Condensate water recovery device for redrying process

Abstract

The utility model discloses a redrying process condensate water recovery device which comprises a heat exchanger and a condensate water tank, the heat exchanger is installed on the top of the condensate water tank in a skid-mounted mode, and the condensate water tank is provided with a high-temperature condensate water inlet, a condensate water tank flash steam outlet, a condensate water tank hot water inlet and a condensate water tank water outlet. A heat exchanger cooling water inlet, a heat exchanger flash steam inlet, a heat exchanger flash steam condensed water outlet and a heat exchanger cooling water outlet are formed in the heat exchanger; a flash steam condensed water outlet of the heat exchanger is connected to the lower part of the condensed water tank through a condensed water pipe, and a cooling water outlet of the heat exchanger is connected with a hot water inlet of the condensed water tank. The device can effectively eliminate flash steam formed after high-temperature condensate water enters the condensate water tank, the flash steam is condensed in a heat exchange mode and then enters the condensate water tank together with cooling water to be mixed with the high-temperature condensate water, and comprehensive recycling of the high-temperature condensate water, heat exchange cooling water and flash steam condensate water is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of condensed water in a redrying thermal system process, and in particular to a condensed water recovery device for a redrying process. Background Art

[0002] The core equipment using steam in the re-roasting process mainly includes hot air leaf moistening machine, leaf roasting machine, stem roasting machine, feeder, chip dryer, etc. After steam heat exchange recovery, high-temperature condensate will be generated. The high-temperature condensate will release flash steam due to the pressure drop inside the condensate tank, and steam and water will be formed in the water tank. If the flash steam is not eliminated, there will be pressure in the water tank. On the one hand, it will hinder the discharge of condensate from the equipment and affect the process indicators. On the other hand, the steam and water will cause cavitation in the water pump, affecting the downstream transportation. Water hammer will inevitably occur in the process of transporting the condensate back to the boiler room.

[0003] CN219120758U discloses a device for utilizing waste heat from secondary flash steam. By installing a heat exchanger, the device uses the latent heat of the secondary flash steam to preheat the return water from the air conditioning system, reducing energy waste and significantly saving steam consumption in the air conditioning system's steam-water heat exchanger. Furthermore, condensed water generated during the preheating process is collected in a condensate recovery tank and pumped through a water pump to a deironing device for iron removal before being used as boiler water. This not only saves steam consumption in the air conditioning system but also reduces boiler soft water consumption, achieving the goal of energy conservation and consumption reduction.

[0004] Since flash steam is usually generated by the release of high-temperature condensate due to pressure drop inside the condensate tank, the above patent requires an additional condensate recovery tank to recycle the condensate, and it cannot be directly collected in the original condensate tank. Utility Model Content

[0005] In response to the above problems, the utility model provides a condensate recovery device for the re-roasting process, which condenses the flash steam through a heat exchanger to eliminate the flash steam, and sends the condensed flash steam condensate and the heat exchanger cooling water (about 80°C) into a condensate water tank, where they are mixed with the high-temperature condensate (about 130°C) generated by the re-roasting equipment, forming condensate at about 90°C in the condensate water tank for use by downstream equipment, thereby ensuring efficient recovery of condensate from the re-roasting process.

[0006] Specifically, the utility model provides a condensate recovery device for a redrying process, comprising: a heat exchanger and a condensate tank, wherein the condensate tank is provided with a high-temperature condensate inlet, and the condensate from the redrying process enters the condensate tank through the high-temperature condensate inlet;

[0007] The heat exchanger is skid-mounted on the top of the condensate tank. The top of the condensate tank is provided with: a flash steam outlet for the condensate tank, a hot water inlet for the condensate tank, and a water outlet for the condensate tank at the bottom.

[0008] The bottom of the heat exchanger is provided with a heat exchanger cooling water inlet, a heat exchanger flash steam inlet and a heat exchanger flash steam condensate outlet, and the top is provided with a heat exchanger cooling water outlet;

[0009] The heat exchanger is provided with a condensing assembly, which is a double condensing module structure with an upper and a lower condensing module. The upper and lower condensing modules are connected, the lower condensing module is connected to the cooling water inlet of the heat exchanger, and the upper condensing module is connected to the cooling water outlet of the heat exchanger;

[0010] The flash steam outlet of the condensing water tank is connected to the flash steam inlet of the heat exchanger, the flash steam condensate outlet of the heat exchanger is connected to the lower part of the condensing water tank through the condensing water pipe, and the cooling water outlet of the heat exchanger is connected to the hot water inlet of the condensing water tank.

[0011] Furthermore, the heat exchanger is provided with a plurality of vertically arranged baffles, which are staggered to form a condensation channel for flash steam to pass through in the heat exchanger, and a notch is provided at the bottom of the lower baffle to allow the flash steam to flow after condensation.

[0012] Furthermore, the condensing module is composed of a plurality of heat exchange tubes, and three adjacent heat exchange tubes are arranged in an equilateral triangle.

[0013] Furthermore, the condensate water tank is provided with a condensate water tank exhaust port, and the heat exchanger is provided with a heat exchanger exhaust port.

[0014] Furthermore, the condensation water tank is provided with a pressure sensor, a temperature sensor and a liquid level gauge.

[0015] Furthermore, an overflow pipe is provided at the upper portion of the condensation water tank. The overflow pipe is located inside the condensation water tank and extends downward to the bottom of the condensation water tank.

[0016] Furthermore, a condensate vortex preventer is installed at the water outlet of the condensate tank.

[0017] Working principle:

[0018] In the redrying process, high-temperature condensate enters the condensate tank 1 through two condensate inlets 1a. The high-temperature condensate releases flash steam due to the pressure drop inside the condensate tank 1, forming steam-water in the tank. The flash steam is connected to the flash steam inlet 2b of the heat exchanger through the flash steam outlet 1b of the condensate tank. The normal-temperature desalted water enters the condensation module inside the heat exchanger through the cooling water inlet 2a of the heat exchanger. The cooling water flows through the condensation module tube layer inside the heat exchanger, and the flash steam flows through the shell layer of the heat exchanger. The flash steam moves along the condensation channel formed by the baffle 2g, which helps to extend the heat exchange time between the flash steam and the cooling water. In addition, the heat exchanger 2 has a low-resistance design (the low-resistance design refers to the shell layer. The flash steam has a large flow area in the shell layer, so the resistance is small, and the pressure loss is naturally small). In the event of a cold source interruption, the full flow resistance of the flash steam in the shell layer does not exceed 5kPa (the low shell resistance means low pressure loss, which will not cause the condensate to be blocked due to excessive pressure loss, thereby causing poor condensate discharge in the redrying process equipment, ultimately affecting the quality of steam-cured tobacco leaves).

[0019] After sufficient heat exchange between the cooling water and the flash steam, the flash steam turns into condensate. This condensate is then connected to the condensate pipe 1c via the flash steam condensate outlet 2c of the heat exchanger. This condensate pipe 1c flows into the bottom of the condensate tank to prevent water hammer caused by contact with the flash steam at the top of the condensate tank 1. After heat exchange, the ambient temperature cooling water becomes hot water at approximately 80°C and is connected to the hot water inlet 1n of the condensate tank from the cooling water outlet 2d of the heat exchanger. The 80°C hot water in the condensate tank hot water inlet 1n mixes with the process condensate to form 90°C condensate in the condensate tank. Two condensate outlets 1d are provided at the bottom of the condensate tank 1, through which the water can be connected to downstream processing steps.

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

[0021] (1) The condensate recovery device for the re-roasting process provided by the utility model can effectively eliminate the flash steam formed after the high-temperature condensate generated by the re-roasting equipment enters the condensate water tank, and condenses the flash steam through heat exchange and enters the condensate water tank together with the cooling water to mix with the high-temperature condensate, thereby realizing the comprehensive recovery and utilization of high-temperature condensate water, heat exchange cooling water, and flash steam condensate water.

[0022] (2) The heat exchanger adopts a single-shell double-tube design and is equipped with multiple staggered baffles inside, which helps to extend the heat exchange time between flash steam and cooling water and improve heat exchange efficiency.

[0023] (3) The flash steam condensate pipe is directly inserted into the bottom of the condensate tank to avoid contact with the steam in the upper part of the tank and thus avoid water hammer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of the condensed water recovery device for the redrying process in Example 1;

[0025] Figure 2 is a cross-sectional view of the heat exchanger in Example 1;

[0026] Figure 3 Schematic diagram of the flow of cooling water and flash steam inside the heat exchanger in Example 1;

[0027] Figure 4 This is a schematic diagram of the condensed water recovery device for the redrying process in Example 1.

[0028] Reference numerals:

[0029] 1-Condensate tank; 1a-High-temperature condensate inlet; 1b-Condensate tank flash steam outlet; 1c-Condensate pipe; 1d-Condensate tank outlet; 1e-Condensate tank exhaust port; 1f-Overflow pipe; 1g-Drain outlet; 1h-Level gauge interface; 1i-Temperature sensor interface; 1j-Pressure gauge interface; 1k-Pressure transmitter interface; 1l-Condensate swirl preventer; 1n-Condensate tank hot water inlet; 2-Heat exchanger; 2a-Heat exchanger cooling water inlet; 2b-Heat exchanger flash steam inlet; 2c-Heat exchanger flash steam condensate outlet; 2d-Heat exchanger cooling water outlet; 2e-Heat exchanger exhaust port; 2f-Heat exchange tube; 2g-Baffle; 3-Saddle. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below through specific implementations in conjunction with the accompanying drawings.

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment provides a condensate recovery device for a redrying process, comprising a heat exchanger 2 and a condensate tank 1. The heat exchanger 2 is skid-mounted on top of the condensate tank 1 via a saddle 3, ensuring a compact structure for the recovery device and shortening the installation distance of the flash steam pipe to reduce resistance. The condensate tank 1 is provided with two high-temperature condensate inlets 1a, through which high-temperature condensate from the redrying process equipment enters the condensate tank 1.

[0033] The condensate tank is equipped with a flash steam outlet 1b, a hot water inlet 1n, a vent 1e, a condensate pipe 1c, a condensate outlet 1d, and a sewage outlet 1g. The flash steam outlet 1b is connected to the flash steam inlet 2b of the heat exchanger, and the flash steam condensate outlet 2c is connected to the condensate pipe 1c. Flash steam generated in the condensate tank 1 enters the shell of the heat exchanger 2 through the flash steam inlet 2b.

[0034] A condensation assembly is provided inside the heat exchanger 2. The condensation assembly is a double condensation module structure with an upper and lower condensation module. The upper and lower condensation modules are connected. The lower condensation module is connected to the heat exchanger cooling water inlet 2a, and the upper condensation module is connected to the heat exchanger cooling water outlet 2d. The heat exchanger cooling water uses normal temperature desalted water. It enters the lower condensation module from the heat exchanger cooling water inlet 2a at the lower left of the heat exchanger 2, goes around to the right end, makes a 180-degree bend, enters the upper condensation module, and then flows from the upper left heat exchanger cooling water outlet 2d to the condensation water tank hot water inlet 1n, and finally enters the condensation water tank 1.

[0035] like Figure 4 As shown, after flash steam (approximately 130°C) enters the shell of heat exchanger 2, it exchanges heat with the condensing assembly, condensing into condensate. This condensate flows out of the heat exchanger's flash steam condensate outlet 2c and is then connected to the bottom of condensate tank 1 via condensate pipe 1c. This allows the flash steam to condense and return while avoiding contact with the steam and flash steam condensate in the upper part of the condensate tank, thus preventing water hammer. Room-temperature cooling water exchanges heat with the flash steam, forming hot water at approximately 80°C. This hot water flows into condensate tank 1 through the condensate tank's hot water inlet 1n, mixing with the high-temperature condensate and flash steam condensate within the condensate tank 1 to form condensate at approximately 90°C. This condensate is then connected to the downstream processing step via the condensate tank outlet 1d, effectively recycling the heat from the flash steam.

[0036] like Figure 2-3 As shown, the heat exchanger 2 is provided with a plurality of vertically arranged baffles 2g, and the baffles are arranged in a staggered manner so that a condensation channel for flash steam to pass through is formed in the heat exchanger 2. At the same time, the baffles 2g also serve to support the heat exchange tubes. A notch is provided at the bottom of the lower baffle 2g to allow the flash steam to flow after condensation. The upper and lower condensation modules are each composed of a plurality of heat exchange tubes 2f. The three adjacent heat exchange tubes 2f are arranged in a regular triangle. The arrangement is compact, and more heat exchange tubes 2f can be arranged on the same tube sheet area, and the heat transfer effect is good. In this embodiment, the upper and lower condensation modules are arranged in 9 layers, with a total of 214 heat exchange tubes 2f. The 1st to 9th layers are respectively arranged with 5, 8, 11, 10, 13, 14, 15, 16, and 15 heat exchange tubes 2f. The specifications of the heat exchange tubes 2f are φ19×1.5, and the total heat exchange area is 25m 2 , by increasing the heat exchange area and extending the heat exchange time to improve the heat exchange efficiency.

[0037] A condensate tank steam exhaust port 1e is located at the top of the condensate tank 1 to partially discharge steam and prevent excessive pressure within the tank. A pressure gauge port 1j and a pressure transmitter port 1k are also located at the top of the condensate tank 1, for installing a pressure gauge and a pressure sensor, respectively, to monitor the real-time pressure within the condensate tank 1. A heat exchanger exhaust port 2e is located at the top of the heat exchanger 2 to discharge any residual non-condensable gases.

[0038] Condensate tank 1 is equipped with two temperature sensor interfaces 1i and a liquid level gauge interface 1h. The temperature sensor interface 1i is used to install a temperature sensor to monitor the temperature of the flash steam at the top and the condensed water at the bottom of the tank. The liquid level gauge interface is used to install a liquid level gauge, which can monitor the water level in the condensate tank in real time.

[0039] An overflow pipe 1f is provided on the upper part of the condensed water tank 1. Since the condensed water in the condensed water tank 1 is still around 90°C, in order to ensure the completeness of the overflow, the outlet of the overflow pipe 1f is directed towards.

[0040] A condensate vortex preventer 11 is installed at the water outlet 1d of the condensate tank. The condensate vortex preventer 11 can prevent the formation of a vortex at the water outlet and carry gas into the water pump, thereby stabilizing the water outlet and protecting the water pump.

[0041] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art of the present invention can make some simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. A condensed water recovery device for a redrying process, comprising: A heat exchanger (2) and a condensed water tank (1), wherein the condensed water tank (1) is provided with a high-temperature condensed water inlet (1a), and condensed water from the double-baking process enters the condensed water tank (1) through the high-temperature condensed water inlet (1a); characterized in that: The heat exchanger (2) is skid-mounted on the top of the condensate tank (1); the top of the condensate tank (1) is provided with: a condensate tank flash steam outlet (1b), a condensate tank hot water inlet (1n), and the bottom is provided with a condensate tank water outlet (1d); The heat exchanger (2) is provided with a heat exchanger cooling water inlet (2a), a heat exchanger flash steam inlet (2b) and a heat exchanger flash steam condensate outlet (2c) at the bottom, and a heat exchanger cooling water outlet (2d) at the top; The heat exchanger (2) is provided with a condensation assembly inside, and the condensation assembly is a double condensation module structure with an upper and a lower condensation module. The upper and lower condensation modules are connected, the lower condensation module is connected to the heat exchanger cooling water inlet (2a), and the upper condensation module is connected to the heat exchanger cooling water outlet (2d); The flash steam outlet (1b) of the condensing water tank is connected to the flash steam inlet (2b) of the heat exchanger, the flash steam condensate outlet (2c) of the heat exchanger is connected to the lower part of the condensing water tank (1) through the condensate pipe (1c), and the cooling water outlet (2d) of the heat exchanger is connected to the hot water inlet (1n) of the condensing water tank.

2. The condensed water recovery device for the redrying process according to claim 1, characterized in that: The heat exchanger (2) is provided with a plurality of vertically arranged baffles (2g), which are arranged in a staggered manner so as to form a condensation channel for flash steam to pass through in the heat exchanger (2), and a notch is provided at the bottom of the lower baffle (2g) to allow the flash steam to flow after condensation.

3. The condensed water recovery device for the redrying process according to claim 1, characterized in that: The condensing module is composed of a plurality of heat exchange tubes (2f), and three mutually adjacent heat exchange tubes (2f) are arranged in an equilateral triangle.

4. The condensed water recovery device for the redrying process according to claim 1, characterized in that: The condensing water tank (1) is provided with a condensing water tank exhaust port (1e), and the heat exchanger (2) is provided with a heat exchanger exhaust port (2e).

5. The condensed water recovery device for the redrying process according to claim 1, characterized in that: The condensation water tank (1) is provided with a pressure sensor, a temperature sensor and a liquid level gauge.

6. The condensed water recovery device for the redrying process according to claim 1, characterized in that: An overflow pipe (1f) is provided on the upper part of the condensation water tank (1). The overflow pipe (1f) is located inside the condensation water tank (1) and extends downward to below the condensation water tank (1f).

7. The condensed water recovery device for the redrying process according to claim 1, characterized in that: A condensate vortex preventer (11) is installed at the water outlet (1d) of the condensate tank.

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