Coal tar dehydration and desalination treatment system

Abstract

According to the coal tar dehydration and desalination treatment system provided by the utility model, saline water is added into impurity-removed coal tar subjected to centrifugal impurity removal, heating and stirring are carried out, demulsification operation of emulsified water is realized through heating and stirring, and the saline water and the impurity-removed coal tar are fully mixed, so that salt in the saline water enters the emulsified water; the density of the emulsified water is rapidly increased, the coal tar with the small density is located on the upper layer in the subsequent constant-temperature standing process, the emulsified water and the saline water with the large density sink to be located on the middle layer and the bottom layer, the layered upper layer is extracted, and the dehydrated and desalted coal tar can be obtained. According to the utility model, the salt density of the emulsified water is increased by using the saline water, and the emulsified water and the saline water sink and layer in the constant-temperature standing process, so that the dehydrated and desalted coal tar is obtained from the upper layer, and the technical problems of complicated operation, high energy consumption and high cost caused by the use of a large number of electric desalting and dehydrating devices in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to coal tar processing technical field, concretely relates to a coal tar dehydration and desalination treatment system. BACKGROUND

[0002] Coal tar is also called coal paste, coal distillate and coal tar solution, which is a chemical product obtained in the dry distillation and gasification process of coal, and has a wide range of applications and important value in many fields such as chemical industry, energy, transportation and construction.

[0003] In the production process of coal tar, a certain amount of water is often contained, and the water also contains salt. In the use process of coal tar, the water containing salt will produce steam, which will cause the pressure fluctuation of coal tar heating furnace, accelerate the aging of equipment and affect the service life of catalyst, etc., thereby bringing risks to the use of coal tar. Therefore, it is of great significance to carry out dehydration treatment on coal tar. However, the water in coal tar often exists in the form of emulsified water, and it is difficult to achieve complete dehydration and desalination by conventional means. Therefore, how to carry out dehydration and desalination treatment on coal tar is a problem concerned by those skilled in the art, and related technical solutions are disclosed in some patent documents.

[0004] For example, in the patent application file with the application number CN201710705421.8, a coal tar electric desalination and dehydration system and method are disclosed. In this patent, the first electric desalination and dehydration device and the second electric desalination and dehydration device are used to carry out dehydration and desalination treatment on coal tar, which to some extent solves the problem of dehydration of coal tar. However, due to the use of a large number of electric desalination and dehydration devices and demulsifiers, the operation is complex, the energy consumption is high, and the cost is high. UTILITY MODEL CONTENT

[0005] In order to solve the technical problems of complex operation, high energy consumption and high cost caused by the use of a large number of electric desalination and dehydration devices in the dehydration process of coal tar in the background art, the utility model provides a coal tar dehydration and desalination treatment system.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A coal tar dehydration and desalination treatment system, comprising: a centrifugal impurity removal assembly, a heating and stirring assembly, a salt water storage assembly, a constant temperature standing assembly, an extraction assembly and a coal tar storage assembly;

[0008] The centrifugal impurity removal assembly receives raw coal tar;

[0009] The salt water storage assembly stores salt water, and the salt water storage assembly is connected to the heating and stirring assembly;

[0010] The heating and stirring assembly is connected with the centrifugal impurity removal assembly and the constant-temperature standing assembly.

[0011] The extraction assembly is connected with the constant-temperature standing assembly and the coal tar storage assembly.

[0012] Optionally, the coal tar dehydration and desalination treatment system further comprises an impurity recovery assembly connected with the centrifugal impurity removal assembly.

[0013] Optionally, the coal tar storage assembly is connected with a boiling bed reaction raw material tank.

[0014] Optionally, the heating and stirring assembly is a steam stirrer further connected with a heat tracing steam pipe network.

[0015] Optionally, the coal tar dehydration and desalination treatment system further comprises a salt water extraction assembly connected with the constant-temperature standing assembly and a waste water treatment system.

[0016] Optionally, the salt water extraction assembly is further connected with the salt water storage assembly.

[0017] Optionally, the extraction assembly is further connected with the centrifugal impurity removal assembly.

[0018] Optionally, the constant-temperature standing assembly comprises a plurality of constant-temperature storage tanks, each of which comprises a tank body and a plurality of extraction ports arranged on the tank body.

[0019] The tank body is connected with the heating and stirring assembly.

[0020] The extraction ports are arranged on the tank body from top to bottom, and the extraction assembly is connected with the extraction ports.

[0021] Optionally, the tank body is further provided with a layered observation window and a plurality of sampling ports.

[0022] The sampling ports are arranged on the tank body from top to bottom.

[0023] Optionally, the salt water stored in the salt water storage assembly has a concentration of 20% to 30%.

[0024] The coal tar dehydration and desalination treatment system has the following beneficial effects:

[0025] (1) The utility model provides a coal tar dewatering and desalination treatment system, through centrifugal impurity removal subassembly to raw material coal tar centrifugal impurity removal, remove the mechanical impurities therein, add brine to the impurity removal coal tar after impurity removal, and heat stirring subassembly is carried out heating stirring, realize the demulsification operation of emulsified water through heating stirring, make brine and impurity removal coal tar fully mix, so that the salt in brine enters emulsified water, rapidly increase the density of emulsified water, and make the coal tar with smaller density be in upper layer in the process of subsequent constant temperature standing, and the emulsified water and brine with larger density sink and be in middle layer and bottom layer, through extraction component to the upper layer after stratification extraction and transport to coal tar storage component, can obtain the coal tar of dewatering and desalination. The coal tar dewatering and desalination treatment system provided in the utility model utilizes brine to make emulsified water obtain the effect that the density of salt increases, makes emulsified water and brine sink and stratify in the process of constant temperature standing, so that the coal tar of dewatering and desalination is obtained in upper layer, solve the technical problem of complex operation, high energy consumption and high cost caused by the large use of electric desalination and dewatering device in the prior art.

[0026] (2) Meanwhile, the coal tar dewatering and desalination treatment system in the utility model can also carry out backflow operation to the brine in bottom layer through brine extraction component, make the brine backflow to brine storage component, after adjusting the concentration to the required concentration, be used in heating stirring component again, carry out desalination and dewatering treatment to coal tar, improve the utilization rate, reduce the discharge of brine, and reduce the damage to the environment. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the schematic diagram of coal tar dewatering and desalination treatment system in the utility model,

[0028] Figure 2 It is the schematic diagram of constant temperature storage tank in the utility model.

[0029] Among them: 1, tank body, 2, extraction port, 3, stratification observation window, 4, sampling port. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment, obviously, the described embodiment is only a part of the utility model embodiment, not all the embodiment. The description of at least one exemplary embodiment is actually only illustrative, not as any limitation on the utility model and its application or use. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of the utility model protection.

[0031] It is to be understood that the terms so far as the language goes used in this specification are only to describe the specific implementation and are not intended to limit the exemplary embodiments according to the present application. As used in this specification, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprising" and / or "including", when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0032] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be clear that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The techniques, methods and devices known to those skilled in the related art can not be discussed in detail, but should be considered as part of the specification under appropriate circumstances. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so further discussion is not needed in subsequent drawings once an item is defined in one drawing.

[0033] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0034] For ease of description, spatial relative terms, such as "on", "above", "upper surface", "upper", and the like, can be used herein to describe the spatial relationship between one device or feature to another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, the device described as "above" or "on" the other device or structure would then be oriented "below" or "under" the other device or structure. Thus, the exemplary term "above" can include both the "above" and "below" orientations. The device can also be oriented in other different ways (rotated 90 degrees or at other orientations) and the spatial relative descriptions used herein interpreted accordingly.

[0035] In addition, it should be noted that the use of the terms "first", "second", and the like, to describe various components, is merely intended to differentiate one component from another, and does not imply a special order or sequence of use, unless otherwise stated, and therefore should not be interpreted to limit the scope of the present application.

[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0037] Coal tar is a chemical product obtained in the dry distillation and gasification process of coal. Due to the production raw materials and process, the coal tar often contains water. The water in the coal tar includes free water and emulsified water. The free water is relatively easy to remove and can be basically removed in the production process of the coal tar. The removal of the free water also removes most of the salt in the coal tar. However, the emulsified water still contains a certain amount of salt, and because the emulsified water is a water-in-oil emulsion, it is difficult to completely remove. In the use process of the coal tar, the emulsified water containing salt will produce steam, thereby causing the pressure fluctuation of the coal tar heating furnace, accelerating the aging of the equipment, and affecting the service life of the catalyst, etc.

[0038] Referring to Figure 1 and Figure 2 , a coal tar dewatering and desalination treatment system described in the present application is shown, which comprises: a centrifugal impurity removal assembly, a heating and stirring assembly, a brine storage assembly, a constant-temperature standing assembly, a extraction assembly, and a coal tar storage assembly; the centrifugal impurity removal assembly receives raw coal tar; the brine storage assembly stores brine, and the brine storage assembly is communicated with the heating and stirring assembly; the heating and stirring assembly is communicated with the centrifugal impurity removal assembly and the constant-temperature standing assembly; the extraction assembly is communicated with the constant-temperature standing assembly and the coal tar storage assembly.

[0039] In the embodiment, the produced raw coal tar is centrifugally removed impurities by the centrifugal impurity removal assembly, and the mechanical impurities contained in the raw coal tar are removed to obtain the impurity-removed coal tar, at this time, the impurity-removed coal tar still contains emulsified water; the impurity-removed coal tar is input into the heating and stirring assembly, salt water is added into the impurity-removed coal tar through the salt water storage assembly, and then heating and stirring are performed, so that the demulsification operation of the emulsified water is realized, the salt water, the impurity-removed coal tar and the emulsified water are fully mixed, the solubility of salt in the coal tar is much lower than that in water, the salt in the salt water enters the emulsified water at the same time, and the salt is prevented from mixing into the coal tar, so that the density of the emulsified water is rapidly increased; the salt water and the impurity-removed coal tar after heating and stirring are input into the constant-temperature standing assembly for constant-temperature standing, in the process of constant-temperature standing, the coal tar with smaller density rises to the upper layer, and the salt water and the emulsified water with larger density due to the absorption of salt gradually sink to the middle layer and the bottom layer; the upper layer after stratification is extracted by using the extraction assembly, and the coal tar after dehydration and desalination is obtained, and the coal tar after dehydration and desalination extracted is input into the coal tar storage assembly for subsequent use.

[0040] The coal tar dehydration and desalination treatment system provided in the utility model utilizes salt water to make the emulsified water obtain the effect of increasing the density of salt, and makes the emulsified water and the salt water sink and stratify in the process of constant-temperature standing, so that the coal tar with low water content and salt content is obtained in the upper layer, and the technical problems of complex operation, high energy consumption and high cost caused by the need to use a large amount of electric desalination and dehydration device and demulsifier in the process of desalination and dehydration of coal tar in the prior art are solved.

[0041] Specifically, the coal tar dehydration and desalination treatment system provided in the utility model is used for the dehydration and desalination treatment of coal tar, the salt removal rate can be more than 80%, the salt content in the raw coal tar can be reduced from 13.2 mg / L to 2.52 mg / L, the coal tar yield can reach 98%, the chlorine ion content in the coal tar can be reduced from 18 ppm to 1.5 ppm, and the water content can be reduced from 3.68 wt% to 0.36 wt%, and the coal tar dehydration and desalination treatment system provided in the utility model can effectively guarantee the dehydration and desalination effect of coal tar while being simple to operate and low in energy consumption.

[0042] Optionally, the coal tar dehydration and desalination treatment system further comprises an impurity recovery assembly, and the impurity recovery assembly is connected with the centrifugal impurity removal assembly.

[0043] In the embodiment, the impurity recovery assembly is used to recycle the mechanical impurities removed by the centrifugal impurity removal assembly when the raw coal tar is centrifugally treated.

[0044] Optionally, the coal tar storage assembly in the utility model is connected with the fluidized bed reaction raw material tank.

[0045] In the embodiment, the coal tar storage assembly is connected with the fluidized bed reaction raw material tank, and the coal tar after dehydration and desalination is input into the fluidized bed for hydrogenation, so that the coal tar is efficiently utilized and the product is high-quality.

[0046] Optionally, the heating and stirring assembly in the utility model is a steam stirrer, and the steam stirrer is also connected with a heat tracing steam pipe network.

[0047] In the embodiment, the salt water and the impurity-removed coal tar are heated and stirred by the steam stirrer, so that the salt water and the impurity-removed coal tar are fully mixed, the steam is used to accelerate the demulsification effect of the emulsified water, and the impurity-removed coal tar is heated, so that the impurity-removed coal tar is stratified in the subsequent constant-temperature standing process. Further, the steam stirrer is provided with a stable and continuous steam source by the heat tracing steam pipe network.

[0048] Further, when the salt water and the impurity-removed coal tar are stirred by the steam stirrer in the embodiment, the steam provided is steam at 0.5 MPa and 151 DEG C, and the stirring rate is 1100 r / min to 1300 r / min, specifically, 1100 r / min, 1200 r / min or 1300 r / min, so that the salt water and the impurity-removed coal tar are fully mixed, the salt in the salt water enters the emulsified water, and the density of the emulsified water is increased.

[0049] Optionally, the coal tar dehydration and desalination treatment system in the utility model further comprises a salt water extraction assembly, and the salt water extraction assembly is connected with the constant-temperature standing assembly and the wastewater treatment system.

[0050] In the embodiment, the salt water in the lower layer of the constant-temperature standing assembly is extracted by the salt water extraction assembly, and the extracted salt water is transported into the wastewater treatment system for treatment and discharge, so that the accumulation of the salt water in the constant-temperature standing assembly is avoided, and the dehydration and desalination treatment efficiency of the coal tar is improved.

[0051] Optionally, the salt water extraction assembly in the utility model is also connected with a salt water storage assembly.

[0052] In the embodiment, the part of the brine at the bottom is subjected to the reflux operation, the brine is refluxed into the brine storage assembly, and after the concentration is adjusted to the required concentration, the brine is used again for heating and stirring in the heating and stirring assembly to perform the desalting and dewatering treatment on the coal tar, the utilization rate is improved, the brine discharge is reduced, and the damage to the environment is reduced.

[0053] Optionally, the extraction assembly in the utility model is also connected with the centrifugal impurity removal assembly.

[0054] In the embodiment, the extraction assembly is also connected with the centrifugal impurity removal assembly, part of the coal tar which has not reached the required dewatering degree is subjected to the reflux operation and enters the centrifugal impurity removal assembly to be subjected to the dewatering and desalting treatment again with the raw coal tar.

[0055] Optionally, the constant-temperature standing assembly in the utility model comprises a plurality of constant-temperature storage tanks, the constant-temperature storage tank comprises a tank body 1 and a plurality of extraction ports 2 arranged on the tank body 1, the tank body 1 is connected with the heating and stirring assembly, and the extraction ports 2 are arranged on the tank body 1 from top to bottom, and the extraction assembly is connected with the extraction ports 2.

[0056] In the embodiment, a plurality of extraction ports 2 arranged from top to bottom are arranged on the tank body 1, so that the coal tar which is subjected to the standing and layering in the tank body 1 is extracted by the extraction assembly, and because there are a plurality of extraction ports 2, different extraction ports can be selected according to the actual layering condition to obtain the dewatered and desalted coal tar.

[0057] Optionally, the tank body 1 in the utility model is also provided with a layering observation window 3 and a plurality of sampling ports 4, and the sampling ports 4 are arranged on the tank body 1 from top to bottom.

[0058] In the embodiment, the tank body 1 is also provided with the layering observation window 3 and the plurality of sampling ports 4, the layering progress of the coal tar in the tank body 1 is observed through the layering observation window 3, and meanwhile, each layer can be sampled through the sampling ports 4 to analyze the water content and the salt content, so that the reflux or extraction operation of the coal tar by the staff is facilitated.

[0059] Optionally, the concentration of the brine stored in the brine storage assembly in the utility model is 20% to 30%.

[0060] In the embodiment, the concentration of the brine stored in the brine storage assembly is 20% to 30%, and when the brine is added into the heating and stirring assembly, the mass of the added brine is 4 to 6 times of the water content in the impurity-removed coal tar, specifically, the mass can be 4 times, 5 times or 6 times, so that the density of the brine is greater than the density of the coal tar, and thus the brine can naturally sink to the bottom layer in the process of constant-temperature standing.

[0061] Further, the salt water includes any one or more of sodium chloride, magnesium chloride or potassium chloride inorganic salt, that is, the salt water used in the embodiment can be associated waste water generated in the desalting operation in the coal tar production process, and in the utility model, the waste water generated in the desalting operation in the coal tar production process can be treated and used as high-concentration salt water in the coal tar dewatering and desalting treatment system in the utility model, so that the waste water is reused, and the discharge amount of the salt-containing waste water is reduced.

[0062] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A coal tar dewatering and desalting treatment system characterized by, The coal tar dewatering and desalting treatment system comprises a centrifugal impurity removal assembly, a heating and stirring assembly, a brine storage assembly, a constant-temperature standing assembly, a extraction assembly and a coal tar storage assembly; The centrifugal impurity removal assembly receives raw coal tar; The brine storage assembly stores brine, and is connected with the heating and stirring assembly; The heating and stirring assembly is connected with the centrifugal impurity removal assembly and the constant-temperature standing assembly; The extraction assembly is connected with the constant-temperature standing assembly and the coal tar storage assembly.

2. The coal tar dewatering and desalting treatment system of claim 1, wherein, The coal tar dewatering and desalting treatment system further comprises an impurity recovery assembly connected with the centrifugal impurity removal assembly.

3. The coal tar dewatering and desalting treatment system of claim 1, wherein, The coal tar storage assembly is connected with a boiling bed reaction raw material tank.

4. The coal tar dewatering and desalting treatment system of claim 1, wherein, The heating and stirring assembly is a steam stirrer, and the steam stirrer is further connected with a heat tracing steam pipe network.

5. The coal tar dewatering and desalting treatment system of claim 1, wherein, The coal tar dewatering and desalting treatment system further comprises a brine extraction assembly connected with the constant-temperature standing assembly and a wastewater treatment system.

6. The coal tar dewatering and desalting treatment system of claim 5, wherein, The brine extraction assembly is further connected with the brine storage assembly.

7. The coal tar dewatering and desalting treatment system of claim 1, wherein, The extraction assembly is further connected with the centrifugal impurity removal assembly.

8. The coal tar dewatering and desalting treatment system of claim 1, wherein, The constant-temperature standing assembly comprises a plurality of constant-temperature storage tanks, and each constant-temperature storage tank comprises a tank body (1) and a plurality of extraction ports (2) arranged on the tank body (1); The tank body (1) is connected with the heating and stirring assembly; The extraction ports (2) are arranged on the tank body (1) from top to bottom, and the extraction assembly is connected with the extraction ports (2).

9. The coal tar dewatering and desalting treatment system of claim 8, wherein, The tank body (1) is further provided with a layered observation window (3) and a plurality of sampling ports (4); The sampling ports (4) are arranged on the tank body (1) from top to bottom.

10. The coal tar dewatering and desalting treatment system according to any one of claims 1 to 9, characterized in that, The concentration of the brine stored in the brine storage assembly is 20% to 30%.

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