Condensate water neutralizing agent, preparation method and application thereof and condensation type gas water heater

Abstract

The invention discloses a condensate water neutralizing agent, a preparation method and application thereof and a condensation type gas water heater, and belongs to the field of water treatment. The preparation method comprises the following steps: mixing a magnesium-containing compound, a fluxing agent and water to form wet powder; granulating the wet powder to form a granular material; and drying, melting and calcining, cooling and crushing the granular material to obtain the granular condensate water neutralizing agent. The condensate water neutralizing agent obtained by the preparation method is a coarse crystal body with moderate activity, takes magnesium oxide as a main neutralizing component, is hard in texture, good in weather resistance and good in selective reactivity, is insoluble in water and only reacts with acidic substances in condensate water, and magnesium sulfate generated by the neutralization reaction is good in water solubility, so that the neutralization effect is good. The slow-release coating is not easy to coat on the surface to prevent the subsequent neutralization reaction, can achieve the purpose of long-acting slow release, is applied to a condensation type gas water heater, can meet the requirement of no replacement in the use period of more than 10 years by adding a small amount, and brings great convenience to users.

Description

Technical Field

[0001] The invention relates to the field of water treatment, and in particular to a condensed water neutralizer, a preparation method and application thereof, and a condensing gas water heater. Background Art

[0002] Condensing gas water heaters will inevitably produce condensed water. The pH value of condensed water is usually between 2.5-3.5, which is highly acidic. Direct discharge will corrode walls, floors, floor drains, sewer pipes and other house facilities. Therefore, special materials are needed to neutralize the condensed water to reduce its corrosiveness.

[0003] In the related art, calcium carbonate is often used as a neutralizer for condensed water of condensing gas water heaters. Calcium carbonate is widely available and low in price, but it is easy to react with sulfate ions in condensed water to generate calcium sulfate that is not easily soluble in water. Calcium sulfate will coat the surface of the neutralizer, resulting in neutralization failure, so the neutralizer needs to be replaced frequently, which brings a lot of inconvenience to users. In contrast, magnesium carbonate or magnesium oxide both have good neutralization ability, and the magnesium sulfate generated after neutralization has good water solubility and will not coat the surface of the material to cause neutralization failure. However, the currently commercially available magnesium carbonate and magnesium oxide are both in powder form, have high reaction activity, do not have sustained-release properties, and cannot be used directly. Summary of the invention

[0004] In order to overcome the defects of the prior art mentioned above, the present invention provides a condensed water neutralizer and a preparation method and application thereof, and a condensing gas water heater.

[0005] To achieve the above object, the present invention provides a method for preparing a condensed water neutralizer, comprising the following steps:

[0006] mixing a magnesium-containing compound with a flux and water to form a wet powder;

[0007] Granulating the wet powder to form granules;

[0008] The granular material is dried, melt-calcined, cooled, and crushed to obtain a granular condensed water neutralizer.

[0009] In some embodiments of the present application, the magnesium-containing compound includes at least one of magnesium carbonate, magnesium hydroxide, magnesium sulfate, magnesium nitrate, and magnesium chloride.

[0010] In some embodiments of the present application, the magnesium-containing compound is magnesium carbonate.

[0011] In some embodiments of the present application, during the melt calcination process, the reaction process of the magnesium-containing compound magnesium carbonate is as follows:

[0012] MgCO3→MgO+CO2↑.

[0013] In some embodiments of the present application, the flux includes at least one of boron oxide, calcium oxide, and phosphorus oxide.

[0014] In some embodiments of the present application, the step of forming the wet powder includes the following steps: after mixing the magnesium-containing compound and the flux, spraying with water to form the wet powder.

[0015] In some embodiments of the present application, the drying temperature is 120° C.-180° C.; and / or the drying time is 2 h-4 h.

[0016] In some embodiments of the present application, the particle size of the granules ranges from 1 mm to 5 mm.

[0017] In some embodiments of the present application, the granular objects are spherical.

[0018] In some embodiments of the present application, the temperature of the melt calcination is 1200° C.-1800° C.; and / or the time of the melt calcination is 2 h-4 h.

[0019] In some embodiments of the present application, based on 100% of the total mass of the magnesium-containing compound, the amount of the flux added is 0.1%-1%;

[0020] And / or, based on 100% of the total mass of the magnesium-containing compound, the amount of water added is 10%-20%.

[0021] To achieve the above object, the present invention also provides a condensed water neutralizer prepared by the preparation method of the present invention as described above.

[0022] In some embodiments of the present application, the content of magnesium oxide in the condensed water neutralizer is above 95%.

[0023] In some embodiments of the present application, the particle size of the condensed water neutralizer ranges from 1 mm to 5 mm.

[0024] In order to achieve the above object, the present invention also provides a use of the condensed water neutralizer as described above in a gas water heater.

[0025] In some embodiments of the present application, 100g-150g of the condensed water neutralizer can meet the neutralization demand of the condensed water of the condensing gas water heater with a capacity below 18L during a service life of more than 10 years.

[0026] To achieve the above object, the present invention further provides a condensing gas water heater, which comprises the condensed water neutralizer as described above.

[0027] The beneficial effects that can be achieved by the present invention are:

[0028] The condensate neutralizer prepared by the present invention uses a magnesium-containing compound as a main raw material through mixing, granulation, drying, melt calcination, cooling, crushing and other processes is a coarse-crystalline body with moderate activity and large particle size, uses magnesium oxide as a main neutralizing component, and has a hard texture, good weather resistance, good selective reactivity, is insoluble in water, and only reacts with acidic substances in the condensate. The magnesium sulfate generated by the neutralization reaction has good water solubility and is not easy to be coated on the surface of the condensate neutralizer to prevent the subsequent neutralization reaction from proceeding. The purpose of long-term sustained release can be achieved. When used in a condensing gas water heater, only a small amount of addition is needed to meet the requirement of no replacement within a service life of more than 10 years, which brings great convenience to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 The present invention is a schematic diagram of the preparation process of a condensed water neutralizer.

[0031] Figure 2 It is a structural explosion diagram of an embodiment of the filter element device of the present invention;

[0032] Figure 3 A cross-sectional view of an embodiment of a filter element device of the present invention;

[0033] Figure 4 It is a schematic diagram of the cooperation between the cover body and the first filter screen cover in one embodiment of the filter element device of the present invention;

[0034] Figure 5 It is a schematic diagram of the assembled cylinder and filter body in one embodiment of the filter element device of the present invention.

[0035] Description of Figure Numbers

[0036]

[0037]

[0038] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] The present invention provides a condensed water neutralizing agent and a preparation method thereof, referring to Figure 1 The preparation method of the condensed water neutralizer comprises the following steps:

[0043] Step S10, mixing the magnesium-containing compound, flux and water to form a wet powder;

[0044] Step S20, granulating the wet powder to form granules;

[0045] Step S30, drying, melt-calcining, cooling, and crushing the granular material to obtain a granular condensed water neutralizer.

[0046] The present invention uses a magnesium-containing compound as the main raw material, and the condensed water neutralizer prepared by mixing, granulating, drying, melt calcining, cooling, crushing and other processes uses magnesium oxide as the main neutralizing component. In the prior art, the surface of the neutralizer with calcium carbonate as the main component is easily coated with calcium sulfate that is insoluble in water by neutralization reaction, and the neutralization function cannot be exerted for a long time, and the frequency of replacing the neutralizer is high. In contrast, the condensed water neutralizer of the present invention and the condensed water are neutralized to generate magnesium sulfate, which has good water solubility and will not be coated on the surface of the neutralizer to cause subsequent neutralization failure, which can meet the requirement of long-term use without replacement.

[0047] Moreover, the magnesium-containing compound of the present invention is calcined in a molten state, and a block product can be obtained after calcination is completed and cooled. The crushing process is conducive to obtaining a coarse-crystalline condensate neutralizer with hard texture, good weather resistance and moderate activity. It has a sustained release characteristic and good selective reactivity, is insoluble in water, and only reacts with acidic substances in water. Compared with the neutralizer with powdered magnesium carbonate and magnesium oxide as the main components in the prior art, it can achieve the purpose of long-term sustained release. When used in condensing gas water heaters, a small amount of addition can meet the requirement of free replacement within a service life of more than 10 years, which brings great convenience to users.

[0048] In some embodiments, the magnesium-containing compound includes at least one of magnesium carbonate, magnesium hydroxide, magnesium sulfate, magnesium nitrate, and magnesium chloride. With the above-mentioned magnesium-containing compound as the main raw material, a condensed water neutralizer with magnesium oxide as the main component can be formed in the subsequent melt calcination process. After the neutralization reaction of magnesium oxide and condensed water, magnesium sulfate that is easily soluble in water is generated, which is not easy to be coated on the surface of the condensed water neutralizer, resulting in subsequent neutralization failure.

[0049] In some embodiments, the magnesium-containing compound is magnesium carbonate, which has the advantages of good safety performance, low cost and easy availability, and can obtain magnesium oxide with high yield and purity, which is beneficial to increase the content of magnesium oxide in the condensed water neutralizer and enhance the neutralization effect. In the subsequent melt calcination process, the reaction equation with magnesium carbonate as the raw material is as follows:

[0050] MgCO3→MgO+CO2↑.

[0051] The temperature for calcining the magnesium-containing compound to reach a molten state is relatively high, so the present invention mixes the flux with the magnesium-containing compound before calcining. The flux can effectively reduce the melting temperature of the magnesium-containing compound, reduce the temperature of calcining and decomposing it to generate magnesium oxide, and reduce energy consumption.

[0052] In some embodiments, the flux includes at least one of boron oxide, calcium oxide, and phosphorus oxide. The above flux can help the magnesium-containing compound quickly enter a molten state at a relatively low temperature, decompose to generate magnesium oxide under relatively low temperature calcination conditions, and produce fewer by-products, which is not easy to affect the purity of magnesium oxide in the condensed water neutralizer.

[0053] The present invention does not limit the specific method of mixing the magnesium-containing compound with the flux and water to form a wet powder. In some embodiments, the magnesium-containing compound and the flux may be mixed to obtain a dry powder. For example, the dry powder may be put into a stirring kettle and stirred evenly to obtain a dry powder, and then water may be sprayed on the dry powder to moisten it to form a wet powder. The above method can obtain a wet powder with uniform humidity, which is more conducive to obtaining granules with better compactness in the later granulation process, and prevents the finally obtained condensed water neutralizer from being too loose and having strong reaction activity, making it difficult to achieve a sustained release effect.

[0054] In some embodiments, the amount of flux added is 0.1%-1% based on the total mass of the magnesium-containing compound of 100%; and / or, the amount of water added is 10%-20%. For example, the amount of flux added is 0.1%, 0.3%, 0.5%, 0.8%, 0.9%, 1%, etc., any value in the range of 0.1%-1% based on the total mass of the magnesium-containing compound of 100%; and / or, the amount of water added is 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, etc., any value in the range of 10%-20%. Under the above addition amount conditions, it is not only conducive to obtaining wet powder with appropriate humidity, so that granules with better compactness can be obtained in the later granulation process, and can be heated more evenly during the melting and calcining process, but also can help the magnesium-containing compound quickly enter the molten state and decompose to generate magnesium oxide under relatively low temperature calcining conditions.

[0055] In the present invention, before the raw materials are melt-calcined, a granulation operation in step S20 is also performed. The granules obtained after granulation are transformed from a loose state to a compact state, which can prevent the material from being powdered due to being too loose during the subsequent melt-calcination process. The powdered neutralizer is too active, reacts too quickly during the condensed water neutralization process, and has a poor sustained release effect, making it difficult to meet the requirement of free replacement of the condensing gas water heater within a service life of more than 10 years. Moreover, the granules are heated more evenly during the subsequent melt-calcination process, which can promote the decomposition of the magnesium-containing compound, and obtain a condensed water neutralizer with high magnesium oxide yield and good purity.

[0056] In some embodiments, the granules are spherical, and the wet powder is placed in a spherical machine and mixed to form the granules. The spherical granules have good density, are not easy to crush, are easier to transfer, and are heated more evenly, which is conducive to promoting the calcination and decomposition of the magnesium-containing compound, and quickly obtaining the condensed water neutralizer with magnesium oxide as the main component.

[0057] In some embodiments, the particle size of the granules is in the range of 1 mm to 5 mm, for example, it can be any particle size value in the range of 1 mm to 5 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc. The granules with the above particle size range are heated more evenly and can quickly reach a molten state.

[0058] The present invention granulates the wet powder and then dries it, which is also beneficial to promote subsequent melt calcination. In some embodiments, the drying temperature is 120°C-180°C; and / or the drying time is 2h-4h. For example, the drying temperature is any temperature in the range of 120°C-180°C, such as 120°C, 125°C, 130°C, 135°C, 140°C, 150°C, 160°C, 170°C, 175°C, 180°C, etc.

[0059] The present invention does not limit the method of drying the granules. In some embodiments, the granules can be spread out and transported to a preheated drying machine through a conveyor belt for drying. The above method can promote rapid drying of the granules.

[0060] In some embodiments, the temperature of melt calcination is 1200°C-1800°C; and / or, the time of melt calcination is 2h-4h. For example, the temperature of melt calcination can be any temperature value in the range of 1200°C-1800°C, such as 1200°C, 1250°C, 1300°C, 1350°C, 1400°C, 1450°C, 1500°C, 1550°C, 1600°C, 1650°C, 1700°C, 1750°C, 1800°C; and / or, the time of melt calcination can be any time value in the range of 2h-4h, such as 2h, 2.2h, 2.5h, 2.6h, 2.8h, 2.9h, 3h, 3.2h, 3.5h, 3.6h, 3.7h, 3.9h, 4h.

[0061] When the magnesium-containing compound is melt-calcined, the magnesium-containing compound will gradually decompose and release water, carbon dioxide, or sulfur dioxide, etc., and melt to form small-particle magnesium oxide crystals. The escaping gas will make the magnesium oxide crystals porous and have high reaction activity. Under the conditions of the above melt calcination of the present invention, as the melt calcination time is extended, the small-particle magnesium oxide crystals are mutually polymerized into dense large crystals under the action of molecular cohesion in the molten state, and the pores are gradually closed, and the reaction activity is also reduced. Therefore, the activity of the condensed water neutralizer can be controlled by controlling the melt calcination temperature and the calcination time, so that it can achieve a slow-release effect, and a small amount of addition can meet the requirement of free replacement during the service life of the condensing gas water heater for more than 10 years, which brings great convenience to users.

[0062] It can be understood that the above restrictions on the melt calcination temperature and the melt calcination time can meet one of them, or all of them. If all of them are met, it is easier to control the activity of the neutralizer in the condensed water and achieve a sustained release effect.

[0063] In some embodiments, the melt calcination operation can be carried out in a calcination furnace, the dried granules are put into a crucible, and then put into the calcination furnace, heated to a molten state for calcination. After the calcination operation is completed, the crucible is taken out and cooled naturally.

[0064] During the melt calcination process, the raw materials are in a molten mixed state, and after cooling, the raw materials are in a block state, so they need to be crushed. In some embodiments, after the cooling operation is completed, a crusher can be used to crush the raw materials, and then the condensed water neutralizer with the required particle size can be screened.

[0065] In some embodiments, the particle size of the condensed water neutralizer ranges from 1 mm to 5 mm. For example, it can be any particle size within the range of 1 mm to 5 mm, such as 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. Because the particle size of the condensed water droplets is very small, usually in the millimeter range, the condensed water neutralizer and the condensed water below 5 mm have similar particle sizes, which can increase the contact area between the condensed water neutralizer and the condensed water, and accelerate the neutralization reaction.

[0066] In some embodiments, the content of magnesium oxide in the condensed water neutralizer of the present invention is above 95%, for example, it can be 95%, 96%, 97%, 98%, 99%, etc.

[0067] The condensate neutralizer of the present invention has stable chemical properties, good weather resistance, does not crack when immersed in water for a long time, has good sustained-release performance, and only 100g-150g is needed to meet the neutralization demand of condensate water of a condensing gas water heater with a capacity of less than 18L during a service life of more than 10 years. The neutralization performance is far superior to commercially available neutralizers and has a high market application prospect.

[0068] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the following specific embodiments are only used to explain the present invention, and are not used to limit the present invention.

[0069] Example 1

[0070] This embodiment provides a method for preparing a condensed water neutralizer, comprising the following steps:

[0071] S10. Weigh 100 parts of magnesium carbonate and 0.15 parts of boron oxide by mass, put them into a stirring kettle and mix them thoroughly, then spray 15 parts of water under stirring to moisten them to obtain a wet powder.

[0072] S20, putting the wet powder into a ball forming machine, mixing it into spherical particles with a particle size of 1mm-5mm, so that the wet powder is transformed from a loose state to a compact state.

[0073] S30, spreading the granules and conveying them to a dryer heated to 140°C via a conveyor belt, keeping them for 2 hours to dry, putting the dried granules into a crucible, transferring them to a calcining furnace, heating them to 1500°C, keeping them warm for 4 hours, then turning off the heating, taking them out and letting them cool naturally, then putting them into a crusher to crush them, sieving out particles with a particle size of 1mm-5mm, and obtaining a granular condensed water neutralizer.

[0074] Example 2

[0075] This embodiment provides a method for preparing a condensed water neutralizer, comprising the following steps:

[0076] S10. Weigh 100 parts of magnesium carbonate and 0.1 parts of calcium oxide by mass, put them into a stirring tank and mix them thoroughly, then spray 10 parts of water under stirring to moisten them to obtain a wet powder.

[0077] S20, putting the wet powder into a ball forming machine, mixing it into 1-5 mm spherical particles, so that the wet powder changes from a loose state to a compact state.

[0078] S30, spreading the granular material and conveying it to a dryer heated to 160°C via a conveyor belt, keeping it for 3 hours to dry, putting the dried spherical material into a crucible, putting it into a calcining furnace, heating it to 1600°C, keeping it warm for 3.5 hours, then turning off the heating, taking it out and letting it cool naturally, then putting it into a crusher to crush it, sieving out particles with a particle size of 1mm-5mm, and obtaining a granular condensed water neutralizer.

[0079] Example 3

[0080] This embodiment provides a method for preparing a condensed water neutralizer, comprising the following steps:

[0081] S10. Weigh 100 parts of magnesium sulfate and 0.5 parts of boric oxide by mass, put them into a stirring kettle and mix them thoroughly, then spray 20 parts of water under stirring to moisten them to obtain a wet powder.

[0082] S20, putting the wet powder into a ball forming machine, mixing it into 1-5 mm spherical particles, so that the wet powder changes from a loose state to a compact state.

[0083] S30, spreading the granular material and conveying it to a dryer heated to 180°C via a conveyor belt, keeping it for 2 hours to dry, putting the dried spherical material into a crucible, putting it into a calcining furnace, heating it to 1800°C, keeping it warm for 2 hours, then turning off the heating, taking it out and letting it cool naturally, then putting it into a crusher to crush it, sieving out particles with a particle size of 1mm-5mm, and obtaining a granular condensed water neutralizer.

[0084] Example 4

[0085] This embodiment provides a method for preparing a condensed water neutralizer, comprising the following steps:

[0086] S10. Weigh 100 parts of magnesium carbonate and 1 part of phosphorus oxide by mass, put them into a stirring tank and mix them thoroughly, then spray 20 parts of water under stirring to moisten them to obtain a wet powder.

[0087] S20, putting the wet powder into a ball forming machine, mixing it into 1-5 mm spherical particles, so that the wet powder changes from a loose state to a compact state.

[0088] S30, spreading the granular material and conveying it to a dryer heated to 120°C via a conveyor belt, keeping it for 4 hours to dry, putting the dried spherical material into a crucible, putting it into a calcining furnace, heating it to 1200°C, keeping it warm for 4 hours, then turning off the heating, taking it out and letting it cool naturally, then putting it into a crusher to crush it, sieving out particles with a particle size of 1mm-5mm, and obtaining a granular condensed water neutralizer.

[0089] Example 5

[0090] This embodiment provides a method for preparing a condensed water neutralizer, comprising the following steps:

[0091] S10. Weigh 100 parts of magnesium hydroxide and 0.8 parts of boron oxide by mass, put them into a stirring kettle and mix them thoroughly, then spray 15 parts of water under stirring to moisten them to obtain a wet powder.

[0092] S20, putting the wet powder into a ball forming machine, mixing it into 1-5 mm spherical particles, so that the wet powder changes from a loose state to a compact state.

[0093] S30, spreading the granular material and conveying it to a drying machine heated to 150°C via a conveyor belt, keeping it for 3 hours to dry, putting the dried spherical material into a crucible, putting it into a calcining furnace, heating it to 1400°C, keeping it warm for 2.5 hours, then turning off the heating, taking it out and letting it cool naturally, then putting it into a crusher to crush it, sieving out particles with a particle size of 1mm-5mm, and obtaining a granular condensed water neutralizer.

[0094] Comparative Example 1

[0095] Condensate neutralizers with calcium carbonate as the main component are available on the market.

[0096] Comparative Example 2

[0097] Condensate neutralizers with powdered magnesium oxide as the main component are available on the market.

[0098] Comparative Example 3

[0099] Comparative Example 3 refers to the preparation method of Example 1, but the difference is that Comparative Example 3 is not calcined in a molten state. After the calcination operation is completed, since the obtained product particle size is very small, no subsequent crushing and screening operations are performed.

[0100] Performance Testing

[0101] 125g of the condensed water neutralizer obtained in this embodiment and the condensed water neutralizer of the comparative example were taken respectively, and a pH=3.0 aqueous solution was prepared with a mixed acid of nitric acid: sulfuric acid=5:1 (V / V), and the condensed water neutralizer obtained in this embodiment and the condensed water neutralizer of the comparative example were continuously passed at a flow rate of 20ml / min, and the pH value of the flow liquid was recorded once every 500L of water was passed. The test data is shown in Table 1.

[0102] Table 1 Comparison of the neutralization effects of the neutralizers in the condensed water of the embodiments and the comparative examples

[0103]

[0104] It can be seen from Table 1 that after the aqueous solution with pH = 3.0 is neutralized by the condensate neutralizer of the embodiment of the present invention, the pH value increases significantly, and the overflow liquid no longer has a strong acidity, which can solve the technical problem of direct discharge of condensate water corroding walls, floors, floor drains, sewer pipes and other housing facilities.

[0105] Moreover, after the condensate neutralizer of the present invention is neutralized with 3000L of aqueous solution, the pH of the aqueous solution can be significantly increased, reducing its corrosiveness. After conversion, the amount of water neutralized by 3000L is equivalent to the total amount of condensate generated by an ordinary household 16-liter condensing gas water heater during its 10-year service life, that is, 125 grams of the neutralizer can achieve the design service life of the gas water heater without replacement. It can be seen that the condensate neutralizer of the present invention has good sustained-release characteristics, can meet the requirement of long-term use without replacement, and has strong commercial value.

[0106] Comparative Example 1 uses a neutralizer with calcium carbonate as the main component for neutralization, which easily reacts with sulfate ions in condensed water to generate calcium sulfate that is not easily soluble in water. The calcium sulfate is coated on the surface of the calcium carbonate neutralizer, resulting in subsequent neutralization failure. When the water flow rate is 1000L, it is difficult to reduce the acidity of the aqueous solution. The pH of the overflow liquid is 3.57, which is highly corrosive. It can be seen that the condensed water neutralizer with calcium carbonate as the main component needs to be replaced frequently to improve the problem of direct discharge of condensed water corroding walls, floors, floor drains, sewer pipes and other housing facilities, and it is difficult to meet the requirement of free replacement within the 10-year service life of the condensing gas water heater.

[0107] Comparative Example 2 uses a condensate neutralizer with powdered magnesium oxide as the main component. It has a good neutralization effect before the water flow rate reaches 500L. However, the neutralization reaction activity of the neutralizer and the aqueous solution is relatively high and it does not have a sustained-release characteristic. When the water flow rate is 1000L, the neutralization effect is significantly reduced, and it is difficult to meet the requirement of long-term use without replacement.

[0108] Comparative Example 3 was not calcined in a molten state, and relatively loose particles were formed after drying and cooling. The reaction activity was strong, and it had a good neutralization effect before the water flow rate was 500L. However, when the water flow rate was 1000L, the neutralization effect was significantly reduced. It did not have a sustained-release property and it was difficult to meet the requirement of long-term use without replacement.

[0109] The present invention also provides a condensing gas water heater, which includes the condensed water neutralizer of the present invention as described above. The generated condensed water is neutralized by the condensed water neutralizer to avoid corrosion of house facilities such as walls, floors, floor drains, and sewer pipes. Moreover, only a small amount of addition is required to meet the requirement of no replacement within a service life of more than 10 years, which brings great convenience to users.

[0110] Gas water heaters, also known as gas water heaters, are gas appliances that use gas as fuel and transfer heat to cold water flowing through a heat exchanger through combustion heating to prepare hot water. Gas water heaters are mainly composed of valve body assemblies, main burners, low-fire burners, heat exchangers, safety devices, etc. They also include flues for flue-type water heaters and forced exhaust devices for forced exhaust water heaters. The valve body assembly controls the working procedures of the entire water heater, and it includes water valves, gas valves, micro switches, igniters, etc. When installing a water heater, valves should be installed on the water inlet pipe, outlet pipe, and gas pipe.

[0111] After a heat exchange, ordinary gas water heaters usually produce medium-temperature flue gas with a temperature of about 180°C. XThe flue gas has a high content and has water vapor with high heat energy content. If it is discharged directly, it will not only pollute the environment, but also cause a large amount of heat energy loss. In order to avoid environmental pollution and waste of heat energy caused by direct flue gas discharge, condensing gas water heaters came into being. Condensing gas water heaters use condensing heat exchange devices for secondary heat exchange to preheat the water, recover the latent heat of the medium-temperature flue gas, improve the utilization rate of the gas, and greatly reduce the temperature of the flue gas discharged from the machine. Because the water vapor in the medium-temperature flue gas will condense into liquid condensed water while releasing latent heat, and the CO2 and NO in the flue gas X Acidic gases such as condensate will dissolve in condensate, making it corrosive. Therefore, condensing gas water heaters usually need to be equipped with a condensate drain pipe to discharge the acidic condensate outside the machine, and a neutralizer must be used to remove the corrosiveness of the condensate before discharge. For the treatment of condensate, the user can place a water container for temporary storage and pour it out regularly; or set a drain pipe to connect to the user's home sewer. It can be seen that the existence of the condensate drain pipe and the discharge of condensate bring many inconveniences to users and are not beautiful; direct discharge of condensate will also cause waste of water resources.

[0112] The gas water heater proposed in the present invention is a condensing gas water heater. The gas water heater of the present invention directly introduces the condensed water generated by the gas water heater into a water collecting box for storage. By adding a filter element device 1 on the pipeline between the condensed water discharge port and the water collecting box, the condensed water is filtered and neutralized, so that the condensed water entering the water collecting box can be directly recycled. In the following embodiments, the filter element device 1 is installed on the gas water heater to illustrate the filtering of the condensed water of the gas water heater.

[0113] Reference Figure 2 The filter element device 1 proposed in the present invention comprises a filter housing 10 and a filter element 20, wherein the filter housing 10 has a water inlet 101 and a water outlet 102; the filter element 20 is arranged in the filter housing 10, the water inlet 101, the filter element 20 and the water outlet 102 are connected in sequence to form a main filtering channel, and a bypass branch 13 connecting the water inlet 101 and the water outlet 102 is arranged between the filter element 20 and the filter housing 10.

[0114] Optionally, the filter housing 10 is used to provide an installation site for the filter element 20, for the filter element 20 to be installed therein, and for being connected to the condensate discharge pipe, so that the condensate enters the filter housing 10 from the water inlet 101 of the filter housing 10, flows through the filter element 20 for filtration, and is discharged from the water storage port of the filter housing 10, so that the impurities in the condensate are preliminarily filtered. Since a bypass branch 13 connecting the water inlet 101 and the water outlet 102 is also provided between the filter element 20 and the filter housing 10, it can be ensured that when the filter element 20 is clogged due to excessive filtering of impurities, the condensate entering the filter element device 1 from the outside can also flow out from the water outlet 102 of the filter housing 10 through the bypass branch 13. This prevents the condensate from flowing back into the condensate discharge pipe, or even overflowing from the smoke pipe, thereby ensuring the normal operation of the machine.

[0115] It should be noted that the bypass branch 13 can be a groove provided on the inner wall surface of the filter housing 10, can be a through hole opened in the filter housing 10, or can be spaced between the filter housing 10 and the filter element 20. The space between the inner wall of the filter housing 10 and the outer wall of the filter element 20 forms the bypass branch 13, which is not limited here.

[0116] Preferably, the water inlet 101 and the water outlet 102 of the filter housing 10 are coaxially arranged, and the filter element 20 is cylindrically designed, with its opposite ends facing the water inlet 101 and the water outlet 102 respectively, and is arranged in a mesh structure. In this way, when the filter element device 1 is placed vertically and the filter element 20 is not blocked, when external condensed water enters the filter element device 1, it can be ensured that all condensed water entering the filter housing 10 is filtered through the main filter channel and then flows out from the water outlet 102 of the filter housing 10. When the condensed water flows through the filter element 20, its internal impurities are blocked, and the clean condensed water flows out from the water outlet 102.

[0117] The technical solution of the present invention adopts a bypass branch 13 connecting the water inlet 101 and the water outlet 102 between the filter element 20 and the filter housing 10. When the filter element 20 is blocked, the condensed water entering the filter element device 1 from the water inlet 101 can flow out from the water outlet 102 through the bypass branch 13, thereby preventing the condensed water from backflowing into the condensed water drainage pipe or even overflowing from the smoke pipe, thereby ensuring the normal operation of the machine.

[0118] In one embodiment, the filter housing 10 includes a cylinder 11 and a cover 12, wherein one end of the cylinder 11 is open, and the other end of the cylinder 11 is provided with the water outlet 102; the cover 12 is covered on the open end of the cylinder 11, and the water inlet 101 is provided on the cover 12.

[0119] Optionally, the filter housing 10 includes a cylinder 11 and a cover 12 which are separately arranged, so as to facilitate the processing of the filter housing 10 and to facilitate the installation of the filter element 20 in the filter housing 10. The cover 12 can be welded and fixed to the open end of the cylinder 11, or the cover 12 can be fixed to the open end of the cylinder 11 by threaded connection to form a cavity for accommodating the filter element 20, so as to facilitate the assembly and disassembly of the filter element 20.

[0120] It should be noted that the barrel 11 can be cylindrical, rectangular or other irregularly shaped, and its shape is not limited here. In this embodiment, the barrel 11 is cylindrical, has a receiving groove with an upper opening, and a water outlet 102 is provided at the bottom of the receiving cavity. The shape and size of the receiving groove are adapted to the filter element 20, and the filter element 20 is used for installation and positioning.

[0121] Furthermore, a first quick-connect pipe protrudes from the periphery of the water outlet 102 in a direction away from the water inlet 101, so as to facilitate connecting the water outlet 102 of the filter element device 1 to an external pipe. Correspondingly, a second quick-connect pipe protrudes from the periphery of the water inlet 101 in a direction away from the water outlet 102, so as to facilitate condensed water to enter the filter element device 1.

[0122] In one embodiment, referring to Figure 3 The inner circumferential wall of the cylinder 11 is provided with a plurality of first positioning protrusions 111, and the plurality of first positioning protrusions 111 are arranged at intervals along the circumference of the cylinder 11. The outer circumferential wall of the filter element 20 abuts against the plurality of first positioning protrusions 111. The inner circumferential wall of the cylinder 11 and the outer circumferential wall of the filter element 20 are arranged at intervals to form an outer cavity 132. The cylinder 11 is formed with a first channel 131 connecting the outer cavity 132 and the water inlet 101, and a second channel 133 connecting the outer cavity 132 and the water outlet 102. The first channel 131, the outer cavity 132 and the second channel 133 form the bypass branch 13.

[0123] In the present embodiment, the first positioning protrusion 111 is a convex strip extending along the axial direction of the cylinder 11. With such a design, compared with the first positioning protrusion 111 being a convex block or a protrusion of other shapes, the contact area between the filter element 20 and the first positioning protrusion 111 is larger, the installation and positioning effect of the filter element 20 is better, and it is more convenient to install the filter element 20 in the cylinder 11. The first positioning protrusion 111 can be arranged at intervals along the circumference of the cylinder 11 in 2, 3, 4, 6, 8 or more numbers, which are not limited here. In the present embodiment, the first positioning protrusion 111 is arranged in a circumferential array along the cylinder 11 in 6 numbers, and the outer peripheral wall of the filter element 20 is in contact with the 6 first positioning protrusions 111 to achieve the installation and positioning of the filter element 20, and the spacing between the outer peripheral wall of each position of the filter element 20 and the inner peripheral wall of the cylinder 11 is consistent, so as to ensure the water discharge effect of the filter element 20.

[0124] In other embodiments, the first positioning protrusion 111 may also be of other structural designs, as long as a gap is created between the outer circumferential wall of the filter element 20 and the inner circumferential wall of the cylinder body 11 , which are not limited here.

[0125] It should be noted that the side wall of the filter element 20 is provided with a plurality of mesh holes. When the bottom of the filter element 20 is blocked, the condensed water in the filter element 20 will be discharged to the outer cavity 132 through the mesh holes on the side wall of the filter element 20, and then discharged through the outer cavity 132, the second channel 133 and the water outlet 102, thereby ensuring normal water flow when the filter element 20 is blocked due to excessive filtering impurities.

[0126] Furthermore, the first channel 131 and the second channel 133 may be through holes opened in the cylinder 11 , or may be strip grooves, which are not limited here, as long as the outer cavity 132 can be connected through the first channel 131 and the second channel 133 .

[0127] In one embodiment, a plurality of second positioning protrusions 112 are protruding from the bottom of the cylinder 11 toward the opening of the cylinder 11 , and the plurality of second positioning protrusions 112 are arranged at intervals along the circumference of the water outlet 102 . The filter element 20 abuts against the second positioning protrusions 112 , and the second channel 133 is formed between two adjacent second positioning protrusions 112 .

[0128] Optionally, the second positioning protrusion 112 is used to support one end of the filter element 20 toward the water outlet 102. By setting the second positioning protrusion 112, a gap is formed between the filter element 20 installed in the cylinder 11 and the bottom of the cylinder 11, for the water collected in the outer cavity 132 to flow in. The second positioning protrusion 112 can be 2, 3, 4, 6, 8 or more arranged at intervals along the circumference of the water outlet 102. The specific number is not specifically limited here, as long as it can play the role of supporting the filter element 20. It can be understood that when the number of second positioning protrusions 112 is more, the support effect on the core body is better, and the area of ​​the second channel 133 is smaller. It can be set according to the needs of use, and is not limited here.

[0129] In this embodiment, there are six second positioning protrusions 112, which are arranged in an array at the bottom of the cylinder 11, and are used to support the filter element 20 accommodated in the cylinder 11, so that a gap is formed between the filter element 20 and the bottom of the cylinder 11. The gap is the second channel 133, which is used to communicate with the outer cavity 132. Compared with opening a hole or a groove in the cylinder 11 to connect the outer cavity 132 with the water outlet 102, the structure of the cylinder 11 is simpler and the conduction effect is better.

[0130] Furthermore, the second positioning protrusion 112 is connected to the first positioning protrusion 111, so that the processing of the cylinder 11 is more convenient, and the second positioning protrusion 112 has a higher strength. In this embodiment, the bottom end of the filter element 20 is concave, and accordingly, the second positioning protrusion 112 is set as a trapezoidal convex rib, and its width gradually increases from the water inlet 101 to the water outlet 102, so as to increase the contact area between the second positioning protrusion 112 and the filter element 20 and enhance its supporting effect.

[0131] In one embodiment, the cover body 12 includes a cover plate 121, and the cover plate 121 is provided with a first side plate 122 and a second side plate 123 protruding toward the cylinder body 11. The first side plate 122 and the second side plate 123 are arranged at intervals along the radial direction of the cover plate 121, and a limiting groove 124 for inserting the cylinder body 11 is formed between the first side plate 122 and the second side plate 123. The second side plate 123 is arranged around the outer periphery of the water inlet 101, and compared with the first side plate 122, the second side plate 123 is closer to the water inlet 101.

[0132] Optionally, the cover plate 121 is plate-shaped and is covered at the open end of the cylinder 11, and is used to limit the filter element 20 in the filter housing 10. Taking the cover plate 121 installed at the upper end of the cylinder 11 as an example for explanation, the cover plate 121 is provided with a first side plate 122 and a second side plate 123 protruding downward, and the first side plate 122 is farther from the water inlet 101 than the second side plate 123. Among them, the inner wall of the first side plate 122 is used to contact the outer peripheral wall of the cylinder 11, so that the cover body 12 and the cylinder 11 are prevented from relative displacement in the circumferential direction. Among them, the spacing between the first side plate 122 and the second side plate 123 matches the wall thickness of the cylinder 11, and the cover plate 121 is covered at the open end of the cylinder 11, and the upper end portion of the cylinder 11 is inserted into the limit groove 124 formed between the first side plate 122 and the second side plate 123, which further increases the connection strength between the cover body 12 and the cylinder 11 and can play a certain sealing role.

[0133] In one embodiment, the outer peripheral wall where the opening end of the cylinder 11 is located is provided with an external thread 113 , the first side plate 122 is provided with an internal thread that matches the thread of the outer peripheral wall, and the cover body 12 is threadedly connected to the cylinder 11 .

[0134] Optionally, in this embodiment, the cover 12 and the barrel 11 are threadedly connected. Compared with welding the cover 12 to the barrel 11, when the filter element 20 is blocked, the cover 12 can be opened to replace the filter element 20 separately, which reduces the difficulty of disassembling and assembling the filter element 20 and saves production costs. Specifically, the inner peripheral wall of the first side plate 122 is provided with an internal thread, and the outer wall surface of the barrel 11 is provided with an external thread 113 that matches the internal thread, so that the cover 12 is threadedly connected to the barrel 11, reducing the difficulty of installing the filter element 20.

[0135] In one embodiment, referring to Figure 4 and Figure 5 The cover plate 121 is provided with a plurality of third positioning protrusions 125 protruding toward the cylinder body 11, and the plurality of third positioning protrusions 125 are arranged at intervals along the circumference of the cover body 12; when the cover body 12 is covered on the cylinder body 11, the plurality of third positioning protrusions 125 abut against the filter element 20, and the first channel 131 is formed between two adjacent third positioning protrusions 125.

[0136] Optionally, the third positioning protrusion 125 is used to abut the filter element 20 to prevent the filter element 20 from axial displacement in the filter housing 10. The third positioning protrusion 125 can be 2, 3, 4, 6, 8 or more circumferentially spaced along the water outlet 102. The specific number is not specifically limited here, as long as it can play the role of positioning the filter element 20. Due to the existence of the third positioning protrusion 125, there is a certain gap between the filter element 20 and the cover plate 121, and the gap is the first channel 131. In this way, when the filter element 20 is completely blocked due to filtering more impurities, the condensed water entering the filter element device 1 from the water inlet 101 will be discharged from the filter element device 1 from the water outlet 102 through the first channel 131, the outer cavity 132 and the second channel 133 in sequence to prevent pipe blockage.

[0137] In this embodiment, the third positioning protrusions 125 may be 6 arranged in a circumferential array along the water outlet 102, which may be square protrusions. The end of the third positioning protrusion 125 away from the water outlet 102 is connected to the second side plate 123. In this way, in order to increase the structural strength of the third positioning protrusion 125, the size of the third positioning protrusion 125 can be set to be relatively lower, and the area of ​​the first channel 131 is larger, that is, the conduction effect of the bypass branch 13 is better and it is not easy to be blocked.

[0138] In one embodiment, the filter element device 1 further includes a sealing member 30 , and the sealing member 30 is disposed between the first side plate 122 and the cylinder body 11 .

[0139] Optionally, the seal 30 may be a sealing ring, and the sealing ring is made of corrosion-resistant fluororubber. The sealing ring is installed between the first side plate 122 and the cylinder 11 to radially seal the cylinder 11, avoid sealing problems caused by the screw not being in place, and ensure the sealing reliability of the filter element device 1. Specifically, the upper end portion of the external thread section of the cylinder 11 has an annular groove, and the sealing ring is sleeved in the annular groove. When the cover body 12 and the cylinder 11 are connected together by threads, the sealing ring radially seals the cylinder 11, avoids sealing problems caused by the screw not being in place, and ensures the sealing reliability of the filter element device 1.

[0140] In one embodiment, a filter cavity 201 for placing filter media is provided in the filter element 20 .

[0141] It should be noted that since the water vapor in the medium-temperature flue gas will condense into liquid condensed water while releasing latent heat, and the CO2 and NO XAcidic gases such as acidic gases will dissolve in condensed water, making it corrosive. Therefore, in this embodiment, a filter cavity 201 is formed inside the filter element 20 for placing filter material, and the filter material is a neutralizing filter material. In this way, when condensed water flows into the filter element 20, the filter material placed in the filter cavity 201 can play a role in neutralizing the acidic condensed water. In this way, the condensed water discharged from the water outlet 102 of the filter element device 1 is treated neutral water, which will not corrode the pipeline and can be directly recycled.

[0142] In one embodiment, the filter element 20 includes a first filter cover 21 and a filter cartridge 222 . The filter body 22 is provided with a mounting groove 221 with an open end. The first filter cover 21 is provided at the open end of the filter body 22 to form the filter cavity 201 .

[0143] Optionally, the filter element 20 includes a first filter cover 21 and a filter cartridge 222 that are separately arranged, so that it is convenient for the user to fill the filter material into the filter cavity 201. When the filter element 20 is blocked, the filter material can be replaced separately and the filter element 20 can be cleaned without replacing the filter element 20 as a whole, thereby reducing the cost of use.

[0144] Specifically, the filter cartridge 222 is cylindrical with one end open, the first filter screen cover 21 is a circular filter screen, and the periphery of the first filter screen is protruded toward the filter cartridge 222 with a side plate. When the first filter screen cover 21 is covered on the open end of the filter cartridge 222, the mounting groove 221 is closed to prevent the filter material installed in the filter chamber 201 from falling out, and the inner peripheral wall of the side plate abuts against the outer peripheral wall of the filter cartridge 222 to limit the relative displacement of the first filter screen cover 21 and the filter cartridge 222 along the circumferential direction. In this embodiment, in order to facilitate the filling and replacement of the filter material, the first filter screen cover 21 does not need to be fixed by welding. When the cover body 12 is covered on the filter housing 10, the cover body 12 abuts against the first filter screen cover 21 to limit the relative distance between the first filter screen cover 21 and the filter cartridge 222 along the axial direction.

[0145] In one embodiment, the filter body 22 includes a filter cartridge 222 with openings at both ends and a second filter cover 223 , the first filter cover 21 is disposed at one of the opening ends of the filter cartridge 222 , and the second filter cover 223 is installed at the other opening end of the filter cartridge 222 .

[0146] It is understandable that when the filter body 22 is designed as a cylinder with one end open, its production and processing is relatively difficult, and it is not convenient to produce the entire filter element device 1. Therefore, in this embodiment, the filter body 22 is composed of two parts: a filter cartridge 222 and a second filter cover 223. The filter cartridge 222 is arranged in a cylindrical shape, and the second filter cover 223 is fixedly installed on the opening of the filter cartridge 222 away from the first filter cover 21 by welding or other means, so as to facilitate the filling of filter materials.

[0147] It should be noted that, in this embodiment, the first filter cover 21 is configured as a mesh structure, which is beneficial for condensed water to enter the filter element 20. Correspondingly, the second filter cover 223 is configured as a mesh structure, which is beneficial for timely discharge of neutralized water in the filter element 20, reduces flow resistance, avoids the risk of blockage caused by blockage of the filter mesh at a single position, and can timely divert the condensed water neutralized by the filter element 20.

[0148] Furthermore, the filter cartridge 222 serves as the main supporting structure of the filter material, and a plurality of mesh holes are also provided on its surface, connecting the bypass branch 13 with the filter chamber 201, ensuring that the neutralized condensed water can be discharged from the mesh holes, while blocking and filtering impurities.

[0149] In one embodiment, the first filter cover 21 and / or the second filter cover 223 are recessed toward the water outlet 102 .

[0150] In the present embodiment, the first filter cover 21 and the second filter cover 223 are both recessed from the water inlet 101 to the water outlet 102. Take the water inlet 101 being disposed above the filter housing 10 and the water outlet 102 being disposed below the filter housing 10 as an example for explanation. The first filter cover 21 and the second filter cover 223 are both disposed in a downwardly recessed arc shape. In this way, when the first filter cover 21 is recessed downward, it helps to concentrate the condensed water entering from the water inlet 101, ensuring that the condensed water flows through the filter cartridge 222 to achieve a sufficient neutralization effect. When the second filter cover 223 is disposed in a downwardly recessed arc concave surface, more filter material can be loaded into the filter element 20 while the height of the filter cartridge 222 remains unchanged.

[0151] The present invention also provides a filter device, which includes a filter element device 1. The specific structure of the filter element device 1 refers to the above embodiment. Since the filter device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The filter device also includes filter material, which is installed in the filter element 20 to make its filtering effect better.

[0152] Furthermore, the filter material is a neutralizer particle, which is used to neutralize the acidity of the condensed water, so that the filter device can filter and neutralize the condensed water, and the condensed water can be recycled without corroding the pipeline.

[0153] The present invention also proposes a gas water heater, which is a condensing gas water heater, including a filter device 1. The specific structure of the filter device 1 refers to the above embodiment. Since the gas water heater adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Alternatively, the gas water heater includes a filter device. The specific structure of the filter device refers to the above embodiment. Since the gas water heater adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0154] In some embodiments, the condensing gas water heater of the present invention includes a filter device 1, which includes a filter housing 10 having a water outlet 102 and a water inlet 101 and a filter element 20 disposed in the filter housing 10, the water inlet 102, the filter element 20 and the water outlet 101 are sequentially connected to form a main filter channel, the condensate neutralizer of the present invention is installed in the filter element 20, the condensate flows into the filter element 20 containing the condensate neutralizer through the water inlet 101, and flows out through the water outlet 101 after the neutralization reaction is completed. The corrosiveness of the condensate that has completed the neutralization reaction is weakened, which can reduce the corrosion of house facilities such as walls, floors, floor drains, and sewer pipes.

[0155] In another embodiment, a bypass branch 13 connecting the water inlet 101 and the water outlet 102 is further provided between the filter element 20 and the filter housing 10. When external liquid enters the filter device 1, it flows out from the water outlet 102 after being filtered through the main filter channel. When the filter element 20 is blocked, condensed water entering the filter element device 1 from the water inlet 101 can flow out from the water outlet 102 through the bypass branch 13, thereby preventing condensed water from flowing back into the condensed water drainage pipe or even overflowing from the smoke pipe, thereby ensuring the normal operation of the machine and preventing the condensed water neutralizer of the present invention from being difficult to meet the requirement of free replacement within a service life of more than 10 years due to equipment factors.

[0156] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing a condensed water neutralizer, characterized in that: The following steps are involved: mixing a magnesium-containing compound with a flux and water to form a wet powder; Granulating the wet powder to form granules; The granular material is dried, melt-calcined, cooled, and crushed to obtain a granular condensed water neutralizer.

2. The method for preparing the condensed water neutralizer according to claim 1, characterized in that: The magnesium-containing compound includes at least one of magnesium carbonate, magnesium hydroxide, magnesium sulfate, magnesium nitrate and magnesium chloride.

3. The method for preparing the condensed water neutralizer according to claim 2, characterized in that: The magnesium-containing compound is magnesium carbonate.

4. The method for preparing the condensed water neutralizer according to claim 3, characterized in that: During the melt calcination process, the reaction process of the magnesium carbonate is as follows: MgCO3→MgO+CO2↑.

5. The method for preparing the condensed water neutralizer according to claim 1, characterized in that: The flux includes at least one of boron oxide, calcium oxide and phosphorus oxide.

6. The method for preparing the condensed water neutralizer according to claim 1, characterized in that: In the step of forming the wet powder, the following steps are included: The magnesium-containing compound is mixed with the flux and then sprayed with water to form the wet powder.

7. The method for preparing the condensed water neutralizer according to claim 1, characterized in that: The drying temperature is 120° C.-180° C.; and / or the drying time is 2 h-4 h.

8. The method for preparing the condensed water neutralizer according to claim 1 is characterized in that: The particle size of the granular material ranges from 1 mm to 5 mm.

9. The method for preparing the condensed water neutralizer according to claim 1 is characterized in that: The granular object is spherical.

10. The method for preparing the condensed water neutralizer according to claim 1, characterized in that: The temperature of the melt calcination is 1200° C.-1800° C.; and / or the time of the melt calcination is 2 h-4 h.

11. The method for preparing the condensed water neutralizer according to claim 1, characterized in that: Based on 100% of the total mass of the magnesium-containing compound, the amount of the flux added is 0.1%-1%; And / or, based on 100% of the total mass of the magnesium-containing compound, the amount of water added is 10%-20%.

12. A condensed water neutralizer prepared by the preparation method according to any one of claims 1 to 11.

13. The condensed water neutralizer according to claim 12, characterized in that: The content of magnesium oxide in the condensed water neutralizer is above 95%.

14. The condensed water neutralizer according to claim 12, characterized in that: The particle size range of the condensed water neutralizer is 1 mm to 5 mm.

15. Use of the condensed water neutralizer according to any one of claims 12 to 14 in a condensing gas water heater.

16. The use of the condensed water neutralizer in a condensing gas water heater according to claim 15, characterized in that: 100g-150g of the condensate neutralizer can meet the neutralization demand for condensate of the condensing gas water heater with a capacity below 18L during a service life of more than 10 years.

17. A condensing gas water heater, characterized in that: The condensing gas water heater comprises the condensed water neutralizer according to any one of claims 12 to 14.

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