Re-drying open type condensate water recovery system

Abstract

The utility model relates to a redrying open type condensate water recovery system which comprises a leaf processing line, a stem line processing line, a main steam pipe network, a packed tower, a demineralized water pipeline and a condensate water tank. The packed tower comprises a water inlet main pipe and a water replenishing pipeline; a drain pipeline of the main steam pipe network and a drain pipeline of the blade processing line are converged into one path to be connected into a water inlet mother pipe; a drain pipeline of the stem line processing line is connected into the water inlet main pipe; the demineralized water pipeline is connected into the water supplementing pipeline; the water inlet main pipe is provided with a single-layer ring pipe in the packed tower, and atomizing nozzles are uniformly arranged on the ring pipe at intervals and are used for uniformly releasing condensed water entering the packed tower; the water replenishing pipeline is provided with double layers of ring pipes inside the packed tower, and atomizing nozzles are uniformly arranged on each layer of ring pipe at intervals; the double-layer ring pipe is arranged above the single-layer ring pipe and is used for extinguishing flash steam generated by condensate water in the packed tower; the condensate water tank comprises a water inlet and a water outlet; the lower end of the packed tower is connected with a condensate tank water inlet. And the utilization efficiency of energy resources is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of condensate recovery systems for re-drying process equipment, and in particular to an open-type condensate recovery system for re-drying. Background Technology

[0002] The re-drying production process is mainly divided into leaf processing line and stem processing line. The equipment that uses steam in the leaf processing line mainly includes leaf moistening machine, enzyme adding machine, leaf roasting machine, and feeding machine. The equipment that uses steam in the stem processing line mainly includes stem roasting machine, heating and humidifying machine, stem feeding machine, fragment dryer, and leaf moistening machine.

[0003] After heat exchange, steam produces high-temperature condensate. This condensate passes through a steam trap assembly and then enters an open-loop condensate recovery system to eliminate flash steam before being returned to the boiler room for reuse. This achieves the recovery and utilization of waste heat and energy, resulting in efficient energy use and energy conservation and emission reduction. Currently, there is no unified management of condensate recovery in the re-drying production process; each piece of equipment handles its own condensate independently, leading to significant energy waste. Therefore, an open-loop condensate recovery system needs to be designed to centrally recover condensate from the blade processing line, stem processing line, and main steam pipeline network.

[0004] Open-loop condensate recovery systems typically include packed towers because the condensate contains heat, and the packed tower facilitates heat exchange during the recovery process. Furthermore, the condensate may contain impurities such as trace metal ions, organic matter, or fine particles generated during production; the packed tower can serve as a preliminary water purification device. Additionally, the condensate may contain some gaseous components during recovery, and the packed tower helps achieve gas-liquid separation. When the condensate enters the packed tower, the gas gradually separates from the liquid under the action of the packing material. However, when the condensate temperature is too high, flash vapor may be generated in the packed tower; this flash vapor loses some heat as it passes through the tower. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a re-boiling open-type condensate recovery system. This system recovers condensate generated from blade processing lines, stem processing lines, and the main steam pipeline network. Flash steam generated by the condensate enters a packed tower and is cooled and eliminated by demineralized water spray. The condensate temperature inside the condensate tank is controlled at 90°C. The condensate is ultimately pumped back to the boiler room in a single-phase flow for boiler feedwater use, avoiding water hammer caused by two-phase steam. Specifically, the technical solution of this utility model to achieve the above objectives is as follows:

[0006] A reheating open-type condensate recovery system includes:

[0007] Blade processing line, stem processing line, main steam pipeline network, packed tower, demineralized water pipeline and condensate tank;

[0008] The packed tower includes an inlet header and a makeup water pipeline; the condensate drain pipe of the main steam network and the condensate drain pipe of the blade processing line merge into one line and connect to the inlet header; the condensate drain pipe of the stem processing line connects to the inlet header; the demineralized water pipeline connects to the makeup water pipeline; a single-layer ring pipe is installed inside the packed tower, and atomizing nozzles are evenly spaced on the ring pipe for uniformly releasing the condensate entering the packed tower; a double-layer ring pipe is installed inside the packed tower, and atomizing nozzles are evenly spaced on each ring pipe; the double-layer ring pipe is installed above the single-layer ring pipe for extinguishing flash steam generated by the condensate in the packed tower.

[0009] The condensate tank includes an inlet and an outlet; the lower end of the packing tower is connected to the inlet of the condensate tank.

[0010] Furthermore, the single-layer ring tube is evenly spaced and equipped with sixteen atomizing nozzles, each with a nozzle orifice diameter of 5mm.

[0011] Furthermore, each layer of the double-layer ring tube is evenly spaced with sixteen atomizing nozzles; the upper layer nozzle has a diameter of 1mm and the lower layer nozzle has a diameter of 3mm.

[0012] Furthermore, an atmospheric communication pipe is provided at the top of the packed tower; the packing layer inside the packed tower includes a stainless steel Pall ring layer and a manganese sand layer; a maintenance pipe is provided in the tower body, and an end cap is provided at the end of the maintenance pipe; the maintenance pipe body is inclined upwards towards the end along the position where it is connected to the packed tower.

[0013] Furthermore, the condensate tank is equipped with a magnetic level gauge, an overflow pipe, a radar level gauge, a temperature sensor, and a vent valve; the magnetic level gauge is connected to the condensate tank body via two interfaces of different heights through ball valves, and a vent ball valve is installed at the bottom of the magnetic level gauge; the overflow pipe is equipped with a shut-off valve and a drain valve; the vent valve is installed at the bottom of the condensate tank, and a constant pressure electric pump unit is connected to the outlet.

[0014] Furthermore, the constant pressure electric pump unit includes two identical branch pipelines connected in parallel and a main pipeline formed by merging the branch pipelines. The branch pipelines are respectively equipped with a shut-off valve, a variable frequency water pump, a pressure gauge, a check valve, and a shut-off valve; the main pipeline is equipped with a pressure sensor and a flow meter.

[0015] Furthermore, the leaf processing line includes a leaf moistening machine, an enzyme adding machine, a feeding machine, and a leaf roasting machine with five sets of drainage valves, each equipped with a set of drainage valves; the stem processing line includes a heating and humidifying machine, a stem feeding machine, a fragment dryer, a leaf moistening machine, and a stem roasting machine with five sets of drainage valves, each equipped with a set of drainage valves.

[0016] Furthermore, the steam trap assembly includes a shut-off valve, a sight glass, a check valve, and a steam trap.

[0017] Furthermore, a shut-off valve is installed after the main steam pipeline and the blade processing line drain line merge into one; a shut-off valve is installed on the stem processing line; and a shut-off valve and an electric regulating valve are installed on the demineralized water pipeline.

[0018] The condensate from the main steam pipeline 3 and the condensate from the blade processing line 1 are combined into one line and connected to the condensate inlet header 41 of the packed tower 4. The condensate from the stem processing line 2 is separately combined into one line and connected to the condensate inlet header 41 of the packed tower 4. Both condensate lines are equipped with shut-off valves before entering the condensate header of the packed tower 4. The condensate enters the packed tower 4 through the header. Several nozzles are installed on the single-layer ring pipe 42 to atomize the condensate, which then flows downwards to fully contact the packing material. Ambient temperature demineralized water is connected to the packed tower 4 through a makeup water pipeline. A shut-off valve and an electric regulating valve are installed on the demineralized water pipeline 5. After entering the packed tower 4, several nozzles are installed on the double-layer ring pipe 43 to form a demineralized water mist. The demineralized water mist fully contacts the flash steam generated by the condensate, forming a spray cooling effect that extinguishes the flash steam. The demineralized water inside the packed tower 4 consists of a double-layered ring pipe 43, with sixteen atomizing nozzles installed in each layer. The upper layer nozzle has an orifice diameter of 1 mm, and the lower layer nozzle has an orifice diameter of 3 mm. This double-layered atomization is more conducive to extinguishing flash steam. The condensate inside the packed tower 4 consists of a single-layered ring pipe 42, with sixteen atomizing nozzles installed in each layer. The nozzle orifice diameter is 5 mm, which is conducive to the uniform release of condensate in the packed tower 4.

[0019] Condensate and demineralized water pass together through the packing material inside the packed tower 4 before entering the condensate tank 6. The packing material consists of stainless steel Pall rings and manganese sand. The stainless steel Pall rings have excellent corrosion resistance, and their surface has numerous openings and channels. This allows the condensate and demineralized water to form complex turbulence as they pass through the packing layer, greatly increasing the contact area between the fluid and the packing material, thereby improving mass transfer efficiency. When water flows through the manganese sand filter layer, contact oxidation, biochemical reactions on the filter media surface, and physical trapping and adsorption occur, causing iron and manganese ions in the water to precipitate and be removed. The packed tower 4 is equipped with maintenance pipes 45 for loading, unloading, and removing the packing material for cleaning.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The condensate from the re-drying process equipment and steam pipeline is transported to the condensate recovery unit via a condensate tank and a packed tower. The unit extinguishes flash steam in the condensate through a demineralized water spray cooling process, simultaneously removing iron ions from the water. All sensible heat in the condensate and the latent heat of vaporization of the flash steam are recovered and utilized. Compared to traditional open condensate systems, this system ensures smooth condensate discharge from process equipment while also recovering flash steam waste heat, avoiding energy waste and environmental pollution caused by flash steam discharge. It achieves complete heat recovery from the condensate, improving energy resource utilization efficiency and realizing energy conservation and emission reduction. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the system connection described in this utility model;

[0023] Figure 2 This is a schematic diagram of the blade processing line connection described in this utility model;

[0024] Figure 3 This is a schematic diagram of the connection of the wire processing line described in this utility model;

[0025] Figure 4 This is a schematic diagram of the packed tower structure described in this utility model;

[0026] Figure 5 This is a cross-sectional view of the packed tower described in this utility model;

[0027] In the picture:

[0028] 1—Leaf processing line, 11—Leaf moistening machine, 12—Enzyme adding machine, 13—Feeding machine, 14—Leaf baking machine;

[0029] 2—Stem processing line, 21—Heating and humidifying machine, 22—Stem feeder, 23—Fragment dryer, 24—Leaf moistening machine

[0030] Machine, 25—Stem roaster;

[0031] 3—Main steam pipeline network;

[0032] 4—Packed tower; 41—Inlet header; 42—Single-layer ring pipe; 43—Double-layer ring pipe; 44—Atmospheric connection pipe.

[0033] 45—Maintaining pipelines;

[0034] 5—Demineralized water pipeline;

[0035] 6—Condensate tank, 61—Magnetic level gauge, 62—Overflow pipe, 63—Radar level gauge, 64—Temperature sensor

[0036] Sensors, 65—vent valve, 66—constant pressure electric pump unit, 661—pressure sensor, 662—flow meter. Detailed Implementation

[0037] like Figure 1-5 The embodiments of this utility model are as follows:

[0038] A reheating open-type condensate recovery system includes:

[0039] 1. Blade processing line; 2. Stem processing line; 3. Main steam pipeline network; 4. Packed tower; 5. Demineralized water pipeline; and 6. Condensate tank.

[0040] The packed tower 4 includes an inlet header 41 and a makeup water pipeline; the drain pipe of the main steam network 3 merges with the drain pipe of the blade processing line 1 and connects to the inlet header 41; the drain pipe of the stem processing line 2 connects to the inlet header 41; the blade processing line 1 includes a leaf humidifier 2411 (each equipped with a set of drain valves), an enzyme adder 12, and a feeder 13) and a blade roaster 14 (equipped with five sets of drain valves); the stem processing line 2 includes a heating and humidifying machine 21 (each equipped with a set of drain valves), a stem feeder 2213, a scrap dryer 23, a leaf humidifier 2411, and a stem roaster 25 (equipped with five sets of drain valves). The drain valve set includes a shut-off valve, a sight glass, a check valve, and a drain valve.

[0041] The demineralized water pipeline 5 connects to the makeup water pipeline. The condensate drain pipes of the main steam network 3 and the blade processing line 1 merge into one line and are equipped with a shut-off valve; the stem processing line 2 is equipped with a shut-off valve; the demineralized water pipeline 5 is equipped with a shut-off valve and an electric regulating valve. A single-layer ring pipe 42 is installed inside the packed tower 4 on the inlet header 4. Atomizing nozzles are evenly spaced on the ring pipe to evenly release the condensate entering the packed tower 4. The single-layer ring pipe 42 has sixteen atomizing nozzles evenly spaced, with a nozzle orifice diameter of 5mm. The makeup water pipeline is installed inside the packed tower 4 with a double-layer ring pipe 43. Each layer of the ring pipe has evenly spaced atomizing nozzles; each layer of the double-layer ring pipe 43 has sixteen atomizing nozzles evenly spaced; the upper layer nozzle orifice diameter is 1mm, and the lower layer nozzle orifice diameter is 3mm. A double-layer ring pipe 43 is installed above a single-layer ring pipe 42 to extinguish flash vapor generated by condensate in the packed tower 4; an atmospheric connection pipe 44 is provided at the top of the packed tower 4 to ensure that the internal pressure of the condensate recovery device is consistent with the atmospheric pressure, thereby forming an open condensate recovery system; the packing layer inside the packed tower 4 includes a stainless steel Pall ring layer and a manganese sand layer; a maintenance pipe 45 is provided in the tower body of the packed tower 4, and an end cap is provided at the end of the maintenance pipe 45; the pipe body of the maintenance pipe 45 is inclined upwards towards the end along the connection position with the packed tower 4.

[0042] The condensate tank 6 includes an inlet, an outlet, a magnetic level gauge 61, an overflow pipe 62, a radar level gauge 63, a temperature sensor 64, and a vent valve 65. The lower end of the packed tower 4 is connected to the inlet of the condensate tank 6. The magnetic level gauge 61 is connected to the condensate tank 6 via two ports of different heights through ball valves. A vent ball valve is installed at the bottom of the magnetic level gauge 61 for flushing. The overflow pipe 62 is equipped with a shut-off valve and a drain valve; these serve to prevent steam from escaping and to drain water, thus preventing the condensate tank 6 from overflowing. The vent valve 65 is installed at the bottom of the condensate tank 6 for draining and venting condensate. A constant pressure electric pump unit 66 is connected to the outlet. The constant pressure electric pump unit 66 includes two identical branch pipelines connected in parallel and a main pipeline formed by merging the branch pipelines. The branch pipelines are respectively equipped with a shut-off valve, a variable frequency water pump, a pressure gauge, a check valve, and a shut-off valve. The main pipeline is equipped with a pressure sensor 661 and a flow meter 662.

[0043] The condensate from the main steam pipeline 3 and the condensate from the blade processing line 1 are combined into one line and connected to the condensate inlet header 41 of the packed tower 4. The condensate from the stem processing line 2 is separately combined into one line and connected to the condensate inlet header 41 of the packed tower 4. Both condensate lines are equipped with shut-off valves before entering the condensate header of the packed tower 4. The condensate enters the packed tower 4 through the header. Several nozzles are installed on the single-layer ring pipe 42 to atomize the condensate, which then flows downwards to fully contact the packing material. Ambient temperature demineralized water is connected to the packed tower 4 through a makeup water pipeline. A shut-off valve and an electric regulating valve are installed on the demineralized water pipeline 5. After entering the packed tower 4, several nozzles are installed on the double-layer ring pipe 43 to form a demineralized water mist. The demineralized water mist fully contacts the flash steam generated by the condensate, forming a spray cooling effect that extinguishes the flash steam.

[0044] Condensate and demineralized water pass together through the packing material inside the packed tower 4 before entering the condensate tank 6. The packing material consists of stainless steel Pall rings and manganese sand. The stainless steel Pall rings have excellent corrosion resistance, and their surface has numerous openings and channels. This allows the condensate and demineralized water to form complex turbulence as they pass through the packing layer, greatly increasing the contact area between the fluid and the packing material, thereby improving mass transfer efficiency. When water flows through the manganese sand filter layer, contact oxidation, biochemical reactions on the filter media surface, and physical trapping and adsorption occur, causing iron and manganese ions in the water to precipitate and be removed. The packed tower 4 is equipped with maintenance pipes 45 for loading, unloading, and removing the packing material for cleaning.

[0045] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A reheating open-type condensate recovery system, characterized in that, include: Blade processing line (1), stem processing line (2), main steam pipeline (3), packed tower (4), demineralized water pipeline (5) and condensate tank (6); The packed tower (4) includes an inlet header (41) and a makeup water pipeline; the drainage pipeline of the main steam network (3) and the drainage pipeline of the blade processing line (1) merge into one line and are connected to the inlet header (41); the drainage pipeline of the stem processing line (2) is connected to the inlet header (41); the demineralized water pipeline (5) is connected to the makeup water pipeline; a single-layer ring pipe (42) is installed inside the packed tower (4) of the inlet header (41), and atomizing nozzles are evenly spaced on the ring pipe for uniformly releasing the condensate entering the packed tower (4); a double-layer ring pipe (43) is installed inside the packed tower (4), and atomizing nozzles are evenly spaced on each ring pipe; the double-layer ring pipe (43) is installed above the single-layer ring pipe (42) for extinguishing the flash steam generated by the condensate in the packed tower (4); The condensate tank (6) includes an inlet and an outlet; the lower end of the packing tower (4) is connected to the inlet of the condensate tank (6).

2. The reheating open-type condensate recovery system as described in claim 1, characterized in that: The single-layer ring pipe (42) is equipped with sixteen atomizing nozzles at uniform intervals, with a nozzle orifice diameter of 5mm.

3. The reheating open-type condensate recovery system as described in claim 1, characterized in that: The double-layer ring tube (43) is equipped with sixteen atomizing nozzles at uniform intervals in each layer; the upper nozzle has a diameter of 1 mm and the lower nozzle has a diameter of 3 mm.

4. The reheating open-type condensate recovery system as described in claim 1, characterized in that: The top of the packed tower (4) is provided with an atmospheric communication pipe (44); the packing layer inside the packed tower (4) includes a stainless steel Pall ring layer and a manganese sand layer; the packed tower (4) has a maintenance pipe (45) on its body, and the end of the maintenance pipe (45) is provided with an end cap; the body of the maintenance pipe (45) is inclined upwards towards the end along the position where it is connected to the packed tower (4).

5. The reheating open-type condensate recovery system as described in claim 1, characterized in that: The condensate tank (6) is equipped with a magnetic float level gauge (61), an overflow pipe (62), a radar level gauge (63), a temperature sensor (64), and a vent valve (65). The magnetic float level gauge (61) is connected to the condensate tank (6) by two interfaces of different heights through ball valves. A vent ball valve is installed at the bottom of the magnetic float level gauge (61). The overflow pipe (62) is equipped with a shut-off valve and a drain valve. The vent valve (65) is installed at the bottom of the condensate tank (6). The outlet is connected to a constant pressure electric pump unit (66).

6. The reheating open-type condensate recovery system as described in claim 5, characterized in that: The constant pressure electric pump unit (66) includes two identical branch pipelines connected in parallel and a main pipeline formed by merging the branch pipelines. The branch pipelines are respectively equipped with a shut-off valve, a variable frequency water pump, a pressure gauge, a check valve and a shut-off valve; the main pipeline is equipped with a pressure sensor (661) and a flow meter (662).

7. The reheating open-type condensate recovery system as described in claim 1, characterized in that: The leaf processing line (1) includes a leaf moistening machine (24)(11) each equipped with a set of drain valves, an enzyme adding machine (12), a feeding machine (13), and a leaf roasting machine (14) equipped with five sets of drain valves; the stem processing line (2) includes a heating and humidifying machine (21) each equipped with a set of drain valves, a stem feeding machine (22)(13), a fragment dryer (23), a leaf moistening machine (24)(11), and a stem roasting machine (25) equipped with five sets of drain valves.

8. The reheating open-type condensate recovery system as described in claim 7, characterized in that: The steam trap assembly includes a shut-off valve, a sight glass, a check valve, and a steam trap.

9. The reheating open-type condensate recovery system as described in claim 1, characterized in that: The drain pipe of the main steam pipeline (3) and the drain pipe of the blade processing line (1) are connected to form a single line and are equipped with a shut-off valve; the stem processing line (2) is equipped with a shut-off valve; the demineralized water pipeline (5) is equipped with a shut-off valve and an electric regulating valve.

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