Annular steam pocket and vertical waste heat boiler

Abstract

The invention discloses an annular steam drum and a vertical waste heat boiler, which structurally comprise a vertically distributed boiler body, and a base, which is arranged in the boiler body from bottom to top and is used for supporting the weight of the boiler and is provided with a flue gas inlet; the evaporator comprises an evaporator cylinder and a vertically arranged threaded smoke tube arranged in the evaporator cylinder; the smoke outlet is communicated with the threaded smoke pipe, so that smoke flows out; the annular steam pocket is located on the upper portion of the evaporator, an upper pipe plate of the evaporator is communicated with an inner barrel of the annular steam pocket through an ascending pipe, the lower end of a barrel of the evaporator is communicated with a lower pipe plate of the annular steam pocket through a descending pipe, independent steel frame supporting is not needed, a second-stage steam-water separator is arranged in the annular steam pocket, and a steam outlet used for leading out steam is formed in the second-stage steam-water separator. Through the integrated structural design and the vertical layout, the obvious effects of being high in steam dryness, safe, reliable and stable and improving the waste heat recovery efficiency and the occupied space are achieved, and the device is particularly suitable for the industrial environment needing high-quality steam and limited in space.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, in particular to an annular steam drum and a vertical waste heat boiler. Background Art

[0002] Waste heat boilers (HRSGs) are commonly used to recover energy from high-temperature industrial exhaust gases and are widely used across various industrial sectors. When recovering high-temperature flue gases, HRSGs typically employ water-tube or shell-and-steam heat exchange structures. Shell-and-steam heat exchange structures are particularly popular in applications with low flue gas volumes and high sealing requirements. In the chemical industry, fire-tube HRSGs are recognized for their excellent sealing properties and are primarily available in horizontal and vertical configurations. However, horizontal configurations require a large floor space, so vertical HRSGs are often used to save space.

[0003] While vertical fire-tube waste heat boilers offer advantages, they also present some challenges. There are generally two types of vertical fire-tube boilers. One type features a steam drum supported by a separate steel frame, with the fire-tube evaporator connected to the drum via risers and downcomers. This structure typically requires on-site assembly, which not only occupies a large area but is also costly. The other type is a one-piece, quick-assembly structure, in which the fire-tube evaporator's upper tube plate is designed as a concave structure, with a surrounding raised portion serving as the steam space. However, this structure offers limited steam space and presents a serious problem of water carryover from the steam. Furthermore, the inner shell is directly exposed to the high-temperature flue gas, which can easily cause the inner shell wall to overheat. More critically, according to strict boiler safety regulations, the minimum safe water level for shell boilers should be 100mm above the highest fire level. However, the highest fire level for this concave structure is not clearly defined, and therefore, strictly speaking, does not meet the requirements of the boiler safety regulations.

[0004] Furthermore, existing traditional vertical fire-tube waste heat boilers also suffer from inadequate heat exchange efficiency. Specifically, the flow and distribution of the steam-water mixture within the boiler are uneven, with no clear riser and downcomer layout, or with risers and downcomers but unevenly arranged. This affects the boiler's heat exchange efficiency. These issues hinder the performance and energy recovery efficiency of the waste heat boiler.

[0005] In summary, the problems existing in the prior art mainly include:

[0006] 1. Traditional vertical bulk fire tube waste heat boilers occupy a large area and are costly, especially structures that require on-site assembly.

[0007] 2. The traditional quick-install "concave" structure vertical fire tube waste heat boiler has limited steam space and the problem of steam carrying water is serious.

[0008] 3. The vertical inner cylinder of the traditional quick-install "concave" structure is directly exposed to the erosion of high-temperature flue gas, which easily causes the wall temperature to overheat.

[0009] 4. The highest fire boundary line of the traditional quick-install "concave" vertical fire tube structure is unclear and does not meet the requirements of the boiler safety technical regulations.

[0010] 5. The traditional quick-install vertical fire tube structure causes uneven circulation and distribution of the steam-water mixture in the boiler, affecting the heat exchange effect.

[0011] In view of the deficiencies in the prior art, the present invention provides an annular steam drum and a vertical waste heat boiler, which solve the problems mentioned in the background technology.

[0012] Invention

[0013] In response to the shortcomings of the above-mentioned prior art, the applicant provides an annular steam drum and a vertical waste heat boiler with an integrated structural design and a vertical layout, which achieves a compact structure, high steam dryness, safe and stable operation, high heat exchange efficiency, and significant effects of reducing costs and space occupancy. It is particularly suitable for industrial environments that require high-quality steam and have limited space.

[0014] The technical solutions adopted in the present invention are as follows:

[0015] An annular steam drum comprising:

[0016] The annular drum assembly is composed of an annular drum upper tube plate, an annular drum outer cylinder, an annular drum inner cylinder and an annular drum lower tube plate to form a closed annular cavity;

[0017] There are multiple riser pipes that are connected to the inner cylinder of the annular steam drum at annular intervals;

[0018] Downcomers, which are multiple and distributed annularly at intervals on the lower tube plate of the annular steam drum;

[0019] A water inlet device, comprising a first annular structure disposed within the annular cylinder assembly, wherein a plurality of water inlet device outlets are provided at the lower end of the first annular structure, wherein the number of the water inlet device outlets corresponds to the number of the downpipes and the water inlet device outlets are located on the same vertical line as the downpipes;

[0020] The sewage discharge device includes a second annular structure placed in the annular cylinder assembly. The second annular structure is provided with a plurality of sewage discharge device suction pipes, and the number of the sewage discharge device suction pipes corresponds to the number of the riser pipes and the riser pipes are vertically arranged on the same vertical plane.

[0021] In one embodiment, an annular steam baffle is further included, which is arranged in the annular cylinder assembly and is on the same horizontal line as the riser connection port. Its cross-section is two L-shaped structures, and the openings of the two L-shaped structures are opposite to each other, forming a "J"-shaped steam channel for evenly distributing steam and reducing flow dead zones and vortices, thereby completing the initial separation of steam.

[0022] In one embodiment, the annular cylinder assembly is further connected to a water level gauge, a pressure gauge and a steam outlet, which are used to detect the water level height and internal pressure value in the annular steam drum and to export steam respectively.

[0023] In one embodiment, the first circular ring structure and the second circular ring structure are both provided with connection ports extending out of the annular steam drum, and the first circular ring structure is located at the lower end of the second circular ring structure, and the first circular ring structure and the second circular ring structure are both connected to the annular steam drum through a bracket.

[0024] In one embodiment, the annular structure of the sewage discharge device is located above the annular structure of the water inlet device, and the connection ports of the multiple sewage discharge device suction pipes and the multiple riser pipes correspond one to one and are on the same vertical plane.

[0025] A waste heat boiler comprising the annular steam drum according to any one of claims 1 to 5, further comprising a furnace body, and, disposed in the furnace body and arranged in sequence from bottom to top:

[0026] A base, the upper end of which is open, and a smoke inlet is provided on one side of the base;

[0027] The evaporator is arranged at the upper end of the base, and includes an evaporator barrel, an evaporator upper tube plate, an evaporator lower tube plate and a threaded smoke pipe. The threaded smoke pipe is vertically arranged at the axis of the evaporator barrel. The evaporator upper tube plate and the evaporator lower tube plate are respectively connected to the upper and lower ends of the evaporator barrel;

[0028] A flue gas outlet is provided at the middle of the upper end of the evaporator and is connected to the threaded flue pipe;

[0029] Wherein, a plurality of the downcomers are connected to the lower end of the side wall of the evaporator cylinder, and a plurality of connection holes communicating with the upcomers are opened on the upper tube plate of the evaporator.

[0030] In one embodiment, the upper and lower ends of the threaded smoke pipe respectively penetrate the corresponding evaporator upper tube plate and evaporator lower tube plate to achieve the circulation of smoke.

[0031] In one embodiment, at least one group of guide plates is further provided in the evaporator, each group of guide plates includes an annular guide plate and a tube hole guide plate, and the inner diameter of the annular guide plate is less than or equal to the outer diameter of the tube hole guide plate.

[0032] In one embodiment, a fixed sewage pipe is provided at the lower end of the evaporator cylinder.

[0033] In one embodiment, the annular steam drum is located at the top of the evaporator and is arranged outside the flue gas outlet. At the same time, the inner diameter of the annular steam drum is larger than the inner diameter of the evaporator, and the lower tube plate of the annular steam drum is higher than the upper tube plate of the evaporator.

[0034] The beneficial effects of the present invention are as follows:

[0035] The annular steam drum and vertical waste heat boiler in the present invention, through integrated structural design and vertical layout, achieve a compact structure, safe and stable operation, high steam dryness, and significantly improve waste heat recovery efficiency and space occupancy. They are particularly suitable for industrial environments that require high-quality steam and have limited space. This solution innovatively designs an annular steam drum, and constructs a complete steam-water circulation system through the connection between the riser and downcomer and the annular steam drum and the evaporator. This not only increases the steam space, effectively solves the problem of water in steam in traditional structures, but also achieves sufficient heat exchange between the flue gas and steam-water mixture in the boiler, significantly improving the heat exchange efficiency. At the same time, by clarifying the position of the highest fire boundary, that is, the upper tube plate of the evaporator, this solution ensures the safe and reliable operation of the boiler, meets the requirements of the boiler safety technical regulations, reduces safety risks, and makes the boiler more stable and reliable during operation.

[0036] The following beneficial effects are also included:

[0037] 1. The vertical fire-tube waste heat boiler utilizes an integrated structural design, significantly reducing installation time and costs compared to traditional structures that require on-site assembly. Its compact design significantly reduces footprint, making it particularly suitable for space-constrained industrial environments. This improvement not only reduces investment costs for enterprises but also improves production efficiency, making waste heat boiler deployment more flexible and convenient.

[0038] 2. This solution utilizes a vertical design, extending the boiler vertically and fully utilizing space, making it particularly suitable for space-constrained environments. This design addresses the space limitations of traditional boilers and improves their adaptability. Furthermore, the vertical structure facilitates the natural flow and heat exchange of flue gas and the steam-water mixture within the boiler, further improving the boiler's thermal efficiency.

[0039] 3. The new solution features an innovative annular steam drum design. This drum connects to the evaporator through risers and downcomers, creating a complete steam-water circulation system. This ensures more uniform circulation and more efficient heat exchange. This solution not only increases the steam volume, but also effectively addresses the limited steam volume and significant water carryover issues associated with traditional "concave" structures. Furthermore, the built-in annular steam baffle and fan-shaped steam-water separator enable secondary steam-water separation, further improving steam dryness. This improvement not only enhances steam quality but also makes heat recovery more efficient, bringing significant economic benefits to the company.

[0040] 5. By optimizing the boiler structure and in order to improve the boiler water quality, this solution sets up a continuous sewage discharge device in the annular steam drum. The sewage suction pipes of the continuous sewage discharge device are evenly distributed along the circumference of the annular steam drum, and the high-concentration boiler water in the boiler is discharged in a timely and even manner, ensuring good boiler water quality, reducing the risk of boiler scaling, improving the boiler's heat exchange efficiency and operational safety, and correspondingly improving the steam quality.

[0041] 6. By clearly defining the location of the highest fire limit, the new design ensures that the minimum safe water level for shell boilers is 100mm above the highest fire limit, thus strictly meeting the requirements of boiler safety technical regulations. By defining the evaporator upper tube sheet as the highest fire limit, the design basis for the minimum safe water level is clarified, ensuring safe and reliable operation of the boiler. This design addresses safety hazards associated with traditional boilers and improves operational stability. This improvement effectively enhances the safety of the waste heat boiler and reduces safety risks associated with structural issues. It also makes the boiler more stable and reliable during operation, reducing downtime and maintenance costs caused by safety issues. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is the main view of the patent of this invention.

[0043] Figure 2 for Figure 1 Cross-sectional view in the AA direction.

[0044] Figure 3 for Figure 1 Cross-sectional view along the BB direction.

[0045] Figure 4 for Figure 1 A partial enlarged view of part C in the middle.

[0046] Figure 5 for Figure 2 Cross-sectional view in the DD direction.

[0047] Figure 6 It is a cross-sectional view of the sector-shaped steam-water separator of the present invention.

[0048] 1. Annular drum; 11. Annular drum upper tube plate; 12. Annular drum outer shell; 13. Annular drum inner shell; 14. Annular drum lower tube plate; 15. Water inlet; 151. Water inlet outlet; 16. Sewage discharge device; 161. Sewage discharge device suction pipe; 17. Bracket; 18. Safety valve; 19. Sector-shaped steam-water separator; 110. Annular steam baffle; 111. Steam outlet; 112. Water Level meter; 113, pressure gauge; 2, flue gas outlet; 3, evaporator; 31, evaporator upper tube sheet; 32, evaporator cylinder; 33, evaporator lower tube sheet; 34, threaded smoke pipe; 35, guide plate; 351, circular guide plate; 352, tube hole guide plate; 36, inspection hole; 37, fixed sewage pipe; 4, base; 41, base cylinder; 42, flue gas inlet; 5, riser; 6, downcomer; 7, insulation layer. DETAILED DESCRIPTION

[0049] Example 1

[0050] This embodiment discloses an annular steam drum, which comprises an annular drum assembly. The annular drum assembly is enclosed by an annular drum upper tube plate 11, an annular drum outer tube 12, an annular drum inner tube 13 and an annular drum lower tube plate 14 to form a closed annular cavity.

[0051] The annular steam drum 1 is also provided with a water level gauge 112, a pressure gauge 113, a safety valve 18, and a steam outlet 111, wherein the water level gauge 112 is arranged on the side wall of the annular steam drum 1, and the pressure gauge 113, the safety valve 18 and the steam outlet 111 are arranged at the top of the annular steam drum 1; the water level height and the internal pressure value in the annular steam drum 1 are detected by the water level gauge 112 and the pressure gauge 113, and the explosion hazard is reduced by the safety valve 18.

[0052] like Figure 4As shown, in this embodiment, a plurality of risers 5 are distributed in an annular interval on the inner cylinder 13 of the annular steam drum, and an annular steam baffle 110 is provided in the inner cavity of the annular steam drum 1 at the connection port of the riser 5, that is, the connection port formed between the riser 5 and the annular cylinder assembly is on the same horizontal line as the annular steam baffle 110. The cross section of the annular steam baffle 110 is two L-shaped structures, and the openings of the two L-shaped structures are opposite, that is, the opening of the L-shaped structure at the lower end is upward, and the opening of the L-shaped structure at the upper end is downward. At the same time, the L-shaped structure at the lower end is closer to the inner cylinder 13 of the annular steam drum. The "J"-shaped steam channel formed by the two L-shaped structures, this structural design can ensure that the steam is evenly distributed when passing through the baffle, effectively reducing the flow dead zone and vortex, and completing the initial steam-water separation. At the same time, the L-shaped cross section greatly enhances the structural strength of the baffle, making it more stable and durable when facing the pressure and impact of steam, and effectively avoiding the risk of deformation or damage. Furthermore, the ring structure facilitates installation, allowing for easy docking and fastening with other components, while the L-shaped cross-section better adapts to the installation space and ensures a secure baffle installation. More importantly, this combined design requires precise engineering to ensure that the "J"-shaped passage between the baffle and the inner cylinder meets the flow rate requirements for steam-water separation. Finally, the ring design also fully utilizes limited space, optimizes spatial layout, and improves the overall performance and reliability of the equipment.

[0053] At the same time, if Figure 6 As shown, a fan-shaped steam-water separator 19 is provided on the inner side of the connection port of the annular steam drum 1 at the steam outlet 111. This structure better adapts to the internal space layout of the annular steam drum 1 and can realize the secondary separation of saturated water vapor. The saturated water vapor will leave the furnace body through the steam outlet 111.

[0054] In this embodiment, a plurality of downcomers 6 distributed in an annular manner are provided on the lower tube plate 14 of the annular steam drum, and cooperate with the riser 5 to realize a complete steam-water circulation between the annular steam drum 1 and the steamer 3 .

[0055] like Figure 5 As shown, the annular steam drum 1 in this embodiment is provided with a water inlet device 15, a continuous sewage discharge device 16 and a bracket 17. The water inlet device 15 and the sewage discharge device 16 are fixed in the annular steam drum 1 by the bracket 17, and the water inlet device 15 and the sewage discharge device 16 each include a circular ring structure placed in the annular steam drum 1, and a connecting port arranged on the circular ring structure and extending out of the annular steam drum 1. The circular ring structure is arranged concentrically with the annular steam drum 1. The water inlet device 15 includes a first circular ring structure and a first connecting port arranged on the first circular ring structure. The sewage discharge device 16 includes a second circular ring structure and a second connecting port arranged on the second circular ring structure.

[0056] like Figure 2As shown, the sewage discharge device 16 in this embodiment is located above the water inlet device 15, and a plurality of sewage discharge device suction pipes 161 distributed in an annular manner are provided on the circular ring structure of the sewage discharge device 16, and the plurality of sewage discharge device suction pipes 161 correspond one-to-one to the connection ports of the plurality of riser pipes 5 and are on the same vertical plane. The continuous sewage discharge device 16 can discharge the high-concentration boiler water in the boiler in a timely and uniform manner, ensure good water quality in the furnace, reduce the risk of boiler scaling, and improve heat exchange efficiency and steam quality.

[0057] The lower end of the circular structure of the water inlet device 15 is provided with multiple water inlet device outlets 151 distributed in an annular manner, and the number of the water inlet device outlets 151 corresponds to the number of the downcomers 6 and is on the same vertical line. Under the action of gravity and inertia, water is transported downward through the downcomer 6 to enhance the flow of water inside the downcomer 6.

[0058] Example 2

[0059] like Figures 1-6 As shown, this embodiment discloses a vertical waste heat boiler, which includes the annular steam drum 1 in Example 1, a vertically distributed furnace body, and a base 4, an evaporator 3 and a flue gas outlet 2 arranged in the furnace body and arranged in sequence from bottom to top.

[0060] like Figure 1 As shown, the evaporator 3 in this embodiment includes an evaporator barrel 32, an evaporator upper tube plate 31 connected to the upper and lower ends of the evaporator barrel 32, an evaporator lower tube plate 33, and a threaded smoke pipe 34 arranged at the axis of the evaporator barrel 32 and vertically arranged. The spiral structure of the threaded smoke pipe 34 can increase the contact area between the flue gas and water, thereby improving the heat exchange effect.

[0061] The evaporator barrel 32 in this embodiment is cylindrical. The downcomer 6 is led out from the annular steam drum 1 and is connected to the lower end of the side wall of the evaporator barrel 32. A plurality of connecting holes connected to the riser 5 are opened on the evaporator upper tube plate 31, so that the evaporator barrel 32 is connected with the riser 5, thereby realizing a complete circulation of water vapor from the annular steam drum 1-downcomer 6-evaporator 3-riser 5-annular steam drum 1, and allowing the evaporator 3 to heat the steam-water mixture and continuously transport it to the annular steam drum 1.

[0062] The upper and lower ends of the threaded smoke pipe 34 in this embodiment respectively penetrate the corresponding evaporator upper tube plate 31 and evaporator lower tube plate 33 to achieve the circulation of smoke, thereby allowing high-temperature smoke to pass through the evaporator 3 from the smoke pipe.

[0063] In another embodiment, Figure 3As shown, in order to accelerate the heat exchange effect, at least one set of guide plates 35 is further provided in the evaporator 3, each set of guide plates 35 includes a circular guide plate 351 and a tube hole guide plate 352, the circular guide plate 351 and the tube hole guide plate 352 are parallel to the evaporator upper tube plate 31 / evaporator lower tube plate 33, the circular guide plate 351 is connected to the evaporator cylinder 32, the tube hole guide plate 352 is nested on the threaded smoke pipe 34, and the inner diameter of the circular guide plate 351 is less than or equal to the inner diameter of the tube hole guide plate 352. The outer diameter of the annular guide plate 351 is larger than the tube hole guide plate 352 in the same group of guide plates 35, so that the water vapor first gathers toward the threaded smoke pipe 34 under the action of the annular guide plate 351, and then diffuses to the surroundings again, and repeats this process to improve the heating effect. Under the joint action of the annular guide plate 351 and the tube hole guide plate 352, the steam-water mixture can only flush the smoke pipe area horizontally, forming a double S-shaped flow direction, thereby strengthening heat exchange and improving heat exchange efficiency.

[0064] The riser 5 and the downcomer 6 in this embodiment not only play a connecting role, but also support the weight of the annular steam drum 1.

[0065] The smoke outlet 2 in this embodiment is located at the middle of the upper end of the evaporator barrel 32 and is connected to the threaded smoke pipe 34 to achieve the discharge of smoke.

[0066] In this embodiment, the annular steam drum 1 is located at the top of the evaporator 3 and outside the flue gas outlet 2. The inner diameter of the annular steam drum 1 is larger than that of the evaporator 3. The annular steam drum 1 is connected to the evaporator via an ascending pipe 5 and a descending pipe 6. A steam outlet is provided on the annular steam drum 1 for discharging steam. The lower annular steam drum sheet 13 of the annular steam drum 1 should be higher than the upper evaporator tube sheet 31 of the evaporator 3.

[0067] In this embodiment, a base 4 is provided at the lower end of the furnace body to improve the overall stability, and a flue gas inlet 41 and a base cylinder 42 are provided at the lower end of the side wall of the furnace body.

[0068] like Figure 1 As shown, the base 4 in this embodiment includes a flue gas inlet 41 and a base body 42. The upper portion of the base body 42 is connected to the evaporator lower tube plate 32 to support the main weight of the boiler. The interior of the base 4 is a flue gas passage that communicates with the threaded flue pipe 34 of the evaporator 3. The base 4 also requires high-temperature resistant casting material and insulation.

[0069] At the same time, the evaporator 3 in this embodiment is provided with an inspection hole 36 for easy maintenance, and a fixed sewage pipe 37 is also provided on the lower side of the evaporator 3.

[0070] In this embodiment, the evaporator upper tube sheet 31 is horizontally positioned, eliminating the traditional concave design. The evaporator 3's upper tube sheet 31 represents the highest fire boundary, as the flue gas is drawn out of the flue gas outlet 2 upon reaching this point. The minimum safe water level of the water level gauge 112 is based on this line. According to boiler safety regulations, the minimum water level must be 100 mm above the highest fire boundary and meet the 7-minute safe water level reduction time requirement. The annular drum body 12 can be adjusted in length as needed, easily meeting the safe water level reduction time and minimum steam volume requirements.

[0071] Moreover, the annular steam drum 1 does not come into contact with the flue gas, which greatly improves its safety.

[0072] In this embodiment, the riser 5 and the downcomer 6 are evenly distributed along the circumference, and the descending of the cold water and the ascending of the steam-water mixture are both in a uniform flow state, which can ensure stable and efficient heat exchange of the boiler.

[0073] At the same time, the riser 5 and the downcomer 6 not only play a connecting role, but also play a supporting role for the annular steam drum, and there is no need for a separate steel frame to support the annular steam drum.

[0074] Simultaneously, the steam generated within the evaporator 3 converges at the evaporator's upper tube sheet 31 and flows evenly along the multiple riser tubes 5 into the annular steam drum. After entering the annular steam drum 1, the boiler feed water flows along the water outlet 151 of the water inlet device 15, into the multiple corresponding downcomers 6, and evenly enters the bottom area of ​​the evaporator 3, effectively cooling the evaporator's lower tube sheet 33. It then evenly rises along the outer sides of the threaded smoke pipes 34 in a double S-shaped flow pattern for heat exchange, completing a complete steam-water cycle.

[0075] At the same time, an insulation layer 7 is provided for each component in the furnace body. Aluminum silicate is used for insulation according to the shape of the annular steam drum 1 and the evaporator 3. The downcomer is insulated separately according to the shape of the pipe, and general insulation materials are used in other places.

[0076] The working principle and usage process of this embodiment include:

[0077] like Figure 1 The solid arrow in the middle shows the flow direction of the high-temperature flue gas. The high-temperature flue gas enters the base 4 through the flue gas inlet 41 and is discharged through the threaded flue pipe 34 to the flue gas outlet 2 at the top.

[0078] like Figure 1 The dotted arrow in the middle shows the water flow direction. The feed water enters the annular steam drum 1 through the water supply device 15, enters the downcomer 6 through the water outlet 151 of the water supply device 15, and flushes horizontally along the outer side of the threaded smoke pipe 34, flows upward, and reaches the upper tube plate 31 of the evaporator.

[0079] At the same time, the flue gas and steam-water mixture will undergo uniform and sufficient heat exchange. After reaching the upper tube plate 31 of the evaporator, it will enter the annular steam drum along the riser 3 and produce saturated steam for external use after two steam-water separations.

[0080] Moreover, the annular drum 1 is not in contact with the flue gas and is completely in a heat-insulating state, which greatly improves safety. Due to the clear definition of the highest fire limit, the design of the lowest safe water level has a clear basis, which ensures the safe and reliable operation of the boiler.

[0081] It can be seen that the waste heat recovery boiler in this embodiment has the following beneficial effects:

[0082] The vertical waste heat boiler utilizes an integrated structural design, significantly reducing installation time and costs compared to traditional structures that require on-site assembly. Its compact design significantly reduces footprint, making it particularly suitable for space-constrained industrial environments. This improvement not only reduces investment costs for enterprises but also improves production efficiency, making waste heat boiler deployment more flexible and convenient.

[0083] This solution adopts a vertical design, allowing the boiler to extend vertically, fully utilizing space and making it particularly suitable for environments with limited space. This design addresses the space utilization limitations of traditional boilers and improves the boiler's adaptability. Furthermore, the vertical structure facilitates the natural flow and heat exchange of flue gas and steam-water mixture within the boiler, further improving the boiler's thermal efficiency.

[0084] In this solution, the boiler components are arranged sequentially from bottom to top. The annular steam drum is supported on the evaporator by risers and downcomers, eliminating the need for additional steel support. This creates a compact overall structure, simplifying installation and maintenance. This design not only saves space but also reduces installation and maintenance costs. It also improves boiler operating efficiency.

[0085] The new solution designed an annular steam drum to increase the steam space, effectively solving the problems of limited steam space and serious water content in the traditional "concave" structure. At the same time, the built-in annular steam baffle and fan-shaped steam-water separator perform two separations, further improving the steam dryness. This improvement not only improves the steam quality, but also makes the boiler's heat recovery more efficient, bringing significant economic benefits to the company.

[0086] At the same time, the continuous blowdown device design can promptly and evenly drain the highly concentrated boiler water, ensuring good water quality, reducing the risk of boiler scaling, and thus improving heat exchange efficiency and steam quality. This makes the boiler's heat recovery more efficient and brings significant economic benefits to the company.

[0087] By optimizing the boiler structure, the annular steam drum of this scheme can achieve uniform distribution of the riser and downcomer. The feed water enters the annular steam drum evenly and enters the evaporator evenly through multiple downcomers. The steam-water mixture flows and exchanges heat evenly in the evaporator and enters the annular steam drum evenly through the riser. In addition, a guide plate group is designed in the evaporator to form a double S-shaped flow heat exchange. The flue gas and water are fully in contact, the heat in the flue gas is fully released, the energy utilization rate is improved, the problem of low thermal efficiency of traditional boilers is solved, and it can operate reliably and stably for a long time.

[0088] The new plan ensures that the minimum safe water level of the shell boiler is 100mm higher than the highest fire limit by clarifying the position of the highest fire limit, thus strictly meeting the requirements of the boiler safety technical regulations.

[0089] By using the evaporator's upper tube sheet as the highest fire boundary, the design basis for the minimum safe water level is clarified, ensuring safe and reliable boiler operation. Furthermore, the annular steam drum is not heated. This design resolves the safety risks associated with traditional concave boilers and improves boiler operational stability. This improvement effectively enhances the safety of the waste heat boiler and reduces safety risks associated with structural issues. It also makes the boiler more stable and reliable during operation, reducing downtime and maintenance costs caused by safety issues.

[0090] In summary, the new vertical annular drum waste heat boiler has achieved significant improvements and beneficial results in terms of structure, steam quality, safety, and heat resistance. These improvements not only enhance boiler performance and efficiency but also bring significant economic benefits and long-term development advantages to the company.

[0091] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. An annular steam drum, characterized in that: include: The annular drum assembly is composed of an annular drum upper tube plate, an annular drum outer drum, an annular drum inner drum and an annular drum lower tube plate to form a closed annular cavity; There are multiple riser pipes which are connected to the inner cylinder of the annular steam drum at annular intervals; Downcomers, which are multiple and distributed on the lower tube plate of the annular drum at annular intervals; A water inlet device, comprising a first circular ring structure disposed in the annular cylinder assembly, wherein a plurality of water inlet device outlets are disposed at the lower end of the first circular ring structure, and the number of the water inlet device outlets corresponds to the number of the downcomers and is located on the same vertical line as the downcomers; The sewage discharge device comprises a second annular structure placed in the annular cylinder assembly, on which a plurality of sewage discharge device suction pipes are arranged, and the number of the sewage discharge device suction pipes corresponds to that of the riser pipes, and the suction pipes are vertically arranged on the same vertical plane as the riser pipes.

2. The annular steam drum according to claim 1, characterized in that: It also includes an annular steam baffle, which is arranged in the annular cylinder assembly and is on the same horizontal line as the riser connection port. Its cross-section is two L-shaped structures, and the openings of the two L-shaped structures are opposite to each other, forming a "J"-shaped steam channel for evenly distributing the steam flow rate, reducing flow dead zones and vortices, and completing the initial separation of steam.

3. The annular steam drum according to claim 1, characterized in that: The annular cylinder assembly is also connected with a water level gauge, a pressure gauge and a steam outlet, which are used to detect the water level height and internal pressure value in the annular steam drum and to export steam respectively.

4. The annular steam drum according to claim 1, characterized in that: The first and second circular ring structures are both provided with connection ports extending out of the annular steam drum, and the first circular ring structure is located at the lower end of the second circular ring structure. The first and second circular ring structures are both connected to the annular steam drum via a bracket.

5. The annular steam drum according to claim 1, characterized in that: The annular structure of the sewage discharge device is located above the annular structure of the water inlet device, and the connection ports of the plurality of sewage discharge device suction pipes and the plurality of riser pipes correspond one to one and are located on the same vertical plane.

6. A vertical waste heat boiler, comprising the annular steam drum according to any one of claims 1 to 5, characterized in that: It also includes a furnace body, and the following components, which are arranged in the furnace body and arranged in sequence from bottom to top: A base, the upper end of which is open, and a smoke inlet is arranged on one side of the base; The evaporator is arranged at the upper end of the base, and comprises an evaporator barrel, an evaporator upper tube plate, an evaporator lower tube plate and a threaded smoke pipe, wherein the threaded smoke pipe is vertically arranged at the axis of the evaporator barrel, and the evaporator upper tube plate and the evaporator lower tube plate are respectively connected to the upper and lower ends of the evaporator barrel; A smoke outlet, which is arranged in the middle of the upper end of the evaporator and is connected to the threaded smoke pipe; Among them, a plurality of downcomers are connected through the lower end of the side wall of the evaporator cylinder, and a plurality of connection holes connected with the upcomers are opened on the upper tube plate of the evaporator.

7. The vertical waste heat boiler according to claim 6, characterized in that: The upper and lower ends of the threaded smoke pipe respectively penetrate the corresponding evaporator upper tube plate and evaporator lower tube plate to achieve the circulation of smoke.

8. The vertical waste heat boiler according to claim 6, characterized in that: At least one group of guide plates is also arranged in the evaporator, each group of guide plates includes an annular guide plate and a tube hole guide plate, and the inner diameter of the annular guide plate is less than or equal to the outer diameter of the tube hole guide plate.

9. The vertical waste heat boiler according to claim 6, characterized in that: A fixed sewage pipe is arranged at the lower end of the evaporator cylinder.

10. The vertical waste heat boiler according to claim 6, characterized in that: The annular steam drum is located at the top of the evaporator and is arranged outside the smoke outlet. At the same time, the inner diameter of the annular steam drum is larger than the outer diameter of the evaporator, and the lower tube plate of the annular steam drum is higher than the upper tube plate of the evaporator.

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