Acidic water heat exchange treatment system
By installing steam purging and water flushing pipelines on the heat exchanger of the acidic water stripping unit, the problem of fouling accumulation in the heat exchanger is solved, enabling long-term operation of the unit and energy saving.
Patent Information
- Application Number
- CN202520300805.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-02-24
AI Technical Summary
In existing acidic water stripping units, the accumulation of fouling on the heat exchangers leads to reduced heat exchange efficiency, affecting the quality of purified water and the operation of the unit, requiring frequent shutdowns for cleaning, and resulting in a shortened production cycle.
Steam purging lines and water flushing lines are installed on the heat exchangers to clean the scale using steam and water respectively. Multiple heat exchanger groups are operated alternately to avoid scale accumulation and extend the operating cycle of the unit.
By using steam and water cleaning measures, heat exchange efficiency is maintained, the operating cycle of the acid water stripping unit is extended, and energy consumption and operating costs are reduced.
Smart Images
Figure CN223856290U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to acid water stripping tower technical field, concretely relates to a kind of acid water heat exchange treatment systems. BACKGROUND
[0002] In oil refining chemical production device, acid water stripping device is used to handle the acid water generated in the processes such as reforming, catalysis, coking, hydrogenation and gas separation in upstream processes. The acid water enters the acid water stripping device, and is converted into purified water after being heated by the reboiler to strip hydrogen sulfide. The purified water is sent to the sewage treatment system for further treatment and then discharged. The purified water after acid water stripping has a relatively high temperature. In order to recover this part of heat, a heat exchanger is arranged between the inlet and outlet pipelines of the acid water stripping device. Raw water (referring to acid water that has not been treated by the acid water stripping device) flows in the tube side of the heat exchanger, and the purified water flows in the tube side of the heat exchanger, so that the heat of the purified water is transferred to the raw water. The impurities such as coke powder and light oil contained in the raw water will accumulate on the heat exchanger to form dirt as the running time of the device increases. This part of dirt will cause the heat exchange effect to decrease, which leads to the decrease of the operation flexibility of the acid water stripping device, and easily causes the unqualified quality of the purified water, and the content of ammonia nitrogen and sulfide in the purified water exceeds the standard. At the same time, due to the decrease of the heat exchange efficiency of the heat exchanger, the heat extraction efficiency of the acid water feeding temperature decreases, so that the temperature of the acid water entering the tower cannot meet the index requirements. In order to ensure that the purified water meets the requirements for external delivery, the steam consumption of the reboiler at the bottom of the tower needs to be increased to ensure the stripping effect of the stripping tower. On the other hand, the acid water stripping device will reprocess the alkali sludge of the upstream device, which will quickly cause the dirt to form in the purified water passage of the heat exchanger, and also cause the heat exchanger to be blocked, thereby reducing the inlet and outlet balance of the acid water stripping device. Therefore, in order to maintain the normal operation of the acid water stripping device, it is necessary to stop the acid water stripping device and disassemble and clean the heat exchanger. The stoppage will shorten the operation cycle of the stripping process.
[0003] Therefore, how to simply remove the dirt on the heat exchanger and reduce or eliminate the downtime of the acid water stripping device has become a problem that needs to be solved by technical personnel. CONTENT OF THE UTILITY MODEL
[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an acid water heat exchange treatment system. A steam purging pipeline and a water flushing pipeline are arranged on the heat exchanger. The heat exchanger and the tube side that do not operate are cleaned by steam purging and water flushing, so as to avoid dirt accumulation. In addition, the two groups of heat exchangers are operated alternately to prevent the acid water stripping device from stopping.
[0005] In order to achieve the above-mentioned purpose, the utility model is realized by the following technical scheme.
[0006] The utility model provides a kind of sour water heat exchange treatment system, including heat exchanger group, steam purging pipeline and water flushing pipeline, the heat exchanger group includes multiple heat exchangers, the heat exchanger is close to the side of stripping column respectively connecting stripping column sour water pipeline and stripping column purified water pipeline;Heat exchanger is far from the side of stripping column respectively connecting sour water pump and purified water cooling device;
[0007] The heat exchanger is connected with the steam purging pipeline and the water flushing pipeline respectively.
[0008] The steam purging pipeline is connected with the steam system pipe network, and the water flushing pipeline is connected with the purified water pipe network.
[0009] Optionally, the heat exchanger group includes multiple heat exchanger subgroups connected in parallel with each other, and each heat exchanger subgroup includes multiple heat exchangers connected in series.
[0010] Optionally, the steam purging pipeline communicates with the tube pass of the heat exchanger, and the water flushing pipeline communicates with the tube pass of the heat exchanger.
[0011] Optionally, a valve is arranged on each branch of the steam purging pipeline connecting the heat exchangers.
[0012] Optionally, the steam purging pipeline communicates with the purified water pipe network.
[0013] Optionally, a three-stage settling tank is arranged between the sour water tank and the heat exchanger group.
[0014] Optionally, one end of the tube pass of the heat exchanger, which is far from the steam purging pipeline and the stripping column, communicates with the underground sour water tank.
[0015] Optionally, the other end of the tube pass of the heat exchanger, which is far from the sour water stripping device, is connected with the purified water cooling device.
[0016] Optionally, a valve is arranged on each branch of the sour water tank connecting the tube passes of the heat exchangers.
[0017] Optionally, the water flushing pipeline is connected to one end of the tube pass of the heat exchanger, which is far from the sour water stripping device.
[0018] Optionally, a valve is arranged on each branch of the water flushing pipeline connecting the tube passes of the heat exchangers.
[0019] The utility model has the following beneficial effects:
[0020] The utility model discloses a steam blowing pipeline is added at the pipe passage entrance of heat exchanger, can utilize high temperature steam to the dirt in the pipe passage is cleaned, thereby avoiding the problem of heat exchange efficiency reduction caused by the dirt in the pipe passage. After steam blowing is finished, can further flush the pipe passage through the flushing water pump, and the dirt that falls off is flushed out of the heat exchanger, and the flushing water containing the dirt that falls off is collected in the sour water tank, and is handled with raw material water again. Increase water flushing pipeline in the pipe passage of heat exchanger, and the water flushing pipeline can flush the scale in the pipe passage, and the flushing direction is same with the flow direction of routine purification water, to remove alkali residue scale and flow into the underground sour water tank and collect. Through the cleaning of the pipe passage and the pipe passage of heat exchanger respectively, the guarantee of heat exchange efficiency of heat exchanger is realized. Meanwhile, set up multiple heat exchanger groups, and multiple heat exchanger groups alternate and cut out and blow and clean, do not need to stop work, make the operation cycle of stripping process be extended. BRIEF DESCRIPTION OF DRAWINGS
[0021] The drawings accompanying the specification of this utility model form a part of the disclosure, serve to further provide an understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof serve to explain the utility model, and do not constitute improper limitation on the utility model.
[0022] In the drawing: the mutual distance or size is exaggerated for showing the position of each part, and the schematic diagram is only used for illustration.
[0023] Figure 1 It is the structure schematic diagram of the sour water heat exchange treatment system of the utility model.
[0024] Among them, 1, first heat exchanger group;2, second heat exchanger group;31, stripping tower sour water pipeline;32, stripping tower purification water pipeline;4, sour water pump;5, purification water cooling device;6, underground sour water tank;7, purification water pipe network;8, steam system pipe network;9, heat exchanger;10, three-stage sedimentation tank;11, first valve;12, second valve;13, third valve;14, fourth valve;15, fifth valve;16, sixth valve;17, seventh valve;18, eighth valve;19, ninth valve;20, tenth valve;21, eleventh valve;22, twelfth valve;23, thirteenth valve;24, fourteenth valve;25, fifteenth valve;26, sixteenth valve;27, seventeenth valve;28, eighteenth valve;29, nineteenth valve. DETAILED DESCRIPTION
[0025] The utility model will be further described below in connection with the drawings and embodiments.
[0026] A sour water heat exchange treatment system, such as Figure 1As shown, including the heat exchanger group steam purging pipeline and water flushing pipeline, heat exchanger group respectively including a plurality of heat exchanger 9, heat exchanger 9 near the side of stripping tower respectively connected stripping tower acid water pipeline 31 and stripping tower purified water pipeline 32; heat exchanger 9 away from the side of stripping tower respectively connected acid water pump 4 and purified water cooling device 5;
[0027] Heat exchanger 9 is connected with steam purging pipeline and water flushing pipeline respectively;
[0028] Steam purging pipeline connects steam system pipe network 8, which is 1.0 MPa steam system pipe network built in chemical plant, and water flushing pipeline connects purified water pipe network 7, which is purified water pipe network in chemical plant.
[0029] Steam purging pipeline and water flushing pipeline respectively use steam and water to purge and flush heat exchanger 9, which can clean the accumulated dirt in heat exchanger 9 and ensure the heat exchange efficiency of heat exchanger 9. Since multiple heat exchangers 9 are provided, a part of the number of heat exchangers 9 can be cut out for cleaning dirt during system operation, and other heat exchangers 9 are still used to supply raw water to the stripping tower acid water pipeline 31 of the acid water stripping device, thereby prolonging the operation cycle of the acid water stripping process.
[0030] The heat exchanger group includes first heat exchanger subgroup 1 and second heat exchanger subgroup 2 connected in parallel, and each heat exchanger subgroup includes a plurality of heat exchangers 9 connected in series. The plurality of heat exchangers 9 connected in series can improve the heat exchange effect of the heat exchanger subgroup and ensure that the temperature of the acid water after heat exchange is maintained above 90℃. The plurality of heat exchanger subgroups connected in parallel can cut out a part of the heat exchangers 9 from the "heat exchanger-stripping tower" operation system for cleaning, and the heat exchangers 9 not cut out continue to supply raw water to the stripping tower acid water pipeline 31 (i.e. the raw water pumped by the acid water pump 4).
[0031] The steam purging pipeline is connected to the tube side of the heat exchanger 9 through the heat exchanger inlet main pipeline, and the dirt accumulated by the impurities such as coke powder and light oil is softened / melted by the high temperature of the steam. The water flushing pipeline is connected to the tube side of the heat exchanger 9 through the heat exchanger vent valve, and the alkali residue scaling in the tube side is cleaned by the flushing force of water.
[0032] Valves are respectively arranged on the branches of the steam purging pipeline connecting each heat exchanger 9, which are used to prevent steam from mixing into the heat exchangers not cut out when cleaning the cut-out heat exchangers, so as to avoid gas entering the stripping device.
[0033] The steam purging pipeline is connected to the purified water pipe network 7, which is the purified water pipe network in the device. After the steam purging is completed, the tube side of the heat exchanger 9 can be further flushed with water. During the flushing process, the dirt falling off is collected by the flushing water and discharged from the tube side of the heat exchanger 9.
[0034] A three-stage settling tank 10 is arranged between the acid water pump 4 and the heat exchanger group.
[0035] The tube side of the heat exchanger 9 is connected to the underground sour water tank 6 at the end away from the steam blowing line and the stripping tower, and the line is the dirt discharge line. The sour water tank 6 is connected to the sour water pump 4, so that the dirt cleaned by blowing is re-entered into the sour water treatment process and further collected in the three-stage settling tank 10.
[0036] Valves are arranged on the branches of the tube side of each heat exchanger 9 to which the sour water pump 4 is connected, for preventing the raw water in the heat exchanger 9 from leaking to the dirt discharge line, which normally supplies raw water to the stripping tower sour water line 31 of the sour water stripping device.
[0037] The tube side of the heat exchanger 9 is connected to the purified water cooling device 5 at the end away from the stripping tower purified water line 32.
[0038] The water flushing line is connected to the tube side of the heat exchanger 9 at the end away from the stripping tower sour water line 31. During flushing of the tube side of the heat exchanger 9, the flushing direction is the same as the flow direction of the purified water in the normal heat exchange process, which is more conducive to cleaning of the alkali residue scale. Since the plurality of heat exchangers 9 are respectively connected to the purified water cooling device 5, the cleaned alkali residue scale can be discharged from the purified water line, and the flushing water is collected in the underground sour water tank.
[0039] Valves are arranged on the branches of the tube side of each heat exchanger 9 to which the water flushing line is connected, for preventing the water used for flushing the tube side from mixing with the purified water used for heat exchange.
[0040] When the heat exchange system of the heat exchanger-stripping tower in the system is normally operated, the first heat exchanger group 1 and the second heat exchanger group 2 are simultaneously used, and the valves connecting the inlets and outlets of the heat exchanger groups are closed, so that the raw water flowing out of the sour water tank passes through the second heat exchanger group 2 and the first heat exchanger group 1 in sequence and enters the stripping tower sour water line 31, and the purified water flowing out of the stripping tower purified water line 32 passes through the first heat exchanger group 1 and the second heat exchanger group 2 in sequence and is discharged to the purified water cooling device 5, at this time, the burden of each heat exchanger is smaller.
[0041] When the second heat exchanger group 2 needs to be cut out for cleaning, the third valve 13, the twelfth valve 22 and the seventh valve 17 are opened, the first valve 11, the second valve 12, the sixth valve 16 and the ninth valve 19 are closed, the fourth valve 14, the eighth valve 18 and the nineteenth valve 29 are opened, the tube passage of the second heat exchanger group 2 is cut out from the operation system of the "heat exchanger-gas stripping device", the raw water flowing out of the sour water pump 4 enters the stripping tower sour water pipeline 31 through the first heat exchanger group 1, and the purified water flowing out of the stripping tower purified water pipeline 32 is discharged to the purified water cooling device 5 through the first heat exchanger group 1, the heat exchange load of the plurality of heat exchangers is higher than that when the two heat exchanger groups are simultaneously enabled, but the normal operation of the system can still be ensured; at the same time, the fourth valve 14 and the eighth valve 18 are opened, so that the steam blowing pipeline can input blowing steam into the heat exchanger 9 in the second heat exchanger group 2, and the blowing steam can be discharged from the second heat exchanger group 2 along the eighth valve 18, after the steam blowing is completed, the flushing water pump is opened, the cleaning medium in the tube passage of the heat exchanger 9 in the second heat exchanger group 2 is changed from steam to water, so that the detached dirt is collected and discharged to the underground sour water tank 6, and the dirt can be further treated during the sedimentation process.
[0042] When the first heat exchanger group 1 needs to be cut out for cleaning, the fourth valve 14 and the eighth valve 18 are closed, the first valve 11, the second valve 12, the sixth valve 16, the ninth valve 19, the eleventh valve 21 and the fourteenth valve 24 are opened, the twelfth valve 22, the fifteenth valve 25, the tenth valve 20 and the sixteenth valve 26 are closed, the third valve 13 and the seventh valve 17 are closed, the tube passage of the first heat exchanger group 1 is cut out from the operation system of the "heat exchanger-gas stripping device", and the tube layer of the second heat exchanger group 2 functions in the state of the operation system of the "heat exchanger-gas stripping device"; the steam blowing pipeline can input blowing steam into the heat exchanger 9 in the first heat exchanger group 1 through the opened fifth valve 15 and the eighteenth valve 28, and the blowing steam can be discharged from the first heat exchanger group 1 along the seventeenth valve 27, after the steam blowing is completed, the flushing water pump is opened, the thirteenth valve 23 is opened, the flushing water is input into the heat exchanger 9 in the first heat exchanger group 1, and the flushed water flows into the purified water cooling device 5 for further treatment after being combined with the purified water flowing out of the second heat exchanger group 2 from the seventeenth valve 27.
[0043] Before the steam blowing pipeline and the water flushing pipeline are added, the steam consumption of the stripping unit is designed to be 0.146t / t, the sour water stripping processing capacity is 80 tons / hour after the heat exchange effect decreases, the steam consumption increases to 13 tons / hour, the consumption index is 0.162t / t, which exceeds the design steam consumption index, causing a substantial increase in energy consumption and an increase in operating cost.
[0044] After the steam purging pipeline and water flushing pipeline are added, two groups of raw water purification water heat exchangers are alternately cut out, the purging time is ensured to be 36-48 hours, the phenomenon of rising steam energy consumption caused by the decline of heat exchange effect is avoided, the operation cycle of the sour water stripping device is prolonged from 9 months to more than 36 months, the long-period operation target of three years of overhaul is met; according to the calculation of the verified data of the treated effect, the steam consumption is reduced from 0.162 t / t to 0.136 t / t, the steam consumption is reduced by 0.026 t / t, and according to the processing load of 80 t / h, 2.08 tons of steam can be saved per hour, and about 3.22 million yuan of steam consumption cost can be saved per year.
[0045] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An acid water heat exchange treatment system, characterized by, The heat exchanger group comprises a plurality of heat exchangers, and the heat exchangers are connected with the sour water stripping device and the sour water tank respectively; The heat exchanger is connected with the steam blowing pipeline and the water flushing pipeline respectively; The steam blowing pipeline is connected with the steam system pipeline network, and the water flushing pipeline is connected with the purified water pipeline network.
2. The sour water heat exchange treatment system of claim 1, wherein, The heat exchanger group comprises a plurality of heat exchanger subgroups connected in parallel with each other, and each heat exchanger subgroup comprises a plurality of heat exchangers connected in series.
3. The sour water heat exchange treatment system of claim 1, wherein, The steam blowing pipeline is connected with the tube side of the heat exchanger, and the water flushing pipeline is connected with the tube side of the heat exchanger.
4. The sour water heat exchange treatment system of claim 1, wherein, Valves are arranged on the branches of the steam blowing pipeline connected with the heat exchangers respectively.
5. The sour water heat exchange treatment system of claim 1, wherein, The steam blowing pipeline is connected with the purified water pipeline network.
6. The sour water heat exchange treatment system of claim 1, wherein, A three-stage settling tank is arranged between the sour water tank and the heat exchanger group.
7. The sour water heat exchange treatment system as claimed in claim 3, wherein The tube side of the heat exchanger is connected with the underground sour water tank away from the steam blowing pipeline and the stripping tower.
8. The sour water heat exchange treatment system as claimed in claim 7, wherein Valves are arranged on the branches of the sour water tank connected with the tube sides of the heat exchangers respectively.
9. The sour water heat exchange treatment system of claim 1, wherein, The water flushing pipeline is connected with the tube side of the heat exchanger away from the sour water pipeline of the stripping tower.
10. The sour water heat exchange treatment system of claim 9, wherein, Valves are arranged on the branches of the water flushing pipeline connected with the tube sides of the heat exchangers respectively.