Condensate neutralizer, method for preparing and using same, and condensing gas water heater

Abstract

The application discloses a condensed water neutralizer, a preparation method and application thereof, and a condensing 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 material; granulating the wet powder material to form granular material; and drying, melting, calcining, cooling and crushing the granular material to obtain the granular condensed water neutralizer. The condensed water neutralizer obtained through the above preparation method is a coarse crystal body with moderate activity, and the main neutralizing component is magnesium oxide. The condensed water neutralizer has the advantages of hard texture, good weather resistance, good selective reactivity, water insolubility, reaction with only acidic substances in condensed water, good water solubility of magnesium sulfate generated in the neutralization reaction, difficulty in coating on the surface to prevent the subsequent neutralization reaction, long-acting slow-release purpose, and the like. When the condensed water neutralizer is applied to the condensing gas water heater, a small amount of addition can meet the requirement of free replacement within more than 10 years of use, and great convenience is brought to users.

Description

Technical Field

[0001] This invention relates to the field of water treatment, and more particularly to a condensate neutralizer, its preparation method and application, and a condensing gas water heater. Background Technology

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

[0003] In related technologies, calcium carbonate is commonly used as a neutralizing agent for condensate water in condensing gas water heaters. Calcium carbonate is widely available and inexpensive, but it readily reacts with sulfate ions in the condensate water to form calcium sulfate, which is poorly soluble in water. This calcium sulfate coats the surface of the neutralizing agent, causing neutralization failure, thus requiring frequent replacement of the neutralizing agent, which is inconvenient for users. In contrast, magnesium carbonate or magnesium oxide both have good neutralizing capabilities, and the resulting magnesium sulfate is highly water-soluble and does not coat the material surface, preventing neutralization failure. However, currently commercially available magnesium carbonate and magnesium oxide are all in powder form, have high reactivity, lack slow-release properties, and cannot be used directly. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a condensate neutralizer, its preparation method and application, and a condensing gas water heater.

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

[0006] Magnesium-containing compounds are mixed with flux and water to form a wet powder.

[0007] The wet powder is granulated to form granules;

[0008] The granular material is dried, melted and calcined, cooled and pulverized to obtain a granular condensate neutralizer.

[0009] In some embodiments of this 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 this application, the magnesium-containing compound is magnesium carbonate.

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

[0012] MgCO3→MgO+CO2↑.

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

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

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

[0016] In some embodiments of this application, the particle size range of the granules is 1 mm to 5 mm.

[0017] In some embodiments of this application, the granules are spherical.

[0018] In some embodiments of this application, the melting and calcination temperature is 1200℃-1800℃; and / or, the melting and calcination time is 2h-4h.

[0019] In some embodiments of this application, based on 100% of the total mass of the magnesium-containing compound, the amount of 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 objectives, the present invention also provides a condensate neutralizer prepared by the preparation method described above.

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

[0023] In some embodiments of this application, the particle size range of the neutralizing agent in the condensate is 1 mm to 5 mm.

[0024] To achieve the above objectives, the present invention also provides an application of the condensate neutralizer described above in a gas water heater.

[0025] In some embodiments of this application, 100g-150g of the condensate neutralizer can meet the neutralization requirements of condensate water in condensing gas water heaters with a capacity of less than 18L for more than 10 years.

[0026] To achieve the above objectives, the present invention also provides a condensing gas water heater, wherein the condensing gas water heater includes the condensate neutralizer described above.

[0027] The beneficial effects that this invention can achieve are:

[0028] This invention utilizes magnesium-containing compounds as the main raw material. The condensate neutralizer prepared through processes such as mixing, granulation, drying, melting and calcining, cooling, and pulverizing is a coarse-grained substance with moderate activity and relatively large particle size. Magnesium oxide is the main neutralizing component. It is hard, weather-resistant, and exhibits good selective reactivity. It is insoluble in water and only reacts with acidic substances in condensate. The resulting magnesium sulfate is highly water-soluble and does not easily coat the surface of the condensate neutralizer, preventing further neutralization reactions. This allows for long-lasting, slow-release effects. When applied to condensing gas water heaters, only a small amount needs to be added to meet the requirement of no replacement for over 10 years of use, bringing great convenience to users. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the preparation process of a condensate neutralizer according to the present invention.

[0031] Figure 2 This is an exploded view of the structure of an embodiment of the filter element device of the present invention;

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

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

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

[0035] Explanation of icon numbers

[0036]

[0037]

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

[0039] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] In this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0042] This invention provides a condensate neutralizer and its preparation method, referring to... Figure 1 The preparation method of the condensate neutralizer includes the following steps:

[0043] Step S10: Mix the magnesium-containing compound with flux and water to form a wet powder;

[0044] Step S20: Granulate the wet powder to form granules;

[0045] Step S30: Dry, melt-calcine, cool, and pulverize the granular material to obtain granular condensate neutralizer.

[0046] This invention uses magnesium-containing compounds as the main raw material and processes mixing, granulation, drying, melting and calcining, cooling, and pulverizing to prepare a condensate neutralizer with magnesium oxide as the main neutralizing component. In existing technologies, neutralizers with calcium carbonate as the main component are easily coated with water-insoluble calcium sulfate by the neutralization reaction, preventing them from maintaining their neutralizing function for extended periods and requiring frequent replacement. In contrast, the condensate neutralizer of this invention neutralizes condensate to form magnesium sulfate, which is highly water-soluble and does not coat the surface of the neutralizer, thus preventing subsequent neutralization failure and meeting the requirement of long-term use without replacement.

[0047] Furthermore, the magnesium-containing compound of the present invention is calcined in a molten state, and after calcination and cooling, a block-shaped product can be obtained. Combined with a pulverization process, it is beneficial to obtain a coarse-crystalline condensate water neutralizer with a hard texture, good weather resistance, and moderate activity. It has slow-release characteristics and good selective reactivity. It is insoluble in water and only reacts with acidic substances in water. Compared with the neutralizers in the prior art that are mainly composed of powdered magnesium carbonate and magnesium oxide, it can achieve the purpose of long-term slow release. When applied to condensing gas water heaters, a small amount can meet the requirement of no replacement for more than 10 years of use, bringing 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. Using the above-mentioned magnesium-containing compound as the main raw material, a condensate neutralizer with magnesium oxide as the main component can be formed during the subsequent melting and calcination process. After the magnesium oxide and condensate undergo a neutralization reaction, water-soluble magnesium sulfate is formed, which is difficult to coat the surface of the condensate neutralizer, leading to subsequent neutralization failure.

[0049] In some embodiments, the magnesium-containing compound is magnesium carbonate. Magnesium carbonate has the advantages of good safety performance, low cost and easy availability, and can yield magnesium oxide with high yield and purity, which is beneficial for increasing the magnesium oxide content in the neutralizing agent of the condensate and enhancing the neutralization effect. The reaction equation for magnesium carbonate as a raw material in the subsequent melting and calcination process is as follows:

[0050] MgCO3→MgO+CO2↑.

[0051] The calcination temperature required to bring magnesium-containing compounds to a molten state is relatively high. Therefore, this invention mixes a flux with the magnesium-containing compound before calcination. The flux effectively lowers the melting temperature of the magnesium-containing compound and the temperature at which it decomposes into magnesium oxide during calcination, thus reducing energy consumption.

[0052] In some embodiments, the flux includes at least one of boron oxide, calcium oxide, and phosphorus oxide. These fluxes help magnesium compounds to quickly enter a molten state at relatively low temperatures, decompose to form magnesium oxide under relatively low calcination conditions, and produce fewer byproducts, thus minimizing the impact on the purity of magnesium oxide in the condensate neutralizer.

[0053] This invention does not limit the specific method of mixing magnesium-containing compounds with flux and water to form a wet powder. In some embodiments, the magnesium-containing compound and flux can be mixed first to obtain a dry powder. For example, the dry powder can be thoroughly stirred in a mixing tank to obtain a uniform dry powder, and then water can be sprayed onto the dry powder to moisten it and form a wet powder. The above method can obtain a wet powder with uniform moisture content, which is more conducive to obtaining granules with better compactness in the subsequent granulation process. This prevents the neutralizing agent in the final condensate from being too loose, having strong reactivity, and being unable to achieve a slow-release effect.

[0054] In some embodiments, based on 100% of the total mass of magnesium compounds, the flux addition amount is 0.1%-1%; and / or, the water addition amount is 10%-20%. For example, based on 100% of the total mass of magnesium compounds, the flux addition amount is any value in the range of 0.1%-1%, such as 0.1%, 0.3%, 0.5%, 0.8%, 0.9%, 1%, etc.; and / or, the water addition amount is any value in the range of 10%-20%, such as 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, etc. Under the above addition conditions, it is beneficial to obtain a wet powder with suitable moisture content, so that granules with better compactness can be obtained in the subsequent granulation process, and the heating can be more uniform during melting and calcination. It also helps the magnesium compounds to quickly enter the molten state and decompose to generate magnesium oxide under relatively low calcination conditions.

[0055] In this invention, a granulation process (S20) is performed before the raw materials are melted and calcined. The granules obtained after granulation change from a loose to a compact state, preventing the material from becoming powdery during subsequent melting and calcination. Powdered neutralizing agents are too reactive, reacting too quickly in the condensate neutralization process, resulting in poor slow-release effects and failing to meet the requirement of not needing replacement for over 10 years of use in condensing gas water heaters. Furthermore, the granules are heated more evenly during subsequent melting and calcination, further promoting the decomposition of magnesium compounds and yielding a high-yield, high-purity magnesium oxide neutralizing agent for condensate.

[0056] In some embodiments, the granules are spherical, formed by mixing wet powder in a pelletizing machine. Spherical granules have better density, are less prone to pulverization and easier to transfer, and are heated more uniformly, which is beneficial for promoting the calcination and decomposition of magnesium-containing compounds and quickly obtaining a condensate neutralizer with magnesium oxide as the main component.

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

[0058] This invention granulates and then dries the wet powder, which also facilitates subsequent melting and calcination. In some embodiments, the drying temperature is 120℃-180℃; and / or, the drying time is 2h-4h. For example, the drying temperature is any temperature within the range of 120℃-180℃, such as 120℃, 125℃, 130℃, 135℃, 140℃, 150℃, 160℃, 170℃, 175℃, or 180℃.

[0059] This invention does not limit the method of drying granules. In some embodiments, the granules can be spread out and conveyed by a conveyor belt to a preheated dryer for drying. These methods can promote rapid drying of the granules.

[0060] In some embodiments, the melting and calcining temperature is 1200℃-1800℃; and / or, the melting and calcining time is 2h-4h. For example, the melting and calcining temperature can be any temperature value within the range of 1200℃-1800℃, such as 1200℃, 1250℃, 1300℃, 1350℃, 1400℃, 1450℃, 1500℃, 1550℃, 1600℃, 1650℃, 1700℃, 1750℃, 1800℃, etc.; and / or, the melting and calcining time can be any time value within 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, etc.

[0061] During the molten calcination of magnesium-containing compounds, the compounds gradually decompose, releasing water, carbon dioxide, or sulfur dioxide, and melt to form small magnesium oxide crystals. The released gases contribute to the porous nature of the magnesium oxide crystals, resulting in high reactivity. Under the molten calcination conditions described in this invention, as the calcination time increases, the small magnesium oxide crystals aggregate into dense, large crystals in the molten state under the influence of intramolecular cohesion. The pores gradually close, and the reactivity decreases accordingly. Therefore, the activity of the neutralizing agent in the condensate water can be controlled by adjusting the molten calcination temperature and duration, achieving a slow-release effect. A small amount added is sufficient to meet the requirement of not needing replacement for over 10 years of use in condensing gas water heaters, bringing great convenience to users.

[0062] Understandably, the above restrictions on melting and calcination temperature and melting and calcination time can be met by satisfying one or both. If all are satisfied, it is easier to control the activity of the neutralizing agent in the condensate and achieve a slow-release effect.

[0063] In some embodiments, the melting and calcination operation can be carried out in a calcining furnace. The dried granules are loaded into a crucible, placed in the calcining furnace, and heated to a molten state for calcination. After the calcination operation is completed, the material is removed and allowed to cool naturally.

[0064] During the melting and calcination process, the raw materials are in a molten and mixed state. After cooling, the raw materials are in block form, so they need to be crushed. In some embodiments, after the cooling process is completed, a crusher can be used to crush the materials, and then the condensate neutralizer of the required particle size can be screened out.

[0065] In some embodiments, the particle size range of the neutralizing agent in the condensate is 1mm-5mm. For example, it can be any particle size within the 1mm-5mm range, such as 1mm, 2mm, 3mm, 4mm, 5mm, etc. Because the particle size of condensate droplets is very small, typically on the millimeter scale, a neutralizing agent with a particle size of less than 5mm has a similar particle size to condensate, which can increase the contact area between the neutralizing agent and the condensate, thus accelerating the neutralization reaction.

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

[0067] The condensate neutralizer of this invention has stable chemical properties, good weather resistance, does not decompose when immersed in water for a long time, and has good slow-release performance. Only 100g-150g is needed to meet the neutralization needs of condensate water in condensing gas water heaters with a capacity of less than 18L for more than 10 years. Its neutralization performance is far superior to commercially available neutralizers, and it has a high market application prospect.

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

[0069] Example 1

[0070] This embodiment relates to a method for preparing a condensate neutralizer, which includes the following steps:

[0071] S10. Weigh 100 parts magnesium carbonate and 0.15 parts boron oxide by weight, put them into a mixing tank and mix them thoroughly. Then, spray 15 parts water while stirring to moisten the mixture and obtain wet powder.

[0072] S20. Place the wet powder into a pelletizing machine and mix it into spherical particles with a particle size of 1mm-5mm, so that the wet powder changes from a loose state to a compact state.

[0073] S30. Spread the granules out and convey them to a dryer heated to 140°C via a conveyor belt. Maintain the temperature for 2 hours to dry. Place the dried granules into a crucible and transfer it to a calcining furnace. Heat the furnace to 1500°C and keep it at that temperature for 4 hours. Then turn off the heating, remove the granules and let them cool naturally. Then crush them in a stone crusher and sieve out particles with a diameter of 1mm-5mm to obtain granular condensate neutralizing agent.

[0074] Example 2

[0075] This embodiment relates to a method for preparing a condensate neutralizer, which includes the following steps:

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

[0077] S20. Place the wet powder into the pelletizing machine and mix it into 1-5mm spherical particles, so that the wet powder changes from a loose state to a compact state.

[0078] S30. Spread the granular material out and convey it to a dryer heated to 160°C via a conveyor belt. Maintain the drying temperature for 3 hours. Place the dried spherical material into a crucible and put it into a calcining furnace. Heat the crucible to 1600°C and keep it at that temperature for 3.5 hours. Then turn off the heating, remove the material and let it cool naturally. Then put it into a crusher to crush it and sieve out particles with a particle size of 1mm-5mm to obtain granular condensate neutralizer.

[0079] Example 3

[0080] This embodiment relates to a method for preparing a condensate neutralizer, which includes the following steps:

[0081] S10. Weigh 100 parts magnesium sulfate and 0.5 parts boron oxide by weight, put them into a mixing tank and mix them thoroughly. Then, spray 20 parts water while stirring to moisten the mixture and obtain wet powder.

[0082] S20. Place the wet powder into the pelletizing machine and mix it into 1-5mm spherical particles, so that the wet powder changes from a loose state to a compact state.

[0083] S30. Spread the granular material out and convey it to a dryer heated to 180°C via a conveyor belt. Maintain the drying temperature for 2 hours. Place the dried spherical material into a crucible and put it into a calcining furnace. Heat the crucible to 1800°C and keep it at that temperature for 2 hours. Then turn off the heating, remove the material and let it cool naturally. Then put it into a crusher to crush it and sieve out particles with a particle size of 1mm-5mm to obtain granular condensate neutralizer.

[0084] Example 4

[0085] This embodiment relates to a method for preparing a condensate neutralizer, which includes the following steps:

[0086] S10. Weigh 100 parts magnesium carbonate and 1 part phosphorus oxide by weight, put them into a mixing tank and mix them thoroughly. Then, under stirring conditions, spray 20 parts water to moisten the mixture and obtain wet powder.

[0087] S20. Place the wet powder into the pelletizing machine and mix it into 1-5mm spherical particles, so that the wet powder changes from a loose state to a compact state.

[0088] S30. Spread the granular material out and convey it to a dryer heated to 120°C via a conveyor belt. Maintain the drying temperature for 4 hours. Place the dried spherical material into a crucible and put it into a calcining furnace. Heat the crucible to 1200°C and keep it at that temperature for 4 hours. Then turn off the heating, remove the material and let it cool naturally. Then put it into a crusher to crush it and sieve out particles with a particle size of 1mm-5mm to obtain granular condensate neutralizer.

[0089] Example 5

[0090] This embodiment relates to a method for preparing a condensate neutralizer, which includes the following steps:

[0091] S10. Weigh 100 parts magnesium hydroxide and 0.8 parts boron oxide by weight, put them into a mixing tank and mix them thoroughly. Then, spray 15 parts water while stirring to moisten the mixture and obtain wet powder.

[0092] S20. Place the wet powder into the pelletizing machine and mix it into 1-5mm spherical particles, so that the wet powder changes from a loose state to a compact state.

[0093] S30. Spread the granular material out and convey it to a dryer heated to 150°C via a conveyor belt. Maintain the drying temperature for 3 hours. Place the dried spherical material into a crucible and put it into a calcining furnace. Heat the crucible to 1400°C and keep it at that temperature for 2.5 hours. Then turn off the heating, remove the material and let it cool naturally. Then put it into a crusher to crush it and sieve out particles with a particle size of 1mm-5mm to obtain granular condensate neutralizer.

[0094] Comparative Example 1

[0095] Commercially available condensate neutralizers with calcium carbonate as the main component.

[0096] Comparative Example 2

[0097] Commercially available condensate neutralizers with powdered magnesium oxide as the main component.

[0098] Comparative Example 3

[0099] Comparative Example 3 follows the same preparation method as Example 1, but the difference is that Comparative Example 3 is not calcined in a molten state. After the calcination is completed, the resulting product has a small particle size, so no subsequent crushing and sieving operations are performed.

[0100] Performance testing

[0101] Take 125g of the condensate neutralizer obtained in this example and the condensate neutralizer of the comparative example, respectively, and prepare an aqueous solution with pH=3.0 using a mixed acid of nitric acid:sulfuric acid = 5:1 (V / V). Continuously pass the condensate neutralizer obtained in this example and the condensate neutralizer of the comparative example through the flow rate of 20ml / min. Record the pH value of the flow solution every 500L of water. The test data are shown in Table 1.

[0102] Table 1 Comparison of neutralization effects of the neutralizing agents in the condensate of the examples and comparative examples.

[0103]

[0104] As shown in Table 1, after the aqueous solution with pH=3.0 is neutralized by the condensate neutralizer of the present invention, the pH increases significantly, and the outflow liquid no longer has a strong acidity. This can solve the technical problem of direct discharge of condensate corroding walls, floors, floor drains, sewer pipes and other building facilities.

[0105] Furthermore, the condensate neutralizer of this invention, after neutralizing 3000L of aqueous solution, can significantly increase the pH of the aqueous solution and reduce its corrosiveness. Calculations show that the neutralization amount of 3000L of water is equivalent to the total amount of condensate generated during approximately 10 years of use of a typical 16L household condensing gas water heater. In other words, 125 grams of this neutralizer can eliminate the need for replacement within the designed lifespan of the gas water heater. This demonstrates that the condensate neutralizer of this invention has excellent slow-release properties, meeting the requirement of long-term use without replacement, and possesses strong commercial value.

[0106] Comparative Example 1 used a neutralizing agent with calcium carbonate as the main component. This neutralizing agent readily reacted with sulfate ions in the condensate, forming calcium sulfate, which is poorly soluble in water. The calcium sulfate coated the surface of the calcium carbonate neutralizing agent, causing subsequent neutralization to fail. At a flow rate of 1000L, it was difficult to reduce the acidity of the aqueous solution; the pH of the outflow was 3.57, indicating strong corrosiveness. Therefore, condensate neutralizing agents with calcium carbonate as the main component require frequent replacement to improve the problem of direct discharge of condensate corroding walls, floors, floor drains, and sewer pipes, making it difficult to meet the requirement of a 10-year lifespan without replacement for condensing gas water heaters.

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

[0108] Comparative Example 3 was not calcined in the molten state. After drying and cooling, it formed relatively loose particles with strong reactivity. It had a good neutralization effect before the water flow rate was 500L. However, the neutralization effect was significantly reduced when the water flow rate was 1000L. It did not have the characteristics of slow release and could not meet the requirement of long-term use without replacement.

[0109] The present invention also provides a condensing gas water heater, which includes the condensate neutralizer described above. The condensate neutralizer neutralizes the generated condensate, preventing corrosion of walls, floors, floor drains, sewer pipes and other building facilities. Moreover, only a small amount needs to be added to meet the requirement of no replacement for more than 10 years of use, bringing great convenience to users.

[0110] A gas water heater, also known as a gas-fired water boiler, is a gas appliance that uses gas as fuel and heats water by transferring heat to cold water flowing through a heat exchanger. A gas water heater mainly consists of a valve assembly, main burner, pilot burner, heat exchanger, and safety devices. It may also include the flue of a flue-type water heater and the forced draft device of a forced draft water heater. The valve assembly controls the entire operation of the water heater and includes the water valve, gas valve, microswitch, and igniter. During installation, valves should be installed on the inlet water pipe, outlet water pipe, and gas pipe.

[0111] After a single heat exchange, a typical gas water heater usually produces medium-temperature flue gas at around 180℃. This medium-temperature flue gas contains CO2 and NO. XGas water heaters contain high levels of CO2 and NOx, and their direct emission of these gases not only pollutes the environment but also results in significant heat loss. To avoid this environmental pollution and heat waste, condensing gas water heaters were developed. Condensing gas water heaters utilize a condensing heat exchanger for secondary heat exchange, preheating the water and recovering the latent heat of the medium-temperature flue gas, thus improving gas utilization and significantly reducing the temperature of the exhaust gas. Because the water vapor in the medium-temperature flue gas condenses into liquid condensate while releasing its latent heat, and because the flue gas also contains CO2 and NOx... X Acidic gases can dissolve in condensate, making it corrosive. Therefore, condensing gas water heaters typically require a condensate drain pipe to remove acidic condensate from the machine. Before discharge, a neutralizer is used to remove the corrosiveness of the condensate. For condensate disposal, users can temporarily store it in a container and empty it periodically; alternatively, a drain pipe can be installed connecting it to the home's sewer system. Clearly, the presence of a condensate drain pipe and the discharge of condensate cause considerable inconvenience and are unsightly; direct discharge of condensate also wastes water resources.

[0112] The gas water heater proposed in this invention is a condensing gas water heater. The gas water heater of this invention directly introduces the condensate produced by the gas water heater into the water collection box for storage. By adding a filter element device 1 to the pipeline between the condensate outlet and the water collection box, the condensate is filtered and neutralized, so that the condensate entering the water collection box can be directly recycled. In the following embodiments, the filter element device 1 is installed on the gas water heater to filter the condensate of the gas water heater.

[0113] Reference Figure 2 The filter element device 1 proposed in this invention includes a filter housing 10 and a filter element 20. The filter housing 10 has an inlet 101 and an outlet 102. The filter element 20 is disposed inside the filter housing 10. The inlet 101, the filter element 20 and the outlet 102 are connected in sequence to form a main filtration channel. A bypass branch 13 connecting the inlet 101 and the outlet 102 is provided between the filter element 20 and the filter housing 10.

[0114] Optionally, the filter housing 10 provides an installation location for the filter element 20, allowing it to be installed within the housing and connecting to the condensate drain pipe. Condensate enters the filter housing 10 through the inlet 101, flows through the filter element 20 for filtration, and then exits through the storage port of the filter housing 10, thus performing preliminary filtration of impurities in the condensate. Because a bypass branch 13 connecting the inlet 101 and outlet 102 is also provided between the filter element 20 and the filter housing 10, it ensures that even if the filter element 20 becomes clogged due to excessive impurities, condensate entering the filter housing 1 can still flow out through the bypass branch 13 from the outlet 102 of the filter housing 10. This prevents condensate from flowing back into the condensate drain pipe or even overflowing from the flue, 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, a through hole opened in the filter housing 10, or the filter housing 10 and the filter element 20 can be spaced apart, with the bypass branch 13 formed by the space between the inner wall of the filter housing 10 and the outer wall of the filter element 20. It is not limited here.

[0116] Preferably, the inlet 101 and outlet 102 of the filter housing 10 are coaxially arranged, and the filter element 20 is cylindrical, with its opposite ends facing the inlet 101 and outlet 102 respectively, and is configured with a mesh structure. Thus, when the filter element device 1 is placed vertically, if the filter element 20 is not clogged, when external condensate enters the filter element device 1, it can be ensured that all condensate entering the filter housing 10 is filtered through the main filtration channel and flows out from the outlet 102 of the filter housing 10. When the condensate flows through the filter element 20, impurities inside are blocked, while clean condensate flows out from the outlet 102.

[0117] The technical solution of the present invention employs a bypass branch 13 between the filter element 20 and the filter housing 10, which connects the inlet 101 and the outlet 102. When the filter element 20 is blocked, the condensate entering the filter element device 1 from the inlet 101 can flow out from the outlet 102 through the bypass branch 13, thereby preventing the condensate from flowing back into the condensate drain pipe or even overflowing from the flue, thus ensuring the normal operation of the machine.

[0118] In one embodiment, the filter housing 10 includes a cylindrical body 11 and a cover 12. One end of the cylindrical body 11 is open, and the other end of the cylindrical body 11 is provided with the water outlet 102. The cover 12 covers the open end of the cylindrical body 11, and the water inlet 101 is provided on the cover 12.

[0119] Optionally, the filter housing 10 includes a separate cylindrical body 11 and a cover 12 to facilitate the processing of the filter housing 10 and to facilitate the installation of the filter element 20 inside the filter housing 10. The cover 12 can be welded to the open end of the cylindrical body 11, or it can be fixed to the open end of the cylindrical body 11 by a threaded connection to form a cavity for accommodating the filter element 20, thus facilitating the assembly and disassembly of the filter element 20.

[0120] It should be noted that the cylinder 11 can be cylindrical, rectangular, or other irregularly shaped; its shape is not limited here. In this embodiment, the cylinder 11 is cylindrical with an open upper end receiving groove. An 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 for installation and positioning of the filter element 20.

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

[0122] In one embodiment, reference is made to Figure 3 The inner circumferential wall of the cylinder 11 is provided with a plurality of first positioning protrusions 111, which are spaced apart 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 spaced apart to form an outer cavity 132. The cylinder 11 forms 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 this embodiment, the first positioning protrusion 111 is a convex strip extending axially along the cylinder 11. This design, compared to a protrusion block or other shaped protrusion, provides a larger contact area between the filter element 20 and the first positioning protrusion 111, resulting in better installation and positioning of the filter element 20 and facilitating its installation within the cylinder 11. The first positioning protrusion 111 can be arranged in 2, 3, 4, 6, 8, or more intervals along the circumference of the cylinder 11, without limitation. In this embodiment, six first positioning protrusions 111 are arranged in a circumferential array along the cylinder 11. The outer peripheral wall of the filter element 20 abuts against the six first positioning protrusions 111, achieving the installation and positioning of the filter element 20. This also ensures that the distance between the outer peripheral wall of the filter element 20 and the inner peripheral wall of the cylinder 11 is consistent at each position, guaranteeing the water output effect of the filter element 20.

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

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

[0126] Furthermore, the first channel 131 and the second channel 133 can be through holes opened in the cylinder 11 or strip grooves. There is no limitation on them 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, the bottom of the cylinder 11 is provided with a plurality of second positioning protrusions 112 facing the opening of the cylinder 11. The plurality of second positioning protrusions 112 are arranged circumferentially along the outlet 102. The filter element 20 abuts against the second positioning protrusions 112, and a second channel 133 is formed between two adjacent second positioning protrusions 112.

[0128] Optionally, the second positioning protrusion 112 is used to support the end of the filter element 20 facing the 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, allowing 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 circumferentially along the outlet 102. The specific number is not limited here, as long as it can play the role of supporting the filter element 20. It is understood that the more second positioning protrusions 112 there are, the better the support effect on the core and the smaller the area of ​​the second channel 133. 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 arranged in an array at the bottom of the cylinder 11 to support the filter element 20 housed inside the cylinder 11, so that a gap is formed between the filter element 20 and the bottom of the cylinder 11. This gap is the second channel 133, which is used to communicate with the outer cavity 132. Compared with opening holes or grooves in the cylinder 11 to connect the outer cavity 132 with the outlet 102, the structure of the cylinder 11 is simpler and the conductivity is better.

[0130] Furthermore, the second positioning protrusion 112 is connected to the first positioning protrusion 111, which facilitates the processing of the cylinder 11 and increases the strength of the second positioning protrusion 112. In this embodiment, the bottom end of the filter element 20 is recessed, and correspondingly, the second positioning protrusion 112 is configured as a trapezoidal rib with its width gradually increasing from the inlet 101 to the outlet 102 to increase the contact area between the second positioning protrusion 112 and the filter element 20 and improve its support effect.

[0131] In one embodiment, the cover 12 includes a cover plate 121. The cover plate 121 has a first side plate 122 and a second side plate 123 protruding towards the cylinder 11. The first side plate 122 and the second side plate 123 are arranged radially spaced along the cover plate 121, and a limiting groove 124 for the cylinder 11 to be inserted 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 is closer to the water inlet 101 than the first side plate 122.

[0132] Optionally, the cover plate 121 is plate-shaped and is placed over the open end of the cylinder 11 to confine the filter element 20 within the filter housing 10. Taking the cover plate 121 installed at the upper end of the cylinder 11 as an example, the cover plate 121 has a first side plate 122 and a second side plate 123 protruding downwards. The first side plate 122 is farther from the inlet 101 than the second side plate 123. The inner wall of the first side plate 122 contacts the outer peripheral wall of the cylinder 11, thus preventing relative displacement between the cover plate 12 and the cylinder 11 along the circumference. The distance between the first side plate 122 and the second side plate 123 matches the wall thickness of the cylinder 11. With the cover plate 121 covering the open end of the cylinder 11, the upper part of the cylinder 11 is inserted into the limiting groove 124 formed between the first side plate 122 and the second side plate 123, further increasing the connection strength between the cover plate 12 and the cylinder 11 and providing a certain degree of sealing.

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

[0134] Optionally, in this embodiment, the cover 12 and the cylinder 11 are threaded together. Compared to welding the cover 12 to the cylinder 11, when the filter element 20 is clogged, the cover 12 can be opened to replace the filter element 20 separately, reducing the difficulty of disassembling and assembling the filter element 20 and saving 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 cylinder 11 is provided with an external thread 113 that mates with the internal thread. This allows the cover 12 to be threaded onto the cylinder 11, reducing the difficulty of installing the filter element 20.

[0135] In one embodiment, reference is made to Figure 4 and Figure 5 The cover plate 121 has a plurality of third positioning protrusions 125 protruding towards the cylinder 11, and the plurality of third positioning protrusions 125 are arranged at intervals along the circumference of the cover plate 12; when the cover plate 12 is placed on the cylinder 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 against the filter element 20 to prevent axial displacement of the filter element 20 within the filter housing 10. The third positioning protrusion 125 can be 2, 3, 4, 6, 8, or more arranged circumferentially along the outlet 102; the specific number is not limited here, as long as it serves to position the filter element 20. Due to the presence of the third positioning protrusion 125, a certain gap exists between the filter element 20 and the cover plate 121, which is the first channel 131. Thus, when the filter element 20 becomes completely clogged due to excessive filtration of impurities, the condensate entering the filter element device 1 from the inlet 101 will sequentially pass through the first channel 131, the outer cavity 132, and the second channel 133, and be discharged from the outlet 102, preventing pipe blockage.

[0137] In this embodiment, the third positioning protrusion 125 can be six in a circumferential array along the outlet 102. They can be square protrusions. The end of the third positioning protrusion 125 away from the outlet 102 is connected to the second side plate 123. This increases the structural strength of the third positioning protrusion 125. The size of the third positioning protrusion 125 can be set 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 get blocked.

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

[0139] Optionally, the sealing element 30 can be a sealing ring made of corrosion-resistant fluororubber. The sealing ring is installed between the first side plate 122 and the cylinder 11 to provide a radial seal to the cylinder 11, avoiding sealing problems caused by incomplete screw threading and ensuring the sealing reliability of the filter element device 1. Specifically, the upper end of the external thread section of the cylinder 11 has an annular groove. The sealing ring is fitted into the annular groove. When the cover 12 and the cylinder 11 are connected by threads, the sealing ring provides a radial seal to the cylinder 11, avoiding sealing problems caused by incomplete screw threading and ensuring the sealing reliability of the filter element device 1.

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

[0141] It should be noted that, because water vapor in medium-temperature flue gas condenses into liquid condensate while releasing latent heat, and because CO2 and NO in the flue gas... XAcidic gases dissolve in condensate, making it corrosive. Therefore, in this embodiment, a filter chamber 201 is formed inside the filter element 20 for placing filter media, which is a neutral filter media. Thus, when condensate flows into the filter element 20, the filter media placed in the filter chamber 201 can neutralize the acidic condensate. This ensures that the condensate discharged from the outlet 102 of the filter element device 1 is treated neutral water, which will not corrode the pipes and can be directly recycled.

[0142] In one embodiment, the filter element 20 includes a first filter cover 21 and a filter cylinder 222. The filter body 22 is provided with an installation groove 221 with one end open. The first filter cover 21 is disposed 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 configured. This makes it easier for the user to fill the filter media into the filter chamber 201. When the filter element 20 is clogged, the filter media can be replaced and the filter element 20 can be cleaned separately without replacing the entire filter element 20, thus reducing the cost of use.

[0144] Specifically, the filter cylinder 222 is a cylindrical shape with one open end, and the first filter screen cover 21 is a circular filter screen. A side plate protrudes from the periphery of the first filter screen towards the filter cylinder 222. When the first filter screen cover 21 is placed over the open end of the filter cylinder 222, it closes the mounting groove 221 to prevent the filter material installed in the filter chamber 201 from falling out. The inner peripheral wall of the side plate abuts against the outer peripheral wall of the filter cylinder 222, restricting the relative displacement of the first filter screen cover 21 and the filter cylinder 222 along their circumference. In this embodiment, 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 12 is placed on the filter housing 10, the cover 12 abuts against the first filter screen cover 21 to restrict the first filter screen cover 21 and the filter cylinder 222 from moving away from each other axially.

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

[0146] It is understandable that when the filter body 22 is a cylindrical design with one open end, its manufacturing process is more difficult and it is not convenient for the overall production of the filter element device 1. Therefore, in this embodiment, the filter body 22 is composed of two parts: a filter cylinder 222 and a second filter cover 223. The filter cylinder 222 is cylindrical, and the second filter cover 223 is fixedly installed on the end opening of the filter cylinder 222 away from the first filter cover 21 by welding or other means to facilitate the filling of filter media.

[0147] It should be noted that in this embodiment, the first filter cover 21 is configured with a mesh structure, which facilitates the entry of condensate into the filter element 20. Correspondingly, the second filter cover 223 is configured with a mesh structure, which facilitates the timely discharge of neutralized water from the filter element 20, reduces flow resistance, avoids the risk of clogging caused by clogging of the filter mesh in a single location, and can promptly guide the condensate neutralized by the filter element 20 out.

[0148] Furthermore, the filter cartridge 222, as the main support structure of the filter media, also has multiple mesh openings on its surface, connecting the bypass branch 13 to the filter chamber 201, ensuring that the neutralized condensate can be discharged from the mesh openings, and also blocking and filtering impurities.

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

[0150] In this embodiment, both the first filter cover 21 and the second filter cover 223 are recessed from the inlet 101 to the outlet 102. Taking an example where the inlet 101 is located above the filter housing 10 and the outlet 102 is located below the filter housing 10, the first filter cover 21 and the second filter cover 223 are both designed as downwardly recessed arc shapes. Thus, when the first filter cover 21 is recessed downwards, it helps to concentrate the condensate entering from the inlet 101, ensuring that the condensate flows through the filter cartridge 222 and achieves sufficient neutralization. When the second filter cover 223 is designed as a downwardly recessed arc surface, more filter material can be packed into the filter element 20 without changing the height of the filter cartridge 222.

[0151] The present invention also proposes a filtration device, which includes a filter element device 1. The specific structure of the filter element device 1 is as described in the above embodiments. Since this filtration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The filtration device also includes filter media, which is installed inside the filter element 20 to improve its filtration effect.

[0152] Furthermore, the filter media consists of neutralizing agent particles, used to neutralize the acidity of the condensate, thereby enabling the filter device to filter and neutralize the condensate. The condensate can be recycled and will not corrode the pipes.

[0153] This invention also proposes a gas water heater, which is a condensing gas water heater, including a filter element device 1. The specific structure of the filter element device 1 is as described in the above embodiments. Since this gas water heater adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. Alternatively, the gas water heater includes a filtration device, the specific structure of which is as described in the above embodiments. Since this gas water heater adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

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

[0155] In another embodiment, a bypass branch 13 is provided between the filter element 20 and the filter housing 10, connecting the inlet 101 and the outlet 102. When external liquid enters the filter device 1, it is filtered through the main filter channel and flows out from the outlet 102. When the filter element 20 is blocked, the condensate entering the filter device 1 from the inlet 101 can flow out from the outlet 102 through the bypass branch 13. This can prevent the condensate from flowing back into the condensate drain pipe or even overflowing from the flue pipe, ensuring the normal operation of the machine and preventing the neutralizing agent in the condensate of the present invention from failing to meet the requirement of no replacement within a service life of more than 10 years due to equipment factors.

[0156] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for preparing a condensate neutralizer, characterized in that, Includes the following steps: Magnesium-containing compounds are mixed with flux and water to form a wet powder. The wet powder is granulated to form granules; The granular material is dried, melted and calcined, cooled and pulverized to obtain a granular condensate neutralizer; The magnesium-containing compound includes at least one of magnesium carbonate, magnesium hydroxide, magnesium sulfate, magnesium nitrate, and magnesium chloride. The melting and calcination temperature is 1200℃-1800℃; The flux includes at least one of boron oxide, calcium oxide, and phosphorus oxide; The melting and calcination time is 2h-4h.

2. The method for preparing the condensate neutralizer according to claim 1, characterized in that, The magnesium-containing compound is magnesium carbonate.

3. The method for preparing the condensate neutralizer according to claim 2, characterized in that, During the melting and calcination process, the reaction process of the magnesium carbonate is as follows: MgCO3→MgO+CO2↑.

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

5. The method for preparing the condensate neutralizer according to claim 1, characterized in that, The drying temperature is 120℃-180℃; and / or the drying time is 2h-4h.

6. The method for preparing the condensate neutralizer according to claim 1, characterized in that, The particle size range of the granules is 1mm-5mm.

7. The method for preparing the condensate neutralizer according to claim 1, characterized in that, The granules are spherical.

8. The method for preparing the condensate neutralizer according to claim 1, characterized in that, Based on a total mass of 100% of the magnesium-containing compound, the amount of 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%.

9. A condensate neutralizer prepared by the preparation method according to any one of claims 1 to 8.

10. The condensate neutralizer according to claim 9, characterized in that, The magnesium oxide content in the neutralizing agent in the condensate is above 95%.

11. The condensate neutralizer according to claim 9, characterized in that, The particle size range of the neutralizing agent in the condensate is 1mm-5mm.

12. The application of the condensate neutralizer according to any one of claims 9 to 11 in a condensing gas water heater.

13. The application of the condensate neutralizer according to claim 12 in a condensing gas water heater, characterized in that, 100g-150g of the condensate neutralizer can meet the neutralization requirements of condensate water in condensing gas water heaters with a capacity of less than 18L for more than 10 years of use.

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