Tank car cleaning steam recovery system

Abstract

The utility model discloses a tank car cleaning steam recovery system relates to the field of energy saving and environmental protection. The utility model provides a steam - hot water cascade recovery system for the background problem of steam direct discharge, hot water high temperature blowdown leading to energy waste and workshop humid heat noise big when food grade tank car such as maltose is cleaned, and the scheme adopts the steam of tank car top pressure relief and enters the plate type condenser through the steam guide pipe, and the remaining steam condenses about 120 DEG C condensed water in heat exchange and gives off heat to heat process water, and the condensed water is sent into the recovery water tank through the steam-water separator and centrifugal pump and is used for the boiler makeup water again, and the process water after heating is stored in process water tank and hot process water tank in proper order, and is delivered to the workshop hot water tank circulating flushing through the hot water pump, and the washing waste water is discharged after reaching the standard through the blowdown pipe heat exchange cooling again. The structure is closed loop circulation that is constituted by the module of steam and hot water import, tank car, pressure relief export, condenser, steam-water separator, condensed water pump, three stage water tank and two stage water pump etc. through the flange pipeline and the heat preservation pipeline series connection.

Description

Technical Field

[0001] This utility model relates to the field of energy conservation and environmental protection, specifically a steam recovery system for tanker cleaning. Background Technology

[0002] In the transportation of bulk liquid raw materials in industries such as syrup, dairy products, starch sugar, and brewing, food-grade tank trucks undergo on-site cleaning with steam and hot water before and after loading different batches of materials. This removes residues, kills microorganisms, and prevents cross-contamination. Current cleaning processes mostly rely on on-site boilers or centralized steam networks to supply high-temperature steam and hot water. These processes are simple and have low investment thresholds, and are therefore widely used.

[0003] Traditional tanker cleaning devices often discharge overpressured steam from inside the tank directly into the atmosphere through exhaust pipes or safety valves during the steam cleaning stage. This results in the complete loss of sensible and latent heat, generating high-temperature humid steam clouds, which wastes energy and deteriorates the operating environment. At the same time, the exhaust noise is loud and the temperature is high, which can easily cause burns to operators and corrosion of surrounding equipment, posing safety hazards.

[0004] During the hot water washing stage, there is no effective way to recover the high-temperature wastewater discharged from the bottom of the tanker. Most companies directly discharge it into the sewage ditch or temporary collection pool and then cool it down before discharging it. A large amount of heat energy and water resources are lost. Additional cooling towers or cooling pools are required to meet the environmental emission temperature requirements, which increases equipment investment and operating costs and is difficult to conform to the current industry development trend of energy conservation and carbon reduction. Utility Model Content

[0005] The main purpose of this invention is to provide a steam recovery system for tanker cleaning, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a tank truck cleaning steam recovery system, wherein the steam and hot water inlets are located at the top of the tank truck and communicate with the inner cavity of the tank truck; the tank body drain outlet is located at the bottom of the tank truck and is connected to the heat-returning process water tank through a drain pipe; the steam pressure relief outlet is arranged at the upper part of the tank truck and is connected to the condenser, steam-water separator and condensate pump in sequence through a steam guide pipe and then communicates with the workshop recovery water tank; a heat exchange channel is provided between the condenser and the process water tank to transfer condensation heat to the process water; the outlet of the process water tank is connected to the hot process water tank through a process water pump; and the outlet of the hot process water tank is connected to the workshop hot water tank through a hot process water pump.

[0007] Preferably, the condenser is a 316L stainless steel plate heat exchanger, which is assembled by a pair of carbon steel clamping plates pressing several corrugated heat transfer plates together with 12 M20-8.8 grade bolts. The steam side inlet and outlet are connected to the steam pipe and steam-water separator by DN50PN1.6 raised face flanges, and the cooling water side inlet and outlet are connected to the heat exchange channel of the process water tank by DN65PN1.6 raised face flanges.

[0008] Preferably, the gas-water separator is a vertical cylindrical structure with a cylinder diameter of Φ500mm and a height of 1200mm. A DIN DN25 safety valve and a DN20 sampling port are installed at the top. The bottom of the cylinder is connected to the drain pipe through a DN25 ball valve. Four 80mm×6mm reinforcing ribs are welded to the outer wall of the cylinder and fixed to the foundation channel steel with angle steel legs.

[0009] Preferably, the process water pump and the hot process water pump are arranged in parallel on the same pump set foundation. The suction port of each pump is connected to the bottom outlet of the hot process water tank through a DN40 tee, and the discharge port is connected in parallel to the main pipeline to the hot water tank in the workshop through a DN32 stainless steel ball valve.

[0010] Preferably, the process water tank is a vertical structure with a conical bottom, a DN450 manhole is provided in the center of the top of the tank, the tank wall height is 2000mm and the wall thickness is 6mm, a DN25 breather valve is provided at the top, and the bottom of the tank is welded to the channel steel ring beam by four 100mm×100mm×10mm angle steel legs.

[0011] Preferably, the connecting pipe between the hot water tank in the workshop and the water supply network in the workshop is a DN50 insulated carbon steel pipe. A DN50 check valve, a DN50 carbon steel gate valve and a DN50 quick connector are installed sequentially at the pipe outlet. The quick connector adopts the clamp-type structure of GB / T22765-2008 standard and uses a nitrile rubber sealing ring.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention forms a fully enclosed steam and condensate circulation channel by sequentially configuring a condenser, a steam-water separator, and a condensate pump on the steam pressure relief pipeline. This forces the overpressure steam generated during tanker cleaning to be condensed within the system, and efficiently transfers sensible and latent heat to the process water, achieving immediate heat recovery and secondary utilization. Compared with existing direct exhaust steam solutions, it can reduce exhaust steam by 100%, significantly reduce workshop humidity and noise, avoid the risk of burns and corrosion, and reduce overall boiler steam consumption by 15%–20%, greatly improving energy efficiency and operational safety.

[0014] During the hot water rinsing stage, the discharged high-temperature wastewater flows directly into the hot process water tank equipped with heat exchange coils through the sewage pipe, and is then pumped by the hot process water pump to the workshop hot water tank for production or subsequent cleaning, thus constructing a tiered water system of "normal temperature recovered water, medium temperature process water, and high temperature hot water". This structure not only recovers more than 30% of water resources and sensible heat, eliminating the need for additional investment and operating electricity consumption in cooling towers or cooling pools, but also ensures that the discharge temperature is stably controlled below the environmental protection limit, comprehensively solving the problems of high cost and large waste of resources in the treatment of high-temperature wastewater in traditional processes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] In the diagram: 1. Steam and hot water inlet; 2. Tank truck; 3. Steam pressure relief outlet; 4. Condenser; 5. Steam-water separator; 6. Condensate pump; 7. Water tank for workshop recovery; 8. Process water tank; 9. Process water pump; 10. Hot process water tank; 11. Hot process water pump; 12. Hot water tank for workshop; 13. Tank drain outlet. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Example

[0021] Please see Figure 1 This utility model provides a technical solution:

[0022] The tanker cleaning steam recovery system includes a steam and hot water inlet 1 located at the top of the tanker 2 and connected to the inner cavity of the tanker 2. The tank body drain outlet 13 is located at the bottom of the tanker 2 and connected to the heat-returning process water tank 10 via a drain pipe. The steam pressure relief outlet 3 is located on the upper part of the tanker 2 and connected to the condenser 4, steam-water separator 5, and condensate pump 6 in sequence via a steam guide pipe, and then connected to the workshop recovery water tank 7. A heat exchange channel is provided between the condenser 4 and the process water tank 8 to transfer condensation heat to the process water. The outlet of the process water tank 8 is connected to the hot process water tank 10 via a process water pump 9. The outlet of the hot process water tank 10 is connected to the workshop hot water tank 12 via a hot process water pump 11.

[0023] Component composition and installation location:

[0024] Tank Truck 2: Located on the cleaning station track, with steam and hot water inlets at the top center, a steam pressure relief outlet on the upper left, and a tank drain outlet at the bottom center. The condenser, a 316L plate heat exchanger, is located on a bracket 1.2m to the right of the tank truck. The DN80 steam-side interface is connected to the steam pressure relief outlet 3 via a 2m seamless steel pipe; the DN65 cooling water-side interface connects to the process water tank 8. The steam-water separator, a vertical cylinder, is located 0.5m below the condenser, with a micro-vent valve at the top and a drain pipe connected to the bottom via a DN25 ball valve. The condensate pump is a horizontal centrifugal pump with a diameter of Q=2.5m. 3 The process water pump, with a flow rate of / h and a height of H=24m, is installed on the lower right side of separator 5. Its DN50 suction inlet connects to the bottom short section of the separator, and its DN40 discharge outlet is transported via a 10m insulated pipe to the workshop recovery water tank. The process water tank is a vertical conical bottom tank, located directly below the condenser, with a DN450 manhole and a DN25 breather valve on the top. The process water pump has a flow rate of Q=3m. 3 / h, H=30 m, installed 0.4m to the right of the process water tank, with a DN40 suction inlet connected to the bottom pipe of the tank, and a DN40 discharge outlet leading to the hot process water tank 10. The hot process water tank is located on the upper right side of the process water tank, with Φ25mm×2mm spiral coils laid inside; an overflow port with a DN40 outlet is installed on the top of the tank. Hot process water pump Q=3 m 3 / h, H=35m, installed below the hot process water tank, with the DN32 outlet connected to the workshop hot water tank 12 via an 8m insulated pipe.

[0025] The work steps are as follows:

[0026] Open the steam valve at inlet 1 on the top of tanker truck 2. Saturated steam enters the tank and steams the inner wall. When the pressure inside the tank rises to 0.03 MPa, the overpressure steam enters the condenser from the steam relief outlet, where it exchanges heat counter-currently with the 25°C process water in the process water tank and completely condenses into 120°C saturated water. The 120°C condensate enters the steam-water separator, removes entrained air, and is then pumped by the condensate pump to the workshop recovery water tank for boiler makeup or general cleaning. The condenser heats the process water tank, raising the water temperature to 80°C. The process water pump pumps the hot water into the hot process water tank, storing it in the 70–90°C range for later use. Switch the inlet to the hot water valve, and the hot process water pump sends 80°C hot water to the workshop hot water tank, then flows back from the tank to the inlet for high-temperature washing of the tanker truck. The washing wastewater enters the hot process water tank coil area through the drain outlet and DN65 PTFE-lined pipe for heat exchange, and is discharged into the plant's wastewater treatment plant after cooling to 45°C.

[0027] Based on a steam mass flow rate m_s = 150 kg / h, a steam enthalpy h_g = 2756 kJ / kg, and a saturated water enthalpy h_f = 504 kJ / kg at 120 ℃, the recoverable heat per hour is...

[0028]

[0029] It is equivalent to saving 60 kg / h of saturated steam, the measured boiler steam consumption is reduced by 18%, the blowdown temperature is stable at ≤45℃, and the noise is reduced by ≥30 dB(A). The verification effect is repeatable.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A steam recovery system for tanker cleaning, comprising a steam and hot water inlet (1), a steam pressure relief outlet (3), a condenser (4), a process water tank (8), a hot process water tank (10), and a tank body drain outlet (13), characterized in that: The steam and hot water inlet (1) is located on the top of the tanker (2) and communicates with the inner cavity of the tanker (2). The tank body drain outlet (13) is located at the bottom of the tanker (2) and is connected to the hot process water tank (10) through the drain pipe. The steam pressure relief outlet (3) is located on the upper part of the tanker (2) and is connected to the condenser (4), steam-water separator (5) and condensate pump (6) in sequence through the steam pipe and then connected to the workshop recovery water tank (7). A heat exchange channel is provided between the condenser (4) and the process water tank (8) to transfer the condensation heat to the process water. The outlet of the process water tank (8) is connected to the hot process water tank (10) through the process water pump (9). The outlet of the hot process water tank (10) is connected to the hot water tank (12) in the workshop through the hot process water pump (11).

2. The tanker cleaning steam recovery system according to claim 1, characterized in that: The condenser (4) is a stainless steel 316L plate heat exchanger, which is assembled by a pair of carbon steel clamping plates and several corrugated heat transfer plates pressed by 12 M20-8.8 grade bolts. The steam side inlet and outlet are connected to the steam pipe and steam-water separator (5) by DN50PN1.6 raised face flanges. The cooling water side inlet and outlet are connected to the heat exchange channel of the process water tank (8) by DN65PN1.6 raised face flanges.

3. The tanker cleaning steam recovery system according to claim 1, characterized in that: The gas-water separator (5) is a vertical cylindrical structure with a cylinder diameter of Φ500mm and a height of 1200mm. A DINDN25 safety valve and a DN20 sampling port are installed at the top. The bottom of the cylinder is connected to the sewage pipe through a DN25 ball valve. Four 80mm×6mm reinforcing ribs are welded to the outer wall of the cylinder and fixed to the foundation channel steel with angle steel feet.

4. The tanker cleaning steam recovery system according to claim 1, characterized in that: The process water pump (9) and the hot process water pump (11) are arranged in parallel on the same pump group foundation. The suction port of each pump is connected to the bottom outlet of the hot process water tank (10) through a DN40 tee, and the discharge port is connected in parallel to the main pipeline to the hot water tank (12) in the workshop through a DN32 stainless steel ball valve.

5. The tanker cleaning steam recovery system according to claim 1, characterized in that: The process water tank (8) is a vertical structure with a conical bottom. A DN450 manhole is provided in the center of the top of the tank. The tank wall is 2000mm high and 6mm thick. A DN25 breather valve is also provided at the top. The bottom of the tank is welded to the channel steel ring beam by four 100mm×100mm×10mm angle steel legs.

6. The tanker cleaning steam recovery system according to claim 1, characterized in that: The connection pipe between the hot water tank (12) in the workshop and the water supply network in the workshop is a DN50 insulated carbon steel pipe. A DN50 check valve, a DN50 carbon steel gate valve and a DN50 quick connector are installed in sequence at the outlet of the pipe. The quick connector adopts the clamp-type structure of GB / T22765-2008 standard and uses a nitrile rubber sealing ring.

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