Urea hydrolysis drainage system and method for eliminating white smoke through heat recovery

Abstract

The invention discloses a urea hydrolysis drainage system and method for eliminating white smoke through heat recovery. The urea hydrolysis drainage system comprises a urea hydrolysis reactor, a drainage tank and a heat recovery device. A drainage outlet of the urea hydrolysis reactor is communicated with an inlet of the drainage main pipe, an outlet of the drainage main pipe is communicated with an inlet of the heat recovery device, an outlet of the heat recovery device is communicated with the drainage tank, and the system and the method recover high-temperature drainage heat and eliminate white smoke at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas denitration in thermal power plants, and relates to a urea hydrolysis and drainage system and method for heat recovery and white smoke elimination. Background Art

[0002] According to relevant policy requirements, it is imperative to use urea to replace liquid ammonia as a denitrification reducing agent to eliminate major hazardous sources in ammonia areas. Urea hydrolysis to produce ammonia has been widely used as a mature, reliable, and low-energy ammonia production process.

[0003] The process of producing ammonia by urea hydrolysis generally uses steam as a heat source. The hydrolysis reaction and system heating require a large amount of steam, which will produce a large amount of high-temperature hydrophobic water. The hydrophobic water is collected in the hydrophobic water tank through pipes and used to prepare urea solution. The excess hydrophobic water is discharged to a designated location. The hydrophobic water temperature is relatively high, generally around 95°C. After entering the hydrophobic water tank, a large amount of water vapor (white smoke) will be generated, which will have a visual impact.

[0004] Publication No. CN210612932U provides a flue gas spray heat exchange condensation and waste heat recovery white smoke elimination device, specifically, comprising a tower body and an absorption heat pump, a circulating water pool is arranged at the bottom of the tower body, an atomizing spray layer is arranged in the middle of the tower body, a heat pipe heater is arranged at the top of the tower body, and the heat pipe heater is connected to the expansion tank and the water pump through a heat medium water pipe; the circulating water pool is connected to the atomizing spray layer through a circulating pipe after passing through the circulating pump, and a low-pressure steam inlet and a condensed water outlet are also arranged on one side of the absorption heat pump, the circulating pipe releases heat through the absorption heat pump, and the heat medium water pipe absorbs heat through the absorption heat pump; a wet flue gas inlet is arranged on one side of the lower middle part of the tower body, a flue gas discharge port is arranged on the top of the tower body, a demister and a packing layer are also arranged in the middle of the tower body, and the atomizing spray layer is located between the demister and the packing layer. The white smoke elimination device of the present application directly contacts the flue gas after desulfurization with the low-temperature spray water therein for heat exchange and condensation, and the temperature is reduced to below the dew point. The water vapor in the flue gas is condensed into condensed water and releases a large amount of latent heat. The condensed flue gas is heated by a heat pipe heat exchanger to increase the superheat of the flue gas to increase the lifting force of the flue gas emission and the diffusion capacity in the environment, eliminate white smoke, and perform deep desulfurization and dust removal on the flue gas to further reduce the emission of flue gas pollutants. The present application can simultaneously realize the recovery of flue gas waste heat, the recovery of condensed water and the desulfurization of flue gas, and perform deep desulfurization and dust removal on the flue gas to further reduce the emission of flue gas pollutants and solve the problem of flue gas corrosion on subsequent equipment and chimneys.

[0005] At present, some urea hydrolysis drainage systems use desalted water to cool down to eliminate white smoke, but this method will waste a lot of desalted water, and the heat of high-temperature drainage is also lost. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a urea hydrolysis and hydrophobic system and method for heat recovery and white smoke elimination, which recovers high-temperature hydrophobic heat and eliminates white smoke at the same time.

[0007] To achieve the above object, the present invention discloses a urea hydrolysis and drainage system for heat recovery and white smoke elimination, comprising a urea hydrolysis reactor, a drainage tank and a heat recovery device;

[0008] The drain outlet of the urea hydrolysis reactor is connected to the inlet of the drain main pipe, the outlet of the drain main pipe is connected to the inlet of the heat recovery device, and the outlet of the heat recovery device is connected to the drain tank.

[0009] The further improvement of the urea hydrolysis and drainage system for heat recovery and white smoke elimination of the present invention is:

[0010] Furthermore, the outlet of the heat recovery device is connected to the drain tank via a drain recovery pipe.

[0011] Further, the heat recovery device includes a urea dissolution tank;

[0012] The outlet of the hydrophobic main pipe is communicated with the inlet of the urea dissolving tank heating coil in the urea dissolving tank, and the outlet of the urea dissolving tank heating coil in the urea dissolving tank is communicated with the inlet of the hydrophobic recovery pipe.

[0013] Further, the heat recovery device includes a urea storage tank;

[0014] The outlet of the hydrophobic main pipe is communicated with the inlet of the urea storage tank heating coil in the urea storage tank, and the outlet of the urea storage tank heating coil in the urea storage tank is communicated with the inlet of the hydrophobic recovery pipe.

[0015] Further, the heat recovery device includes a urea dissolution tank and a urea storage tank;

[0016] The outlet of the hydrophobic main pipe is divided into two paths, one of which is connected to the inlet of the urea dissolution tank heating coil in the urea dissolution tank, and the other is connected to the inlet of the urea storage tank heating coil in the urea storage tank. The outlet of the urea dissolution tank heating coil in the urea dissolution tank is connected to the inlet of the hydrophobic recovery pipe, and the outlet of the urea storage tank heating coil in the urea storage tank is connected to the inlet of the hydrophobic recovery pipe.

[0017] Furthermore, it also includes a heating system, and the outlet of the heating system is connected to the drain main pipe through a heating drain pipe.

[0018] The invention discloses a urea hydrolysis and hydrophobic method for heat recovery and white smoke elimination, comprising the following steps:

[0019] The high-temperature hydrophobic gas output from the urea hydrolysis reactor enters the heat recovery device to release heat to reduce the hydrophobic temperature, and then enters the hydrophobic tank.

[0020] The further improvement of the urea hydrolysis and hydrophobic method for heat recovery and white smoke elimination of the present invention is:

[0021] Further, the heat recovery device includes a urea dissolution tank;

[0022] The outlet of the hydrophobic main pipe is communicated with the inlet of the urea dissolving tank heating coil in the urea dissolving tank, and the outlet of the urea dissolving tank heating coil in the urea dissolving tank is communicated with the inlet of the hydrophobic recovery pipe.

[0023] Further, the heat recovery device includes a urea storage tank;

[0024] The outlet of the hydrophobic main pipe is communicated with the inlet of the urea storage tank heating coil in the urea storage tank, and the outlet of the urea storage tank heating coil in the urea storage tank is communicated with the inlet of the hydrophobic recovery pipe.

[0025] Further, the heat recovery device includes a urea dissolution tank and a urea storage tank;

[0026] The outlet of the hydrophobic main pipe is divided into two paths, one of which is connected to the inlet of the urea dissolution tank heating coil in the urea dissolution tank, and the other is connected to the inlet of the urea storage tank heating coil in the urea storage tank. The outlet of the urea dissolution tank heating coil in the urea dissolution tank is connected to the inlet of the hydrophobic recovery pipe, and the outlet of the urea storage tank heating coil in the urea storage tank is connected to the inlet of the hydrophobic recovery pipe.

[0027] The present invention has the following beneficial effects:

[0028] In the specific operation of the urea hydrolysis drain system and method for eliminating white smoke by heat recovery described in the present invention, the high-temperature drain output by the urea hydrolysis reactor enters the heat recovery device to release heat to reduce the drain temperature, and then enters the drain tank. The heat of the high-temperature drain is recovered by the heat recovery device, and the drain temperature is reduced at the same time, so as to achieve the recovery of the heat of the high-temperature drain and the elimination of white smoke at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 It is a schematic diagram of the system of the present invention;

[0031] Among them, 1 is a urea hydrolysis reactor, 2 is a urea dissolution tank, 3 is a urea storage tank, 4 is a drain tank, 5 is a heated drain pipe, 6 is a drain main pipe, 7 is a urea dissolution tank heating coil, 8 is a urea storage tank heating coil, and 9 is a drain recovery pipe. DETAILED DESCRIPTION

[0032] 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 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.

[0033] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0034] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0035] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0036] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0037] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0040] As is known, the urea hydrolysis reactor is a key equipment, which is mainly used to hydrolyze the urea solution under specific conditions to generate ammonia and carbon dioxide. The following is a detailed introduction to the urea hydrolysis reactor: The working principle of the urea hydrolysis reactor is based on the chemical process of urea reacting with water under the action of acid, alkali or enzyme (acid and alkali need to be heated) to generate ammonia and carbon dioxide. In industrial applications, catalysts are usually used to accelerate this reaction to improve production efficiency and product quality. The urea hydrolysis reactor is usually composed of a reactor body, a heating system, a catalyst system, a pressure control system, a temperature control system and other parts. The reactor body is usually made of corrosion-resistant and high-temperature resistant materials, such as 316L stainless steel, to ensure the stability and safety of the equipment during the reaction. The operating conditions of the urea hydrolysis reactor include reaction temperature, reaction pressure, urea solution concentration, and the type and amount of catalyst. Generally speaking, the reaction temperature is controlled between 130-160°C, the reaction pressure is about 0.4-0.6MPa, and the urea solution concentration can reach 40-60%. The type and amount of the catalyst are determined according to the specific reaction conditions and process requirements.

[0041] In scenarios involving urea hydrolysis or urea application, eliminating white smoke usually refers to reducing or eliminating white smoke produced by urea hydrolysis or the reaction of urea with nitrogen oxides in exhaust gas. Here are some possible solutions: Optimizing hydrolysis conditions for eliminating white smoke during urea hydrolysis: Use appropriate heating methods, such as slow heating with a thermostatic heating plate, to avoid generating a large amount of white smoke before the urea is completely hydrolyzed. Control the hydrolysis temperature and time to ensure that the urea is completely hydrolyzed and does not decompose at high temperatures to produce ammonia and other nitrogen losses. Choose a suitable catalyst: Using an efficient catalyst can accelerate the urea hydrolysis reaction and improve the reaction efficiency, thereby reducing the generation of white smoke. Elimination of white smoke during urea denitration, accurately controlling the urea injection amount: During the flue gas denitration process, accurately controlling the urea injection amount can ensure that it fully reacts with nitrogen oxides in the exhaust gas, reducing the emission of unreacted urea and ammonia, thereby reducing the generation of white smoke. Optimize denitration process: Using advanced denitration processes, such as SNCR (selective non-catalytic reduction) or SCR (selective catalytic reduction), can improve denitration efficiency and reduce white smoke emissions. For the SNCR process, the denitration effect can be optimized by adjusting parameters such as the concentration of urea solution, injection position and injection speed. Strengthen equipment maintenance: Regularly check and maintain urea injection systems, catalytic converters and other equipment to ensure their normal operation and avoid white smoke emissions caused by equipment failure. Add tail gas treatment facilities: Add tail gas treatment facilities such as wet dust collectors and bag dust collectors at the tail of urea hydrolysis or denitration systems to further remove particulate matter and gaseous pollutants in the tail gas and reduce white smoke emissions. Improve environmental awareness: Strengthen the publicity and enforcement of environmental protection laws and regulations, improve the environmental awareness of enterprises, encourage enterprises to adopt more environmentally friendly production processes and equipment, and reduce pollutant emissions. In summary, eliminating white smoke in the process of urea hydrolysis or denitration requires comprehensive consideration of hydrolysis conditions, catalyst selection, urea injection amount, denitration process, equipment maintenance and tail gas treatment. By taking a series of measures, the emission of white smoke can be effectively reduced and the level of environmental protection can be improved.

[0042] Embodiment 1

[0043] The urea hydrolysis and drain system for heat recovery and white smoke elimination of the present invention comprises a urea hydrolysis reactor 1, a drain tank 4 and a heat recovery device; the drain outlet of the urea hydrolysis reactor 1 is connected to the inlet of the drain main pipe 6, the outlet of the drain main pipe 6 is connected to the inlet of the heat recovery device, and the outlet of the heat recovery device is connected to the drain tank 4.

[0044] Accordingly, the urea hydrolysis and hydrophobic method for heat recovery and white smoke elimination of the present invention comprises the following steps:

[0045] The high-temperature hydrophobic gas outputted from the urea hydrolysis reactor 1 enters into a heat recovery device to release heat to reduce the temperature of the hydrophobic gas, and then enters into a hydrophobic tank 4 .

[0046] Embodiment 2

[0047] The urea hydrolysis and drain system for heat recovery and white smoke elimination described in this embodiment includes a urea hydrolysis reactor 1, a drain tank 4 and a heat recovery device; the drain outlet of the urea hydrolysis reactor 1 is connected to the inlet of the drain main pipe 6, the outlet of the drain main pipe 6 is connected to the inlet of the heat recovery device, and the outlet of the heat recovery device is connected to the drain tank 4.

[0048] The heat recovery device includes a urea dissolving tank 2; the outlet of the hydrophobic main pipe 6 is connected to the inlet of the urea dissolving tank heating coil 7 in the urea dissolving tank 2, and the outlet of the urea dissolving tank heating coil 7 in the urea dissolving tank 2 is connected to the inlet of the hydrophobic recovery pipe 9.

[0049] During operation, the hydrophobic gas generated by the heating system is collected into the hydrophobic main pipe 6 through the heating hydrophobic pipe 5 and the hydrophobic gas generated by the urea hydrolysis reactor 1. The temperature of the hydrophobic gas in the hydrophobic main pipe 6 is about 95°C. When the hydrophobic gas is directly discharged into the hydrophobic tank 4, a large amount of white smoke will be generated.

[0050] Embodiment 3

[0051] The urea hydrolysis and drain system for heat recovery and white smoke elimination described in this embodiment includes a urea hydrolysis reactor 1, a drain tank 4 and a heat recovery device; the drain outlet of the urea hydrolysis reactor 1 is connected to the inlet of the drain main pipe 6, the outlet of the drain main pipe 6 is connected to the inlet of the heat recovery device, and the outlet of the heat recovery device is connected to the drain tank 4.

[0052] The heat recovery device includes a urea storage tank 3; the outlet of the hydrophobic main pipe 6 is connected to the inlet of the urea storage tank heating coil 8 in the urea storage tank 3, and the outlet of the urea storage tank heating coil 8 in the urea storage tank 3 is connected to the inlet of the hydrophobic recovery pipe 9.

[0053] Embodiment 4

[0054] refer to Figure 1 The urea hydrolysis and drainage system for heat recovery and white smoke elimination of the present invention comprises a urea hydrolysis reactor 1, a urea dissolving tank 2, a urea storage tank 3, a drainage tank 4, a heating drainage pipeline 5, a drainage main pipe 6, a urea dissolving tank heating coil 7, a urea storage tank heating coil 8 and a drainage recovery pipe 9;

[0055] The hydrophobic outlet of the urea hydrolysis reactor 1 is connected to the inlet of the hydrophobic mother pipe 6, and the outlet of the hydrophobic mother pipe 6 is divided into two paths, one of which is connected to the inlet of the urea dissolution tank heating coil 7 in the urea dissolution tank 2, and the other is connected to the inlet of the urea storage tank heating coil 8 in the urea storage tank 3. The outlet of the urea dissolution tank heating coil 7 in the urea dissolution tank 2 is connected to the inlet of the hydrophobic recovery pipe 9, the outlet of the urea storage tank heating coil 8 in the urea storage tank 3 is connected to the inlet of the hydrophobic recovery pipe 9, and the outlet of the hydrophobic recovery pipe 9 is connected to the inlet of the hydrophobic tank 4.

[0056] In this embodiment, a heating system is also included, and the outlet of the heating system is connected to the drain main pipe 6 through the heating drain pipe 5.

[0057] refer to Figure 1 The urea hydrolysis and hydrophobic method for heat recovery and white smoke elimination comprises the following steps:

[0058] The hydrophobicity generated by the heating system is collected into the hydrophobic main pipe 6 through the heating hydrophobic pipe 5 and the hydrophobicity generated by the urea hydrolysis reactor 1. The temperature of the hydrophobicity in the hydrophobic main pipe 6 is about 95°C. When the hydrophobicity is directly discharged into the hydrophobic tank 4, a large amount of white smoke will be generated.

[0059] In order to avoid the generation of a large amount of smoke, the present invention is provided with a urea dissolving tank 2 and a urea storage tank 3, and the hydrophobic output from the hydrophobic mother pipe 6 is respectively sent to the urea dissolving tank heating coil 7 and the urea storage tank heating coil 8, and heat exchange and cooling are performed with the urea in the urea dissolving tank 2 and the urea storage tank 3. Among them, the urea dissolving tank 2 is used to prepare the urea solution, and the urea will absorb a lot of heat when it is dissolved, so it is necessary to set the urea dissolving tank heating coil 7 to heat the urea dissolving tank 2. The urea storage tank 3 is used to store the urea solution. Urea is easy to crystallize, and the temperature needs to be maintained at about 50°C. The urea storage tank heating coil 8 is used to provide heat for the urea storage tank 3.

[0060] The high-temperature hydrophobic gas enters the urea dissolving tank heating coil 7 and the urea storage tank heating coil 8 through the hydrophobic main pipe 6 for heat exchange. While heating the urea in the urea dissolving tank 2 and the urea storage tank 3, the hydrophobic temperature is reduced. Finally, the hydrophobic gas is discharged into the hydrophobic tank 4 through the hydrophobic recovery pipe 9. At this time, the low-temperature hydrophobic gas will not produce white smoke.

[0061] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0062] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0063] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A urea hydrolysis and drainage system for heat recovery and white smoke elimination, characterized in that: It comprises a urea hydrolysis reactor (1), a drain tank (4) and a heat recovery device; The drain outlet of the urea hydrolysis reactor (1) is connected to the inlet of the drain main pipe (6), the outlet of the drain main pipe (6) is connected to the inlet of the heat recovery device, and the outlet of the heat recovery device is connected to the drain tank (4).

2. The urea hydrolysis and drainage system for heat recovery and white smoke elimination according to claim 1 is characterized in that: The outlet of the heat recovery device is connected to the drain tank (4) via a drain recovery pipe (9).

3. The urea hydrolysis and drainage system for heat recovery and white smoke elimination according to claim 1 is characterized in that: The heat recovery device comprises a urea dissolving tank (2); The outlet of the hydrophobic main pipe (6) is connected to the inlet of the urea dissolving tank heating coil (7) in the urea dissolving tank (2), and the outlet of the urea dissolving tank heating coil (7) in the urea dissolving tank (2) is connected to the inlet of the hydrophobic recovery pipe (9).

4. The urea hydrolysis and drainage system for heat recovery and white smoke elimination according to claim 1, characterized in that: The heat recovery device comprises a urea storage tank (3); The outlet of the hydrophobic main pipe (6) is connected to the inlet of the urea storage tank heating coil (8) in the urea storage tank (3), and the outlet of the urea storage tank heating coil (8) in the urea storage tank (3) is connected to the inlet of the hydrophobic recovery pipe (9).

5. The urea hydrolysis and drainage system for heat recovery and white smoke elimination according to claim 1, characterized in that: The heat recovery device comprises a urea dissolving tank (2) and a urea storage tank (3); The outlet of the hydrophobic main pipe (6) is divided into two paths, one of which is connected to the inlet of the urea dissolving tank heating coil (7) in the urea dissolving tank (2), and the other is connected to the inlet of the urea storage tank heating coil (8) in the urea storage tank (3). The outlet of the urea dissolving tank heating coil (7) in the urea dissolving tank (2) is connected to the inlet of the hydrophobic recovery pipe (9), and the outlet of the urea storage tank heating coil (8) in the urea storage tank (3) is connected to the inlet of the hydrophobic recovery pipe (9).

6. The urea hydrolysis and drainage system for heat recovery and white smoke elimination according to claim 1, characterized in that: It also comprises a heat tracing system, the outlet of which is connected to the drain main pipe (6) via a heat tracing drain pipe (5).

7. A urea hydrolysis and hydrophobic method for heat recovery and white smoke elimination, characterized in that: The urea hydrolysis and drainage system for heat recovery and white smoke elimination according to claim 1 comprises the following steps: The high-temperature hydrophobic gas outputted from the urea hydrolysis reactor (1) enters a heat recovery device to release heat to reduce the hydrophobic gas temperature, and then enters a hydrophobic gas tank (4).

8. The urea hydrolysis and hydrophobic method for heat recovery and white smoke elimination according to claim 7, characterized in that: The heat recovery device comprises a urea dissolving tank (2); The outlet of the hydrophobic main pipe (6) is connected to the inlet of the urea dissolving tank heating coil (7) in the urea dissolving tank (2), and the outlet of the urea dissolving tank heating coil (7) in the urea dissolving tank (2) is connected to the inlet of the hydrophobic recovery pipe (9).

9. The urea hydrolysis and hydrophobic method for heat recovery and white smoke elimination according to claim 7, characterized in that: The heat recovery device comprises a urea storage tank (3); The outlet of the hydrophobic main pipe (6) is connected to the inlet of the urea storage tank heating coil (8) in the urea storage tank (3), and the outlet of the urea storage tank heating coil (8) in the urea storage tank (3) is connected to the inlet of the hydrophobic recovery pipe (9).

10. The urea hydrolysis and hydrophobic method for heat recovery and white smoke elimination according to claim 7, characterized in that: The heat recovery device comprises a urea dissolving tank (2) and a urea storage tank (3); The outlet of the hydrophobic main pipe (6) is divided into two paths, one of which is connected to the inlet of the urea dissolving tank heating coil (7) in the urea dissolving tank (2), and the other is connected to the inlet of the urea storage tank heating coil (8) in the urea storage tank (3). The outlet of the urea dissolving tank heating coil (7) in the urea dissolving tank (2) is connected to the inlet of the hydrophobic recovery pipe (9), and the outlet of the urea storage tank heating coil (8) in the urea storage tank (3) is connected to the inlet of the hydrophobic recovery pipe (9).

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