Evaporation and concentration system for concentrating dilute corn steep liquor by using tube bundle drying waste heat

Abstract

The utility model discloses an evaporation and concentration system for concentrating dilute corn steep liquor by using waste heat of tube bundle drying, which comprises an absorption tower, a first flash evaporation system, a second flash evaporation system and an evaporation system, the heated primary water enters the first flash evaporation system to be subjected to flash evaporation to generate flash steam, steam condensate water flowing out of the tube bundle dryer enters the second flash evaporation system to generate flash steam, and the evaporation system utilizes the flash steam to evaporate and concentrate the dilute corn steep liquor, so that live steam required by evaporation and concentration of the dilute corn steep liquor is effectively reduced, and the concentration cost is reduced; and energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to corn starch production equipment technical field, concretely relates to a kind of evaporation concentration system for the concentration of dilute corn slurry in the drying process of corn germ, corn fiber and corn protein pipe bundle in the corn starch production process. BACKGROUND

[0002] Corn starch industry has developed into world's emerging industry, our country is the big country of corn processing industry, and the annual national corn starch output reaches 2600 million tons, and corn wet milling industry develops rapidly, which can effectively separate each part of kernel, produce high-purity starch and by-products.The processing method of wet production of corn starch is as follows: soaking, rough grinding, fine grinding (to germ extraction \ separation of fiber), separation of protein, starch washing and drying of starch, etc., to obtain high-purity starch product.

[0003] In the corn starch production process, corn soaking liquid, corn germ, corn fiber and corn protein are produced, the corn soaking liquid is dilute corn slurry, the concentrated corn slurry prepared after evaporation and concentration of dilute corn slurry can be used for producing feed, the corn germ can be used for producing corn oil after washing, dewatering and drying, the corn fiber can be used for producing fiber powder after dewatering, drying and crushing, and the corn protein can be produced into protein powder after concentration and drying.In the drying of corn germ, corn fiber and corn protein, the main drying method is to use live steam in the pipe bundle dryer, and a large amount of secondary steam and condensate water are generated in the pipe bundle dryer, which contains a large amount of waste heat, and direct discharge of secondary steam and condensate water will cause great energy waste and environmental pollution, and evaporation and concentration of dilute corn slurry also needs to consume a large amount of live steam, which leads to the consumption of a large amount of heat in the existing corn starch, high energy consumption, low energy utilization rate and high production cost. SUMMARY

[0004] In order to overcome the problems of the prior art, the utility model provides an evaporation concentration system for the concentration of dilute corn slurry by using the secondary steam generated in the drying process of corn germ, corn fiber and corn protein in the corn starch production process as the absorbing liquid, and the absorbing liquid after being heated enters the flash evaporation system for flash evaporation, the condensate water generated in the pipe bundle dryer enters the flash evaporation system for flash evaporation, and the flash evaporation steam generated by the absorbing liquid and the flash evaporation steam of condensate water are used for evaporation and concentration of dilute corn slurry, so as to effectively reduce the live steam required for evaporation and concentration of dilute corn slurry, reduce the concentration cost and energy consumption.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] An evaporation concentration system for concentrating dilute corn syrup by using waste heat of tube bundle dryer, characterized in that it comprises:

[0007] an absorption tower, an inlet of the absorption tower being connected with an outlet of the secondary steam of the tube bundle dryer, and a water inlet of the absorption tower being connected with a primary water source, the absorption tower absorbing heat from the secondary steam discharged from the tube bundle dryer by using the primary water,

[0008] a first flash evaporation system, a water inlet of the first flash evaporation system being connected with a water outlet of the absorption tower, the primary water heated by the secondary steam entering the first flash evaporation system to be flashed to generate flash steam,

[0009] a second flash evaporation system, a water inlet of the second flash evaporation system being connected with a condensate water outlet of the tube bundle dryer, the steam condensate water discharged from the tube bundle dryer entering the second flash evaporation system to be flashed to generate flash steam,

[0010] an evaporation system, an air inlet of the evaporation system being connected with flash steam outlets of the first flash evaporation system and the second flash evaporation system, an air outlet of the evaporation system being connected with an air inlet of a condenser, an air outlet of the condenser being connected with an air inlet of a vacuum pump set, and an air outlet of the vacuum pump set being connected with a vacuum,

[0011] a dilute corn syrup tank, a discharge outlet of the dilute corn syrup tank being connected with a feed inlet of the evaporation system through a feed pump and a pipeline, and a discharge outlet of the evaporation system being connected with a feed inlet of a concentrated corn syrup tank through a discharge pump and a discharge pipeline.

[0012] Further, the first flash evaporation system comprises a first flash tank, a second flash tank and a third flash tank connected in series along the flow direction of the primary water, a water inlet of the first flash tank being connected with a water outlet of the absorption tower, and a water outlet of the third flash tank being connected with a cleaning water inlet of the absorption tower,

[0013] the second flash evaporation system comprises a first-stage flash tank, a second-stage flash tank and a third-stage flash tank connected in series along the flow direction of the steam condensate water, a water inlet of the first-stage flash tank being connected with a condensate water outlet of the tube bundle dryer,

[0014] the evaporation system comprises a four-effect evaporator, a three-effect evaporator, a two-effect evaporator, an evaporator B and an evaporator A connected in series along the flow direction of the dilute corn syrup, a feed inlet of the four-effect evaporator being connected with a discharge outlet of the feed pump through a pipeline, and a discharge outlet of the evaporator A being connected with a feed inlet of the discharge pump through a pipeline,

[0015] the two-effect evaporator and the three-effect evaporator are both double-heating evaporators, the double-heating evaporators having a heater A and a heater B arranged in parallel, and the heater A and the heater B sharing a separator,

[0016] The flash steam outlet of the first flash tank is communicated with the gas inlet of the primary evaporator A, the flash steam outlet of the first flash tank is communicated with the gas inlet of the primary evaporator B, the secondary steam outlet of the primary evaporator A and the secondary steam outlet of the primary evaporator B are communicated with the gas inlet of the heater B of the secondary evaporator, the flash steam outlet of the secondary flash tank is communicated with the gas inlet of the heater A of the secondary evaporator,

[0017] The secondary steam outlet of the separator of the secondary evaporator and the flash steam outlet of the third flash steam are communicated with the gas inlet of the heater B of the tertiary evaporator, the flash steam outlet of the tertiary flash tank is communicated with the gas inlet of the heater A of the tertiary evaporator,

[0018] The secondary steam outlet of the separator of the tertiary evaporator is communicated with the gas inlet of the quaternary evaporator, the secondary steam outlet of the quaternary evaporator is communicated with the gas inlet of the condenser.

[0019] Further, the double-heating evaporator comprises a heater A, a heater B, a separator and a circulating pump, the heater A and the heater B are arranged in parallel, the lower part of the heater B has a lower cavity communicated with the tube passage, the lower cavity has a discharge port at the lower end and a separation outlet at the upper part of the lower cavity, the separation outlet of the lower cavity is communicated with the feed inlet of the separator, the discharge port at the lower end of the lower cavity is communicated with the feed inlet of the circulating pump, the discharge port of the circulating pump is communicated with the feed inlet of the upper end of the heater A and the feed inlet of the upper end of the heater B, the discharge port of the lower end of the heater A is communicated with the lower cavity of the heater B, and the discharge port of the circulating pump is used for discharging.

[0020] Further, a live steam system is further included, the live steam system comprises a steam pipeline, the steam pipeline is communicated with the gas inlet of the first flash tank, the gas inlet of the primary evaporator A and the gas inlet of the primary evaporator B,

[0021] A first flash temperature sensor is arranged on the pipeline communicated with the water outlet of the first flash tank and the water inlet of the second flash tank, a first flash gas inlet valve is arranged on the pipeline communicated with the gas inlet of the first flash tank, the first flash temperature sensor is electrically connected with the first flash gas inlet valve, and the first flash gas inlet valve is controlled and adjusted by the first flash temperature sensor,

[0022] A primary pressure sensor A is arranged on the heater of the primary evaporator A, a primary steam valve A is arranged on the pipeline communicated with the gas inlet of the primary evaporator A, the primary pressure sensor A is electrically connected with the primary steam valve A, and the primary steam valve A is controlled and adjusted by the primary pressure sensor A,

[0023] The secondary steam outlet of the primary evaporator B is provided with a primary pressure sensor B, the steam pipeline in communication with the gas inlet of the primary evaporator B is provided with a primary steam valve B, the primary pressure sensor B is electrically connected with the primary steam valve B, and the primary steam valve B is controlled and adjusted by the primary pressure sensor B.

[0024] Further, the pipeline in communication with the feed inlet of the four-effect evaporator is provided with a four-effect feed valve, the four-effect evaporator is provided with a four-effect liquid level meter, the four-effect liquid level meter is electrically connected with the four-effect feed valve, the four-effect feed valve is controlled and adjusted by the four-effect liquid level meter, the pipeline in communication with the feed inlet of the three-effect evaporator is provided with a three-effect feed valve, the three-effect evaporator is provided with a three-effect liquid level meter, the three-effect liquid level meter is electrically connected with the three-effect feed valve, the three-effect feed valve is controlled and adjusted by the three-effect liquid level meter, the pipeline in communication with the feed inlet of the two-effect evaporator is provided with a two-effect feed valve, the two-effect evaporator is provided with a two-effect liquid level meter, the two-effect liquid level meter is electrically connected with the two-effect feed valve, the two-effect feed valve is controlled and adjusted by the two-effect liquid level meter, the pipeline in communication with the feed inlet of the primary evaporator B is provided with a primary feed valve B, the primary evaporator B is provided with a primary liquid level meter B, the primary liquid level meter B is electrically connected with the primary feed valve B, the primary feed valve B is controlled and adjusted by the primary liquid level meter B, and the pipeline in communication with the feed inlet of the primary evaporator A is provided with a primary feed valve A, the primary evaporator A is provided with a primary liquid level meter A, the primary liquid level meter A is electrically connected with the primary feed valve A, and the primary feed valve A is controlled and adjusted by the primary liquid level meter A.

[0025] Further, the condensate outlet of the primary evaporator A is connected to the water inlet of the secondary flash tank through a pipeline.

[0026] Further, the water outlet of the tertiary flash tank is connected to the boiler room through a backwater pump and a backwater pipeline, the tertiary flash tank is provided with a tertiary liquid level meter, the backwater pipeline is provided with a backwater valve, the tertiary liquid level meter is electrically connected with the backwater valve, and the backwater valve is controlled and adjusted by the tertiary liquid level meter.

[0027] Further, the cleaning water outlet of the absorption tower is connected to the water inlet of the secondary condensate collecting tank, the water inlet of the secondary condensate collecting tank is also connected to the condensate outlets of the two-effect evaporator, the three-effect evaporator, the four-effect evaporator and the condenser, and the water outlet of the secondary condensate collecting tank is connected to the water inlet of the secondary condensate pump.

[0028] Further, the condensate outlet of the one-effect heater B is communicated with the water inlet of the first condensate collecting tank, the water outlet of the first condensate collecting tank is communicated with the water inlet of the second flash tank through the first condensate pump and the first condensate pipeline, the first condensate pipeline is provided with the first condensate valve, the first condensate collecting tank is provided with the first liquid level meter, the first liquid level meter is electrically connected with the first condensate valve, and the first condensate valve is controlled and adjusted through the first liquid level meter.

[0029] Further, the preheating system is further included, the preheating system includes a preheater, the gas inlet of the preheater is communicated with the gas outlet of the absorption tower, the gas outlet of the preheater is communicated with the tail gas treatment device, the feed inlet of the preheater is communicated with the water outlet of the corn soaking tank through a pump and a pipeline, the feed outlet of the preheater is communicated with the corn feeding water heater through a pump and a pipeline, or the feed inlet of the preheater is communicated with the feed outlet of the dilute corn slurry tank through a pump and a pipeline, and the feed outlet of the preheater is communicated with the dilute corn slurry tank through a reflux pump and a pipeline.

[0030] Further, the non-condensable gas outlets of the one-effect evaporator A, the one-effect evaporator B, the two-effect evaporator, the three-effect evaporator and the four-effect evaporator are all communicated with the gas inlet of the condenser.

[0031] The utility model has the advantages that:

[0032] The utility model discloses a kind of water as absorbing liquid to absorb secondary steam generated in the drying process of corn germ, corn fiber and corn protein in the production process of corn starch, absorbing liquid after heating enters flash system flash, condensate produced by tube bundle dryer enters flash system flash, using flash steam generated by absorbing liquid and condensate flash steam to evaporate and concentrate dilute corn slurry, so that the live steam required for dilute corn slurry evaporation concentration is effectively reduced, steam heat utilization rate is improved, concentration cost is reduced, energy consumption is reduced, so that the production cost of corn starch is effectively reduced, and enterprise market competitiveness is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is the structure schematic diagram of the utility model. DETAILED DESCRIPTION

[0034] The utility model will be further explained in detail in connection with the drawings.

[0035] As Figure 1The illustrated, a tube bundle drying waste heat concentration of dilute corn syrup evaporation concentration system, wherein: including absorption tower 1, the first flash system, the second flash system, the evaporation system, the live steam system and the cleaning system, the air inlet of the absorption tower 1 is connected with the secondary steam outlet of the tube bundle dryer, the water inlet of the absorption tower 1 is connected with the primary water source, the water outlet of the absorption tower 1 is connected with the water inlet of the first flash system, the absorption tower 1 absorbs the heat in the secondary steam discharged by the tube bundle dryer with primary water as the absorption water, the first flash system includes the first flash tank 2, the second flash tank 3 and the third flash tank 4 connected in series along the flow direction of the primary water, the water inlet of the first flash tank 2 is connected with the water outlet of the absorption tower 1, the water outlet of the third flash tank 4 is connected with the cleaning water inlet of the absorption tower 1 through the washing pump 30 and the pipeline, and the cleaning water outlet of the absorption tower 1 is connected with the water inlet of the second condensate water collecting tank 26.

[0036] The second flash system includes the first-stage flash tank 5, the second-stage flash tank 6 and the third-stage flash tank 7 connected in series along the flow direction of the steam condensate water, the water inlet of the first-stage flash tank 5 is connected with the condensate water outlet of the tube bundle dryer, the water outlet of the third-stage flash tank 7 is connected with the boiler house through the backwater pump 31 and the backwater pipeline, the third-stage flash tank 7 is provided with the third-stage liquid level meter 33, the backwater pipeline is provided with the backwater valve 32, the third-stage liquid level meter 33 is electrically connected with the backwater valve 32, and the backwater valve 32 is controlled and adjusted by the third-stage liquid level meter 33.

[0037] The evaporation system includes the four-effect evaporator, the three-effect evaporator, the two-effect evaporator, the one-effect evaporator B and the one-effect evaporator A connected in series along the flow direction of the dilute corn syrup, the four-effect evaporator includes the four-effect heater 22, the four-effect separator 23 and the four-effect circulating pump 24, the feed inlet of the four-effect heater 22 connected with the tube side is connected with the discharge outlet of the feed pump 25 through the pipeline, the feed inlet of the feed pump 25 is connected with the dilute corn syrup tank 34, the lower part of the four-effect heater 22 has a lower cavity connected with the tube side, the discharge outlet at the lower end of the lower cavity is connected with the feed inlet of the four-effect circulating pump 24, the separation outlet at the upper part of the lower cavity is connected with the feed inlet of the four-effect separator 23, the separated liquid outlet of the four-effect separator 23 is connected with the feed inlet of the four-effect circulating pump 24, and the discharge outlets of the four-effect circulating pump 24 are respectively connected with the feed inlets of the upper end of the four-effect heater 22 and the three-effect evaporator through the pipelines. The four-effect liquid level meter 36 is arranged on the lower cavity of the four-effect heater 22, the pipeline, through which the feed pump 25 is connected with the feed inlet of the four-effect heater 22, is provided with the four-effect feed valve 35, and the four-effect liquid level meter 36 is electrically connected with the four-effect feed valve 35, so that the four-effect feed valve 35 is controlled and adjusted by the four-effect liquid level meter 36.

[0038] The three-effect evaporator comprises a three-effect heater A 18, a three-effect heater B 19, a three-effect separator 20 and a three-effect circulating pump 21. The three-effect heater A 18 and the three-effect heater B 19 are arranged in parallel. The lower part of the three-effect heater B 19 is provided with a lower cavity in communication with the tube pass. The lower cavity is provided with a discharge port at the lower end and a separation outlet at the upper part of the lower cavity. The separation outlet of the lower cavity is in communication with the feed inlet of the three-effect separator 20. The separation liquid outlet of the three-effect separator 20 is in communication with the feed inlet of the three-effect circulating pump 21. The discharge port at the lower end of the lower cavity is in communication with the feed inlet of the three-effect circulating pump 21. The discharge port at the lower end of the three-effect heater A 18 is in communication with the lower cavity of the three-effect heater B 19. The feed inlet of the three-effect circulating pump 21 is in communication with the discharge port of the four-effect circulating pump 24 through a pipeline. The pipeline is provided with a three-effect feed valve 38. The three-effect liquid level meter 37 is arranged in the lower cavity of the three-effect heater B 19. The three-effect liquid level meter 37 is in communication with the three-effect feed valve 38. The three-effect feed valve 38 is adjusted and controlled by the three-effect liquid level meter 37. The discharge port of the three-effect circulating pump 21 is in communication with the feed inlet of the upper end of the three-effect heater A 18 and the feed inlet of the upper end of the three-effect heater B 19 and the feed inlet of the two-effect evaporator.

[0039] The two-effect evaporator comprises a two-effect heater A 14, a two-effect heater B 15, a two-effect separator 17 and a two-effect circulating pump 16. The two-effect heater A 14 and the two-effect heater B 15 are arranged in parallel. The lower part of the two-effect heater B 15 is provided with a lower cavity in communication with the tube pass. The lower cavity is provided with a discharge port at the lower end and a separation outlet at the upper part of the lower cavity. The separation outlet of the lower cavity is in communication with the feed inlet of the two-effect separator 17. The separation liquid outlet of the two-effect separator 17 is in communication with the feed inlet of the two-effect circulating pump 16. The discharge port at the lower end of the lower cavity is in communication with the feed inlet of the two-effect circulating pump 16. The discharge port at the lower end of the two-effect heater A 14 is in communication with the lower cavity of the two-effect heater B 15. The feed inlet of the two-effect circulating pump 16 is in communication with the discharge port of the three-effect circulating pump 21 through a pipeline. The pipeline is provided with a two-effect feed valve 40. The two-effect liquid level meter 39 is arranged in the lower cavity of the two-effect heater B 15. The two-effect liquid level meter 39 is in communication with the two-effect feed valve 40. The two-effect feed valve 40 is adjusted and controlled by the two-effect liquid level meter 39. The discharge port of the two-effect circulating pump 16 is in communication with the feed inlet of the upper end of the two-effect heater A 14 and the feed inlet of the upper end of the two-effect heater B 15 and the feed inlet of the one-effect evaporator B.

[0040] The first evaporator B comprises a first heater B11, a first separator B12 and a first circulating pump B13. The feed inlet of the first heater B11 in communication with the tube passage thereof is connected by a pipeline to the discharge outlet of the second circulating pump 16. A first feed valve B42 is arranged on the pipeline connecting the feed inlet of the first heater B11 to the discharge outlet of the second circulating pump 16. The lower part of the first heater B11 has a lower cavity in communication with the tube passage thereof. The discharge outlet at the lower end of the lower cavity is connected to the feed inlet of the first circulating pump B13. The separation outlet at the upper part of the lower cavity is connected to the feed inlet of the first separator B12. The separated liquid outlet of the first separator B12 is connected to the feed inlet of the first circulating pump B13. The discharge outlet of the first circulating pump B13 is connected by a pipeline to the feed inlet of the upper end of the first heater B11 and the feed inlet of the first heater A8, respectively. A first liquid level meter B41 is arranged on the lower cavity of the first heater B11. The first liquid level meter B41 is electrically connected to the first feed valve B42. The first feed valve B42 is controlled by the first liquid level meter B41.

[0041] The first evaporator A comprises a first heater A8, a first separator A9 and a discharge pump 10. The feed inlet of the first heater A8 in communication with the tube passage thereof is connected by a pipeline to the discharge outlet of the first circulating pump B13. A first feed valve A44 is arranged on the pipeline connecting the feed inlet of the first heater A8 to the discharge outlet of the first circulating pump B13. The discharge outlet at the lower end of the first heater A8 in communication with the tube passage thereof is connected to the feed inlet of the first separator A9. The separated liquid outlet of the first separator A9 is connected to the feed inlet of the discharge pump 10. The discharge outlet of the discharge pump 10 is connected by a pipeline to the feed inlet of the first heater A8 and a discharge pipeline, respectively. A discharge valve 43 is arranged on the discharge pipeline. A first liquid level meter A45 is arranged on the first separator A9. The first liquid level meter A45 is electrically connected to the first feed valve A44. The first feed valve A44 is controlled by the first liquid level meter A45.

[0042] The flash steam outlet of the first flash tank 5 is communicated with the gas inlet of the first effect heater A8, the flash steam outlet of the first flash tank 2 is communicated with the gas inlet of the first effect heater B11, the secondary steam outlet of the first effect separator A9 and the secondary steam outlet of the first effect separator B12 are communicated with the gas inlet of the second effect heater B15, the flash steam outlet of the second flash tank 6 is communicated with the gas inlet of the second effect heater A14, the secondary steam outlet of the second effect separator 17 and the flash steam outlet of the third flash tank 4 are communicated with the gas inlet of the third effect heater B19, the flash steam outlet of the third flash tank 7 is communicated with the gas inlet of the third effect heater A18, the secondary steam outlet of the third effect separator 20 is communicated with the gas inlet of the fourth effect heater 22, the secondary steam outlet of the fourth effect separator 23 is communicated with the gas inlet of the condenser 27, the non-condensed gas outlet of the first effect heater A8, the non-condensed gas outlet of the first effect heater B11, the non-condensed gas outlet of the second effect heater A14, the non-condensed gas outlet of the second effect heater B15, the non-condensed gas outlet of the third effect heater A18, the non-condensed gas outlet of the second effect heater A14, the non-condensed gas outlet of the fourth effect heater 22 are all communicated with the gas inlet of the condenser 27, the gas outlet of the condenser 27 is communicated with the gas inlet of the vacuum pump group 28, and the gas outlet of the vacuum pump group 28 is exhausted. The gas inlet of the first flash tank 2, the gas inlet of the first effect heater A8 and the gas inlet of the first effect heater B11 are respectively communicated with the steam pipeline through the pipeline, the pipeline communicated with the gas inlet of the first flash tank 2 and the gas inlet of the first effect heater A8 and the gas inlet of the first effect heater B11 is provided with the first flash temperature sensor 46, the pipeline communicated with the gas inlet of the first flash tank 2 is provided with the first flash gas valve 47, the first flash temperature sensor 46 is electrically connected with the first flash gas valve 47, the first flash gas valve 47 is controlled and adjusted by the first flash temperature sensor 46, the first effect pressure sensor A48 is arranged on the first effect heater A8, the pipeline communicated with the gas inlet of the first effect heater A8 is provided with the first effect steam valve A49, the first effect pressure sensor A48 is electrically connected with the first effect steam valve A49, the first effect steam valve A49 is controlled and adjusted by the first effect pressure sensor A48, the secondary steam outlet of the first effect heater B11 is provided with the first effect pressure sensor B51, the pipeline communicated with the gas inlet of the first effect heater B11 is provided with the first effect steam valve B50, the first effect pressure sensor B51 is electrically connected with the first effect steam valve B50, the first effect steam valve B50 is controlled and adjusted by the first effect pressure sensor B51.

[0043] The preheating system comprises a preheater 52, the gas inlet of the preheater 52 is communicated with the gas outlet of the absorption tower 1, the gas outlet of the preheater 52 is communicated with the tail gas treatment device, the feed inlet of the preheater 52 is communicated with the water outlet of the corn soaking tank 53 through a corn feed water preheating pump 54 and a pipeline, the feed outlet of the preheater 52 is communicated with the corn feed water heater 56 through a corn feed water delivery pump 55 and a pipeline, or the feed inlet of the preheater 52 is communicated with the feed outlet of the dilute corn slurry tank 34 through a dilute corn slurry preheating delivery pump 57 and a pipeline, and the feed outlet of the preheater 52 is communicated with the dilute corn slurry tank 34 through a backflow pump 58 and a pipeline.

[0044] The condensate water outlet of the one-effect heater B is communicated with the water inlet of the first condensate water collecting tank 65, the water outlet of the first condensate water collecting tank 65 is communicated with the water inlet of the second flash tank 3 through a first condensate water pump 66 and a first condensate water pipeline, a first condensate water valve 67 is arranged on the first condensate water pipeline, a first liquid level meter 68 is arranged on the first condensate water collecting tank 65, the first liquid level meter 68 is electrically connected with the first condensate water valve 67, and the first condensate water valve 67 is controlled and adjusted through the first liquid level meter 68. The condensate water outlet of the one-effect heater A8 is communicated with the water inlet of the second flash tank 6 through a pipeline. The water inlet of the second condensate water collecting tank 26 is also communicated with the condensate water outlets of the two-effect evaporator, the three-effect evaporator, the four-effect evaporator and the condenser 27, and the water outlet of the second condensate water collecting tank 26 is communicated with the water inlet of the second condensate water pump 60.

[0045] The cleaning system comprises a sewage tank 59, an acid liquid tank 61, an alkali liquid tank 62 and a cleaning water tank 63 arranged in parallel, the water inlet of the cleaning water tank 63 is communicated with the water outlet of the second condensate water pump 60, the water outlet of the sewage tank 59, the liquid outlet of the acid liquid tank 61, the liquid outlet of the alkali liquid tank 62 and the water outlet of the cleaning water tank 63 are respectively communicated with the inlet of a cleaning pump 64 through pipelines and valves, the outlet of the cleaning pump 64 is communicated with the feed outlet of the feed pump 25 through a cleaning pipeline and a valve, the outlet of the cleaning pump 64 is communicated with a sewage treatment system through a drainage pipeline and a valve, the feed outlet of the discharge pump 10 is communicated with the inlet of the sewage tank 59 through a sewage pipeline and a valve, the feed outlet of the discharge pump 10 is communicated with the feed inlet of the dilute corn slurry tank 34 through a cleaning backwater pipeline and a valve, and the feed outlet of the discharge pump 10 is communicated with the feed outlet of the feed pump 25 through a cleaning circulation pipeline and a valve.

[0046] In use, the secondary steam generated by the tube bundle drier in the drying process of corn germ, corn fiber and corn protein in the corn starch production process enters the gas inlet at the lower part of the absorption tower 1, and the primary water enters the water inlet at the upper part of the absorption tower 1. The primary water flows from top to bottom, and the secondary steam flows from bottom to top. In the flowing process, the primary water absorbs the heat in the secondary steam, and the primary water is heated. The heated primary water enters the first flash tank 2 to flash to generate first flash steam. Under the action of the vacuum pump set 28, the first flash steam enters the shell side of the one-effect heater B11 of the one-effect evaporator B. The primary water after the first flash of the first flash tank 2 enters the second flash tank 3 to flash, generating second flash steam. The second flash steam enters the shell side of the two-effect heater B15 of the two-effect evaporator. The primary water after the third flash of the third flash tank 3 enters the third flash tank 4 to flash, generating third flash steam. The third flash steam enters the shell side of the three-effect heater B19 of the three-effect evaporator.

[0047] The steam condensate flowing out of the tube bundle drier enters the first flash tank 5 to flash, generating first flash steam. The first flash steam enters the shell side of the one-effect heater A8 of the one-effect evaporator A. The steam condensate after the first flash of the first flash tank 5 enters the second flash tank 6 to flash, generating second flash steam. The second flash steam enters the shell side of the two-effect heater A14 of the two-effect evaporator. The condensate after the second flash of the second flash tank 6 enters the third flash tank 7 to flash, generating third flash steam. The third flash steam enters the shell side of the three-effect heater A18 of the three-effect evaporator. The secondary steam flowing out of the one-effect separator A9 of the one-effect evaporator A and the secondary steam flowing out of the one-effect separator B12 of the one-effect evaporator B enter the shell side of the two-effect heater B15 of the two-effect evaporator. The secondary steam separated by the two-effect separator 17 of the two-effect evaporator enters the shell side of the three-effect heater B19 of the three-effect evaporator. The secondary steam separated by the three-effect separator 20 of the three-effect evaporator enters the shell side of the four-effect heater 22 of the four-effect evaporator. The secondary steam outlet of the four-effect separator 23 of the four-effect evaporator enters the condenser 27 to condense. After condensation, the tail gas is exhausted by the vacuum pump set 28.

[0048] The dilute corn syrup in the dilute corn syrup tank 34 enters the tube passage of the four-effect heater 22 of the four-effect evaporator under the action of the feed pump 25, the four-effect circulating pump 24 is started, and the dilute corn syrup flows in the four-effect evaporator under the action of the four-effect circulating pump 24, the dilute corn syrup is subjected to first evaporation concentration in the four-effect heater 22 by using the secondary steam separated out of the three-effect separator 20 of the three-effect evaporator, the dilute corn syrup subjected to first evaporation concentration enters the tube passage of the three-effect heater A 18 and the three-effect heater B 19 of the three-effect evaporator, the three-effect circulating pump 21 is started, and the dilute corn syrup subjected to first evaporation concentration is subjected to second evaporation concentration in the three-effect evaporator by using the secondary steam generated by the two-effect evaporator and the flash steam flowing out of the third flash tank 7, the dilute corn syrup subjected to second evaporation concentration enters the tube passage of the two-effect heater A 14 and the two-effect heater B 15 of the two-effect evaporator, the two-effect circulating pump 16 is started, and the dilute corn syrup subjected to second evaporation concentration is subjected to third evaporation concentration by using the secondary steam flowing out of the one-effect separator B 12 of the one-effect evaporator B, the secondary steam flowing out of the one-effect separator A 9 of the one-effect evaporator A, the secondary flash steam flashed out of the second flash tank 3 and the second flash steam flashed out of the second flash tank 3 of the two-effect evaporator, the dilute corn syrup subjected to third evaporation concentration enters the tube passage of the one-effect heater B 11 of the one-effect evaporator B, the one-effect evaporator B subjects the dilute corn syrup subjected to third evaporation concentration to fourth evaporation concentration by using the first flash steam flashed out of the first flash tank 2, the dilute corn syrup subjected to fourth evaporation concentration enters the tube passage of the one-effect heater A 8 of the one-effect evaporator A, the one-effect evaporator A subjects the dilute corn syrup subjected to fourth evaporation concentration to fifth evaporation concentration by using the first flash steam flashed out of the first flash tank 5, the dilute corn syrup subjected to five evaporation concentrations becomes thick corn syrup, the discharge pump 10 is started, and the thick corn syrup enters the thick syrup tank 29 through the discharge pipeline and is stored.

[0049] The utility model discloses utilize steam delivery pipeline to deliver live steam to the tube passage of the one-effect heater A 8 of the one-effect evaporator A, the one-effect heater B 11 of the one-effect evaporator B and the first flash tank 2, utilize live steam to supplement steam for the evaporation system.

[0050] The tail gas of the secondary steam from the tube bundle dryer is absorbed by the primary water from the outlet of the absorption tower 1, and then flows into the shell side of the preheater 52. The corn soaking water from the corn soaking tank 53 flows into the tube side of the preheater 52 under the action of the corn soaking water preheating pump 54. In the preheater 52, the tail gas from the absorption tower 1 is used to preheat the corn soaking water. The preheated corn soaking water flows into the corn soaking water heater 56 under the action of the corn soaking water conveying pump 55, and is heated by the live steam. Then, the corn soaking water flows into the soaking tank. Alternatively, the dilute corn slurry is sent into the tube side of the preheater 52 by the dilute corn slurry preheating conveying pump 57, and is preheated by the tail gas from the absorption tower 1. The preheated dilute corn slurry flows back into the dilute corn slurry tank 34 under the action of the backflow pump 58, so as to preheat the dilute corn slurry. The preheated dilute corn slurry can flow into the evaporation system under the action of the feeding pump 25 to be evaporated and concentrated.

[0051] The condensate water in the second condensate water collecting tank 26 flows into the cleaning water tank 63 under the action of the second condensate water pump 60. When the system needs to be cleaned, the cleaning pump 64 and the valve on the cleaning pipeline are started, the water outlet of the cleaning water tank 63 is opened, and the condensate water in the cleaning water tank 63 flows into the evaporation system under the action of the cleaning pump 64, so as to wash the evaporation system along the flow direction of the dilute corn slurry. The washing water flows into the dilute corn slurry tank 34 along the cleaning backwater pipeline under the action of the feeding pump 10. After washing, the water outlet of the cleaning water tank 63 is closed, the liquid outlet of the lye tank 62 is opened, and the lye in the lye tank 62 flows into the evaporation system under the action of the cleaning pump 64, so as to use the lye to alkaline wash the evaporation system. The lye flows into the sewage tank 59 under the action of the feeding pump 10 after alkaline washing. After alkaline washing, the liquid outlet of the lye tank 62 is closed, the water outlet of the acid tank 61 is opened, and the acid in the acid tank 61 flows into the evaporation system, so as to use the acid to acid wash the evaporation system. The acid flows into the sewage tank 59 under the action of the feeding pump 10 after acid washing. After acid washing, the water outlet of the acid tank 61 is closed, and then the water outlet of the sewage tank 59 is opened. The washing waste water in the sewage tank 59 flows into the sewage treatment system under the action of the cleaning pump 64 for sewage treatment.

[0052] It should be noted that the above-mentioned embodiments are used to illustrate but not limit the technical scheme of the present application. Any equivalent replacement or other modification made by those skilled in the art based on the prior art should be included in the scope of the present application.

Claims

1. An evaporative concentration system for the concentration of dilute corn steep liquor using a tube bundle dryer waste heat, characterized by: It comprises: an absorption tower, the gas inlet of which is connected with the secondary steam outlet of the bundle dryer, and the water inlet of which is connected with the primary water source, the absorption tower absorbing the heat of the secondary steam discharged by the bundle dryer with the primary water, a first flash system, the water inlet of which is connected with the water outlet of the absorption tower, the primary water heated by the secondary steam entering the first flash system to flash and produce flash steam, a second flash system, the water inlet of which is connected with the condensed water outlet of the bundle dryer, the condensed steam discharged by the bundle dryer entering the second flash system to flash and produce flash steam, an evaporation system, the gas inlet of which is connected with the flash steam outlets of the first and second flash systems, the gas outlet of which is connected with the gas inlet of the condenser, the gas outlet of the condenser is connected with the gas inlet of the vacuum pump group, and the gas outlet of the vacuum pump group is exhausted, the outlet of the dilute corn syrup tank is connected with the inlet of the evaporation system through the feed pump and pipeline, and the outlet of the evaporation system is connected with the inlet of the concentrated syrup tank through the discharge pump and discharge pipeline.

2. The evaporative concentration system for concentrating dilute cornstarch wastewater using a tube bundle dryer according to claim 1, characterized in that: The first flash system comprises a first flash tank, a second flash tank and a third flash tank connected in series along the flow direction of the primary water, the water inlet of the first flash tank is connected with the water outlet of the absorption tower, and the water outlet of the third flash tank is connected with the cleaning water inlet of the absorption tower, The second flash system comprises a first flash tank, a second flash tank and a third flash tank connected in series along the flow direction of the steam condensed water, the water inlet of the first flash tank is connected with the condensed water outlet of the bundle dryer, The evaporation system comprises a four-effect evaporator, a three-effect evaporator, a two-effect evaporator, a one-effect evaporator B and a one-effect evaporator A connected in series along the flow direction of the dilute corn syrup, the inlet of the four-effect evaporator is connected with the outlet of the feed pump through the pipeline, and the outlet of the one-effect evaporator A is connected with the inlet of the discharge pump, The two-effect evaporator and the three-effect evaporator are both double-heating evaporators, which have a heater A and a heater B arranged in parallel, and the heater A and the heater B share a separator, the flash steam outlet of the first flash tank is connected with the gas inlet of the one-effect evaporator A, the flash steam outlet of the first flash tank is connected with the gas inlet of the one-effect evaporator B, the secondary steam outlets of the one-effect evaporators A and B are connected with the gas inlet of the heater B of the two-effect evaporator, and the flash steam outlet of the second flash tank is connected with the gas inlet of the heater A of the two-effect evaporator, the secondary steam outlet of the separator of the two-effect evaporator and the flash steam outlet of the third flash tank are connected with the gas inlet of the heater B of the three-effect evaporator, and the flash steam outlet of the third flash tank is connected with the gas inlet of the heater A of the three-effect evaporator, the secondary steam outlet of the separator of the three-effect evaporator is connected with the gas inlet of the four-effect evaporator, and the secondary steam outlet of the four-effect evaporator is connected with the gas inlet of the condenser.

3. The evaporative concentration system for the concentration of dilute cornstarch wastewater using a tube bundle dryer according to claim 2, characterized in that: The double heating evaporator comprises a heater A, a heater B, a separator and a circulating pump, the heater A and the heater B are arranged in parallel, the lower part of the heater B is provided with a lower cavity in communication with the tube passage, the lower cavity is provided with a discharge port at the lower end and a separation outlet at the upper part of the lower cavity, the separation outlet of the lower cavity is in communication with the feed inlet of the separator, the discharge port at the lower end of the lower cavity is in communication with the feed inlet of the circulating pump, the discharge port of the circulating pump is in communication with the feed inlet of the upper end of the heater A and the feed inlet of the upper end of the heater B, the discharge port of the lower end of the heater A is in communication with the lower cavity of the heater B, and the discharge port of the circulating pump is used for discharging.

4. The evaporative concentration system for concentration of dilute cornstarch slurry using tube bundle dryer waste heat as claimed in claim 2, wherein: A live steam system is further included, the live steam system comprises a steam pipeline, the steam pipeline is in communication with the gas inlet of the first flash tank, the gas inlet of the primary evaporator A and the gas inlet of the primary evaporator B, A first flash temperature sensor is arranged on the pipeline in communication with the water outlet of the first flash tank and the water inlet of the second flash tank, a first flash gas inlet valve is arranged on the pipeline in communication with the gas inlet of the first flash tank, the first flash temperature sensor is electrically connected with the first flash gas inlet valve, and the first flash gas inlet valve is controlled by the first flash temperature sensor, A primary pressure sensor A is arranged on the heater of the primary evaporator A, a primary steam valve A is arranged on the pipeline in communication with the gas inlet of the primary evaporator A, the primary pressure sensor A is electrically connected with the primary steam valve A, and the primary steam valve A is controlled by the primary pressure sensor A, A secondary steam outlet of the primary evaporator B is provided with a primary pressure sensor B, a primary steam valve B is arranged on the pipeline in communication with the gas inlet of the primary evaporator B, the primary pressure sensor B is electrically connected with the primary steam valve B, and the primary steam valve B is controlled by the primary pressure sensor B. A secondary steam outlet of the primary evaporator B is provided with a primary pressure sensor B, a primary steam valve B is arranged on the pipeline in communication with the gas inlet of the primary evaporator B, the primary pressure sensor B is electrically connected with the primary steam valve B, and the primary steam valve B is controlled by the primary pressure sensor B.

5. The evaporative concentration system for the concentration of dilute cornstarch wastewater using a tube bundle dryer according to claim 2, characterized in that: The pipeline, which communicates the feed pump with the feed inlet of the four-effect evaporator, is provided with a four-effect feed valve, the four-effect evaporator is provided with a four-effect liquid level meter, the four-effect liquid level meter is electrically connected with the four-effect feed valve, the four-effect feed valve is adjusted and controlled through the four-effect liquid level meter, the pipeline, which communicates the discharge outlet of the four-effect evaporator with the feed inlet of the three-effect evaporator, is provided with a three-effect feed valve, the three-effect evaporator is provided with a three-effect liquid level meter, the three-effect liquid level meter is electrically connected with the three-effect feed valve, the three-effect feed valve is adjusted and controlled through the three-effect liquid level meter, the pipeline, which communicates the discharge outlet of the three-effect evaporator with the feed inlet of the two-effect evaporator, is provided with a two-effect feed valve, the two-effect evaporator is provided with a two-effect liquid level meter, the two-effect liquid level meter is electrically connected with the two-effect feed valve, the two-effect feed valve is adjusted and controlled through the two-effect liquid level meter, the pipeline, which communicates the discharge outlet of the two-effect evaporator with the feed inlet of the one-effect evaporator B, is provided with a one-effect feed valve B, the one-effect evaporator B is provided with a one-effect liquid level meter B, the one-effect liquid level meter B is electrically connected with the one-effect feed valve B, the one-effect feed valve B is adjusted and controlled through the one-effect liquid level meter B, the pipeline, which communicates the discharge outlet of the one-effect evaporator B with the feed inlet of the one-effect evaporator A, is provided with a one-effect feed valve A, the one-effect evaporator A is provided with a one-effect liquid level meter A, the one-effect liquid level meter A is electrically connected with the one-effect feed valve A, the one-effect feed valve A is adjusted and controlled through the one-effect liquid level meter A.

6. The evaporative concentration system for the concentration of dilute cornstarch slurry using a tube bundle dryer waste heat according to claim 2, characterized in that: The condensate outlet of the one-effect evaporator A is connected with the water inlet of the secondary flash tank through a pipeline.

7. The evaporative concentration system for the concentration of dilute cornstarch wastewater using a tube bundle dryer according to claim 2, characterized by: The water outlet of the tertiary flash tank is connected with the boiler room through a backwater pump and a backwater pipeline, the tertiary flash tank is provided with a tertiary liquid level meter, the backwater pipeline is provided with a backwater valve, the tertiary liquid level meter is electrically connected with the backwater valve, and the backwater valve is adjusted and controlled through the tertiary liquid level meter.

8. The evaporative concentration system for the concentration of dilute cornstarch wastewater using a tube bundle dryer according to claim 2, characterized by: The cleaning water outlet of the absorption tower is connected with the water inlet of the secondary condensate collecting tank, the water inlet of the secondary condensate collecting tank is also connected with the condensate outlets of the two-effect evaporator, the three-effect evaporator, the four-effect evaporator and the condenser, and the water outlet of the secondary condensate collecting tank is connected with the water inlet of the second condensate pump.

9. The evaporative concentration system for the concentration of dilute cornstarch wastewater using a tube bundle dryer according to claim 2, characterized by: The condensate outlet of the one-effect heater B is connected with the water inlet of the first condensate collecting tank, the water outlet of the first condensate collecting tank is connected with the water inlet of the secondary flash tank through a first condensate pump and a first condensate pipeline, the first condensate pipeline is provided with a first condensate valve, the first condensate collecting tank is provided with a first liquid level meter, the first liquid level meter is electrically connected with the first condensate valve, and the first condensate valve is adjusted and controlled through the first liquid level meter.

10. The evaporative concentration system for concentrating dilute cornstarch wastewater by using a tube bundle dryer according to any one of claims 1 to 9, characterized in that: The preheating system comprises a preheater, the gas inlet of the preheater is connected with the gas outlet of the absorption tower, the gas outlet of the preheater is connected with the tail gas treatment device, the feed inlet of the preheater is connected with the water outlet of the corn soaking tank through a pump and a pipeline, the discharge outlet of the preheater is connected with the corn feeding water heater through a pump and a pipeline, or the feed inlet of the preheater is connected with the discharge outlet of the dilute corn slurry tank through a pump and a pipeline, and the discharge outlet of the preheater is connected with the dilute corn slurry tank through a reflux pump and a pipeline.

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