Sodium hypophosphite solution evaporation device
By designing a sodium hypophosphite solution evaporation device including a preheater, a feed heat exchanger, a plate evaporator, a cyclone separator and a steam compressor, the existing three-effect evaporation device has large land area and large steam consumption, and the effect of efficient energy saving and building space saving is achieved.
Patent Information
- Application Number
- CN202422099477.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-28
AI Technical Summary
The existing three-effect evaporation device covers a large area of land in the production process of sodium hypophosphite, and consumes a large unit of steam, which increases production costs and is not conducive to energy conservation and environmental protection.
A sodium hypophosphite solution evaporation device is designed, including a preheater, a feed heat exchanger, an N-level plate evaporator, an N-level cyclone separator and a steam compressor. By utilizing secondary steam in multiple stages, the use of high-temperature steam is reduced.
It has achieved small footprint, reduced energy consumption, and saved about 50% of energy, and has the advantages of efficient energy saving, building space saving, and safe production.
Smart Images
Figure CN223026718U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of chemical production equipment, in particular to a sodium hypophosphite evaporation device. Background Art
[0002] In the production process of sodium hypophosphite, it is necessary to evaporate and concentrate the low-concentration sodium hypophosphite aqueous solution to a high concentration and then cool and crystallize it.
[0003] Most of the existing technologies use a triple-effect evaporation device to evaporate the sodium hypophosphite solution. However, it is found in the actual production process that the triple-effect evaporation device has the disadvantages of large floor area and large specific steam consumption, increasing the production cost and being not conducive to energy conservation and environmental protection. Summary of the Utility Model
[0004] The utility model solves the above problems existing in the production process of sodium hypophosphite by providing a sodium hypophosphite evaporation device.
[0005] To solve the above technical problems, the utility model provides a sodium hypophosphite solution evaporation device, comprising: a preheater, a feed heat exchanger, an N-stage plate evaporator, an N-stage cyclone separator and a steam compressor, where N is a natural number greater than or equal to 3;
[0006] The feed inlet of the preheater is connected to the sodium hypophosphite solution storage tank to be evaporated, and its discharge outlet is connected to the feed heat exchanger; the discharge outlet of the feed heat exchanger is connected to the feed inlet of the first-stage plate evaporator; the discharge outlet of the first-stage plate evaporator is connected to the first-stage cyclone separator; the gas phase outlet of the first-stage cyclone separator is connected to the steam compressor, and its liquid phase outlet is connected to the next-stage plate evaporator;
[0007] Both the gas phase outlet and the liquid phase outlet of the (N - 1)-th stage cyclone separator are connected to the N-th stage plate evaporator; the gas phase outlet of the N-th stage cyclone separator is connected to the preheater, and its liquid phase outlet is the outlet of the evaporated sodium hypophosphite concentrate.
[0008] In a preferred embodiment of the utility model, the steam inlets of the first-stage plate evaporator to the (N - 1)-th stage plate evaporator are connected to a fresh steam source and the steam outlet of the steam compressor.
[0009] In a preferred embodiment of the utility model, the device further comprises a first-stage gas-liquid separator;
[0010] The steam outlets of the feed heat exchanger and the first-stage plate evaporator are connected to the first-stage gas-liquid separator, the gas phase outlet of the first-stage gas-liquid separator is connected to the steam compressor, and its liquid phase outlet is connected to the preheater.
[0011] In a preferred embodiment of the present utility model, the device further includes a secondary gas-liquid separator;
[0012] The steam outlets of the second-stage plate evaporator to the (N - 1)-th stage plate evaporator are connected to the secondary gas-liquid separator. The gas-phase outlet of the secondary gas-liquid separator is connected to the steam compressor, and its liquid-phase outlet is connected to the preheater.
[0013] In a preferred embodiment of the present utility model, the preheater includes a first preheater and a second preheater;
[0014] Among them, the feed inlet of the first preheater is connected to the sodium hypophosphite solution storage tank to be evaporated, and its discharge outlet is sequentially connected to the second preheater and the feed heat exchanger;
[0015] The gas-phase outlet of the N-th stage cyclone separator is connected to the first preheater,
[0016] The liquid-phase outlet of the secondary gas-liquid separator is connected to the second preheater.
[0017] In a preferred embodiment of the present utility model, the device further includes a condenser, and the gas-phase outlet of the first preheater is connected to the condenser.
[0018] The beneficial effects of the present utility model are as follows: For a sodium hypophosphite solution evaporation device of the present utility model, through the design of the preheater, feed heat exchanger, N-stage plate evaporator, N-stage cyclone separator, and steam compressor, it not only occupies a small area, but also realizes the multi-stage effective utilization of secondary steam, reduces the use of high-temperature steam, effectively reduces energy consumption, and while improving the evaporation effect of sodium hypophosphite, has the advantages of energy conservation and environmental protection, is beneficial to safe production, and has strong practicability. Description of the Drawings
[0019] Figure 1 is a schematic three-dimensional structure diagram of a preferred embodiment of the present utility model;
[0020] The markings of each component in the drawings are as follows:
[0021] 10. First preheater, 20. Second heat exchanger, 30. Feed heat exchanger;
[0022] 41. First-stage plate evaporator, 42. Second-stage plate evaporator, 43. Third-stage plate evaporator;
[0023] 51. First-stage cyclone separator, 52. Second-stage cyclone separator, 53. Third-stage cyclone separator;
[0024] 60. Steam compressor, 70. Primary gas-liquid separator, 80. Secondary gas-liquid separator, 90. Condenser, 100. Fresh steam source. Detailed Embodiments
[0025] The following describes in detail the preferred embodiments of the present invention with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.
[0026] Please refer to Figure 1 , the embodiments of the present invention include:
[0027] The present invention discloses a sodium hypophosphite solution evaporation device, including: a first preheater 10, a second heat exchanger 20, a feed heat exchanger 30, an N-stage plate evaporator 40, an N-stage cyclone separator 50, and a steam compressor 60, where N is a natural number greater than or equal to 3. The steam compressor 60 is specifically an MVR steam compressor.
[0028] Specifically, in this embodiment, N is 3. Therefore, the N-stage plate evaporator 40 includes a first-stage plate evaporator 41, a second-stage plate evaporator 42, and a third-stage plate evaporator 43. The N-stage cyclone separator 50 includes a first-stage cyclone separator 51, a second-stage cyclone separator 52, and a third-stage cyclone separator 53.
[0029] The feed inlet of the first preheater 10 is connected to the sodium hypophosphite solution storage tank to be evaporated, and its discharge outlet is sequentially connected to the second preheater 20 and the feed heat exchanger 30. The discharge outlet of the feed heat exchanger 30 is connected to the feed inlet of the first-stage plate evaporator 41.
[0030] The discharge outlet of the first-stage plate evaporator 41 is connected to the first-stage cyclone separator 51; the steam inlet of the first-stage plate evaporator 41 is connected to a fresh steam source and the steam outlet of the steam compressor 60; the steam outlet of the first-stage plate evaporator 41 is connected to a first-stage gas-liquid separator 70, the gas-phase outlet of the first-stage gas-liquid separator 70 is connected to the steam compressor 60, and its liquid-phase outlet is connected to the second preheater 20.
[0031] The gas-phase outlet of the first-stage cyclone separator 51 is connected to the steam compressor 60, and its liquid-phase outlet is connected to the second-stage plate evaporator 42.
[0032] The discharge outlet of the second-stage plate evaporator 42 is connected to the second-stage cyclone separator 52; the steam inlet of the second-stage plate evaporator 42 is connected to a fresh steam source 100 and the steam outlet of the steam compressor 60; the steam outlet of the second-stage plate evaporator 42 is connected to a second-stage gas-liquid separator 80, the gas-phase outlet of the second-stage gas-liquid separator 80 is connected to the steam compressor 60, and its liquid-phase outlet is connected to the second preheater 20.
[0033] The gas phase outlet and the liquid phase outlet of the second-stage cyclone separator 52 are respectively connected to the third-stage plate evaporator 43.
[0034] The discharge port of the third-stage plate evaporator 43 is connected to the third-stage cyclone separator 53; the steam outlet of the third-stage plate evaporator 43 is connected to the secondary gas-liquid separator 80.
[0035] The gas phase outlet of the third-stage cyclone separator 53 is connected to the first preheater 10, and its liquid phase outlet is the sodium hypophosphite concentrate outlet. The liquid phase outlet of the first preheater 10 is also connected to the condenser 90.
[0036] The working principle of the present utility model is as follows:
[0037] The sodium hypophosphite solution to be evaporated first enters the first preheater 10 and the second preheater 20 for preheating in sequence, and then enters the feed heat exchanger 30, where it is preheated by the compressed secondary steam and fresh steam, and then enters the first-stage plate evaporator 41. After being heated and boiled by the compressed secondary steam and fresh steam and vaporized, it forms a gas-liquid mixture and enters the first-stage cyclone separator 51. After the gas-liquid mixture is separated by the first-stage cyclone separator 51, the gas phase enters the MVR steam compressor 60, and the liquid phase enters the next-stage plate evaporator for heating and evaporation. The steam after being utilized by the feed preheater 30 and the first-stage plate evaporator 41 enters the primary gas-liquid separator 70 for separation. The gas phase of the primary gas-liquid separator 70 enters the MVR steam compressor 60, and the liquid phase is discharged from the system through the second preheater 20;
[0038] The sodium hypophosphite solution enters the second-stage plate evaporator 42 for heating and evaporation to form a gas-liquid mixture, and then enters the second-stage cyclone separator 52. After the gas-liquid mixture is separated by the second-stage cyclone separator 52, the gas phase enters the third-stage plate evaporator 43 for heat exchange, and the liquid phase enters the third-stage plate evaporator 43 for heating and evaporation. The steam after being utilized by the second-stage plate evaporator 42 enters the secondary gas-liquid separator 80 for separation. The gas phase of the secondary gas-liquid separator 80 enters the MVR steam compressor 60, and the liquid phase is discharged from the system through the second preheater 20;
[0039] The sodium hypophosphite solution enters the third-stage plate evaporator 43 for heating and evaporation to form a gas-liquid mixture, and then enters the third-stage cyclone separator 53. After the gas-liquid mixture is separated by the cyclone separator and evaporated to the specified concentration, the liquid phase is pumped to the next process, and the gas phase enters the condenser 90 after passing through the first preheater 10, and is condensed into water and discharged from the system after heat exchange. The non-condensable gas in the gas phase is pumped out of the system by a vacuum pump.
[0040] The present utility model can effectively utilize the secondary steam, reduce the consumption of fresh steam, and lower the energy consumption. Compared with the prior art, the energy consumption is saved by about 50%, and it has the advantages of high efficiency and energy saving.
[0041] The evaporation device of the present utility model has a small floor area, can effectively utilize the building space, reduces the use of high-temperature steam, and is beneficial to safe production.
[0042] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.
Claims
1. A sodium hypophosphite solution evaporation device, characterized in that, include: A preheater, a feed heat exchanger, an N-stage plate evaporator, an N-stage cyclone separator and a steam compressor, wherein N is a natural number greater than or equal to 3; The feed port of the preheater is connected to the sodium hypophosphite solution storage tank to be evaporated, and its discharge port is connected to the feed heat exchanger; the discharge port of the feed heat exchanger is connected to the feed port of the first-stage plate evaporator; the discharge port of the first-stage plate evaporator is connected to the first-stage cyclone separator; the gas phase outlet of the first-stage cyclone separator is connected to the steam compressor, and its liquid phase outlet is connected to the next-stage plate evaporator; The gas phase outlet and liquid phase outlet of the N-1 stage cyclone separator are both connected to the N stage plate evaporator; the gas phase outlet of the N stage cyclone separator is connected to the preheater, and its liquid phase outlet is the outlet of the evaporated sodium hypophosphite concentrate.
2. A sodium hypophosphite solution evaporation device according to claim 1, characterized in that, The steam inlet from the first-stage plate evaporator to the N-1-stage plate evaporator is connected to a fresh steam source and a steam outlet of the steam compressor.
3. A sodium hypophosphite solution evaporation device according to claim 2, characterized in that, The device also includes a primary gas-liquid separator; The steam outlets of the feed heat exchanger and the first-stage plate evaporator are connected to the first-stage gas-liquid separator, the gas phase outlet of the first-stage gas-liquid separator is connected to the steam compressor, and the liquid phase outlet thereof is connected to the preheater.
4. A sodium hypophosphite solution evaporation device according to claim 3, characterized in that: The device also includes a secondary gas-liquid separator; The steam outlet from the second-stage plate evaporator to the N-1-stage plate evaporator is connected to the secondary gas-liquid separator, the gas phase outlet of the secondary gas-liquid separator is connected to the steam compressor, and the liquid phase outlet is connected to the preheater.
5. A sodium hypophosphite solution evaporation device according to claim 4, characterized in that: The preheater comprises a first preheater and a second preheater; Wherein, the feed port of the first preheater is connected to the sodium hypophosphite solution storage tank to be evaporated, and the discharge port thereof is connected to the second preheater and the feed heat exchanger in sequence; The gas phase outlet of the Nth stage cyclone separator is connected to the first preheater, The liquid phase outlet of the secondary gas-liquid separator is connected to the second preheater.
6. A sodium hypophosphite solution evaporation device according to claim 5, characterized in that: The device further comprises a condenser, and the gas phase outlet of the first preheater is connected to the condenser.