A steam trap for heating air preheater
By adding valve assemblies and electric heaters to the air preheater, the problem of uncontrollable steam pressure was solved, steam pressure became adjustable, steam-water impact in the condensate drain pipe and heat waste were reduced, and the boiler's working efficiency and equipment stability were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANNING SANFENG ENERGY CO LTD
- Filing Date
- 2025-09-02
- Publication Date
- 2026-07-31
AI Technical Summary
In the design of the air preheater, the steam pressure cannot be controlled, resulting in high condensate pressure and temperature. The condensate is a mixture of steam and water. When the condensate is discharged directly into the condensate tank, it causes steam-water impact, pipeline vibration, and heat waste.
Design an air preheater heating steam condensate device, adding a pipe and valve assembly, including a steam box, a condensate box and an air heat exchanger, regulating the steam pressure through the pipe and valve assembly, setting up an electric heater for secondary heating, using a control ball valve and a pressure regulating valve to control the steam flow, and a bypass ball valve to ensure normal operation of the equipment.
It enables adjustable steam pressure, reduces steam-water impact in condensate drain pipes, reduces heat energy waste, and improves boiler efficiency and equipment stability.
Smart Images
Figure CN224580298U_ABST
Abstract
Description
Technical Field
[0001] This utility model specifically relates to the field of air preheater technology, and more specifically to an air preheater heating steam condensate drain device. Background Technology
[0002] By recovering waste heat from flue gas to heat combustion air, boiler thermal efficiency can be improved by 5%-10%. Taking a 1000MW thermal power generating unit as an example, the air preheater can help save tens of thousands of tons of standard coal annually, directly reducing power generation costs.
[0003] Air preheaters are the "masters of waste heat recovery" in boiler systems. Through "flue gas-air heat exchange," they achieve multiple goals of "energy saving, efficiency improvement, and emission reduction," making them an indispensable core device in modern thermal power generation and industrial boilers. Their core logic is "turning waste into treasure"—converting the waste heat of flue gas, which would otherwise be wasted, into heat for combustion air. This reduces energy consumption and optimizes the combustion process, representing a typical application of the "circular economy" in the industrial sector.
[0004] Our original design for the air preheater lacked a steam pressure regulating valve at the inlet, with only a condensate regulating valve at the outlet, which was unreasonable. In actual operation, the inability to control the heating steam pressure led to excessively high condensate pressure and temperature. The condensate was a mixture of steam and water, which was directly discharged into the condensate tank. During the condensate drainage process, steam and water impact within the pipeline caused vibration and abnormal noise, and the high-temperature, high-pressure condensate drainage resulted in wasted heat energy. Utility Model Content
[0005] The purpose of this utility model is to provide a steam condensate drain device for air preheater heating, which adds a valve assembly; makes the steam pressure of air preheater heating adjustable and controllable; and after adding a condensate tank, eliminates the steam-water impact phenomenon in the condensate drain pipe, and significantly reduces the steam wasted in the condensate drain pipe, thereby solving the technical problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] An air preheater heating steam condensate drain device, comprising:
[0008] A steam box, used for steam collection and secondary heating, has a first pipe valve assembly connected to its upper end and a second pipe valve assembly connected to its bottom.
[0009] A steam trap, used for vapor moisture interception, is connected to the second pipe valve assembly via a gas supply pipe;
[0010] The condensate tank is connected to the air heat exchanger via an air supply pipe.
[0011] As a further technical solution of this utility model, the first pipe valve assembly and the second pipe valve assembly adopt the same structure.
[0012] As a further technical solution of this utility model, both the first pipe valve assembly and the second pipe valve assembly include a direct supply pipe connected to the steam box, and two control ball valves are connected in series on the direct supply pipe, with a pressure regulating valve provided between the two control ball valves.
[0013] As a further technical solution of this utility model, the two ends of the direct supply pipe are also connected to a bypass pipe through a tee pipe, and a bypass ball valve is connected in series on the bypass pipe.
[0014] As a further technical solution of this utility model, the steam box is composed of three boxes connected from top to bottom, and each box has an electric heater fixed inside.
[0015] As a further technical solution of this utility model, a condensate collection net is fixed inside the condensate tank near the second pipe valve assembly.
[0016] As a further technical solution of this utility model, a drain pipe is connected to the bottom of one end of the hydrophobic tank, and a manual butterfly valve is also connected in series on the drain pipe.
[0017] As a further technical solution of this utility model, the air heat exchanger is provided in multiple units and arranged in parallel; a solenoid valve is connected in series on each air supply pipe.
[0018] As a further technical solution of this utility model, the air supply pipe is connected to the heat source inlet of the air heat exchanger, and the heat source outlet of the air heat exchanger is connected to an exhaust pipe.
[0019] Compared with the prior art, the beneficial effects of this utility model are:
[0020] 1. In this utility model, the first pipe valve assembly is connected to the steam drum inside the boiler. The steam generated by the boiler enters the steam box through the first pipe valve assembly, and then enters the condensate tank after passing through the second pipe valve assembly and the gas supply pipe. The high-temperature steam is transported upward and then enters the air heat exchanger through the gas supply pipe to exchange heat with the boiler's gas or water supply, thereby improving the boiler's working efficiency.
[0021] 2. In this utility model, the on / off state of the direct supply pipe can be controlled by controlling the ball valve; the gas pressure can be adjusted by using the pressure regulating valve, and the steam pressure is adjustable and controllable;
[0022] 3. In this utility model, when the valve on the direct supply pipe malfunctions and cannot be opened normally, the bypass ball valve can be opened, and steam will enter the steam box through the bypass pipe, ensuring the normal use of the equipment. Attached Figure Description
[0023] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0024] Figure 2 This utility model Figure 1 A schematic diagram of the bottom side structure.
[0025] Figure 3 This utility model Figure 1 The main view.
[0026] Figure 4 This utility model Figure 1 The left view.
[0027] Figure 5 This utility model Figure 4 AA sectional view.
[0028] In the diagram: 1-First valve assembly, 2-Steam box, 3-Second valve assembly, 4-Gas supply pipe, 5-Drain tank, 6-Gas supply pipe, 7-Solenoid valve, 8-Air heat exchanger, 9-Exhaust pipe, 10-Electric heater, 11-Direct supply pipe, 12-Control ball valve, 13-Pressure regulating valve, 14-Bypass pipe, 15-Bypass ball valve, 16-Drain pipe, 17-Condensate collection screen. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] Please see Figure 1-5 In this embodiment of the utility model, an air preheater heating steam condensate drain device includes...
[0031] Steam box 2, used for steam collection and secondary heating, has a first pipe valve assembly 1 connected to its upper end and a second pipe valve assembly 3 connected to its bottom.
[0032] The condensate tank 5, used for steam moisture interception, is connected to the second pipe valve assembly 3 via the gas supply pipe 4;
[0033] The condensate tank 5 is connected to the air heat exchanger 8 via the air supply pipe 6. The first pipe valve assembly 1 and the second pipe valve assembly 3 are composed of the same structure.
[0034] By adopting the above technical solution, the first valve assembly 1 is connected to the steam drum inside the boiler. The steam generated by the boiler enters the steam box 2 through the first valve assembly 1, and then enters the condensate box 5 after passing through the second valve assembly 3 and the gas supply pipe 4. The high-temperature steam is transported upward and then enters the air heat exchanger 8 through the gas supply pipe 6 to exchange heat with the boiler's gas or water supply, thereby improving the boiler's working efficiency.
[0035] In this embodiment, the first valve assembly 1 and the second valve assembly 3 both include a direct supply pipe 11 connected to the steam box 2. Two control ball valves 12 are connected in series on the direct supply pipe 11, and a pressure regulating valve 13 is provided between the two control ball valves 12.
[0036] By adopting the above technical solution, the on / off state of the direct supply pipe 11 can be controlled by controlling the ball valve 12; the gas pressure can be adjusted by using the pressure regulating valve 13, and the steam pressure is adjustable and controllable.
[0037] In this embodiment, the two ends of the direct supply pipe 11 are also connected to a bypass pipe 14 through a tee pipe, and a bypass ball valve 15 is connected in series on the bypass pipe 14.
[0038] When the valve on the direct supply pipe 11 malfunctions and cannot be opened normally, the bypass ball valve 15 can be opened, and steam will enter the steam box 2 through the bypass pipe 14 to ensure the normal use of the equipment.
[0039] In this embodiment, the steam box 2 is composed of three boxes connected from top to bottom, and each box has an electric heater 10 fixed inside.
[0040] By adopting the above technical solution, in winter, if the steam pipeline has a long transmission distance, the heat loss is large and the preheating effect cannot be achieved. Therefore, an electric heater 10 is installed inside the steam box 2 for secondary heating of the steam, so as to ensure the heat exchange effect of the steam in the air heat exchanger 8.
[0041] In this embodiment, a condensate collection net 17 is fixed inside the condensate tank 5 near the end of the second pipe valve assembly 3.
[0042] By adopting the above technical solution, when steam is discharged into the condensate tank 5, the condensate collection net 17 will collect the condensate generated by the steam, so that the condensate collects in the condensate tank 5, reducing the condensate temperature and reducing heat waste.
[0043] In this embodiment, a drain pipe 16 is connected to the bottom of one end of the condensate tank 5, and a manual butterfly valve is also connected in series on the drain pipe 16.
[0044] By adopting the above technical solution, when there is a lot of condensate in the condensate tank 5, the condensate can be discharged through the drain pipe 16 after opening the manual butterfly valve.
[0045] In this embodiment, multiple air heat exchangers 8 are provided and arranged in parallel; a solenoid valve 7 is connected in series on each air supply pipe 6.
[0046] By adopting the above technical solution, since a solenoid valve 7 is connected in series on each of the air supply pipes 6, the solenoid valves 7 can be opened simultaneously or separately according to actual needs, which facilitates the rational control of the air heat exchanger 8.
[0047] In this embodiment, the air supply pipe 6 is connected to the heat source inlet of the air heat exchanger 8, and the heat source outlet of the air heat exchanger 8 is connected to the exhaust pipe 9. This achieves a steam heating cycle.
[0048] The working principle of this utility model is as follows: The first valve assembly 1 is connected to the steam drum inside the boiler. The steam generated by the boiler enters the steam box 2 through the first valve assembly 1, and then enters the condensate tank 5 after passing through the second valve assembly 3 and the gas supply pipe 4. When the steam is discharged into the condensate tank 5, the condensate collection net 17 will collect the condensate generated by the steam, so that the condensate collects in the condensate tank 5, reducing the condensate temperature and reducing heat waste. Subsequently, the high-temperature steam is transmitted upward and then enters the air heat exchanger 8 through the gas supply pipe 6 to exchange heat with the boiler's gas or water supply, thereby improving the boiler's working efficiency. The on / off of the direct supply pipe 11 can be controlled by the ball valve 12. The gas pressure can be adjusted by the pressure regulating valve 13, and the steam pressure is adjustable and controllable.
[0049] When there is a lot of condensate in the steam trap 5, the condensate can be drained through the drain pipe 16 after opening the manual butterfly valve.
[0050] When the valve on the direct supply pipe 11 malfunctions and cannot be opened normally, the bypass ball valve 15 can be opened, and steam will enter the steam box 2 through the bypass pipe 14 to ensure the normal operation of the equipment. In winter, if the steam pipeline has a long transmission distance, the heat loss will be large and the preheating effect will not be good. Therefore, an electric heater 10 is installed inside the steam box 2 for secondary heating of steam, so as to ensure the heat exchange effect of steam in the air heat exchanger 8.
[0051] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. An air preheater heating steam drain device, characterized by: include Steam box (2), used for steam gathering and secondary heating, has a first pipe valve assembly (1) connected to the upper end and a second pipe valve assembly (3) connected to the bottom. The condensate tank (5), which is used for steam moisture interception, is connected to the second pipe valve assembly (3) through the gas transmission pipe (4); The condensate tank (5) is connected to the air heat exchanger (8) via the air supply pipe (6).
2. The air preheater heating steam drain device of claim 1, wherein: The first pipe valve assembly (1) and the second pipe valve assembly (3) are composed of the same structure.
3. The air preheater heating steam drain device of claim 1, wherein: The first valve assembly (1) and the second valve assembly (3) both include a direct supply pipe (11) connected to the steam box (2), and two control ball valves (12) are connected in series on the direct supply pipe (11), and a pressure regulating valve (13) is provided between the two control ball valves (12).
4. The air preheater heating steam drain device of claim 3, wherein: The two ends of the direct supply pipe (11) are also connected to a bypass pipe (14) through a tee pipe, and a bypass ball valve (15) is connected in series on the bypass pipe (14).
5. The air preheater heating steam drain device of claim 1, wherein: The steam box (2) is composed of three boxes connected from top to bottom, and each box has an electric heater (10) fixed inside.
6. The air preheater heating steam drain device of claim 1, wherein: The condensate trap (5) has a condensate collection net (17) fixed inside the end near the second valve assembly (3).
7. The air preheater heating steam drain device of claim 1, wherein: The bottom of one end of the condensate tank (5) is connected to a drain pipe (16), and a manual butterfly valve is also connected in series on the drain pipe (16).
8. The air preheater heating steam drain device of claim 1, wherein: The air heat exchangers (8) are provided in multiple ways and arranged in parallel; each air supply pipe (6) is connected in series with a solenoid valve (7).
9. The air preheater heating steam drain device of claim 8, wherein: The air supply pipe (6) is connected to the heat source inlet of the air heat exchanger (8), and the heat source outlet of the air heat exchanger (8) is connected to the exhaust pipe (9).