Steam exhaust working medium and heat energy recovery device

Abstract

The utility model discloses a kind of exhaust steam working substance and heat energy recovery device, applied in thermal energy recovery technical field, including scrubbing tower water tank, the top of the scrubbing tower water tank is fixedly connected with exhaust scrubbing tower, one end of the top of the exhaust scrubbing tower is fixedly connected with fixed exhaust steam pipe, the fixed exhaust steam pipe end away from exhaust scrubbing tower is respectively fixedly connected with fixed exhaust steam pipe or heat network exhaust steam output end of fixed exhaust steam pipe.By installing a set of exhaust steam working substance and heat energy recovery device at fixed exhaust steam pipe or heat network exhaust steam port of fixed exhaust steam pipe, mixed heat exchange mode is used in exhaust steam working substance and heat energy recovery device to absorb steam working substance and heat energy, and recovered water is pumped to power plant desalting water system / deaerator, so that fixed exhaust steam pipe and heat network exhaust steam can be effectively recovered, the operation economy of waste incineration power plant and thermal power plant is improved, and the heat network exhaust steam noise can be effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of heat energy recovery technology, and specifically relates to an exhaust working fluid and a heat energy recovery device. Background Technology

[0002] Waste incineration power plants and thermal power plants typically use drum boilers. These boilers require periodic blowdown. The boiler water from the periodic blowdown enters the fixed-discharge expansion tank, where it carries impurities into the fixed-discharge drainage pit. The expanded steam is then discharged into the atmosphere through the exhaust pipe.

[0003] Currently, Chinese utility model patent CN219693402U discloses a device for recovering waste heat and working fluid from exhaust steam in a heating network. However, due to the frequent periodic blowdown operations of existing boilers, and the potential for impurities in the blowdown wastewater, most valves leak before completing a single maintenance cycle. After valve leakage, boiler water continuously leaks into the blowdown expansion vessel, and the exhaust pipe of the expansion vessel continuously discharges large amounts of steam, resulting in significant waste of working fluid and heat energy, while also negatively impacting the public image of waste-to-energy plants and combined heat and power plants. Furthermore, during the operation of the heating network in a combined heat and power plant, when heat users suddenly reduce their steam consumption or experience equipment malfunctions, the boiler's slow adjustment necessitates premature steam venting to avoid boiler overpressure. This venting generates significant noise, has a negative social impact, and results in substantial waste of working fluid and heat energy. Utility Model Content

[0004] The purpose of this invention is to provide a steam working fluid and heat energy recovery device, which solves the problem of recovering the steam working fluid and heat energy discharged from the exhaust pipe of a fixed-discharge expansion vessel, as well as the working fluid and heat energy from the exhaust steam of a thermal power plant, thus addressing the issue of exhaust working fluid and heat energy loss. It has the advantages of effectively recovering exhaust steam from fixed-discharge expansion vessels and thermal power plants, improving the operational economy of waste incineration power plants and thermal power plants, and effectively reducing the noise from thermal power plant exhaust steam.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a steam exhaust working medium and heat energy recovery device, including a scrubbing tower water tank, the top of the scrubbing tower water tank is fixedly connected to an exhaust scrubbing tower, one end of the top of the exhaust scrubbing tower is fixedly connected to a fixed exhaust steam pipe, the end of the fixed exhaust steam pipe away from the exhaust scrubbing tower is fixedly connected to the exhaust steam output end of the fixed exhaust expansion container / heat network, the end of the top of the exhaust scrubbing tower away from the fixed exhaust steam pipe is connected to a desalination cooling water pipe, and the end of the desalination cooling water pipe inside the exhaust scrubbing tower is threadedly connected to a spiral nozzle.

[0006] The above technical solution involves installing a steam working fluid and heat energy recovery device at the exhaust pipe of the fixed-discharge expansion vessel or the exhaust port of the power plant's heating network. This device employs a mixed heat exchange method to absorb the steam working fluid and heat energy, and the recovered water is pumped to the power plant's demineralized water system / deaerator. This effectively recovers exhaust steam from the fixed-discharge expansion vessel and the heating network, improving the operational economy of waste incineration power plants and combined heat and power plants, while also effectively reducing noise from the heating network exhaust. A scrubbing tower is designed based on parameters such as steam flow rate and cooling water flow rate. The scrubbing tower utilizes a mixed heat exchange method to recover steam. Compared to surface heat exchange, the mixed scrubbing tower avoids increasing the resistance of the fixed-discharge expansion vessel's exhaust pipe, preventing the back pressure from rising and ensuring the safe operation of the fixed-discharge expansion vessel by preventing internal pressure from exceeding design values.

[0007] The present invention is further configured such that a recovery water pump is provided on one side of the bottom of the washing tower water tank, and a recovery water pump inlet is provided on the side of the washing tower water tank near the recovery water pump. The washing tower water tank is fixedly connected to the input end of the recovery water pump through the recovery water pump inlet, and the output end of the recovery water pump away from the recovery water pump inlet is fixedly connected to the input end of the demineralized water system / deaerator.

[0008] Using the above technical solution: the water recovered inside the scrubbing tower tank can be pumped to the power plant's demineralized water system / deaerator for treatment by turning on the recovery water pump.

[0009] The present invention is further configured such that an overflow port is opened at the other end of the washing tower water tank away from the inlet of the recycling water pump, and the washing tower water tank is connected to the inside of the pit through the overflow port.

[0010] Using the above technical solution: when the water tank inside the scrubbing tower is full, the excess water can be overflowed into the pit by opening the overflow port.

[0011] The present invention is further provided that a level gauge is bolted to one side of the washing tower water tank, and an inspection window is bolted to the top of the washing tower water tank.

[0012] The above technical solution allows for easy monitoring of the water level inside the scrubbing tower tank by installing a level gauge, facilitating timely opening of the overflow port when full. Simultaneously, removing the inspection window allows access to the top of the scrubbing tower tank for convenient inspection and maintenance.

[0013] The present invention is further configured such that the end of the desalination cooling water pipe away from the interior of the exhaust scrubbing tower and the two ends of the recovery water pump near the scrubbing tower water tank and the demineralized water system / deaerator are both fixedly connected to regulating valves.

[0014] The above technical solution involves installing regulating valves in easily accessible locations on the desalination cooling water pipes and the recovery water pump to balance and regulate the flow rates of the spray water and the recovery water, thereby ensuring stable operation of the equipment.

[0015] The present invention is further configured such that the water tank of the washing tower is made of 10mm steel plate, the exhaust washing tower is made of DN500 welded steel pipe or seamless steel pipe with a thickness of 8mm, and a U-shaped groove with a width of 60mm and a depth of 100mm is opened on the top of the exhaust washing tower for fixing and installing the desalination cooling water pipe.

[0016] The above technical solution facilitates the welding and forming of the scrubbing tower water tank and the exhaust scrubbing tower, thereby improving the structural strength.

[0017] The present invention is further configured such that a ceiling support for use with a fixed steam pipe is provided on one side of the exhaust scrubbing tower, and a 300mm thick concrete foundation is provided at the bottom of the scrubbing tower water tank.

[0018] The above technical solution involves setting up a separate ceiling support to support and fix the steam exhaust pipe, thus avoiding placing the entire weight of the steam exhaust pipe on the water tank.

[0019] The present invention is further configured such that the desalination cooling water pipe and the inlet of the recovery water pump are made of Φ58X3 seamless steel pipe.

[0020] The above technical solution is adopted: the actual installation is carried out according to the site conditions, making it suitable for various installation environments.

[0021] In summary, this utility model has the following beneficial effects: 1. By installing a steam working fluid and heat energy recovery device at the exhaust pipe of the fixed-discharge expansion tank or the exhaust port of the heating network of a combined heat and power plant, the device absorbs the steam working fluid and heat energy through a mixed heat exchange method. The recovered water is pumped to the power plant's demineralized water system / deaerator. This effectively recovers the exhaust steam from the fixed-discharge expansion tank and the heating network, improving the operational economy of waste incineration power plants and combined heat and power plants, while also effectively reducing the noise from the heating network exhaust. 2. The scrubbing tower is designed based on parameters such as steam flow rate and cooling water flow rate. A mixed-type heat exchange method is used within the scrubbing tower to recover steam. Compared to surface heat exchange, the mixed-type scrubbing tower avoids increasing the resistance of the exhaust pipe in the fixed-discharge expansion vessel, thus preventing the back pressure from rising and ensuring the safe operation of the vessel. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of one side of the exhaust scrubbing tower of this utility model; Figure 2This is a cross-sectional view of the exhaust scrubbing tower of this utility model from another side. Figure 3 This is a top view schematic diagram of the exhaust scrubbing tower of this utility model; Figure 4 This is a schematic diagram of the spiral nozzle of this utility model; Figure 5 This is a schematic diagram of the exhaust working fluid and heat energy recovery system of this utility model applied to a constant exhaust expansion tank; Figure 6 This is a schematic diagram of the exhaust working fluid and heat energy recovery system of this utility model applied to the exhaust of a heating network.

[0023] Attached reference numerals: 1. Scrubber water tank; 2. Exhaust scrubber; 3. Continuous steam pipe; 4. Desalination cooling water pipe; 5. Spiral nozzle; 6. Recycle water pump inlet; 7. Overflow port; 8. Level gauge; 9. Ceiling support; 10. Inspection window; 11. Regulating valve. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Example 1: refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6A steam working fluid and heat energy recovery device includes a scrubbing tower tank 1, with an exhaust scrubbing tower 2 fixedly connected to the top of the scrubbing tower tank 1. A fixed exhaust steam pipe 3 is fixedly connected to one end of the top of the exhaust scrubbing tower 2. The end of the fixed exhaust steam pipe 3 away from the exhaust scrubbing tower 2 is fixedly connected to the exhaust steam output end of a fixed exhaust expansion vessel / heating network. A desalination cooling water pipe 4 is connected to the end of the top of the exhaust scrubbing tower 2 away from the fixed exhaust steam pipe 3. A spiral nozzle 5 is threadedly connected to the end of the desalination cooling water pipe 4 inside the exhaust scrubbing tower 2. By installing a steam working fluid and heat energy recovery device at the exhaust pipe of the fixed exhaust expansion vessel or the exhaust port of the heating network of a thermal power plant, the device absorbs the steam working fluid and heat energy using a mixed heat exchange method. The recovered water is pumped to the power plant's demineralized water system / deaerator. This effectively recovers the exhaust steam from the fixed exhaust expansion vessel and the heating network, improving the operational economy of waste incineration power plants and thermal power plants, while also effectively reducing the noise from the heating network exhaust. The scrubbing tower is designed based on parameters such as steam flow rate and cooling water flow rate. A mixed-type heat exchange method is used within the scrubbing tower to recover steam. Compared to surface heat exchange, the mixed-type scrubbing tower avoids the problem of increased resistance in the exhaust pipe of the fixed-discharge expansion vessel, which could lead to increased back pressure in the vessel. This prevents the internal pressure of the fixed-discharge expansion vessel from exceeding the design value, ensuring the safe operation of the vessel. It should be noted that the exhaust scrubbing tower designed in this application needs to be calculated based on the exhaust steam volume and cooling water temperature to meet specific requirements in actual use.

[0026] refer to Figure 2 , Figure 5 , Figure 6 A recovery water pump is installed on one side of the bottom of the scrubbing tower water tank 1. A recovery water pump inlet 6 is located on the side of the scrubbing tower water tank 1 closest to the recovery water pump. The scrubbing tower water tank 1 is fixedly connected to the input end of the recovery water pump via the recovery water pump inlet 6. The output end of the recovery water pump, away from the recovery water pump inlet 6, is fixedly connected to the input end of the demineralized water system / deaerator. The water recovered inside the scrubbing tower water tank 1 can be pumped to the power plant's demineralized water system / deaerator for treatment by activating the recovery water pump.

[0027] refer to Figure 1 , Figure 5 , Figure 6 The washing tower water tank 1 has an overflow port 7 at the other end away from the recycling water pump inlet 6, and the washing tower water tank 1 is connected to the inside of the pit through the overflow port 7. When the washing tower water tank 1 is full, the excess water can be overflowed into the pit by opening the overflow port 7.

[0028] refer to Figure 1 , Figure 3A level gauge 8 is bolted to one side of the washing tower water tank 1, and an inspection window 10 is bolted to the top of the washing tower water tank 1. The level gauge 8 allows for easy observation of the water level inside the washing tower water tank 1, facilitating timely opening of the overflow port 7 when it overflows. Removing the inspection window 10 allows the top of the washing tower water tank 1 to be opened for convenient inspection and maintenance of its interior.

[0029] refer to Figure 2 , Figure 3 , Figure 5 , Figure 6 The desalination cooling water pipe 4, located away from the interior of the exhaust scrubbing tower 2, and the two ends of the recovery water pump, located near the scrubbing tower water tank 1 and the demineralized water system / deaerator, are both fixedly connected to regulating valves 11. The regulating valves 11 are installed on the desalination cooling water pipe 4 and the recovery water pump in easily accessible locations to balance and regulate the flow rates of the spray water and the recovery water, ensuring stable operation of the equipment.

[0030] refer to Figure 1 , Figure 2 The scrubbing tower water tank 1 is made of 10mm steel plate, and the exhaust scrubbing tower 2 is made of DN500 welded steel pipe or seamless steel pipe with a thickness of 8mm. A U-shaped groove with a width of 60mm and a depth of 100mm is opened on the top of the exhaust scrubbing tower 2 for fixing and installing the desalination cooling water pipe 4. This facilitates the welding and forming of the scrubbing tower water tank 1 and the exhaust scrubbing tower 2, and improves the structural strength.

[0031] refer to Figure 1 , Figure 2 A ceiling support 9 is installed on one side of the exhaust scrubbing tower 2 to work in conjunction with the fixed exhaust steam pipe 3, and a 300mm thick concrete foundation is installed at the bottom of the scrubbing tower water tank 1. The ceiling support 9 is installed separately to support and fix the exhaust steam pipe 3, so as to avoid putting all the weight of the fixed exhaust steam pipe 3 on the water tank.

[0032] refer to Figure 2 The desalination cooling water pipe 4 and the recovery water pump inlet 6 are made of Φ58X3 seamless steel pipe. During installation, the desalination cooling water pipe 4 and the recovery water pump inlet 6 can be flexibly arranged and ceiling brackets 9 can be installed according to site conditions. The actual installation is based on site conditions, making it suitable for various installation environments.

[0033] Brief description of the operation: Steam from the fixed-discharge expansion vessel or heating network is transported to the interior of the exhaust gas scrubber 2 via the fixed-discharge steam pipe 3. Desalination cooling water is supplied to the interior of the spiral nozzle 5 via the desalination cooling water pipe 4, and sprayed inside the exhaust gas scrubber 2 through the spiral nozzle 5, allowing it to mix and exchange heat with the steam, absorbing the working fluid and heat energy of the steam. Afterwards, the recovered water in the scrubber's water tank 1 is transported to the power plant's demineralized water system / deaerator by activating the recovery water pump, thus effectively recovering the exhaust steam from the fixed-discharge expansion vessel and the heating network.

[0034] However, it should be noted that: 1. Determination of maximum steam recovery and heat recovery: If applied to steam recovery in a fixed-discharge expansion vessel, historical steam and water loss data and boiler design blowdown data should be collected. The expansion steam volume should be determined based on the steam and water loss data and boiler design blowdown data, and the heat recovery volume should be determined according to the steam enthalpy at 100℃. If applied to steam recovery in a heating network, a suitable steam volume should be selected as the design recovery volume based on daily operation conditions, and the steam enthalpy should be determined based on the operating pressure and temperature of the heating network to finally determine the heat recovery volume.

[0035] 2. Cooling water design flow rate: Determine the heat absorption per unit flow rate of cooling water based on the cooling water inlet temperature and the design temperature of the scrubbing tower water tank 1, and determine the cooling water flow rate based on the heat energy recovery. If used for steam recovery in a fixed-discharge expansion tank, the ratio of steam flow rate to cooling water flow rate can generally be selected as 1:12~15; if used for heating network steam exhaust, specific calculations need to be performed based on the enthalpy value of the heating network steam.

[0036] 3. Selection of Spiral Nozzle 5: The spray angle of spiral nozzle 5 is generally selected as 90°, and the spray shape is a solid cone. The rated flow rate is selected according to 1.15 times the design flow rate of cooling water. If the design flow rate of cooling water is large, spiral nozzle 5 can be set to multiple stages.

[0037] It should be noted that parts have a lifespan and can be replaced during regular maintenance when they no longer meet performance requirements. Deterioration in performance due to prolonged use of parts is not a design defect of this application.

[0038] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A device for recovering exhaust steam working fluid and heat energy, comprising a scrubbing tower water tank (1), characterized in that: The top of the washing tower water tank (1) is fixedly connected to the exhaust washing tower (2), and one end of the top of the exhaust washing tower (2) is fixedly connected to the fixed exhaust steam pipe (3). The end of the fixed exhaust steam pipe (3) away from the exhaust washing tower (2) is fixedly connected to the exhaust steam output end of the fixed exhaust expansion container / heat network. The end of the top of the exhaust washing tower (2) away from the fixed exhaust steam pipe (3) is connected to the desalination cooling water pipe (4), and the end of the desalination cooling water pipe (4) inside the exhaust washing tower (2) is threadedly connected to the spiral nozzle (5).

2. The exhaust working fluid and heat energy recovery device according to claim 1, characterized in that: A recovery water pump is provided on one side of the bottom of the washing tower water tank (1). A recovery water pump inlet (6) is opened on the side of the washing tower water tank (1) near the recovery water pump. The washing tower water tank (1) is fixedly connected to the input end of the recovery water pump through the recovery water pump inlet (6). The output end of the recovery water pump away from the recovery water pump inlet (6) is fixedly connected to the input end of the demineralized water system / deaerator.

3. The exhaust working fluid and heat energy recovery device according to claim 2, characterized in that: The washing tower water tank (1) has an overflow port (7) at the other end away from the inlet (6) of the recycling water pump, and the washing tower water tank (1) is connected to the inside of the pit through the overflow port (7).

4. The exhaust working fluid and heat energy recovery device according to claim 1, characterized in that: A level gauge (8) is bolted to one side of the washing tower water tank (1), and an inspection window (10) is bolted to the top of the washing tower water tank (1).

5. The exhaust working fluid and heat energy recovery device according to claim 2, characterized in that: The desalination cooling water pipe (4) is fixedly connected to a regulating valve (11) at one end away from the interior of the exhaust scrubbing tower (2) and at both ends of the recovery water pump near the scrubbing tower water tank (1) and the demineralized water system / deaerator.

6. The exhaust working fluid and heat energy recovery device according to claim 1, characterized in that: The washing tower water tank (1) is made of 10mm steel plate, and the exhaust washing tower (2) is made of DN500 welded steel pipe or seamless steel pipe with a thickness of 8mm. The top of the exhaust washing tower (2) has a U-shaped groove with a width of 60mm and a depth of 100mm for fixing and installing the desalination cooling water pipe (4).

7. The exhaust working fluid and heat energy recovery device according to claim 1, characterized in that: The exhaust scrubbing tower (2) is provided with a ceiling support (9) on one side for use with the fixed exhaust steam pipe (3), and the bottom of the scrubbing tower water tank (1) is provided with a 300mm thick concrete foundation.

8. The exhaust working fluid and heat energy recovery device according to claim 7, characterized in that: The desalination cooling water pipe (4) and the inlet (6) of the recovery water pump are made of Φ58X3 seamless steel pipe.

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