Air heater system
By designing a heater system including steam regulation module, air heater body, hydrophobic pressure balance module, hydrophobic recovery module and condensation module, the safety risks and warmth caused by the cold end temperature of the thermal power unit air preheater is solved. The problem of high failure rate of the air blower system achieves normal operation of the system and efficient utilization of condensate.
Patent Information
- Application Number
- CN202420958005.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-05-06
AI Technical Summary
During winter or deep peak regulating periods, the temperature of the air preheater cold end is too low, resulting in low temperature corrosion, ash blockage and dynamic and static friction, increasing the safety risk of unit operation. At the same time, the air heater system has vapor and liquid vibration and failure rate. The problem of high and low condensate recycling rate.
A air heater system is designed, which includes a steam regulation module, a air heater body, a hydrophobic pressure balance module, a hydrophobic recovery module and a condensation module. The steam output is adjusted through the steam regulation module, and the air heater body is preheated. The hydrophobic recovery module recycles condensate and ensures smooth water through the hydrophobic pressure balance module to avoid vapor and liquid vibration.
It effectively avoids vapor and liquid vibration, ensures the normal operation of the system, improves the utilization rate of condensate, reduces energy saving costs, and enhances the safety of the unit.
Smart Images
Figure CN222527691U_ABST
Abstract
Description
Technical Field
[0001] The embodiment of the utility model relates to the technical field of deep peak regulation of thermal power units, and in particular to a heater system. Background Art
[0002] In winter or during deep peak load regulation, the inlet air temperature of the boiler air preheater of the thermal power unit is low, and the outlet flue gas temperature drops accordingly. The cold end comprehensive temperature of the air preheater is too low. When it drops below the dew point temperature of SO2 and SO3 in the flue gas, SO2, SO3 and water vapor in the flue gas condense to form sulfurous acid and sulfuric acid, causing low-temperature corrosion of the cold section of the air preheater, and low-temperature ash blockage of the heating element at the cold end of the air preheater, resulting in an increase in the differential pressure of the air preheater, increasing the safety risk of the unit operation. At the same time, when the cold end comprehensive temperature of the air preheater is too low, the thermal deformation and stress of the hot and cold ends of the air preheater will increase. In severe cases, it will cause dynamic and static friction, and the air preheater will trip due to overcurrent, causing unsafe events.
[0003] At present, the system of the heater added at the inlet of the air preheater has an unreasonable design, and the gas-liquid vibration is obvious, resulting in a high system failure rate and inability to operate normally. At the same time, the drainage system has an unreasonable design, which will also cause the condensed water after condensation to fail to be effectively recovered, the utilization rate is low, the energy-saving effect is poor, and the economy is poor. Utility Model Content
[0004] The embodiment of the utility model provides a heater system to avoid gas-liquid vibration and ensure the normal operation of the system; at the same time, it also improves the utilization rate of condensed water and has a good energy-saving effect.
[0005] To achieve the above objectives, the embodiment of the utility model provides a heater system, which is applied to the air preheater in the thermal power unit, and the system includes: a steam regulating module, a heater body, a drain pressure balance module, a drain recovery module, a condensation module and a control module;
[0006] The steam regulating module is in communication with the steam inlet of the heater body; the drain outlet of the heater body is in communication with the inlet of the drain recovery module; the outlet of the drain recovery module is in communication with the condensing module; the drain pressure balancing module is disposed between the inlet of the drain recovery module and the outlet of the drain recovery module through a pressure balancing pipeline;
[0007] Optionally, the liquid level of the hydrophobic pressure balancing module is between the lowest liquid level of the hydrophobic recovery module and the highest liquid level of the hydrophobic recovery module.
[0008] Optionally, the heater body includes a plurality of module heat exchange units;
[0009] The steam regulating module comprises a steam main pipeline and a plurality of steam inlet pipelines; a regulating valve and a switch valve are arranged on the steam main pipeline; and a steam branch switch valve is arranged on each of the steam inlet pipelines;
[0010] The steam main pipeline is communicated with each of the steam inlet pipelines; each of the steam inlet pipelines is communicated with the steam inlet of each of the module heat exchange units.
[0011] Optionally, the heater body includes a plurality of module heat exchange units;
[0012] The drain recovery module includes a plurality of drain outlet pipes and a collecting and expanding drain tank; each of the drain outlet pipes is provided with a drain trap and a drain branch switch valve;
[0013] The drain outlet of each of the module heat exchange units is connected to the inlet of the collecting and expanding drain tank through each of the drain outlet pipes; the outlet of the collecting and expanding drain tank is connected to the condensing module through a drain pipe.
[0014] Optionally, the heater body further includes a rotating unit; the rotating unit is used to drive each of the module heat exchange units to rotate 360°.
[0015] Optionally, each of the module heat exchange units further includes a rotary sealing unit; the rotary sealing unit is made of carbon fiber material.
[0016] Optionally, each of the module heat exchange units is an integrally extruded spiral fin tube.
[0017] Optionally, each of the module heat exchange units further includes a telescopic sub-section;
[0018] The telescopic sub-section is arranged between the steam inlet pipe and the steam inlet of the module heat exchange unit;
[0019] And / or, the telescopic sub-section is arranged between the drain outlet pipe and the drain outlet of the module heat exchange unit.
[0020] Optionally, the system further includes: a water seal module; the water seal module is arranged between the hydrophobic recovery module and the condensation module.
[0021] Optionally, the system further includes: a vacuum stop valve; the vacuum stop valve is arranged between the water seal module and the condensation module.
[0022] In the embodiment of the utility model, the steam regulating module is connected with the steam inlet of the heater body; the drain outlet of the heater body is connected with the inlet of the drain recovery module; the outlet of the drain recovery module is connected with the condensation module; the drain pressure balance module is arranged between the inlet of the drain recovery module and the outlet of the drain recovery module through a pressure balance pipe; the control module is electrically connected to the steam regulating module for adjusting the steam output of the steam regulating module; in this way, the steam regulating module outputs steam to the heater body; the heater body exchanges heat between the steam and the air at the inlet of the air preheater and produces condensed water; the drain recovery module recovers the condensed water and discharges it into the condensation module, thereby realizing the heating treatment of the air preheater, and at the same time, the drain pressure balance module ensures that the drain recovery module always retains the condensed water, the system drains smoothly, and plays a water seal role to ensure the vacuum degree of the condensation module, thereby avoiding steam-liquid vibration and poor draining, thereby ensuring the normal operation of the system; at the same time, it also improves the utilization rate of condensed water and has a good energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a structural schematic diagram of a heater system provided by an embodiment of the utility model;
[0024] Figure 2 It is a specific structural schematic diagram of a warm air system provided by an embodiment of the utility model;
[0025] Figure 3 It is a specific structural schematic diagram of another heating system provided by an embodiment of the utility model;
[0026] Figure 4 It is a specific structural schematic diagram of another heating system provided by an embodiment of the utility model;
[0027] Figure 5 It is a specific structural schematic diagram of another heating system provided by an embodiment of the utility model;
[0028] Figure 6 It is a schematic diagram of the specific structure of a heater body provided by an embodiment of the utility model;
[0029] Figure 7 It is a specific structural schematic diagram of another warm air system provided by an embodiment of the utility model. DETAILED DESCRIPTION
[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0031] Figure 1 : is a schematic diagram of the structure of a heater system provided by an embodiment of the utility model. The heater system is applied to an air preheater in a thermal power unit. The heater system is arranged at the inlet of the air preheater and is used to heat the air preheater. Figure 1 As shown, the system includes: a steam regulating module 10, a heater body 20, a drain recovery module 30, a drain pressure balancing module 40, a condensation module 50 and a control module 60;
[0032] The steam regulating module 10 is communicated with the steam inlet of the heater body 20; the drain outlet of the heater body 20 is communicated with the inlet of the drain recovery module 30; the outlet of the drain recovery module 30 is communicated with the condensation module 50; the drain pressure balancing module 40 is arranged between the inlet and the outlet of the drain recovery module 30 through a pressure balancing pipeline;
[0033] The control module 60 is electrically connected to the steam regulating module 10 and is used to regulate the steam output of the steam regulating module 10 .
[0034] In this embodiment, the steam regulating module 10 can adjust the output steam volume according to the extraction sources of different areas under the control instruction of the control module 60; the extraction sources of different areas can actually be selected according to the different loads of the thermal power units, different ambient temperatures, the comprehensive temperature of the cold end required by the air preheater, the temperature of the flue gas acid dew point, and the changes in the primary and secondary air volumes and air temperatures caused by deep peak regulation and different coal qualities;
[0035] The heater body 20 is a carrier for gas-liquid two-phase flow and air heat and mass transfer, and can achieve heat exchange with the external air; the hydrophobic recovery module 30 can recover the condensed water after the heater body 20 is condensed; the liquid level of the hydrophobic pressure balance module 40 is between the lowest liquid level of the hydrophobic recovery module 30 and the highest liquid level of the hydrophobic recovery module, which can ensure that the hydrophobic recovery module 30 always retains the condensed water, the system drains smoothly, and plays a water seal role to ensure the vacuum degree of the condensation module 50; this embodiment does not limit the specific structure of the hydrophobic pressure balance module 40. The condensation module 50 may include a unit condenser or a hot well;
[0036] In this embodiment, steam is output to the heater body 20 through the steam regulating module 10; the heater body 20 exchanges heat between the steam and the air at the inlet of the air preheater and generates condensed water; the drain recovery module 30 recovers the condensed water and discharges it into the condensation module 50, thereby achieving heating treatment of the air preheater and avoiding low-temperature corrosion, dust accumulation and ammonium bisulfate deposition; at the same time, the drain pressure balance module 40 ensures that the drain recovery module 30 always retains condensed water, the system drains smoothly, and plays a water seal role to ensure the vacuum degree of the unit condenser or hot well, thereby avoiding poor drainage due to steam-liquid vibration and ensuring the normal operation of the system; at the same time, it also improves the utilization rate of condensed water and improves the energy-saving effect.
[0037] Optionally, the hydrophobic pressure balancing module 40 is further refined, and the hydrophobic pressure balancing module 40 includes a hydrophobic pressure balancing device.
[0038] Specifically, the hydrophobic pressure balancing module 40 can adopt a hydrophobic pressure balancing device, the liquid level of which is between the lowest liquid level of the hydrophobic recovery module 30 and the highest liquid level of the hydrophobic recovery module, which can ensure that the hydrophobic recovery module 30 always retains condensed water, the system drains smoothly, and acts as a water seal to ensure the vacuum degree of the condensation module 50.
[0039] Optionally, based on the above embodiment, other modules are further refined. Figure 2 Schematic diagram of the specific structure of a heater system provided by the embodiment of the utility model. Figure 2 As shown, the heater body 20 includes a plurality of module heat exchange units 21; the steam regulating module 10 includes a steam header 11, a steam main pipeline a and a plurality of steam inlet pipelines b; a regulating valve 12 and a switch valve 13 are arranged on the steam main pipeline a; a steam branch switch valve 14 is arranged on each steam inlet pipeline b; the steam main pipeline a is connected with each steam inlet pipeline b; each steam inlet pipeline b is connected with the steam inlet of each module heat exchange unit 21 in a one-to-one correspondence.
[0040] The steam header 11 can use the extracted air from different areas of the actual thermal power unit as the steam source; for example, the steam source can be taken from the fourth or fifth stage of the unit extraction steam; the steam output from the steam header 11 enters each steam inlet pipe b through the steam main pipe a, and then enters each module heat exchange unit 21 for heat exchange, thereby achieving independent heat exchange for different areas and improving the reliability of heat exchange;
[0041] Specifically, a switch valve 13 is arranged on the steam main pipeline a to control the on and off of the steam output from the steam manifold 11; a regulating valve 12 is arranged on the steam main pipeline a, and the regulating valve 12 is electrically connected to the control module 60, and the control module 60 controls the steam flux output from the steam manifold 11 according to the heat exchange demand of the actual heat exchange area; a steam branch switch valve 14 is arranged on each steam inlet pipeline b, which can realize the on and off of the steam on each steam inlet pipeline b; in this way, automatic and flexible adjustment in the heat exchange process is realized through the switch valve 13, the regulating valve 12 and the steam branch switch valves 14.
[0042] Optionally, in some embodiments, Figure 3 is a specific structural diagram of another heater system provided by an embodiment of the utility model, such as Figure 3 As shown, the heater body 20 includes a plurality of module heat exchange units 21; the drain recovery module 30 includes a plurality of drain outlet pipes c and a collecting and expanding drain tank 31; each drain outlet pipe c is provided with a drain branch switch valve 32 and a drain trap 33; the drain outlet of each module heat exchange unit 21 is connected to the inlet of the collecting and expanding drain tank 31 through each drain outlet pipe c; the outlet of the collecting and expanding drain tank 31 is connected to the condensing module 50 through a drain pipe.
[0043] Among them, the condensed water after condensation of multiple module heat exchange units 21 enters each steam trap 33 through multiple steam trap outlet pipes c and each steam trap branch switch valve 32. Each steam trap 33 plays a role in regulating gas-liquid separation, thereby ensuring that the medium at the outlet of each steam trap 33 is all condensed water. Condensed water with different pressures enters the collecting and expanding steam trap tank 31 for pressure equalization and expansion, and then flows into the condensation module 50 through the steam trap pipe. Since the steam trap outlet pipes c do not affect each other, independent steam trap control of each module heat exchange unit 21 is realized, thereby improving the reliability of the system; among them, each steam trap branch switch valve 32 can control the automatic on and off of each steam trap process.
[0044] In other embodiments, Figure 4 is a specific structural diagram of another heater system provided by an embodiment of the utility model, such as Figure 4 As shown, each drain outlet pipe c corresponds to each steam inlet pipe b one by one; in this way, the steam in each steam inlet pipe b enters each heat exchange unit 21 to realize heat exchange, and the condensed water after condensation in each module heat exchange unit 21 passes through the corresponding drain outlet pipe c one by one, and the condensed water flows into the collecting and expanding drain tank 31 for pressure equalization expansion, thereby realizing independent control of the overall heat exchange and draining.
[0045] Optional, Figure 5 is a specific structural diagram of another air heater system provided by an embodiment of the utility model, Figure 6Schematic diagram of the specific structure of a heater body provided by the embodiment of the utility model; Figure 5-6 As shown, the heater body 20 further includes a rotating unit 22; the rotating unit 22 is used to drive each module heat exchange unit to rotate 360 degrees.
[0046] The rotating unit 22 drives each module heat exchange unit to rotate 360°, thereby preventing the heat exchange surface of the heater body 20 from being seriously contaminated, reducing the system resistance, and thus improving the heat exchange capacity of the heater body 20; in addition, the rotating unit 22 drives each module heat exchange unit to rotate 360°, which can also meet the heating requirements of the air preheater under high and low loads of the thermal power unit; Figure 6 Specifically, the rotating unit 22 drives each module heat exchange unit 21 to rotate from 0° to 90°.
[0047] Optional, continue to refer to Figure 6 , each module heat exchange unit 21 is an integrally extruded spiral fin tube. Among them, each module heat exchange unit 21 is an integrally extruded spiral fin tube, so there is no contact thermal resistance between the integrally extruded spiral fin and the base tube, thereby improving the heat transfer performance of each module heat exchange unit 21 and effectively improving the cold end comprehensive temperature of the air preheater.
[0048] Optional, continue to refer to Figure 6 , each module heat exchange unit 21 further includes a telescopic sub-unit 211; the telescopic sub-unit 211 is arranged between the steam inlet pipe b and the steam inlet of the module heat exchange unit 21; and / or, the telescopic sub-unit 211 is arranged between the drain outlet pipe c and the drain outlet of the module heat exchange unit 21. Wherein, a telescopic sub-unit 211 is arranged in each module heat exchange unit 21, and the telescopic sub-unit 211 is arranged between the steam inlet pipe b and the steam inlet of the module heat exchange unit 21; and / or, the telescopic sub-unit 211 is arranged between the drain outlet pipe c and the drain outlet of the module heat exchange unit 21, so that the problem of volume expansion caused by thermal displacement of each module heat exchange unit 21 can be solved, and the structural integrity of each module heat exchange unit 21 can be ensured.
[0049] Optional, continue to refer to Figure 6 Each module heat exchange unit 21 further includes a rotary sealing unit 212; the rotary sealing unit 212 is made of carbon fiber material. The rotary sealing unit 212 may include carbon fiber material, which can solve the problem of thermal displacement and can also play a role in high temperature resistance.
[0050] Optional, Figure 7 is a specific structural diagram of another heater system provided by an embodiment of the utility model, such as Figure 7As shown, the system further includes: a water seal module 70; the water seal module 70 is arranged between the water-repellent recovery module 30 and the condensation module 50. The water seal module 70 is arranged between the water-repellent recovery module 30 and the condensation module 50, further ensuring the vacuum degree of the condensation module 50, thereby further ensuring smooth water drainage of the system, thereby further avoiding poor water drainage due to vapor-liquid vibration, and ensuring the normal operation of the system; at the same time, the utilization rate of condensed water is further improved, and the energy-saving effect is improved.
[0051] Optional, continue to refer to Figure 7 The system further includes a vacuum stop valve 80, which is arranged between the water seal module and the condensation module. The vacuum stop valve 80 can be shut off during system shutdown and maintenance to protect the system.
[0052] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A heater system, applied to the air preheater in a thermal power unit, characterized in that: include: Steam regulating module, heater body, drain pressure balancing module, drain recovery module, condensation module and control module; The steam regulating module is in communication with the steam inlet of the heater body; the drain outlet of the heater body is in communication with the inlet of the drain recovery module; the outlet of the drain recovery module is in communication with the condensing module; the drain pressure balancing module is disposed between the inlet of the drain recovery module and the outlet of the drain recovery module through a pressure balancing pipeline; The control module is connected to the steam regulating module and is used to regulate the steam output of the steam regulating module.
2. The heater system according to claim 1, characterized in that: The heater body includes a plurality of module heat exchange units; The steam regulating module comprises a steam main pipeline and a plurality of steam inlet pipelines; a regulating valve and a switch valve are arranged on the steam main pipeline; and a steam branch switch valve is arranged on each of the steam inlet pipelines; The steam main pipeline is communicated with each of the steam inlet pipelines; each of the steam inlet pipelines is communicated with the steam inlet of each of the module heat exchange units.
3. The heater system according to claim 2, characterized in that: The drain recovery module includes a plurality of drain outlet pipes and a collecting and expanding drain tank; each of the drain outlet pipes is provided with a drain trap and a drain branch switch valve; The drain outlet of each of the module heat exchange units is connected to the inlet of the collecting and expanding drain tank through each of the drain outlet pipes; the outlet of the collecting and expanding drain tank is connected to the condensing module through a drain pipe.
4. The heater system according to claim 3, characterized in that: The heater body further comprises a rotating unit, which is used to drive each of the module heat exchange units to rotate 360°.
5. The air heater system according to claim 3, characterized in that: Each of the module heat exchange units comprises a rotary sealing unit; the rotary sealing unit is made of carbon fiber material.
6. The air heater system according to claim 3, characterized in that: Each of the module heat exchange units is an integrally extruded spiral fin tube.
7. The air heater system according to claim 3, characterized in that: Each of the module heat exchange units further includes a telescopic sub-section; The telescopic sub-section is arranged between the steam inlet pipe and the steam inlet of the module heat exchange unit; And / or, the telescopic sub-section is arranged between the drain outlet pipe and the drain outlet of the module heat exchange unit.
8. The air heater system according to claim 1, characterized in that: Also includes: Water seal module; the water seal module is arranged between the hydrophobic recovery module and the condensation module.
9. The air heater system according to claim 8, characterized in that: It also includes a vacuum stop valve, which is arranged between the water seal module and the condensation module.