the underground part of the pipeline of the furnace doubts water leakage for a long time, because the construction is not built into a ditch which can enter, the problem is not easy to be solved, and the circulation pump and other places leak. And in the later sampling and measurement, the actually measured iodine consumption value of the reducing agent is much smaller than the theoretical value calculated according to the dosage. However, the purpose of the experiment is the odor effect and the slow release effect of the ethanethiol in the water, and the iodine consumption value is only a reference value of the antioxidant level in the reaction water, so the iodine consumption value has no essential influence on the purpose of the experiment and the overall effect. It is confirmed that the experimental result is sufficient to support the feasibility of the anti-theft method.

The experimental equipment is an QXH-120-7/95 type hot water heating boiler, the rated water outlet temperature is 95 ℃, the actual water replenishing pressure is 0.3-0.4 MPa, 30 households are supplied with heat, and a small building of an extraction workshop is additionally arranged. The water-heating system calculates the water capacity to be 18 tons, and calculates the addition of each component by taking 20 tons as the total water capacity, which is as follows:

the preparation stage, the experiment divides the components into several groups according to the properties:

the component A comprises: separately taking Na₂S₂O₃·5H₂O500g、Na₂S·9H₂O100g, anhydrous Na₂SO₃1000g (for this reason, the chemical is added in the new tap water, which contains a large amount of oxygen, chlorine and Fe³⁺、Cu²⁺Iso-oxidizing property is stronger according to the reaction formula It can be known that Na is added into the water-supplementing tank which is the equipment in front of the furnace₂S₂O₃Can save Na₂SO₃Consumption and usage in the pan).

The component B comprises: taking 150ml of NaOH ethanol solution of ethanethiol, wherein 25g of ethanethiol is contained, adding saturated Na₂150ml of S liquid, about 250ml of concentrated ammonia water is added until the mouth is full, and the bottle cap is screwed down.

And the component C is as follows: this is part of the "sustained release technique", see fig. 1:

weighing 70g of KOH tablets, adding the KOH tablets into a 'Wahaha fruit milk' bottle (6) with the capacity of 100ml, then adding 70ml of ethanethiol in a cold water basin while cooling, and finally reacting to obtain the snow jelly-like ethanethiol potassium salt (5). Then a round-cut and radial-cut PVC plastic sheet (4) is rolled into the bottle and covered on the bottle, and a plastic-coated thick paper sheet (3) is cut and covered for preventing incomplete covering of the (4). Then 0.5% polyvinyl alcohol solution is mixed with 1: 1 fine sand and 425 # cement paste to fill the bottle mouth, thus obtaining the microporous slow-release bottle stopper (2). Then the bottle is wrapped and wound tightly by cotton cloth (9), and then an iron wire (1) with the diameter of 1.2mm is used for screwing around the bottle neck, and the rest iron wire is reserved so as to fix a certain part of the boiler for standby.

The cement mortar is used as the bottle mouth plug, the water permeability of the microporous structure of the cement mortar is considered, the polyvinyl alcohol is added, the polyvinyl alcohol can be slowly dissolved in water only when the temperature of the polyvinyl alcohol is higher than 70 ℃, so that the cement plug (2) can be enabled to permeate water only when the cement plug is added into boiler water and is in a running state when the boiler is started and the temperature is raised to be higher than 70 ℃, the generated ethanethiol enters a water body through micropores, and the purpose of slow release is achieved. The 'Wahaha fruit bottle' with phi of 40mm is used because the time is tight at that moment, glass or other containers which are better and more suitable for the inner diameter of the safety valve seat with phi of 50mm cannot be found in time and are used. The cotton cloth is wrapped by several layers of cotton cloth because of its water absorption, water resistance, heat insulation and stable physical and chemical properties in water, and can protect the bottle body and bottle plug. The bottle body can not be greatly deformed and broken even if softened in hot water. I have previously used a pressure cooker to hot-cook the bottle for half an hour and remain unchanged from the original shape.

(II) putting phase, see FIG. 2:

after preparation, the following operations were carried out with the help of the boiler shift theday before the start of the unit in japan in 11 months and 20 (19 days):

①, 500gNa is firstly mixed₂S₂O₃·5H₂Pouring O into water tank, filling water into water tank, adding Na₂S₂O₃The solution is pumped into a portion of the pan.

②, and then, Na is added from the opening of the valve seat (8) where the safety valve is detached₂SO₃1000g、Na₂S·9H₂O100g was poured into the pan. Then, the B component bottle is poured into the bottle, and the B component bottle is rinsed with a small amount of clear water and then poured into the bottle, so that the B liquid can flow into the Na on the lower part₂S₂O₃In solution.

③, slowly extending the C component slow release bottle (6) from the valve seat into the upper header of the boiler until it is stable, then coiling the iron wire (1) left on the upper part and clamping it in the clamping groove (7) of the valve opening for taking out later.

(III) sampling observation and measurement stage:

the following samples are taken from a phi 20 valve connected to a water return pipeline of the second floor.

Sampling in 11 months and 1 day, opening a water valve to discharge water, and taking 2 full bottles respectively by using 250ml dropping bottles, wherein the strong smelly egg-like odor is carried by the water which emits hot steam to blow the nose. After standing the solution, the following indexes were measured, respectively:

①, observing the appearance of the sample liquid;

② opening the bottle and smelling the smell during titration (note: C)₂H₅SSC₂H₅Insoluble in water, but still malodorous);

③, measuring the pH value by using a 5.5-9.0 precision pH value test paper;

④ collecting supernatant, adding 20ml into conical flask, adding 1% starch 4 drops, and adding into conical flask with 5 × 10 pieces^-4Titrating the mol/l iodine standard solution, wherein when the sample solution is colorless and just turns blue, the end point is the volume average V of the iodine solution consumed, and the volume average V is a reference index of the content of the reducing agent in the sample solution;

⑤, the tap water was boiled and used as a blank control.

For the sake of economy, the sampling is performed every 10 days on the day of 10 months and 20 days as the start of dosing, and the sampling test results for 1 month are summarized in the following table:

item Date	Sample liquid in bottle Appearance of the product	pH value	Smelling flavor	Consuming iodine V(ml)
					11 month and 1 day	Light yellow with brown bottom Sediment of dregs	6.0	Strong smell	1.01
11 month and 10 days	Light yellow and a little brown Sediment of dregs	6.0	Strong smell	0.82
					11 month and 20 days	Very pale yellow Less precipitation	6.5	Strong smell	0.72
11 month and 25 days Blank space	Colorless and colorless Bottom wall is seen to be settled	6.5	Without bad smell	0.25

Day 21, 11 months, the water leakage of the first floor household pipeline is found, wherein one section is as follows: "what and west you got inside you, that smell is nausea, … …", also illustrates the problem. Then, because the iron pipe is corroded by water leakage, the iron pipe needs to be replaced by a new pipe, and all water heating water is discharged by a fireman.

And after 11 months and 25 days, water is drained and sampled, the water is extremely yellow, still has slight odor but is obviously little, the PH is measured to be 6.5, and the iodine consumption V is measured to be 0.51 ml.

Example 8: this example was conceived well during example 7.

On day 11, 26, 20 bottles of jongqi ink (total 500ml × 20 ═ 10L) were added to the water tank.

Taking Na in the morning on 28 days 11 month₂S₂O₃·5H₂O500g，Na₂S·9H₂O100g，Na₂SO₃1000g is added into a water tank. And sampling from the water tank and sampling at the original sampling valve, wherein the former has a color which is obviously darker than that of the latter ink, and the latter has a color which is similar to that of 6 drops of ink dripped into 500ml of water.

In the same day and night, a valve (20) connected to a horizontal pipeline tee is provided with a heat release-slow release bottle for ethanethiol. The connection and structure are as follows:

(I) preparation of "Heat Release-Slow Release bottle" of ethanethiol, seeFIG. 3:

①, firstly, wrapping one end of a short wire (12) with phi of 20mm with paper (10), baking for a while on an electric stove to enable the temperature to reach about 80 ℃, putting the melted commercial paraffin (the melting point is 55-66 ℃, the paraffin is put into water through experiments, heating the water to raise the temperature, the surface of the paraffin is melted when the water temperature is about 58 ℃ and the paraffin floats on the water surface like oil beads), pouring the paraffin into the short wire (12) from the other end port to enable the paraffin to form a paraffin liquid column with the thickness of about 1cm on the paper, slowly cooling the paraffin liquid column to form a paraffin plug (11), and then sealing and screwing the reducing pipe hoop (14) with phi of 40 multiplied by 20 and the non-wax end of the short wire (12), thus forming a heat release chamber (13).

②, cutting elm rod with longitudinal micropores into a cylinder with inner diameter suitable for phi 40 short filament (16), and crossing into "micropore partition (15)" with thickness of 1cm, slowly pushing it into the short filament for about 1cm, and sealing and screwing the other end of the elm rod with another phi 40 × 20 pipe hoop (18), thus forming "slow release chamber (17)".

③, placing 50g of snow-like potassium ethanethiol prepared from 100g KOH and 100ml ethanethiol in a heat release chamber (13), placing the rest 130g in a slow release chamber (17), and adding 30g Na₂S·9H₂After the O is filled, the dead plug (19) is tightly screwed with the pipe hoop (18).

④, finally, the pipe hoop (14) of the heat release chamber (13) and the short wire (16) of the slow release chamber (17) are butted, sealed and screwed into a whole, thus finishing the manufacture of the heat release-slow release bottle.

The working principle of the heat release-slow release bottle is as follows: when the water temperature of the water heating system exceeds 60 ℃, the paraffin plug (11) starts to melt quickly, so that the water enters the heat release chamber (13) and is immediately contacted with potassium ethanethiol to generate hydrolysis reaction, and the generated ethanethiol enters the water heating system. After the potassium ethanethiol in the heat release chamber (13) is hydrolyzed quickly, water can further slowly enter the slow release chamber (17) through micropores in the micropore partition (15) to react, and the generated ethanethiol enters the heating water through the micropore partition (15). Thus completing the process of 'heat release-slow release' ethanethiol. The method of using the heat release-slow release bottle has the advantage that the bottle can be conveniently replaced to continue to be supplemented according to the odor condition of the ethanethiol content in water at any time in the running process of the boiler.

(ii) installation experiment stage, see fig. 4:

when a valve (20) with the diameter of 20mm connected from an original horizontal pipeline is in a closed state, wax paper (10) on the opening of a heat release-slow release bottle is torn off, a short wire (12) is butted with the valve (20), the valve (20) is tightly screwed in a sealing way, and then the valve (20) is fully opened to enable hot water to be in contact with a paraffin plug (11).

Although the sealing glue and the silk fastener tape are smeared on the silk fastener before each pipe fitting is connected, the bottle body still has odor so as to make the family members of the friend less harmed (because the mild air oxidation ethanethiol, the generated C₂H₂SSC₂H₅Still foul smell), i used 5% KMnO₄The whole bottle body is cleaned by the liquid, and the whole bottle body is completely covered to the tee joint by the plastic bag. And then soak KMmO₄The wet cloth is wrapped with a layer, and the wet cloth is wrapped with a plastic bag.

The samples taken at 11 months and 30 days were as before strong smells, grey ink, and their chroma was not significantly different from that of the samples taken at 28 days.

The sample is taken at 12 months and 5 days, still has strong odor, and the gray ink chroma is slightly lower than that of the sample at 28 days, and is similar to that of 5 drops of ink.

The sample is taken at 12 months and 10 days, still has strong odor, and the gray ink chroma is similar to the 4-drop ink chroma.

The sample is taken after 12 months and 20 days, still has strong odor, and the gray ink color is similar to the color of 3 drops of ink.

The sample is taken at 12 months and 30 days, still has strong odor, and the gray ink color is slightly lower than the 2 drops of ink color, so that the color is dark and light.

(III) analysis summary stage:

the odor of the sample is measured in 35 days, and the observation result shows that the strong odor and the black gray ink have the odor and dirty feeling, which can prevent the user from stealing the heating water.

Description of the drawings:

FIG. 1: 1/4 section view of "slow release bottle" component C of example 7;

FIG. 2: is a schematic view of the "sustained release bottle" of example 7 placed in a pan;

FIG. 3: is an axial sectional view of the "heat release-sustained release bottle" ofexample 8;

FIG. 4: is a connection diagram between the heat release-slow release bottle and the pipeline of the example 8;

the main references with the corresponding "numbers in the foregoing: low-pressure boiler water treatment process and operation, Wanfeng Song Chunzhen compilation (Chinese chemical industry Commodity university) editorial committee Shu Ming Master compilation (university organic chemistry) [ Deg]PAVL KARRER, He Jun super compilation (chemical dictionary) compiled by Fuyindong compilation (Water supply and drainage common data Manual) Wanhaishan mountain Intelligent modification and Deg Master compilation (Fine chemical engineering application formula 3000 cases) compiled by Huangxi super xu Tan Qian Master compilation (Fine chemical dictionary) (Ri) compiled committee Yumao chapter, and other translation and correction works

Claims (3)

1. A method for preventing the heating water of boiler from being stolen is characterized in that a corrosion and scale inhibitor is added into the heating water of a hot water boiler, and meanwhile, components capable of enabling the water body to show a dirty and smelly sensory effect are added, and the method is characterized in that:

A. a color-developing agent, preferably a pigment carbon black;

B. an odorant, with ethanethiol being preferred.

2. According to claimThe method of claim 1, wherein the method comprises using ethanethiol as an odorant and simultaneously protecting with an antioxidant, wherein Na is used as Na₂S and Na₂SO₃The composite of the composition is preferred.

3. The methodof claim 1, wherein the ethanethiol is supplemented by a "slow release technique" comprising loading ethanethiol into a container having external pores, placing the container in the water body of the boiler, or connecting the pores of the container to the water body.

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