CN217398633U - Device for treating waste alkali liquor by wet oxidation method - Google Patents

Abstract

The utility model discloses a device of waste lye is handled to wet-type oxidation method, including pre-heater, reactor and air compressor machine, the import and the export of reactor are respectively through pipeline intercommunication pre-heater, and the pre-heater passes through pipeline intercommunication booster pump, and the booster pump passes through pipeline intercommunication basket filter, and basket filter passes through pipeline intercommunication waste lye storage tank, and the air compressor machine passes through pipeline intercommunication gas holder, and the gas holder passes through pipeline intercommunication reactor, and the feeding overline department of pre-heater is provided with steam heater, and the pre-heater passes through pipeline intercommunication cooler, and the cooler passes through pipeline intercommunication demineralized water system, and the cooler passes through pipeline intercommunication gas-liquid separation system. The utility model provides a device of waste lye is handled to wet-type oxidation method has not only reduced economic cost, and can long period even running, has higher economic benefits simultaneously, and each item index of waste water after handling accords with emission standard moreover, can directly discharge, has simplified the follow-up processing step.

Description

Device for treating waste alkali liquor by wet oxidation method

Technical Field

The utility model belongs to the technical field of the chemical industry, concretely relates to wet oxidation method handles device of waste lye.

Background

When natural gas desulfurization, sulfur injection in oil refining chemical process conversion and desulfurization alkali liquor washing of various fractions of oil refining in the petroleum and natural gas industry are carried out, partial waste alkali liquor can be directly or indirectly generated, the waste alkali liquor contains sulfides and organic pollutants, if the waste alkali liquor is directly discharged, environmental water pollution can be caused, the new requirements of a safe and environment-friendly development new idea cannot be met, and therefore the waste alkali liquor needs to be subjected to oxidation treatment before being discharged.

At present, the oxidation reaction mechanism of the domestic and foreign waste alkali is basically mature and reliable, and the wet air oxidation treatment of the waste alkali liquor has been applied for years. The Zimpro process is the most mature and widely applied, but the Zimpro process requires high-temperature and high-pressure operation conditions, so that the material of the reactor is required to be high, the construction cost is high, and the popularization is influenced. Although the NEC process flow is simplified and the investment is saved, the NEC process only oxidizes sulfides and cannot effectively remove organic pollutants, so that the wastewater needs to be treated before being discharged, and the operation is complicated. In the domestic development process, due to the phenomenon of uneven engineering design, operation parameter design, continuous operation on site and the like, a device for treating the waste alkali liquor by a wet oxidation method is needed to be designed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a device for treating waste lye by a wet oxidation method.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a device of waste lye is handled to wet-type oxidation method, includes preheater, reactor and air compressor machine, the import and the export of reactor are respectively through pipeline intercommunication preheater, the preheater passes through pipeline intercommunication booster pump, the booster pump passes through pipeline intercommunication basket filter, basket filter passes through pipeline intercommunication waste lye storage tank, the air compressor machine passes through pipeline intercommunication gas holder, the gas holder passes through pipeline intercommunication reactor, the feeding overline department of preheater is provided with steam heater, the preheater passes through pipeline intercommunication cooler, the cooler passes through pipeline intercommunication demineralized water system, the cooler passes through pipeline intercommunication gas-liquid separation system.

Preferably, the gas-liquid separation system comprises a gas-liquid separator and an emptying tank, the gas-liquid separator is communicated with the cooler through a pipeline, the emptying tank is connected with a top outlet of the gas-liquid separator through a pipeline, a bottom outlet of the gas-liquid separator is communicated with a neutralization liquid tank through a pipeline, a top outlet of the neutralization liquid tank is communicated with a drainage pipeline, a bottom outlet of the neutralization liquid tank is connected with a reflux pump through a pipeline, a PH analyzer is arranged on the pipeline between the reflux pump and the neutralization liquid tank, and a water outlet of the reflux pump is communicated with the drainage pipeline through a pipeline.

Preferably, a pressure control valve is arranged on a connecting pipeline of the gas-liquid separator and the emptying tank, and a liquid level control valve is arranged on a bottom outlet pipeline of the gas-liquid separator.

Preferably, the demineralized water system comprises a demineralized water storage tank, a filter, a heat exchanger and a water pump, wherein the demineralized water storage tank is communicated with the filter and the heat exchanger through pipelines respectively, the filter is communicated with the water pump through a pipeline, and the water pump and the heat exchanger are communicated with the cooler through pipelines respectively.

Preferably, the preheater comprises a plurality of U-shaped bent pipe heat exchangers and a plurality of straight pipe heat exchangers, and the plurality of U-shaped bent pipe heat exchangers and the plurality of straight pipe heat exchangers are sequentially and alternately connected in series through flanges.

Preferably, the reactor contains reactor upper cover, reactor low head, reactor barrel, overhauls flange, two maintenance hand holes and multilayer distributor, the both ends opening of reactor barrel, reactor low head and reactor upper cover communicate respectively to set up in the bottom and the top of reactor barrel, and reactor low head and reactor upper cover all can dismantle with the reactor barrel through overhauing the flange and be connected, and two maintenance hand holes are seted up respectively in the bottom of the lateral surface of reactor barrel and reactor low head, and multilayer distributor sets up in the inside of reactor barrel, and the intercommunication is provided with material import pipe on the reactor low head.

Preferably, the pipe diameter of the reactor barrel is DN400, the pipe diameter of the material inlet pipe is DN40, and the wall thickness of the reactor barrel is 20 mm.

Preferably, the material of the reactor is 316 Ti.

Compared with the prior art, the utility model, its beneficial effect lies in:

(1) the utility model provides a device for processing waste lye of wet oxidation process passes through the special position design of preheater 1, has avoided waste lye and air mixture to take place oxidation reaction in advance and generate sodium sulfite or other products (such as simple substance sulphur) of not fully reacting in preheater 1 tube side effectively, cause the problem that 15 corrodes, wearing and tearing and raw materials phase flow disorder appear, simultaneously through increasing a steam heater 8 in preheater 1 feeding overline department for heat waste lye to the required temperature of reaction when starting, can effectively control the rate of rise of temperature of reactor; meanwhile, the risk of mutual channeling of the reuse steam and the waste alkali liquor of the pipe network can be effectively avoided. Meanwhile, through the design of the steam heater 8, the outlet temperature of the preheater 1 can be controlled to be about 150 ℃, the reaction temperature is further controlled to be 210-230 ℃, and the phenomenon that a large amount of sodium sulfide is separated out when the temperature of the waste alkali liquor exceeds 240 ℃, so that the pipeline is crystallized and blocked and overpressure is caused can be effectively avoided;

(2) the utility model has the advantages that the multilayer distributor is arranged in the reactor and the diameter is enlarged, so that the air and the waste alkali liquor are subjected to micro uniform distribution by the distributor, the contact probability of the two materials is greatly increased, the reaction is promoted to approach to a target product, and the reaction efficiency is increased; secondly, along with the increase of reaction products, the redistribution of the second time and the third time is needed to increase the contact probability of the two materials again, thereby avoiding the phenomena of blockage caused by the precipitation of crystals and over-reaction at local parts, sulfur simple substance generation and the like, increasing the contact probability of the two materials, improving the effective rate of unit treatment, reducing the initial reaction temperature, widening the range of the treatment raw materials, strengthening the operability of applicability, ensuring that the continuity of the superposed temperature generated by the reaction is more reliable and the probability of reaction termination is nearly zero due to the reduction of the initial reaction temperature and the increase of the distributivity of the two reaction materials, further changing the reaction pressure from the original secondary high pressure to the medium pressure, reducing the maintenance risk of a pressure vessel and greatly reducing the operation difficulty of the pressure vessel, and further adopting the common type as the main material of the reactor, the one-time investment cost for unit construction is greatly reduced, and the steam medium with higher selective price ratio can be heated in the start-up process;

(3) the utility model adopts the design of the demineralized water system, adopts the demineralized water as the cooling medium and is matched with the addition of the temperature control valve, thereby reducing the blocking probability of unit scaling and salting out and realizing the safe, stable and long-period operation mode;

(4) the device for treating the waste alkali liquor by the wet oxidation method provided by the utility model has the advantages that the device can be conveniently maintained and the later maintenance cost control is reduced by the special design that the three-section type reactor and the flange are adopted to connect the plurality of U-shaped bent pipe heat exchangers and the plurality of straight pipe clamping heat exchangers;

(5) the utility model ensures that the corrosion probability of elements such as unit equipment, pipelines, instruments and the like is nearly zero, and reduces the operation cost of dilution and blending because the range for treating the waste alkali liquor is widened;

(6) the utility model provides a high salt waste water after the device is handled completely satisfies new standard yellow river basin sewage integrated emission standard (DB 61/224-2018) of Shanxi province, has reduced personnel's input, energy consumption cost and emergency state of downstream processing workshop section sewage treatment unit (flood prevention and all the other devices discharge more unusually), the emergent risk of safety that the liquid level is too high etc.; and the sulfur content of the high-salinity wastewater is nearly zero, the COD value is controlled below 50ppm, the PH value is 7-9, no ammonia nitrogen exists, and the high-salinity wastewater can be directly connected into a zero-emission sulfate crystallization unit, so that the pretreatment steps are reduced.

Drawings

FIG. 1 is a schematic structural diagram of an apparatus for treating waste lye by a wet oxidation method according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing the structure of a prior art apparatus for treating spent lye by a wet oxidation process;

fig. 3 is a schematic structural diagram of a preheater in an embodiment of the present invention;

FIG. 4 is a schematic diagram of a preheater in a prior art apparatus;

FIG. 5 is a schematic view of the structure of a reactor in an example of the present invention;

FIG. 6 is a schematic view showing the structure of a reactor in a conventional apparatus;

FIG. 7 is a schematic view of a structure of a neutralization liquid tank in a prior art device;

in the figure: 1. a preheater; 2. a reactor; 3. an air compressor; 4. a booster pump; 5. a basket filter; 6. a waste alkali liquor storage tank; 7. a gas storage tank; 8. a steam heater; 9. a cooler; 10. a gas-liquid separator; 11. an upper end enclosure of the reactor; 12. a neutralization liquid tank; 13. a desalted water storage tank; 14. a filter; 15. a heat exchanger; 16. a water pump; 17. a U-shaped bent pipe heat exchanger; 18. a straight pipe clamping heat exchanger; 19. a reactor lower end enclosure; 20. a reactor barrel; 21. overhauling the flange; 22. hand holes are overhauled; 23. a multi-layer distributor; 25. a reflux pump; 26. a stirrer; 27. an analytical instrument.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As shown in fig. 1, the embodiment of the utility model provides a device of waste lye is handled to wet oxidation method, including pre-heater 1, reactor 2 and air compressor machine 3, the import and the export of reactor 2 are respectively through pipeline intercommunication pre-heater 1, pre-heater 1 is through pipeline intercommunication booster pump 4, booster pump 4 is through pipeline intercommunication basket filter 5, basket filter 5 is through pipeline intercommunication waste lye storage tank 6, air compressor machine 3 is through pipeline intercommunication gas holder 7, gas holder 7 is through pipeline intercommunication reactor 2, pre-heater 1's feeding overline department is provided with steam heater 8, pre-heater 1 is through pipeline intercommunication cooler 9, cooler 9 is through pipeline intercommunication demineralized water system, cooler 9 is through pipeline intercommunication gas-liquid separation system.

FIG. 2 is a diagram of an apparatus for treating waste lye by wet oxidation method, which was developed and used by the company before, and the apparatus has the disadvantages that the reactor 2, the preheater 1, the neutralization liquid tank 12, part of pipelines and part of valves are seriously corroded, the running, the leakage and the dripping are frequent, the apparatus cannot be used normally, and the long-period stable operation of treating the waste lye by wet oxidation method is seriously influenced. Therefore, based on the technical problem that the device of wet oxidation process treatment lye of previous exists, improve, obtain the utility model discloses the device of wet oxidation process treatment lye of going into the lye of going into the lye of the material of going into before through mixing with the compressed air of the material of inflow and before changing into the material preheater 1 of the material (directly into the reactor 2 of reactor, effectively, the lye of going into in advance of lye of going into in advance, the lye of going into in advance of lye of the lye of going into, the lye of going into, the lye of the lye of going into, the lye of the ash of the lye of going into, the lye of going into, the lye of the ash of the. Meanwhile, the embodiment of the utility model is additionally provided with a steam heater 8 at the feeding cross line of the preheater 1 for heating the waste alkali liquor to the temperature required by the reaction during the starting, so that the heating rate of the reactor can be effectively controlled; meanwhile, the risk of mutual channeling of the reuse steam and the waste alkali liquor of the pipe network can be effectively avoided. Simultaneously through steam heater 8's design, can make preheater 1 outlet temperature control about 150 ℃, and then control reaction temperature be 210 ~ 230 ℃, can effectively avoid waste alkali lye to separate out a large amount of sodium sulfide when exceeding 240 ℃, cause the pipeline crystallization to block up, arouse the phenomenon of superpressure, just through the utility model discloses the product COD of the device processing that the embodiment provided is stable below 50ppm, and the sulphide is nearly zero, and the water quality index can reach new standard yellow river basin sewage integrated emission standard of shaanxi province (DB 61/224-2018). Because the alkali metal hydroxide oxidation unit is great because of the medium fluctuation, the embodiment of the utility model provides a through being equipped with the pH value analysis appearance at vapour and liquid separator outlet line, can monitor reactor reaction product and change in real time, have the decline trend in time to adjust new alkali metal hydroxide ratio if pH value to can keep the reaction product all the time and can directly discharge. FIG. 7 is a structural diagram of a neutralization liquid tank in a device for treating waste lye by a wet oxidation method, which is used by the company in the previous research and development, compared with the structure of the neutralization liquid tank in the previous, the embodiment of the present invention changes the reaction product neutralization liquid tank 12 from the original ordinary carbon steel material into a 904L material which is more corrosion resistant under the unqualified pH condition, removes the stirrer 26 on the top of the tank, adds a reflux pump 25 on the outlet pipeline at the bottom of the tank, and can give consideration to outward delivery while stirring, thereby greatly improving the problem of difficult pressure delivery caused by poor sealing effect of the stirrer, and after adding the pump, moves the original analytical instrument 27 arranged in the tank into a circulation loop, thereby greatly improving the accuracy of the on-line analytical instrument, meanwhile, the embodiment of the present invention changes the circulating water of the shell pass of the reaction product cooler into demineralized water, and increases the demineralized water cooling of the demineralized water system through circulating demineralized water, the problem that the long-period operation of the device is seriously influenced by the shell pass scaling of the original circulating water can be effectively solved.

The gas-liquid separation system comprises a gas-liquid separator 10 and an emptying tank, wherein the gas-liquid separator 10 is communicated with a cooler 9 through a pipeline, the emptying tank is communicated with a top outlet of the gas-liquid separator 10 through a pipeline, a bottom outlet of the gas-liquid separator 10 is communicated with a neutralization liquid tank 12 through a pipeline, a top outlet of the neutralization liquid tank 12 is communicated with a drainage pipeline, a bottom outlet of the neutralization liquid tank 12 is connected with a reflux pump 25 through a pipeline, a PH analyzer is arranged on the pipeline between the reflux pump 25 and the neutralization liquid tank 12, and a water outlet of the reflux pump 25 is communicated with the drainage pipeline through a pipeline. The medium inlet temperature of the gas-liquid separator 10 is adjusted and controlled by a temperature control regulating valve for circulating demineralized water, so that the probability of salting-out blockage can be greatly reduced.

A pressure control valve is arranged on a connecting pipeline of the gas-liquid separator 10 and the emptying tank, and a liquid level control valve is arranged on an outlet pipeline at the bottom of the gas-liquid separator 10.

The demineralized water system comprises a demineralized water storage tank 13, a filter 14, a heat exchanger 15 and a water pump 16, wherein the demineralized water storage tank 13 is respectively communicated with the filter 14 and the heat exchanger 15 through pipelines, the filter 14 is communicated with the water pump 16 through a pipeline, and the water pump 16 and the heat exchanger 15 are respectively communicated with the cooler 9 through pipelines.

As shown in fig. 3, the preheater 1 includes a plurality of U-shaped bent pipe heat exchangers 17 and a plurality of straight pipe heat exchangers 18, and the plurality of U-shaped bent pipe heat exchangers 17 and the plurality of straight pipe heat exchangers 18 are sequentially and alternately connected in series via flanges, respectively. Fig. 4 is the structure chart of the pre-heater in the wet oxidation method of this company's prior research and development use handles the device of waste lye, compare with the structure of pre-heater before, the embodiment of the utility model discloses change into 21 groups through pressing from both sides integral type cover U type pipe pre-heater and pass through flange joint with U type return bend heat exchanger 17 and clamp straight tube heat exchanger 18 detachable, can dismantle into the nipple joint when overhauing and look for the hourglass, solved pre-heater 1 inner tube effectively and blockked up with the leakage after, look for, the difficult problem of leaking stoppage and mediation difficulty, greatly made things convenient for and overhauld and dredge, improved maintenance efficiency.

As shown in fig. 5, the reactor 2 comprises a reactor upper head 11, a reactor lower head 19, a reactor barrel 20, a maintenance flange 21, two maintenance hand holes 22 and a multi-layer distributor 23, both ends of the reactor barrel 20 are open, the reactor lower end socket 19 and the reactor upper end socket 11 are respectively communicated and arranged at the bottom and the top of a reactor cylinder 20, the reactor lower end socket 19 and the reactor upper end socket 11 are respectively detachably connected with the reactor cylinder 20 through an overhauling flange 21, two overhauling hand holes 22 are respectively arranged at the bottoms of the outer side surfaces of the reactor cylinder 20 and the reactor lower end socket 19, a multilayer distributor 23 is arranged inside the reactor cylinder 20, the distributor 23 mainly comprises three groups of dispersion discs and three vertical connecting rods, the three groups of dispersion discs are arranged in parallel up and down, the three connecting rods are uniformly welded at intervals at the outer edge of an annular plate of each group of dispersion discs along the circumferential direction, and the three dispersion discs are connected in series; the bottom of the group of dispersion discs positioned at the lowest is provided with a support ring plate, the peripheral surface of the support ring plate is welded with the inner side wall of the reactor cylinder 20, and the top of the connecting rod is provided with three radial fastening bolts which can be installed with the reactor cylinder 20 and are used for limiting the degree of freedom of the distributor 23 along the axial direction.

A material inlet pipe N4 is communicated with the lower reactor head 19, a treatment liquid outlet N2 is arranged at the top of the upper reactor head 11, a thermometer port T1 and a reactor pressure port N1 are arranged on the side wall of the upper reactor head 11, a bottom drain outlet N3 is arranged at the bottom of the lower reactor head 19, and a thermometer port T2 is arranged on the side wall of the lower reactor head 19. The pipe diameter of the reactor cylinder 20 is DN400, the pipe diameter of the material inlet pipe N4 is DN40, and the wall thickness of the reactor cylinder 20 is 20 mm. The material of the reactor 2 was 316 Ti. FIG. 6 is a structural diagram of a reactor in a device for treating waste lye by a wet oxidation method, which is developed and used by the present company before, compared with the structure of the existing reactor, the reactor 2 in the embodiment of the present invention can be conveniently dredged and quickly restored to operate after the reactor barrel 20 is blocked by providing a detachable flange and a manhole at the bottom of the reactor barrel 20, and meanwhile, because there is no distributor inside the existing reactor 2, the contact probability of air and waste lye is low, there is a problem of insufficient reaction at local parts, and the reaction efficiency is low, the embodiment of the present invention increases the diameter of the reactor barrel 20 from DN350 to DN400, and embeds a three-layer distributor 23, the pipe diameter of a material inlet pipe N4 is expanded from original DN25 to DN40, thereby reducing the flow rate of reaction feed and increasing the residence time of the reaction feed in the reactor 2, the air and the waste alkali liquor are subjected to micro-uniform distribution by the distributor 23, so that the contact probability of the two materials is greatly increased, the approach of the reaction to a target product is promoted, the reaction efficiency is increased, and the purpose of full reaction is achieved; secondly, along with the increase of reaction products, second and third redistribution is needed to increase the contact probability of the two materials again, so that the phenomena of blockage caused by precipitation of crystals and over-reaction of parts to generate sulfur simple substances and the like can be avoided, and meanwhile, the reaction efficiency is improved, so that the initial reaction temperature is reduced and the method becomes very feasible; because the continuity and the superposition of the reaction temperature are enhanced, the possibility of the reaction termination is almost zero, a certain amount of waste alkali liquor is treated, the highest reaction temperature is necessarily reduced on the premise that the absolute temperature rise is relatively certain, the reaction pressure is changed from the original secondary high pressure to the medium pressure, the maintenance risk of a pressure container is reduced, the operation difficulty of the pressure container is greatly reduced, a steam medium (3.5MPa) with higher selective price ratio is used as a heating source, the material of the main reactor 2 can be changed from the original Hastelloy C276 to 316Ti due to the reduction of the reaction pressure, the material of a pipeline and an instrument is also approximately reduced to a common material, and the one-time investment cost of unit construction is greatly reduced; in addition, the wall thickness of the reactor cylinder 20 is increased from the original 10mm to 20mm, so that the allowance of acid and alkali corrosion resistance of the reactor can be larger.

The embodiment of the utility model provides a parameter pair that device and this company used before the wet oxidation method that wet oxidation method handled waste lye was used to the device of waste lye is shown as following table 1.

Table 1 optimization parameter schedule

Can see through the result of table 1, the utility model provides a device compares with current device, and the heating temperature of beginning to work, reaction inlet temperature, reaction outlet temperature and reactor pressure have all had very big decline, have reduced the energy consumption promptly, and each part of device can adopt ordinary material moreover, has reduced construction cost, just the utility model provides a waste water sulfur content after the device is handled is nearly zero, and COD value control is below 50ppm, and pH value 7-9 does not have the ammonia nitrogen, can satisfy emission standard, can directly arrange into the sulfate crystal unit of zero release, reduces the preliminary treatment step, has reduced under the personnel's that the low reaches was handled sewage treatment unit input, energy consumption cost and the emergency state (flood prevention and all the other devices discharge the more safe emergency risk etc. of workshop section unusually) liquid level.

Table 2 is a comparison of the economic benefit of the apparatus for treating waste lye by wet oxidation method provided by the embodiment of the present invention and the apparatus for treating waste lye by wet oxidation method used in the research and development of the present company before, as shown in table 2 below.

TABLE 2 comparison table of main economic benefits

Categories	Before technical improvement	After technical improvement	Value, quantity difference/t	Remarks to note
					Reactor materials	C276	316Ti	100 ten thousand per	120 ten thousand: 20 ten thousand
Heating medium	4.8MPa steam	3.5MPa steam	100 yuan/ton
					Consumption of nitric acid	0.6t/a	0.1t/a	0.5t/a	Unit price: 6000 yuan/t
Maintenance costs	120 ten thousand per year	24 ten thousand per year	96 ten thousand per year

Note: the maintenance cost is estimated according to the annual financial statement statistical data before and after the technical improvement.

As can be seen from the results in Table 2, the embodiment of the utility model provides a device compares with preceding device, and the reactor material is become 316Ti by C276, and the construction cost descends by a wide margin, and heating medium's cost, nitric acid consumption and examine the reduction of maintenance cost all by a wide margin, have obtained better economic benefits.

The embodiment of the utility model provides a theory of operation of wet oxidation method handles device of lye change, including following step:

s1, removing mechanical impurities from the raw material waste alkali liquor in the waste alkali liquor storage tank 6 through a basket filter 5, pressurizing to 3.5Mpa through a booster pump 4, entering a preheater 1, exchanging heat with a product through heat exchange and cross-line control of a steam heater 8, and exchanging heat to 150 ℃ to obtain preheated liquid;

s2, compressing the outside air by an air compressor 3 to obtain compressed air, mixing the compressed air and the preheated liquid obtained in the step S1 in a pipeline, then entering a reactor 2, and carrying out oxidation reaction in the reactor 2 to obtain a reactant flow;

s3, discharging the reactant flow obtained in the step S3 from an outlet at the top of the reactor 2, entering the preheater 1, exchanging heat with waste alkali liquor before reaction, reducing the temperature to 160-180 ℃, entering the cooler 9 through a pipeline to be cooled with desalted water, reducing the temperature to 30-40 ℃, entering the gas-liquid separator 10 through a pipeline to perform gas-liquid separation, discharging the gas phase into a blow-down tank after reducing the pressure of the gas-liquid separator 10 top outlet through a pressure control valve, discharging the gas phase into a boiler through a blow-down pipe at the top of the blow-down tank, and discharging the liquid phase out of the device after reducing the pressure of the liquid phase through a liquid level control valve at the bottom outlet of the gas-liquid separator 10.

The device for treating the waste alkali liquor by the wet oxidation method provided by the embodiment of the utility model can be applied to the chemical industry of an olefe mixed dehydrogenation device, can diffract the waste alkali liquor to the processes matched with the processes such as ethylene cracking, propane dehydrogenation and carbon dehydrogenation, can carry out different processing large-scale production according to the scale of device requirements, and can provide solid engineering design and implementation case guarantee of technical operation stability for large-scale refining investment construction in adjustment period of industrial structures such as nations, public enterprises and foreign enterprises; simultaneously, the embodiment of the utility model provides a process can also make up into the process technology package of joint treatment waste water with other high ammonia nitrogen waste water to be applicable to bigger waste water treatment engineering design scope, in addition, characteristics such as equipment material, power consumption medium selection and easy operation make this technological popularization become easier.

To sum up, the embodiment of the utility model provides a device of wet oxidation method processing waste lye has not only reduced economic cost, and can long period even running, has higher economic benefits simultaneously, and each item index of waste water after handling accords with emission standard moreover, can directly discharge, has simplified the follow-up processing step.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. A device for treating waste alkali liquor by a wet oxidation method is characterized by comprising a preheater (1), a reactor (2) and an air compressor (3), the inlet and the outlet of the reactor (2) are respectively communicated with the preheater (1) through pipelines, the preheater (1) is communicated with the booster pump (4) through pipelines, the booster pump (4) is communicated with the basket filter (5) through pipelines, the basket filter (5) is communicated with the waste lye storage tank (6) through pipelines, the air compressor (3) is communicated with the air storage tank (7) through pipelines, the air storage tank (7) is communicated with the reactor (2) through pipelines, a steam heater (8) is arranged at the feeding cross-line of the preheater (1), the preheater (1) is communicated with the cooler (9) through pipelines, the cooler (9) is communicated with a desalination water system through pipelines, and the cooler (9) is communicated with a gas-liquid separation system through pipelines.

2. The apparatus for treating waste lye of claim 1, wherein the gas-liquid separation system comprises a gas-liquid separator (10) and a blow-down tank, the gas-liquid separator (10) is connected with the cooler (9) through a pipeline, the blow-down tank is connected with the top outlet of the gas-liquid separator (10) through a pipeline, the bottom outlet of the gas-liquid separator (10) is connected with a neutralization liquid tank (12) through a pipeline, the top outlet of the neutralization liquid tank (12) is connected with a drainage pipeline, the bottom outlet of the neutralization liquid tank (12) is connected with a reflux pump (25) through a pipeline, a PH analyzer is arranged on the pipeline between the reflux pump (25) and the neutralization liquid tank (12), and the water outlet of the reflux pump (25) is connected with the drainage pipeline through a pipeline.

3. The apparatus for treating spent lye of claim 2 wherein the connecting pipeline of said gas-liquid separator (10) and the blow tank is provided with a pressure control valve and the bottom outlet pipeline of the gas-liquid separator (10) is provided with a level control valve.

4. The apparatus for treating spent lye of claim 1 wherein the demineralized water system comprises a demineralized water storage tank (13), a filter (14), a heat exchanger (15) and a water pump (16), wherein the demineralized water storage tank (13) is in communication with the filter (14) and the heat exchanger (15) through pipes, the filter (14) is in communication with the water pump (16) through pipes, and the water pump (16) and the heat exchanger (15) are in communication with the cooler (9) through pipes.

5. The apparatus for treating spent lye of claim 1 wherein the preheater (1) comprises a plurality of U-bend heat exchangers (17) and a plurality of sandwiched straight tube heat exchangers (18), the plurality of U-bend heat exchangers (17) and the plurality of sandwiched straight tube heat exchangers (18) being sequentially and alternately connected in series via flanges, respectively.

6. The device for treating waste alkali liquor by using the wet oxidation method as claimed in claim 1, wherein the reactor (2) comprises a reactor upper end enclosure (11), a reactor lower end enclosure (19), a reactor cylinder (20), an inspection flange (21), two inspection hand holes (22) and a multi-layer distributor (23), two ends of the reactor cylinder (20) are open, the reactor lower end enclosure (19) and the reactor upper end enclosure (11) are respectively communicated and arranged at the bottom and the top of the reactor cylinder (20), the reactor lower end enclosure (19) and the reactor upper end enclosure (11) are respectively detachably connected with the reactor cylinder (20) through the inspection flange (21), the two inspection hand holes (22) are respectively arranged at the bottoms of the outer side surfaces of the reactor cylinder (20) and the reactor lower end enclosure (19), the multi-layer distributor (23) is arranged inside the reactor cylinder (20), a material inlet pipe is communicated with the lower end enclosure (19) of the reactor.

7. The apparatus for treating spent lye of claim 6 wherein the pipe diameter of the reactor barrel (20) is DN400, the pipe diameter of the material inlet pipe is DN40 and the wall thickness of the reactor barrel (20) is 20 mm.

8. The apparatus for treating spent lye of claim 6 wherein the material of the reactor vessel (2) is 316 Ti.

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