A tar residue treatment system

Abstract

The present invention discloses a tar residue processing system, which first uses a high-temperature alkaline liquid environment unit to provide a high-temperature alkaline liquid environment for the tar residue, and uses a stirring device to stir it at the same time, that is, to achieve the primary separation of the tar residue; then, a slag extraction device is used to send the tar residue after the primary separation into a filter press device for secondary separation, and the separated tar residue is sent to a first carbonization device for high-temperature dry distillation to achieve tertiary separation and produce raw coal gas and coke powder. The present invention can achieve efficient and thorough recovery of tar residue through three-step separation treatment of tar residue, and the coal tar, coke powder and other products generated in each separation process can be sold or used by the enterprise, which not only avoids various problems caused by improper treatment of tar residue, but also brings additional economic benefits to the enterprise; at the same time, most of the equipment in the present invention are commonly used equipment in coal enterprises, and do not use high-cost, high-polluting equipment and materials, low cost and environmentally friendly, and very easy to achieve large-scale and continuous.

Description

Technical field:

[0001] The invention relates to the technical field of coal chemical industry, and in particular to a tar residue processing system. Background technology:

[0002] In the traditional coking route, when the coke oven gas is cooled by ammonia spray in the gas collecting pipe or primary cooler, high-boiling-point organic compounds will be condensed to form coal tar. At the same time, coal powder and semi-coke carried in the gas are also mixed in the coal tar to form tar residue. Tar residue is a viscous waste residue, the main components of which are carbon-containing substances such as coal dust, coke powder, coal tar, asphaltene, and polycyclic aromatic hydrocarbons. It is a toxic and harmful solid waste residue. If it is not handled properly, it will not only easily cause environmental pollution, but also waste resources. Some of the high-boiling-point polycyclic aromatic hydrocarbons will produce strong carcinogens such as benzopyrene when they are not completely burned, which will seriously pollute the atmosphere and endanger people's health. However, if it is handled properly, it will bring benefits.

[0003] At present, the treatment methods of tar residue can be divided into two categories: the first category is to use physical methods to separate the oil and residue in the tar residue, recover the valuable tar for further processing and utilization, and the common methods are solvent extraction separation and mechanical centrifugal separation. The second category is to use tar residue as fuel, coal blending additive or to develop and utilize it as a resource. The common methods are coal blending for coking, fuel and preparation of activated carbon. However, there are still many shortcomings in various treatment methods. For example, it is difficult to find efficient, green and environmentally friendly organic solvents in solvent extraction separation, and the high cost of the extractant will further increase the production cost; the mechanical centrifugal separation effect is not thorough enough, which may cause inconvenience in subsequent treatment, and the purchase cost and operation and maintenance cost of centrifugal equipment are high, which is not suitable for application in most coal enterprises; coal blending for coking or direct use as fuel will not fully utilize the resources, and may even cause pollutant emissions to exceed the standard. Summary of the invention:

[0004] The purpose of the present invention is to provide a tar residue treatment system which is efficient, environmentally friendly, low-cost, and completely recyclable and easy to implement on a large scale and continuously.

[0005] The present invention is implemented by the following technical scheme: a tar residue treatment system, which includes a high-temperature alkaline liquid environment unit, a stirring device, a residue extraction device, a static stratification device, a filter press device and a first carbonization device;

[0006] The stirring device and the slag extraction device are both arranged in the high-temperature alkaline liquid environment unit, the liquid outlet of the high-temperature alkaline liquid environment unit is connected with the liquid inlet of the static stratification device, the discharge port of the slag extraction device is connected with the feed port of the filter press device, and the slag discharge port of the filter press device is connected with the feed port of the first carbonization device.

[0007] Furthermore, the high-temperature alkaline liquid environment unit includes a heating device and an alkali liquid device, the discharge port of the heating device is connected to the feed port of the alkali liquid device, the liquid outlet of the alkali liquid device is connected to the liquid inlet of the static stratification device, the stirring device and the slag extraction device are both arranged in the alkali liquid device, and the feed port of the slag extraction device is arranged at the bottom of the alkali liquid device.

[0008] Furthermore, the liquid outlet of the static stratification device is communicated with the liquid inlet of the alkali solution device.

[0009] Furthermore, the high-temperature alkaline liquid environment unit includes a second carbonization device, a second gas purification device and a tar collection device. The gas outlet of the second carbonization device is connected to the gas inlet of the second gas purification device. An ammonia water spraying device is arranged in the second gas purification device. The liquid outlet of the second gas purification device is connected to the liquid inlet of the tar collection device. The liquid outlet of the tar collection device is connected to the liquid inlet of the static stratification device. The stirring device and the slag extraction device are both arranged in the tar collection device, and the feed port of the slag extraction device is arranged at the bottom of the tar collection device.

[0010] Furthermore, the high-temperature alkaline liquid environment unit also includes a circulating ammonia water device, the liquid outlet of the static stratification device is connected to the liquid inlet of the circulating ammonia water device, and the liquid outlet of the circulating ammonia water device is connected to the liquid inlet of the ammonia water spraying device.

[0011] Furthermore, the static stratification device comprises a plurality of static tanks connected in series, and the initial liquid inlets of the plurality of static tanks connected in series are connected to the liquid outlet of the high-temperature alkaline liquid environment unit.

[0012] Furthermore, it also includes a first coal gas purification device, and the air inlet of the first coal gas purification device is connected to the air outlet of the first carbonization device.

[0013] Furthermore, the stirring device is a stirring pump, and the filter pressing device is a filter press.

[0014] Furthermore, the slag extraction device is a submersible pump.

[0015] Furthermore, the first carbonization device is a carbonization furnace.

[0016] Advantages of the present invention:

[0017] The tar residue treatment system provided by the present invention includes a high-temperature alkaline liquid environment unit, a stirring device, a slag extraction device, a static stratification device, a filter press device and a first carbonization device; first, the high-temperature alkaline liquid environment unit is used to provide a high-temperature alkaline liquid environment for the tar residue to reduce the viscosity of the tar residue, and the stirring device is used to stir it, that is, the primary separation of the tar residue is achieved; then the slag extraction device is used to send the tar residue after the primary separation into the filter press device for secondary separation, and the separated tar residue is sent to the first carbonization device for high-temperature dry distillation to achieve three separations, and produce raw coal gas and coke powder. The tar residue treatment system of the present invention can achieve efficient and thorough recovery of tar residue through three-step separation treatment of tar residue, and the coal tar, coke powder and other products generated in each separation process can be sold or used by the enterprise, which not only avoids various problems caused by improper treatment of tar residue, but also brings additional economic benefits to the enterprise; at the same time, most of the equipment in the present invention are commonly used equipment in coal enterprises, and do not use high-cost, high-polluting equipment and materials, low cost and environmentally friendly, and very easy to achieve large-scale and continuous.

[0018] Furthermore, the tar residue treatment system provided by the present invention can also utilize the equipment in the traditional coking route to provide a high-temperature alkaline liquid environment for the tar residue, that is, utilize the carbonization device, gas purification device and tar collection device in the traditional coking route as a high-temperature alkaline liquid environment unit, which greatly simplifies the tar residue treatment process and reduces the need for additional tar residue treatment equipment and materials, making it very convenient for ordinary coal enterprises to adopt and implement. Description of the drawings:

[0019] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0020] Figure 2 It is a structural diagram of embodiment 2 of the present invention.

[0021] The markings of the components in the accompanying drawings are as follows:

[0022] The high temperature alkaline liquid environment unit 10, the heating device 110, the feed port 1101 of the heating device 110, the discharge port 1102 of the heating device 110, the alkali liquid device 120, the feed port 1201 of the alkali liquid device 120, the liquid outlet 1202 of the alkali liquid device 120, the liquid inlet 1203 of the alkali liquid device 120, the second carbonization device 130, the gas outlet 1302 of the second carbonization device 130, the second coal gas purification device 140, the gas inlet 1401 of the second coal gas purification device 140, the ammonia water spraying device 141, the liquid inlet 1411 of the ammonia water spraying device 141, the liquid outlet 1402 of the second coal gas purification device 140, the tar collecting device 150, the liquid inlet 1501 of the tar collecting device 150, The liquid outlet 1502 of the oil collecting device 150, the circulating ammonia water device 160, the liquid inlet 1601 of the circulating ammonia water device 160, the liquid outlet 1602 of the circulating ammonia water device 160, the stirring device 20, the slag extraction device 30, the feed inlet 301 of the slag extraction device 30, the discharge port 302 of the slag extraction device 30, the filter press device 40, the feed inlet 401 of the filter press device 40, the slag discharge port 402 of the filter press device 40, the first carbonization device 50, the feed inlet 501 of the first carbonization device 50, the gas outlet 502 of the first carbonization device 50, the standing tank 60, the initial liquid inlet 601 of the standing tank 60, the final liquid outlet 602 of the standing tank 60, the first coal gas purification device 70, the gas inlet 701 of the first coal gas purification device 70. Specific implementation method:

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] Embodiment 1:

[0025] like Figure 1 As shown, this embodiment provides a tar residue treatment system, which includes a high-temperature alkaline liquid environment unit 10, a stirring device 20, a residue extraction device 30, a static stratification device, a filter press device 40 and a first carbonization device 50;

[0026] The stirring device 20 and the slag extraction device 30 are both arranged in the high-temperature alkaline liquid environment unit 10, the liquid outlet of the high-temperature alkaline liquid environment unit 10 is connected to the liquid inlet of the static stratification device, the discharge port 302 of the slag extraction device 30 is connected to the feed port 401 of the filter press device 40, and the slag discharge port 402 of the filter press device 40 is connected to the feed port 501 of the first carbonization device 50.

[0027] It should be noted that under high-temperature alkaline liquid environment, the viscosity of tar residue decreases, and the coal tar therein is easier to separate. At the same time, stirring the solution can make the separation process of tar residue easier. This design can efficiently separate coal tar from tar residue under extremely common, simple and environmentally friendly equipment and material conditions, and has great promotion and application value.

[0028] By setting a high-temperature alkaline liquid environment unit 10 to provide a high-temperature alkaline liquid environment for the tar residue, the viscosity of the tar residue is reduced, making it easier to separate from the tar, and at the same time, the stirring device 20 is used for stirring to achieve the initial separation of the tar residue, and the liquid product after the tar residue is separated can be sent to the static stratification device for separation; then the tar residue after the initial separation is sent to the filter press device 40 for secondary separation using the slag extraction device 30, and the separated tar residue is sent to the first carbonization device 50 for high-temperature dry distillation to achieve three separations, and produce raw coal gas and coke powder. The tar residue treatment system of this embodiment can achieve efficient and thorough recovery of tar residue through three-step separation treatment of tar residue, and the coal tar, coke powder and other products produced in each separation process can be sold or used by oneself, which not only avoids various problems caused by improper treatment of tar residue, but also brings additional economic benefits to the enterprise; at the same time, most of the equipment in this embodiment are commonly used equipment in coal enterprises, and do not use high-cost, high-polluting equipment and materials, low cost and environmentally friendly, and very easy to achieve large-scale and continuous.

[0029] It should be noted that the optional conditions for stirring the tar residue in the high-temperature alkaline liquid environment unit 10 are: temperature of 72° C.-80° C., pH value of 7.6-9.2, and stirring speed of 1280 r / min.

[0030] It should be noted that the temperature of high-temperature carbonization of the tar residue in the first carbonization device 50 is 620°C-720°C, which is higher than the high-temperature carbonization temperature (550°C-580°C) of the carbonization device in the traditional coking route, so as to decompose the tar residue more completely.

[0031] As an example, the high-temperature alkaline liquid environment unit 10 includes a heating device 110 and an alkali liquid device 120, the discharge port 1102 of the heating device 110 is connected to the feed port 1201 of the alkali liquid device 120, the liquid outlet 1202 of the alkali liquid device 120 is connected to the liquid inlet of the static stratification device, the stirring device 20 and the slag extraction device 30 are both arranged in the alkali liquid device 120, and the feed port 301 of the slag extraction device 30 is arranged at the bottom of the alkali liquid device 120.

[0032] It should be noted that the liquid product after the tar residue is separated in the alkaline liquid device 120 is sent to the static stratification device for static stratification, so that the tar and the alkaline liquid can be separated.

[0033] It should be noted that the alkali solution device 120 may be an ammonia water tank.

[0034] As an example, the liquid outlet of the static stratification device is connected to the liquid inlet 1203 of the alkali solution device 120 .

[0035] It should be noted that the alkaline liquid separated from the static stratification device is sent back to the alkaline liquid device 120 for recycling, which can effectively avoid the waste of resources and greatly save the processing cost.

[0036] As an example, the static stratification device includes a plurality of static tanks 60 connected in series, and the initial liquid inlet 601 of the plurality of static tanks 60 connected in series is connected to the liquid outlet of the high-temperature alkaline liquid environment unit 10. Specifically, the initial liquid inlet 601 of the plurality of static tanks 60 connected in series is connected to the liquid outlet 1202 of the alkaline liquid device 120.

[0037] It should be noted that the plurality of static tanks 60 connected in series can be connected to the liquid inlet 1203 of the alkali liquid device 120 through the final liquid outlet 602, or can be connected to the liquid inlet 1203 of the alkali liquid device 120 through the total liquid outlet after the liquid outlets on each static tank 60 are collected. The specific connection method can be set according to the actual situation. Figure 1 In the figure, the example of connecting the tail liquid outlet 602 with the liquid inlet 1203 of the alkali liquid device 120 is taken as an example.

[0038] As an example, the tar residue treatment system of this embodiment also includes a first coal gas purification device 70, and the air inlet 701 of the first coal gas purification device 70 is connected to the air outlet 502 of the first carbonization device 50 to cool and purify the raw coal gas generated in the first carbonization device 50, and further separate the coal tar contained in the raw coal gas.

[0039] It should be noted that the first coal gas purification device 70 may include a gas collecting pipe, a venturi tower, a cyclone tower and an electric tar collector. The above equipment are all existing technologies and will not be described in detail here. The specific equipment combination can be selected according to actual needs.

[0040] As an example, the stirring device 20 is a stirring pump, and the filter pressing device 40 is a filter press.

[0041] As an example, the slag extraction device 30 is a submersible pump.

[0042] As an example, the first carbonization device 50 is a carbonization furnace.

[0043] The specific usage of this embodiment is as follows:

[0044] The tar residue is fed into the heating device 110 through the feed port 1101 of the heating device 110 for heating, and then fed into the alkali liquid device 120 through the feed port 1201 of the alkali liquid device 120. Under the stirring action of the stirring device 20, the tar residue can be initially separated. The tar residue after the initial separation is pumped into the filter press device 40 through the slag extraction device 30 for secondary separation, and the liquid product obtained after the initial separation is transported to the static tank 60 for static stratification, thereby separating the tar and the alkaline liquid; the filter press device 40 can further Part of the coal tar in the tar residue is separated, and the separated tar residue is sent to the first carbonization device 50 for high-temperature distillation after secondary separation by the filter press device 40 to achieve tertiary separation, and produce raw coal gas and coke powder. The raw coal gas is further cooled and purified by the first coal gas purification device 70 to separate the coal tar contained in the raw coal gas. The coal tar, coke powder and other products produced in each separation and treatment step can be sold or used by oneself. In actual application, the tar residue reaches a recovery rate of nearly 100% after being treated by the system of this embodiment.

[0045] Embodiment 2:

[0046] like Figure 2 As shown, this embodiment provides a tar residue treatment system, and its basic structure is the same as that in the first embodiment, which will not be described here. The difference between it and the first embodiment is that:

[0047] In this embodiment, the high-temperature alkaline liquid environment unit 10 includes a second carbonization device 130, a second gas purification device 140 and a tar collection device 150. The gas outlet 1302 of the second carbonization device 130 is connected to the gas inlet 1401 of the second gas purification device 140. An ammonia water spraying device 141 is arranged in the second gas purification device 140. The liquid outlet 1402 of the second gas purification device 140 is connected to the liquid inlet 1501 of the tar collection device 150. The liquid outlet 1502 of the tar collection device 150 is connected to the liquid inlet of the static stratification device. The stirring device 20 and the slag extraction device 30 are both arranged in the tar collection device 150, and the feed port 301 of the slag extraction device 30 is arranged at the bottom of the tar collection device 150.

[0048] It should be noted that the second carbonization device 130, the second coal gas purification device 140 and the tar collection device 150 in the tar residue treatment system of the present embodiment are all equipment in the conventional coking route, wherein the furnace temperature of the second carbonization device 130 is 580°C-620°C, which is higher than the furnace temperature (550°C-580°C) of the carbonization device in the conventional coking route, so as to increase the temperature of the outgoing coal gas, thereby increasing the temperature of the tar residue collected after being sprayed by the ammonia water spraying device 141 in the subsequent second coal gas purification device 140, and then the high-temperature tar residue mixed with ammonia water collected by the tar collection device 150 can be stirred as the tar residue placed in a high-temperature alkaline liquid environment.

[0049] It should be noted that the second carbonization device 130 can be a carbonization furnace; the second coal gas purification device 140 can include a gas collecting pipe, a Venturi tower, a cyclone tower and an electric tar collector; the ammonia spray device 141 can include an ammonia sprayer, an ammonia spray pipe, etc. The specific equipment combination can be selected according to actual needs; the tar collection device 150 can be a tar collection tank. The above equipment is all existing technology and will not be repeated here.

[0050] This embodiment utilizes the equipment in the traditional coking route to directly provide a high-temperature alkaline liquid environment for the tar residue, that is, the carbonization device, gas purification device and tar collection device in the traditional coking route are used as the high-temperature alkaline liquid environment unit 10, which greatly simplifies the tar residue treatment process and reduces the need for additional tar residue treatment equipment and materials, which is very convenient for ordinary coal enterprises to adopt and implement.

[0051] As an example, the static stratification device includes a plurality of static tanks 60 connected in series, and the initial liquid inlet 601 of the plurality of static tanks 60 connected in series is connected to the liquid outlet of the high-temperature alkaline liquid environment unit 10. Specifically, the initial liquid inlet 601 of the plurality of static tanks 60 connected in series is connected to the liquid outlet 1502 of the tar collection device 150.

[0052] As an example, the high-temperature alkaline liquid environment unit 10 also includes a circulating ammonia water device 160 , the liquid outlet of the static stratification device is connected to the liquid inlet 1601 of the circulating ammonia water device 160 , and the liquid outlet 1602 of the circulating ammonia water device 160 is connected to the liquid inlet 1411 of the ammonia water spraying device 141 .

[0053] It should be noted that the circulating ammonia water device 160 can be a circulating ammonia water system in a traditional coking route, which is a prior art and will not be described in detail here.

[0054] It should be noted that the plurality of static tanks 60 connected in series can be connected to the liquid inlet 1601 of the circulating ammonia water device 160 through the final liquid outlet 602, or can be connected to the liquid inlet 1601 of the circulating ammonia water device 160 through the total liquid outlet after the liquid outlets on each static tank 60 are collected. The specific connection method can be set according to the actual situation. Figure 2 In the figure, the example of connecting the tail liquid outlet 602 with the liquid inlet 1601 of the circulating ammonia water device 160 is taken.

[0055] It should be noted that the liquid product entering the static stratification device in this embodiment is a tar-ammonia mixture. After static stratification, the separated ammonia is sent to the circulating ammonia system in the traditional coking route for recycling, which can effectively avoid waste of resources and greatly save processing costs.

[0056] In practical applications, the recovery rate of tar residue after being treated by the system of this embodiment is close to 100%.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tar residue treatment system, characterized in that: It includes a high-temperature alkaline liquid environment unit, a stirring device, a slag extraction device, a static stratification device, a filter press device and a first carbonization device; The stirring device and the slag extraction device are both arranged in the high-temperature alkaline liquid environment unit, the liquid outlet of the high-temperature alkaline liquid environment unit is connected with the liquid inlet of the static stratification device, the discharge port of the slag extraction device is connected with the feed port of the filter press device, and the slag discharge port of the filter press device is connected with the feed port of the first carbonization device.

2. A tar residue treatment system according to claim 1, characterized in that: The high-temperature alkaline liquid environment unit includes a heating device and an alkali liquid device, the discharge port of the heating device is connected to the feed port of the alkali liquid device, the liquid outlet of the alkali liquid device is connected to the liquid inlet of the static stratification device, the stirring device and the slag extraction device are both arranged in the alkali liquid device, and the feed port of the slag extraction device is arranged at the bottom of the alkali liquid device.

3. A tar residue treatment system according to claim 2, characterized in that: The liquid outlet of the static stratification device is communicated with the liquid inlet of the alkali solution device.

4. A tar residue treatment system according to claim 1, characterized in that: The high-temperature alkaline liquid environment unit includes a second carbonization device, a second gas purification device and a tar collection device. The gas outlet of the second carbonization device is connected to the gas inlet of the second gas purification device. An ammonia water spraying device is arranged in the second gas purification device. The liquid outlet of the second gas purification device is connected to the liquid inlet of the tar collection device. The liquid outlet of the tar collection device is connected to the liquid inlet of the static stratification device. The stirring device and the slag extraction device are both arranged in the tar collection device, and the feed port of the slag extraction device is arranged at the bottom of the tar collection device.

5. A tar residue treatment system according to claim 4, characterized in that: The high temperature alkaline liquid environment unit also includes a circulating ammonia water device, the liquid outlet of the static stratification device is connected to the liquid inlet of the circulating ammonia water device, and the liquid outlet of the circulating ammonia water device is connected to the liquid inlet of the ammonia water spraying device.

6. A tar residue treatment system according to any one of claims 1 to 5, characterized in that: The static stratification device comprises a plurality of static tanks connected in series, and the initial liquid inlets of the plurality of static tanks connected in series are connected to the liquid outlet of the high-temperature alkaline liquid environment unit.

7. A tar residue treatment system according to any one of claims 1 to 5, characterized in that: It also includes a first coal gas purification device, wherein the air inlet of the first coal gas purification device is connected with the air outlet of the first carbonization device.

8. A tar residue treatment system according to any one of claims 1 to 5, characterized in that: The stirring device is a stirring pump, and the filter pressing device is a filter press.

9. A tar residue treatment system according to any one of claims 1 to 5, characterized in that: The slag extraction device is a submersible pump.

10. A tar residue treatment system according to any one of claims 1 to 5, characterized in that: The first carbonization device is a carbonization furnace.

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