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CN-117883799-B - Alkali liquor condensation assembly for indigo production line and method thereof

CN117883799BCN 117883799 BCN117883799 BCN 117883799BCN-117883799-B

Abstract

The invention discloses an alkali liquor condensation assembly for an indigo production line and a method thereof, and mainly relates to indigo production. The boiler comprises a triple-effect evaporation device, a preheating pot connected with the triple-effect evaporation device and a heat exchange evaporation device connected with the preheating pot through a pipeline, wherein the bottom of the heat exchange evaporation device is arranged in a boiler body, the heat exchange evaporation device comprises a heated part positioned at the bottom end of the heat exchange evaporation device, a heat exchange part positioned at the middle end of the heat exchange evaporation device and a feeding part positioned at the top end of the heat exchange evaporation device, and an overflow port is formed in the top end of the feeding part. The invention has the beneficial effects that the diluted alkali solution in the indigo production line is concentrated, the alkali solution is concentrated step by utilizing different heat exchange mediums, the heat exchange evaporation device is used for secondarily concentrating the alkali solution by utilizing the flue gas generated during combustion of the burner, and the evaporation efficiency of the heat exchange evaporation device is higher during concentration of the alkali solution by utilizing the film evaporation principle, so that the evaporated steam in the solution is recycled.

Inventors

  • PENG LIANGJUN
  • YIN YINGWU
  • SONG ZHIQING
  • XIANG YANLEI

Assignees

  • 山东还原新材料科技有限公司

Dates

Publication Date
20260505
Application Date
20240205

Claims (8)

  1. 1. An alkali liquor condensation assembly for an indigo production line is characterized by comprising a triple effect evaporation device (1), a preheating pot (2) connected with the triple effect evaporation device (1) and a heat exchange evaporation device (3) connected with the preheating pot (2) through a pipeline; The bottom of the heat exchange evaporation device (3) is arranged in the furnace body (4), the heat exchange evaporation device (3) comprises a heated part (5) positioned at the bottom end of the heat exchange evaporation device (3), a heat exchange part (6) positioned at the middle end of the heat exchange evaporation device (3) and a feeding part (7) positioned at the top end of the heat exchange evaporation device (3), and an overflow outlet (8) is formed in the top end of the feeding part (7); The feeding part (7) is connected with the preheating pot (2) through a pipeline, the combustion engine (9) is arranged at the bottom of the heating part (5) for heating, a discharging pipeline (10) is arranged at the bottom of the heating part (5), the heat exchange part (6) comprises an air inlet (11) positioned at the bottom end of the heat exchange part (6) and an air outlet (12) positioned at the top end of the heat exchange part (6), a plurality of heat exchange pipes (13) are arranged in the heat exchange part (6), a plurality of semicircular grooves (17) are arrayed on the heat exchange pipes (13), the bottom of the heat exchange pipes (13) are communicated with the heating part (5), the top of the heat exchange pipes (13) is communicated with the feeding part (7), alkali liquor circulates in the heat exchange pipes (13), a plurality of baffle plates (14) are arranged in a staggered manner in the heat exchange part (6), the outer wall of the heat exchange pipes (13) is provided with a descaling part, the descaling part is arranged in a mirror image mode by taking the plate (14) as a symmetrical surface, the descaling part comprises a negative pressure adsorption component and a plurality of descaling components (15) connected with the negative pressure adsorption component, and a plurality of flow channels (44) are arranged; Negative pressure airflow generated by the negative pressure adsorption component sucks ash from the flow channel cavity (44), meanwhile, air flows through the narrow flow channel cavity (44) at a high speed, the negative pressure airflow can rub on the suction inlet (36) and the wall surface of the flow channel cavity (44) to generate vibration, so that the descaling components (15) at different positions resonate on the heat exchange tube (13), a plurality of semicircular grooves (17) on the heat exchange tube (13) destroy the integral surface of the attached scale, and the connecting layer formed by the scale on the inner wall of the heat exchange tube (13) is destroyed, so that the scale is removed at a plurality of positions of the heat exchange tube (13).
  2. 2. The lye condensation assembly for an indigo production line according to claim 1, characterized in that the heat exchange part (6) is further provided with a fixing member for fixing a plurality of heat exchange tubes (13), the fixing member comprising a fixing plate (18), a plurality of distance tubes (19); The fixing plate (18) is divided into an upper part and a lower part, the fixing plate (18) is used for a plurality of two ends of the heat exchange tube (13), the two ends of the heat exchange tube (13) are exposed out of the fixing plate (18), and a plurality of baffle plates (14) are arranged on the distance tube (19).
  3. 3. The alkali liquor condensation assembly for the indigo production line according to claim 2, wherein the feeding part (7) is provided with a first feeding pipeline (21) and a second feeding pipeline (22) which are vertically distributed, and a nozzle of the second feeding pipeline (22) is provided with a flow guide pipe (23); a diversion assembly is arranged below the pipe orifice of the first feeding pipeline (21) at the upper part and comprises a diversion groove (24), a first grid plate (25) and a second grid plate (26) which are arranged below the diversion groove (24); The diversion channel (24) comprises a water storage channel (27) and a plurality of water discharging ports (28), a water discharging hole (29) is formed in the bottom of the water storage channel (27), a plurality of water passing holes (30) are formed in each of the first grid plate (25) and the second grid plate (26), the density of the water passing holes (30) of the second grid plate (26) is larger than that of the water passing holes (30) of the first grid plate (25), and the second grid plate (26) is connected with the diversion pipe (23).
  4. 4. An alkali liquor condensation assembly for an indigo production line according to any one of claims 1-3, characterized in that an overflow port (8) of the feeding portion (7) is connected with a recycling component, the recycling component is used for receiving steam (42) overflowed from the overflow port (8), the steam (42) is changed into condensed water, the interior of the heat exchange evaporation device (3) is in a negative pressure state, and the recycling component comprises a heat exchange piece (31), a tubular heat exchanger (32) connected with the heat exchange piece (31) and a recycling tank (33) connected with the tubular heat exchanger (32).
  5. 5. The lye condensation assembly for an indigo production line according to claim 4, wherein the descaling component (15) comprises a housing (34), a connection port (35) provided on the housing (34), and a plurality of suction ports (36) provided on the housing (34), the suction ports (36) being provided with gaps.
  6. 6. The lye condensation assembly for an indigo production line according to claim 1, wherein a receiving tank (41) is arranged in the furnace body (4), the receiving tank (41) is connected with a discharging pipeline (10), and a burner (9) is arranged at the bottom of the receiving tank (41) for heating.
  7. 7. The alkali liquor condensation assembly for the indigo production line according to claim 1, wherein the three-effect evaporation device (1) comprises three evaporators, the evaporators comprise a tubular heat exchanger (32) and an evaporation tower (37), steam (42) is introduced into the heat exchanger of the one-effect evaporator (38) to heat alkali liquor in the evaporation tower (37), the steam (42) generated after primary evaporation and external steam (42) are introduced into the heat exchanger of the two-effect evaporator (39) together, the alkali liquor after primary evaporation is pumped into the evaporation tower (37) of the two-effect evaporator (39), the steam (42) generated after secondary evaporation and the external steam (42) are introduced into the heat exchanger of the three-effect evaporator (40) together, the alkali liquor after secondary evaporation is pumped into the evaporation tower (37) of the three-effect evaporator (40), and the alkali liquor in the three-effect evaporation tower (37) is pumped into the preheating pot (2) after evaporation.
  8. 8. The method for using the alkali liquor condensation assembly for the indigo production line according to any one of claims 1 to 7, wherein S1, the alkali liquor which is not concentrated is primarily evaporated through a three-effect evaporator (40), the alkali liquor is pumped into a preheating pot (2) through a pump body after the preliminary evaporation is carried out through the three-effect evaporator (40), and then the alkali liquor is pumped into a heat exchange evaporation device (3) through the preheating pot (2); S2, the heat exchange evaporation device (3) carries out secondary evaporation on the alkali liquor subjected to primary evaporation, the alkali liquor is split by a feeding pipeline according to the flow rate and enters the heat exchange evaporation device (3), then flows into the upper fixing plate (18), and when the storage liquid level of the upper fixing plate (18) is higher than the distance of the heat exchange tube (13) leaking out of the upper fixing plate (18), the alkali liquor slowly flows into the inner wall of the heat exchange tube (13); S3, simultaneously heating the bottom of the heat receiving part (5) by the combustion engine (9), enabling flue gas generated by the combustion engine (9) to enter the heat exchange part (6) through the air inlet (11), heating alkali liquor in the heat exchange pipe (13) through the heat of the flue gas, enabling moisture in the alkali liquor in the heat exchange pipe (13) to evaporate, entering the heat receiving part (5) through the heat exchange pipe (13), pumping the alkali liquor collected at the bottom of the heat exchange pipe (13) into the receiving tank (41) through the discharging pipeline (10), and heating and concentrating the bottom of the receiving tank (41) by the combustion engine (9) until the alkali liquor is in a non-water state; S4, evaporating water in the alkali liquor in the heat exchange tube (13), overflowing the water from the overflow port (8) into a heat exchange piece (31) of the recycling assembly, enabling the interior of the heat exchange evaporation device (3) to be in a negative pressure state when the water becomes condensed water, and secondarily recycling the steam (42) entering the heat exchange piece (31) by the tube type heat exchanger (32) to enter the recycling tank (33); S5, when the dust in the heat exchange part (6) needs to be removed or cleaned, the negative pressure adsorption component is started, the negative pressure airflow generated by the adsorption component sucks the dust from the runner, meanwhile, air flows through the narrow runner cavity (44) at a high speed, the negative pressure airflow rubs on the wall surface of the runner cavity (44) to generate vibration, so that the dust is sucked and resonated with the heat exchange tube (13), the dust is sucked into the negative pressure adsorption component, and meanwhile, the scale on the inner wall of the vibrating heat exchange tube (13) is stripped.

Description

Alkali liquor condensation assembly for indigo production line and method thereof Technical Field The invention relates to the field of indigo production, in particular to an alkali liquor condensation assembly for an indigo production line and a method thereof. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. The method is characterized in that a large amount of alkali liquor is required to be used in an indigo production line, the low-concentration alkali liquor generated after the use is required to be recycled in the aspect of environmental protection, the alkali liquor is recycled after the evaporation and concentration are carried out on the alkali liquor, the bottom of a steamer is heated through a burner in the existing concentration method, redundant water in the alkali liquor in the steamer is evaporated, and the whole evaporation efficiency is low and the energy waste is serious because the heat exchange area of the steamer is only the bottom of the steamer in the evaporation process. And the existing steamer of the production line is open, so that after the alkali liquor is heated, the environment is polluted and heat loss is caused. In the conventional heating method, since the heating precipitation temperature of the alkali solution is 190 ℃, the alkali solution is precipitated at the bottom of the heating container to affect heating after being heated in the conventional manner, so that the direct heating manner is limited. So in order to further improve in the production line to alkali lye concentration efficiency and feature of environmental protection, so utilize the flue gas that produces when burning the combustor for alkali lye gets into the tubulation after, heats it through the flue gas, but two kinds of problems have appeared now need to solve it, firstly, because the hardness of alkali lye water, after the alkali lye heating condensation for a long time, can appear the incrustation scale layer in the heat transfer pipe, incrustation scale layer accumulation can influence heat exchange efficiency, so reduce 20% to the whole heat exchange efficiency of production line, so need clear up the incrustation scale layer of heat transfer pipe inside, but current heat transfer device inner space is limited and confined, and the inside spare part of heat transfer device is many can be corroded by chemical reagent, so many clearance modes are limited. 2. Because flue gas heats the tubulation in a unique space, after heating overlength, can form a large amount of smoke and dust in this space, can adhere to the heat transfer tube surface and influence the heat transfer to can also accumulate the mobility that influences flue gas in independent space, make the heat transfer tube of each part be heated unevenly, heat exchange efficiency influences very big after long-term accumulation, so the problem needs to be solved urgently. Disclosure of Invention The invention aims to provide an alkali liquor condensation assembly for an indigo production line and a method thereof, which can concentrate diluted alkali liquor in the indigo production line step by utilizing different heat exchange mediums, the heat exchange evaporation device can concentrate the alkali liquor secondarily by utilizing flue gas generated during combustion of a burner, and the heat exchange evaporation device has higher evaporation efficiency during concentration of the alkali liquor by utilizing a film evaporation principle, and can recycle steam evaporated in the solution in the whole concentration process. The invention aims to achieve the aim, and the aim is achieved by the following technical scheme: An alkali liquor condensation assembly for an indigo production line comprises a triple-effect evaporation device, a preheating pot connected with the triple-effect evaporation device, and a heat exchange evaporation device connected with the preheating pot through a pipeline; the bottom of the heat exchange evaporation device is arranged in the furnace body, the heat exchange evaporation device comprises a heated part positioned at the bottom end of the heat exchange evaporation device, a heat exchange part positioned at the middle end of the heat exchange evaporation device and a feeding part positioned at the top end of the heat exchange evaporation device, and an overflow port is formed in the top end of the feeding part; The heat exchange device comprises a preheating pot, a feeding part, a heating part, a discharging pipeline, a negative pressure adsorption component, a plurality of flow channel cavities, a plurality of negative pressure air flows generated by the negative pressure adsorption component, a plurality of semicircular grooves, a plurality of baffle plates, a scale removing component and a plurality of heat exchange layers, wherein the feeding part is connected with the preheating pot through a pipeline