A sgH heat exchanger assembly

Abstract

The application discloses an SGH heat exchanger assembly, which comprises a heat exchanger shell, a heat exchange cavity for flue gas passing is arranged in the heat exchanger shell, a heat exchange tube bundle communicated with a downstream of a steam supply source is arranged in the heat exchange cavity, a liquid level control tank is arranged downstream of the heat exchanger shell, a feeding port communicated with a downstream of the heat exchange tube bundle is arranged at the top of the liquid level control tank, a discharging port is arranged at the bottom of the liquid level control tank, and a control valve is communicated downstream of the discharging port; and a plurality of cooling pipes communicated with a downstream of a condensate water supply source are arranged at the lower part of the inner cavity of the liquid level control tank. The SGH heat exchanger assembly is stable and efficient in overall operation, has small system fluctuation, is not easy to be impacted, and can guarantee stable operation of the whole flue gas treatment system.

Description

Technical Field

[0001] This invention relates to the technical field of supporting equipment for waste incineration systems, and in particular to an SGH heat exchanger assembly. Background Technology

[0002] Currently, in conventional waste treatment, flue gas denitrification (SCR) systems (selective catalytic reduction) are mainly used to treat flue gas from municipal solid waste incineration to achieve NO reduction. X The pollutant emissions are ultra-low, meeting the flue gas emission standards.

[0003] For a typical flue gas denitrification (SCR) system, an SGH heat exchanger (i.e., a steam-flue gas heat exchanger, a type of heat exchanger that heats flue gas with steam to increase the temperature of the flue gas entering the SCR system to meet the requirements of the catalyst) is required for system operation. The flue gas from municipal solid waste incineration is heated to 180℃-230℃ through the SGH heat exchanger, and then undergoes a catalytic reduction reaction with liquid ammonia, ammonia water, or ammonia from the decomposition of urea when passing through the catalyst, thus reducing the NO in the flue gas. X The gas is reduced and decomposed into N2 and H2O, which are harmless to the environment, and then emitted with the flue gas, thus achieving the goal of environmental protection.

[0004] During flue gas treatment, condensate is generated on the steam side of the SGH heat exchanger. This condensate contains pressure, temperature, and heat. The effectiveness of condensate drainage is crucial for the normal operation of the SGH heat exchanger, energy conservation, and efficient utilization. It also affects whether the flue gas temperature can reach the optimal temperature for catalyst reduction, ensuring NO₂ levels are maintained. X It is reduced and decomposed into harmless gases.

[0005] In practical applications, when assembling and operating existing SGH heat exchangers and their supporting components, the condensate inlet of the gas-liquid separator is connected to the steam outlet of the SGH heat exchanger. In this way, the condensate output from the steam outlet of the SGH heat exchanger flows through a steam trap assembly and then enters the gas-liquid separator through the condensate inlet. After entering the gas-liquid separator, the condensate separates into flash steam and liquid. The flash steam is output from the steam recovery outlet at the top of the gas-liquid separator for steam recovery and reuse, while the liquid is output from the condensate outlet at the bottom of the gas-liquid separator. Automatic liquid drainage from the condensate outlet is controlled by a water seal structure, and the pressure of the water seal structure and the gas-liquid separator is balanced by a balancing pipe to recover and reuse the condensate.

[0006] Although the existing conventional SGH heat exchangers and their supporting components can meet basic flue gas treatment requirements, their SGH condensate outlets use a condensate valve assembly in conjunction with a condensate pipeline to send the high-temperature gas-liquid mixture into the gas-liquid separator for gas-liquid separation. However, since the entire gas-liquid separation and fluid conduction process relies on the system's self-regulation, the system's operation fluctuates significantly, adversely affecting the stable operation of related components. Furthermore, because the condensate valve operates by accumulating water to a certain amount and then opening to discharge it, its operation is intermittent. Consequently, pressure fluctuations occur at the moment the valve opens and closes, making the valve prone to damage and negatively impacting the overall continuity and stability of the system.

[0007] In view of this, how to optimize the operational stability of the SGH heat exchanger and its supporting component system, avoid system fluctuations and impacts on the components, and ensure the stable operation of the entire flue gas treatment system is an important technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to provide an SGH heat exchanger assembly that is stable and efficient in overall operation, with minimal system fluctuations, and is not easily affected by shocks, thus ensuring the stable operation of the entire flue gas treatment system.

[0009] To solve the above-mentioned technical problems, the present invention provides an SGH heat exchanger assembly, including a heat exchanger shell, a heat exchange chamber through which flue gas passes, a heat exchange tube bundle connected to the downstream of a hot steam supply source in the heat exchange chamber, a liquid level control tank downstream of the heat exchanger shell, a feed inlet connected to the downstream of the heat exchange tube bundle at the top of the liquid level control tank, a discharge port at the bottom of the liquid level control tank, and a control valve connected downstream of the discharge port.

[0010] The lower part of the inner cavity of the liquid level control tank is provided with several cooling pipes connected to the downstream of the condensate supply source.

[0011] Preferably, the liquid level control tank is equipped with a liquid level gauge that is communicatively connected to the regulating valve.

[0012] Preferably, a discharge main pipe is connected downstream of the discharge port, and the control valve is located on the discharge main pipe.

[0013] Preferably, a discharge branch pipe is connected downstream of the discharge port, and the discharge branch pipe is connected in parallel with the discharge main pipe.

[0014] Preferably, the heat exchange tube bundle is inclinedly disposed within the heat exchange cavity, and the inlet end of the heat exchange tube bundle is higher than its outlet end.

[0015] Preferably, the top of the liquid level control tank has an exhaust port, and the exhaust port is connected to the inlet end of the heat exchange tube bundle through an air balance pipe.

[0016] Preferably, the lower part of the liquid level control tank is provided with a plurality of baffles, the baffles extending in the horizontal direction, and the baffles being arranged sequentially and staggered in the vertical direction.

[0017] Preferably, the cooling pipes extend vertically and penetrate the baffle, and the cooling pipes are arranged in an array along the horizontal direction.

[0018] Preferably, the bottom of the liquid level control tank has a liquid inlet connected to the downstream of the condensate supply source, and the side wall of the liquid level control tank is also provided with a liquid outlet, the liquid outlet being higher than the liquid inlet, and the top of the cooling pipe not being higher than the liquid outlet.

[0019] Compared to the aforementioned background technology, the SGH heat exchanger assembly provided by this invention, during its operation, hot steam is introduced into the heat exchange tube bundle to exchange heat with the flue gas flowing through the heat exchange chamber, thereby heating the flue gas for subsequent flue gas treatment. After heat exchange, the heat exchange medium is introduced into the level control tank through the inlet, where it exchanges heat with the condensate flowing into the cooling pipe, cooling the heat exchange medium to a subcooled state. Then, the heat exchange medium is discharged from the level control tank through the outlet and discharged to downstream equipment such as the deaerator through the control valve, completing the operation process. During this process, the flow rate and discharge volume of the entire pipeline system are controlled by the control valve, thereby forming continuous regulation of the operation of the entire SGH heat exchanger assembly and ensuring smooth operation of the entire system. During the overall operation of the SGH heat exchanger assembly, the use of a liquid level control tank as a cooling device for the heat exchange medium, combined with real-time control of the control valve, enables smooth adjustment and stable control of the SGH heat exchanger assembly. This avoids system pressure fluctuations and component structural impacts caused by the intermittent operation of the steam trap group in the prior art, optimizes the overall operational stability and smoothness of the SGH heat exchanger and its supporting component system, and makes the overall operation of the corresponding flue gas treatment system more stable and reliable.

[0020] In another preferred embodiment of the present invention, the liquid level control tank is equipped with a liquid level gauge that is communicatively connected to the regulating valve. The liquid level gauge monitors the liquid level in the control tank in real time, and the monitoring results are fed back to the regulating valve via the communication connection. This allows the regulating valve to adjust the discharge rate of the heat exchange medium according to the liquid level in the control tank, thereby ensuring that the liquid level in the control tank is always at the appropriate operating position, guaranteeing the required water volume at the bottom of the tank, and thus ensuring the heat exchange efficiency and effect at the cooling pipes. This further optimizes the drainage and heat exchange effects of the SGH heat exchanger components, improving the overall system control accuracy and operational stability. Attached Figure Description

[0021] 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 will be 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 these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the component layout structure of an SGH heat exchanger assembly provided in a specific embodiment of the present invention.

[0023] Figure 2 for Figure 1 A schematic diagram of the structure of the intermediate liquid level control tank.

[0024] in:

[0025] 10 - Hot steam supply source;

[0026] 20 - Condensate supply source;

[0027] 11-Heat exchanger shell; 111-Heat exchange chamber; 112-Heat exchange tube bundle;

[0028] 12-Level control tank; 121-Inlet; 122-Discharge port; 123-Cooling pipe; 124-Level gauge; 125-Exhaust port; 126-Gas balance pipe; 127-Baffle; 128-Liquid inlet; 129-Discharge port;

[0029] 13-Control valve; 131-Main discharge pipe; 132-Branch discharge pipe. Detailed Implementation

[0030] The core of this invention is to provide an SGH heat exchanger assembly that is stable and efficient in overall operation, with minimal system fluctuations, and is not easily affected by shocks, thus ensuring the stable operation of the entire flue gas treatment system.

[0031] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] It should be noted in advance that, in this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Furthermore, in this invention, unless otherwise expressly specified and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or contact between the first and second features not being in direct contact but through another feature between them.

[0034] In addition, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "under," and "beneath" for the first feature and the second feature include the first feature being directly below or diagonally below the second feature, or simply indicating that the first feature is at a lower horizontal level than the second feature. The terms "above," "below," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0035] Please refer to the reference. Figure 1 and Figure 2 .

[0036] In a specific embodiment, the SGH heat exchanger assembly provided by the present invention includes a heat exchanger shell 11, a heat exchange chamber 111 through which flue gas passes, a heat exchange tube bundle 112 connected to the downstream of a hot steam supply source 10 in the heat exchange chamber 111, a liquid level control tank 12 downstream of the heat exchanger shell 11, a feed inlet 121 connected to the downstream of the heat exchange tube bundle 112 at the top of the liquid level control tank 12, a discharge port 122 at the bottom of the liquid level control tank 12, and a control valve 13 connected downstream of the discharge port 122.

[0037] The lower part of the inner cavity of the liquid level control tank 12 is provided with several cooling pipes 123 that are connected to the downstream of the condensate supply source 20.

[0038] During its operation, hot steam is introduced into the heat exchange tube bundle 112 to exchange heat with the flue gas flowing through the heat exchange chamber 111, thereby heating the flue gas for subsequent flue gas treatment. After the heat exchange is completed, the heat exchange medium is introduced into the level control tank 12 through the feed port 121, where it exchanges heat with the condensate flowing into the cooling pipe 123, cooling the heat exchange medium to a subcooled state. Then, the heat exchange medium is discharged from the level control tank 12 through the discharge port 122 and discharged to downstream equipment such as the deaerator through the control valve 13, completing the operation process. During this process, the flow rate and discharge volume of the entire pipeline system are controlled by the control valve 13, thereby forming continuous regulation of the operation of the entire SGH heat exchanger assembly and ensuring the smooth operation of the entire assembly system. During the overall operation of the SGH heat exchanger assembly, the use of the liquid level control tank 12 as a cooling device for the heat exchange medium, combined with the real-time regulation of the control valve 13, enables smooth adjustment and stable control of the SGH heat exchanger assembly. This avoids system pressure fluctuations and component structural impacts caused by the intermittent operation of the condensate valve group in the prior art, optimizes the overall operational stability and smoothness of the SGH heat exchanger and its supporting component system, and makes the overall operation of the corresponding flue gas treatment system more stable and reliable.

[0039] Furthermore, a level gauge 124 is installed on the level control tank 12, which is communicatively connected to the regulating valve. The level gauge 124 monitors the liquid level in the level control tank 12 in real time, and the monitoring results are fed back to the regulating valve via the communication connection. This allows the regulating valve to adjust the discharge rate of the heat exchange medium according to the liquid level in the level control tank 12, thereby ensuring that the liquid level in the level control tank 12 is always at the appropriate position for the operating conditions, ensuring the required water volume at the bottom of the level control tank 12, and thus ensuring the heat exchange efficiency and effect at the cooling pipe 123. This further optimizes the drainage and heat exchange effect of the SGH heat exchanger components, and improves the overall system control accuracy and operational stability.

[0040] Generally, the regulating valve can be an electrically controlled valve, and the communication connection between the level gauge 124 and the regulating valve can be achieved directly through a near-field communication module such as Bluetooth, or through a signal relay device such as a controller. In practical applications, operators can flexibly select and adjust the communication coordination between the regulating valve and the level gauge 124 according to specific operating conditions. In principle, any method that meets the actual application needs of the SGH heat exchanger assembly is acceptable.

[0041] On the other hand, a discharge main pipe 131 is connected downstream of the discharge port 122, and a control valve 13 is located on the discharge main pipe 131. Under normal operating conditions, the material discharged through the discharge port 122 enters the discharge main pipe 131 and is discharged to downstream equipment such as deaerators through the discharge main pipe 131.

[0042] Correspondingly, a discharge branch pipe 132 is also connected downstream of the discharge port 122, and the discharge branch pipe 132 is connected in parallel with the discharge main pipe 131. Under normal circumstances, the discharge main pipe 131 is in a normally open state, while the discharge branch pipe 132 is in a normally closed state. When the regulating valve malfunctions, or when the regulating valve and other parts and components of the discharge main pipe 131 need to be inspected, maintained, or replaced, the discharge main pipe 131 can be disconnected by the manual valve located at the discharge main pipe 131, and the manual valve at the discharge branch pipe 132 can be opened to make the discharge branch pipe 132 open. In this way, the material discharged from the discharge port 122 can be transported to the downstream equipment through the discharge branch pipe 132, ensuring the overall stable operation of the SGH heat exchanger assembly. After the corresponding inspection, maintenance, or component replacement work is completed, the discharge branch pipe 132 can be disconnected and the discharge main pipe 131 can be opened again by the manual valve at each pipeline, so that the SGH heat exchanger assembly can be restored to the normal operating condition, avoiding material accumulation and poor discharge, and ensuring the stable and efficient operation of the system.

[0043] Furthermore, the heat exchange tube bundle 112 is inclined within the heat exchange chamber 111, with its inlet end higher than its outlet end. This inclined arrangement, with the inlet end significantly higher than the outlet end, creates a slope in the heat exchange tube bundle 112. This facilitates the natural flow of materials within the heat exchange tube bundle 112 by utilizing their own weight, causing the heat exchange medium to automatically flow towards the outlet end of the heat exchange tube bundle 112, completing the condensate circulation process. This improves the medium circulation efficiency at the heat exchange tube bundle 112 and correspondingly enhances the heat exchange efficiency and effect at the SGH heat exchanger.

[0044] It should be noted that in practical applications, the heat exchanger tube bundle 112 can be a single, complete, sloping extension structure, or it can be a multi-section, multi-angle, variable-direction sloping extension structure as shown in the figure. Operators can flexibly choose the specific structural form of the heat exchanger tube bundle 112 based on actual operating conditions and component layout space. In principle, as long as the inlet end of the heat exchanger tube bundle 112 is higher than its outlet end, and the heat exchanger tube bundle 112 is arranged with an overall inclined slope, it is acceptable. The actual structural effect of the component is simply to enable the self-flow and smooth circulation of the heat exchange medium within the heat exchanger tube bundle 112.

[0045] Furthermore, the top of the level control tank 12 has an exhaust port 125, which is connected to the inlet end of the heat exchange tube bundle 112 via a gas balance pipe 126. During equipment operation, after the heat exchange medium introduced into the level control tank 12 completes heat exchange with the cooling pipe 123, the escaping gas can be guided to the inlet end of the heat exchange tube bundle 112 via the gas balance pipe 126, thereby merging with the hot steam supplied from the hot steam supply source 10 connected upstream of the heat exchange tube bundle 112, and flowing into the heat exchange tube bundle 112 as a whole to complete the next circulation cycle, thereby improving the overall heat utilization rate of the system and avoiding energy waste.

[0046] In practical applications, the hot steam supply source 10 can be a waste heat boiler drum, and the hot steam can be high-temperature saturated steam supplied from the waste heat boiler drum. Of course, in practical applications, depending on the specific equipment type and operating environment, the hot steam supply source 10 can also be other equipment, and operators can flexibly select and adjust it. In principle, any equipment that can meet the actual application needs of the SGH heat exchanger assembly is acceptable.

[0047] Specifically, the lower part of the liquid level control tank 12 is provided with several baffles 127. The baffles 127 extend horizontally and are arranged vertically in a staggered manner. The baffles 127 work together to form a stable flow of the heat exchange medium entering the liquid level control tank 12, avoiding phenomena such as liquid surface turbulence, and further preventing structural impact and pressure fluctuations on the liquid level control tank 12 and related connecting components, thus ensuring the overall stable operation of the system.

[0048] More specifically, the cooling pipes 123 extend vertically and pass through the baffle 127, and the cooling pipes 123 are arranged in an array in a horizontal direction. The baffle 127 can provide structural support and limit the cooling pipes 123, preventing them from tipping over or shifting, and ensuring the stable operation of the heat exchange process. The array arrangement can further optimize the heat exchange efficiency between the condensate inside the cooling pipes 123 and the heat exchange medium outside the cooling pipes 123, improve the heat exchange effect, and thus improve the overall operating efficiency and performance of the SGH heat exchanger assembly.

[0049] In addition, the bottom of the level control tank 12 has an inlet 128 connected to the downstream of the condensate supply source 20. A drain 129 is also provided on the side wall of the level control tank 12. The drain 129 is higher than the inlet 128, and the top of the cooling pipe 123 is not higher than the drain 129. The condensate flowing into each cooling pipe 123 from the inlet 128 is discharged through the drain 129 after heat exchange and is sent to downstream equipment such as the deaerator. Positioning the cooling pipe 123 at a position no higher than the drain 129 ensures that the cooling pipe 123 is always below the liquid level inside the level control tank 12, or at least not higher than the liquid level. This ensures that the cooling pipe 123 can fully and uniformly exchange heat with the heat exchange medium flowing into the level control tank 12, improving heat exchange efficiency, optimizing heat exchange effect, and avoiding heat waste. This further optimizes the operational stability and efficiency of the SGH heat exchanger assembly.

[0050] In summary, the SGH heat exchanger assembly provided in this invention includes a heat exchanger shell, a heat exchange chamber through which flue gas passes, a heat exchange tube bundle connected to the downstream of a hot steam supply source within the heat exchange chamber, a liquid level control tank downstream of the heat exchanger shell, an inlet at the top of the liquid level control tank connected to the downstream of the heat exchange tube bundle, a discharge port at the bottom of the liquid level control tank, and a control valve connected downstream of the discharge port; a plurality of cooling pipes connected to the downstream of a condensate supply source are provided in the lower part of the inner cavity of the liquid level control tank. During its operation, hot steam is introduced into the heat exchange tube bundle to exchange heat with the flue gas flowing through the heat exchange chamber, thereby heating the flue gas for subsequent flue gas treatment. After heat exchange, the heat exchange medium is introduced into the level control tank through the feed port, where it exchanges heat with the condensate flowing into the cooling pipes, cooling the heat exchange medium to a subcooled state. Then, the heat exchange medium is discharged from the level control tank through the discharge port and discharged to downstream equipment such as the deaerator through the control valve, completing the operation process. During this process, the flow rate and discharge volume of the entire pipeline system are controlled by the control valve, thereby forming continuous regulation of the operation of the entire SGH heat exchanger assembly and ensuring the smooth operation of the entire system. During the overall operation of the SGH heat exchanger assembly, the use of a liquid level control tank as a cooling device for the heat exchange medium, combined with real-time control of the control valve, enables smooth adjustment and stable control of the SGH heat exchanger assembly. This avoids system pressure fluctuations and component structural impacts caused by the intermittent operation of the steam trap group in the prior art, optimizes the overall operational stability and smoothness of the SGH heat exchanger and its supporting component system, and makes the overall operation of the corresponding flue gas treatment system more stable and reliable.

[0051] The SGH heat exchanger assembly provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. An SGH heat exchanger assembly, characterized in that, The device includes a heat exchanger shell, which has a heat exchange chamber through which flue gas passes. The heat exchange chamber is provided with a heat exchange tube bundle connected to the downstream of a hot steam supply source. A liquid level control tank is provided downstream of the heat exchanger shell. The top of the liquid level control tank has a feed inlet connected to the downstream of the heat exchange tube bundle, and the bottom of the liquid level control tank has a discharge port. A control valve is connected downstream of the discharge port. The lower part of the inner cavity of the liquid level control tank is provided with several cooling pipes connected to the downstream of the condensate supply source, which are used to cool the heat exchange medium introduced into the liquid level control tank to a subcooled state. The liquid level control tank is equipped with a liquid level gauge that is in communication with the regulating valve. The control valve is configured to adjustably control the discharge rate of the discharge port to achieve continuous discharge of the heat exchange medium. The heat exchange tube bundle is inclinedly arranged in the heat exchange cavity, and the inlet end of the heat exchange tube bundle is higher than its outlet end. The lower part of the liquid level control tank is provided with several baffles, which extend horizontally and are arranged in sequence and staggered vertically.

2. The SGH heat exchanger assembly as claimed in claim 1, characterized in that, The discharge port is connected downstream to a main discharge pipe, and the control valve is located on the main discharge pipe.

3. The SGH heat exchanger assembly as described in claim 2, characterized in that, Downstream of the discharge port is a discharge branch pipe, which is connected in parallel with the main discharge pipe.

4. The SGH heat exchanger assembly as claimed in claim 1, characterized in that, The top of the liquid level control tank has an exhaust port, which is connected to the inlet end of the heat exchange tube bundle via an air balance pipe.

5. The SGH heat exchanger assembly as claimed in claim 1, characterized in that, The cooling pipes extend vertically and penetrate the baffle, and the cooling pipes are arranged in an array along the horizontal direction.

6. The SGH heat exchanger assembly as claimed in claim 1, characterized in that, The bottom of the liquid level control tank has an inlet connected to the downstream of the condensate supply source, and a drain outlet is also provided on the side wall of the liquid level control tank. The drain outlet is higher than the inlet, and the top of the cooling pipe is not higher than the drain outlet.

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