Excess heat energy recovery device of compound fertilizer production system

Abstract

The utility model relates to a compound fertilizer production system surplus heat energy recovery device which comprises a flash tank, a delivery pump and a heat exchange cylinder, a steam exhaust port of the flash tank is communicated with an inlet of the delivery pump, a steam inlet ring pipe is sleeved on the lower portion of the outer side of the heat exchange cylinder, a steam exhaust ring pipe is sleeved on the upper portion of the outer side of the heat exchange cylinder, an outlet of the delivery pump is communicated with the steam inlet ring pipe, and the steam exhaust ring pipe is communicated with a discharge pipe. A plurality of snakelike heat exchange coils are evenly distributed on the edge portion in the heat exchange cylinder, bottom ports of the heat exchange coils are communicated with the steam inlet annular pipe, top ports of the heat exchange coils are communicated with the steam exhaust annular pipe, a circulating pipe is arranged in the center in the heat exchange cylinder, and a circulating pump is arranged in the circulating pipe. An inlet of the circulating pump downwards communicates with a liquid suction pipe extending out of the circulating pipe, an outlet upwards communicates with a liquid discharge pipe extending out of the circulating pipe, a plurality of supporting rods are evenly distributed on the peripheral side of the top of the circulating pipe, the top ends of the supporting rods are fixedly connected with the same conical blocking cover, and the top end of the blocking cover is fixedly connected with the inner top of the heat exchange cylinder through a supporting column. The device can effectively recycle redundant heat energy, and is more practical.

Description

Technical Field

[0001] The utility model belongs to the technical field of compound fertilizer production, and in particular relates to a device for recovering excess heat energy in a compound fertilizer production system. Background Art

[0002] Compound fertilizer refers to a chemical fertilizer containing two or more nutrients including nitrogen, phosphorus and potassium. It has the advantages of high nutrient content, few by-components and good physical properties. It plays a very important role in balanced fertilization, improving fertilizer utilization and promoting high and stable yields of crops.

[0003] The current production process for compound fertilizers primarily involves batching, mixing, and granulating raw materials, drying, cooling, and grading the granules, as well as coating and packaging the finished product. Depending on the actual situation, the drying process may require multiple drying steps, such as primary or secondary drying. High-temperature steam is typically used as a heat source. After heat exchange, some of the steam condenses and liquefies, forming a steam-water mixture with the remaining steam before being discharged from the compound fertilizer production system. However, this discharged steam-water mixture still contains a significant amount of excess heat energy. If not recycled, this wastes energy, negatively impacting the company's economic performance and requiring improvement. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a surplus heat energy recovery device for a compound fertilizer production system, which can effectively recover and utilize excess heat energy to solve the above-mentioned problems.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a device for recovering excess heat energy from a compound fertilizer production system, comprising a flash tank, a delivery pump and a heat exchanger, wherein the exhaust port of the flash tank is connected to the inlet of the delivery pump, the lower portion of the outer side of the heat exchanger is sleeved with a steam inlet ring pipe, and the upper portion is sleeved with an exhaust ring pipe, the outlet of the delivery pump is connected to the steam inlet ring pipe, and the exhaust ring pipe is connected to a discharge pipe, and a plurality of serpentine heat exchange coils are uniformly distributed at circumferential intervals on the edge of the heat exchanger, the heat exchange coils are vertically arranged, and the port at the bottom is connected to the steam inlet ring pipe, and the port at the top is connected to the exhaust ring pipe, and each heat exchanger is connected to the outer side of the heat exchanger. A number of heat dissipation fins are distributed on the outer surface of the coil, and a circulation pipe is vertically provided in the center of the heat exchange tube. The top and bottom ends of the circulation pipe are closed and a circulation pump is built in the circulation pipe. The inlet of the circulation pump faces downward and is connected to a suction pipe extending out of the circulation pipe, and the outlet faces upward and is connected to a discharge pipe extending out of the circulation pipe. A number of support rods are distributed on the top circumference of the circulation pipe, and the top ends of the support rods are fixedly connected to the same conical baffle, and the top end of the baffle is fixedly connected to the inner top of the heat exchange tube through a support. One side of the top of the heat exchange tube is connected to a liquid inlet pipe with an inlet valve, and the bottom center is connected to a discharge pipe with a drain valve.

[0006] Preferably, the outlet of the delivery pump is connected to the steam inlet ring pipe through a delivery pipe with a flow regulating valve.

[0007] The beneficial effects of the present utility model are as follows: during use, the liquid inlet valve can be opened first, and the liquid medium such as water to be heated can be fed into the heat exchange cylinder through the liquid inlet pipe. Then, the steam-water mixture discharged from the compound fertilizer production system is fed into the flash tank through the flash tank's feed port, and the steam condensate is flashed into steam by the flash tank, thereby realizing the conversion and recovery of low-level thermal energy. Subsequently, under the pumping of the delivery pump, the converted steam can be fed into the steam inlet ring pipe, and then diverted to each heat exchange coil to exchange heat with the medium in the heat exchange cylinder, thereby realizing the reuse of low-level thermal energy. The steam after heat exchange is collected in the exhaust ring pipe and then discharged through the discharge pipe to the subsequent process. During the heat exchange process, the serpentine heat exchange coil can effectively extend the steam retention time, and the multiple heat dissipation fins on the surface of the heat exchange coil can also better transfer the steam's thermal energy, thereby better exchanging heat with the medium in the heat exchange cylinder. At the same time, through the operation of the circulation pump in the circulation pipe, the medium at the bottom of the heat exchange cylinder can be continuously pumped to the upper part of the heat exchange cylinder through the suction pipe, and discharged through the discharge pipe. Under the flow resistance and dispersion effect of the baffle, the medium is redispersed and falls back, so that the medium can circulate and flow, mix more evenly, and heat more evenly everywhere. It can better contact and exchange heat with the heat exchange coil, improve the efficiency and quality of heat exchange, ensure the reuse rate of low-level thermal energy, reduce energy waste, and be more beneficial to the economic benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0009] Figure 2 This is a schematic diagram of the main structure of the heat exchange tube of the utility model;

[0010] Figure 3 This is a schematic diagram of the main structure of the circulation pipe of the utility model.

[0011] Numbers in the figure: 1 is a flash tank, 2 is a delivery pump, 3 is a heat exchange cylinder, 4 is a steam inlet ring pipe, 5 is an exhaust ring pipe, 6 is a discharge pipe, 7 is a heat exchange coil, 8 is a heat dissipation fin, 9 is a circulation pipe, 10 is a circulation pump, 11 is a suction pipe, 12 is a discharge pipe, 13 is a support rod, 14 is a baffle, 15 is a support, 16 is a liquid inlet valve, 17 is a liquid inlet pipe, 18 is a discharge valve, 19 is a discharge pipe, 25 is a flow control valve, and 26 is a delivery pipe. DETAILED DESCRIPTION

[0012] The present invention is described in further detail below with reference to the accompanying drawings and specific embodiments:

[0013] like Figures 1 to 3As shown, a device for recovering excess heat energy from a compound fertilizer production system comprises a flash tank 1, a delivery pump 2, and a heat exchanger 3. The exhaust port of the flash tank 1 is connected to the inlet of the delivery pump 2. The heat exchanger 3 is sheathed with a steam inlet annular pipe 4 at the lower portion and an exhaust annular pipe 5 at the upper portion. The outlet of the delivery pump 2 is connected to the steam inlet annular pipe 4, and the exhaust annular pipe 5 is connected to a discharge pipe 6. Several serpentine heat exchange coils 7 are evenly spaced around the circumference of the heat exchanger 3. The heat exchange coils 7 are arranged vertically, with their bottom ports connected to the steam inlet annular pipe 4 and their top ports connected to the exhaust annular pipe 5. Each heat exchange coil 7 has several heat dissipating fins 8 distributed on its outer surface. A circulation pipe 9 is vertically installed in the center of the heat exchanger 3. The circulation pipe 9 is sealed at both the top and bottom ends and houses a circulation pump 10. The inlet of the circulation pump 10 faces downward and is connected to a liquid suction pipe 11 extending from the circulation pipe 9. The outlet of the circulation pump 10 faces upward and is connected to a liquid discharge pipe 12 extending from the circulation pipe 9. Several support rods 13 are evenly distributed around the top of the circulation tube 9. The tops of the support rods 13 are fixedly connected to a conical shield 14. The top of the shield 14 is fixedly connected to the inner top of the heat exchange tube 3 via a support 15. A liquid inlet pipe 17 with a liquid inlet valve 16 is connected to one side of the top of the heat exchange tube 3, and a liquid discharge pipe 19 with a liquid discharge valve 18 is connected to the center of the bottom.

[0014] During operation, the liquid inlet valve 16 is opened and the liquid medium, such as water, to be heated, is introduced into the heat exchanger 3 through the liquid inlet pipe 17. Then, the steam-water mixture discharged from the compound fertilizer production system is fed into the flash tank 1 through its feed port. The flash tank 1 flashes the steam condensate into steam, thereby converting and recovering low-level thermal energy. Subsequently, the converted steam is pumped by the delivery pump 2 into the steam inlet loop 4. It is then distributed to the various heat exchange coils 7, where it exchanges heat with the medium within the heat exchanger 3, thereby reusing the low-level thermal energy. The heat exchanged steam then flows into the exhaust loop 5 and is discharged through the discharge pipe 6 to subsequent processes. During the heat exchange process, the serpentine shape of the heat exchange coils 7 effectively extends the steam's residence time. The multiple heat dissipation fins 8 on the surface of the heat exchange coils 7 also effectively transfer the steam's thermal energy, thereby enabling better heat exchange with the medium within the heat exchanger 3. At the same time, through the operation of the circulation pump 10 in the circulation pipe 9, the medium at the bottom of the heat exchange tube 3 can be continuously pumped to the upper part of the heat exchange tube 3 through the suction pipe 11, and discharged through the discharge pipe 12. Under the flow resistance and dispersion effect of the baffle 14, the medium is redispersed and falls back, so that the medium can circulate and flow, mix more evenly, and heat more evenly everywhere. It can better contact and exchange heat with the heat exchange coil 7, improve the efficiency and quality of heat exchange, ensure the reuse rate of low-level thermal energy, reduce energy waste, and be more beneficial to the economic benefits of the enterprise.

[0015] In this embodiment, the outlet of the delivery pump 2 is connected to the steam inlet ring pipe 4 through a delivery pipe 26 with a flow regulating valve 25, so as to effectively regulate the flow of the input steam during heat exchange and ensure the heat exchange quality.

[0016] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for recovering excess heat energy in a compound fertilizer production system, comprising a flash tank, a delivery pump and a heat exchange cylinder, characterized in that: The exhaust port of the flash tank is connected to the inlet of the delivery pump, the lower part of the outer side of the heat exchange cylinder is provided with a steam inlet ring pipe, the upper part is provided with an exhaust ring pipe, the outlet of the delivery pump is connected to the steam inlet ring pipe, the exhaust ring pipe is connected to a discharge pipe, the edge of the heat exchange cylinder is evenly distributed with a number of serpentine heat exchange coils at circumferential intervals, the heat exchange coils are vertically arranged and the bottom port is connected to the steam inlet ring pipe, the top port is connected to the exhaust ring pipe, the outer surface of each heat exchange coil is distributed with a number of heat dissipation fins, the central vertical heat exchanger in the heat exchange cylinder A circulation pipe is provided in the direction, the top and bottom ends of the circulation pipe are closed and a circulation pump is built in the circulation pipe, the inlet of the circulation pump faces downward and is connected to a suction pipe extending out of the circulation pipe, and the outlet faces upward and is connected to a discharge pipe extending out of the circulation pipe, a number of support rods are evenly distributed on the top circumference of the circulation pipe, the top ends of the support rods are fixedly connected to the same conical baffle, the top of the baffle is fixedly connected to the inner top of the heat exchange tube through a support, one side of the top of the heat exchange tube is connected to a liquid inlet pipe with an inlet valve, and the bottom center is connected to a discharge pipe with a discharge valve.

2. The excess heat energy recovery device for compound fertilizer production system according to claim 1, characterized in that: The outlet of the delivery pump is communicated with the steam inlet ring pipe through a delivery pipe with a flow regulating valve.

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