A urea reaction heat energy recovery system

Abstract

The present invention relates to a urea reaction heat energy recovery system, and belongs to the technical field of heat energy recovery systems. The present invention includes a furnace body, an air outlet pipe is connected to the furnace body, the end of the air outlet pipe is connected to a heat recovery box, the heat recovery box is connected to an exhaust pipe, and a heat exchange component is provided in the heat recovery box, the heat exchange component includes a plurality of heat exchange pipes arranged at intervals on the left and right; the heat exchange pipe includes a plurality of horizontal pipe sections arranged at intervals up and down and extending in the front-to-back direction, and a vertical pipe section for connecting the two horizontal pipe sections is connected between the ends of any two adjacent horizontal pipe sections up and down, and each horizontal pipe section is adapted to be inserted with a scraper 1, and the left and right pipe walls of the vertical pipe section are both arc-shaped and coaxial, and each vertical pipe section is provided with a scraper 2, which is rotatably installed in the vertical pipe section around the axis of the arc-shaped side wall. The present invention can effectively remove scale on the inner side wall of the spiral heat exchange pipe to avoid affecting the heat exchange efficiency.

Claims

1. A urea reaction heat recovery system, comprising a furnace body, characterized in that: The furnace body is connected to an exhaust pipe, the end of which is connected to a heat recovery box, which is connected to an exhaust pipe. The heat recovery box is provided with a heat exchange component, which includes multiple heat exchange pipes arranged at intervals on the left and right. The heat exchange pipe includes a plurality of horizontal pipe sections arranged at intervals in the vertical direction and extending in the front-to-back direction. A vertical pipe section for connecting the two horizontal pipe sections is connected between the ends of any two vertically adjacent horizontal pipe sections. Any two vertically adjacent vertical pipe sections are respectively arranged at the front and rear ends of the horizontal pipe section between the two vertical pipe sections. The top opening of the heat exchange pipe is the pipe inlet, and the bottom opening is the pipe outlet. Each horizontal pipe section is adapted to be inserted with a scraper 1, which can slide back and forth in the horizontal pipe section to scrape off the scale on the inner wall of the horizontal pipe section; The left and right walls of the vertical pipe section are both arc-shaped and coaxial, with their axes extending in the front-to-back direction. Each vertical pipe section is provided with a second scraper. The width of the second scraper in the front-to-back direction matches the inner diameter of the vertical pipe section in the front-to-back direction. The second scraper is installed in the vertical pipe section so as to rotate around the axis of the arc-shaped side wall. During the rotation of the second scraper, scale on the inner side walls of the vertical pipe section can be scraped off. The scraper is provided with a pull rod extending forward and backward. The end of the pull rod facing away from the scraper is passed through the outside of the heat exchange pipe. When the pull rod is pulled forward and backward, it can drive the scraper to slide forward and backward in the horizontal pipe section to scrape off scale. A transmission screw extending forward and backward is spirally installed in the scraper 2. When the transmission screw is pulled forward and backward, it can drive the scraper 2 to rotate in the vertical pipe section to scrape off scale; The front and rear sides of the heat recovery box are respectively provided with a connector 1 and a connector 2. The transmission screws passing through the scraper 2 in each vertical pipe section on the front side are all connected to the connector 1. The pull rods passing through each horizontal pipe section adjacent to the vertical pipe section on the front side are also connected to the connector 1. The remaining pull rods and transmission screws are all connected to the connector 2. The connector 1 and the connector 2 can both move back and forth in the front and rear directions to drive the scraper 1 to slide back and forth and drive the scraper 2 to rotate to scrape off the scale in the heat exchange pipe. The scraper 1 includes a plate frame and a plurality of movable plates. The plurality of movable plates are evenly distributed on the plate frame around a central axis extending forward and backward. Each movable plate is movably mounted on the plate frame. The direction along the water flow in the heat exchange pipe is defined as a first movement direction, and the direction against the water flow is defined as a second movement direction. When the scraper 1 moves along the first movement direction, each movable plate can move away from the center of the plate frame and be pressed against each pipe wall of the horizontal pipe section. When the scraper 1 moves along the second movement direction, each movable plate can gather toward the center of the plate frame to be loosened from the pipe wall of the corresponding horizontal pipe section. A through-hole is provided in the middle of the plate frame, and each movable plate is connected to a support rod, which is elastically slidably installed on the plate frame along a direction perpendicular to the axis of the through-hole. The end of each support rod facing away from the movable plate extends into the through-hole, and the end of the support rod extending into the through-hole is provided with a sliding slope, and the sliding slopes approach each other along the first moving direction. A driving block is provided in the through-hole, and the driving block is located in the area surrounded by the sliding slopes. When the driving block moves along the first moving direction, it can push each support rod away from the center of the plate frame through the sliding slope, so as to drive the movable plate away from the center of the plate frame and press it against the corresponding pipe wall in the horizontal pipe section. The pull rod is connected to the driving block.

2. A urea reaction heat recovery system according to claim 1, characterized in that: A stop plate is also provided on the plate frame, which is located in front of the driving block in the second moving direction. The stop plate and the driving block stop each other front and back. When the driving block moves along the second moving direction, it can push the stop plate and drive the scraper to move along the second moving direction.

3. A urea reaction heat recovery system according to claim 1, characterized in that: The top inlet of each heat exchange pipe is connected to an inlet main pipe extending left and right, and the bottom outlet of each heat exchange pipe is connected to an outlet main pipe extending left and right. A low-temperature water tank and a high-temperature water tank are provided below the heat recovery tank. One end of the inlet main pipe is closed, and the other end is connected to the low-temperature water tank. One end of the outlet main pipe is closed, and the other end is connected to the high-temperature water tank. A filter element is provided in the outlet main pipe, and a pump body is provided between the inlet main pipe and the water tank. The pump body is used to pump the water in the low-temperature water tank into each heat exchange pipe, and force the heated hot water in the heat exchange pipe to flow into the high-temperature water tank.

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