Low-moisture wet quenching flue gas purification system

Abstract

The utility model discloses a low-moisture wet quenching smoke steam purification system which comprises a sedimentation tank and two vertical plates arranged in the sedimentation tank, and the vertical plates divide the inner space of the sedimentation tank into a steam inlet sedimentation chamber, a middle sedimentation chamber and a smoke inlet sedimentation chamber in sequence. A silk screen filter, a middle cyclone filter and a dry type cyclone filter which are communicated are arranged at the tops of the three cavities respectively, a steam inlet is formed in the lower portion of the silk screen filter, a plurality of filtering silk screen layers are arranged above the steam inlet at intervals, a spiral coil is arranged in each filtering silk screen layer, and the spiral coil is communicated with the middle cyclone filter. Heat exchange elbows are arranged in the middle cyclone filter and the dry cyclone filter, the water outlet end of the heat exchange elbow in the middle cyclone filter is communicated with each spiral coil through a pipeline, and a smoke inlet is tangentially formed in the upper part of the dry cyclone filter. In conclusion, the device has the advantages of being high in working efficiency, good in treatment effect and capable of meeting treatment requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas purification, in particular to a low-moisture wet coke quenching flue gas purification system. Background Art

[0002] Coke quenching refers to cooling the refined red-hot coke to a temperature convenient for transportation and storage. The temperature of the coke is generally between 950 and 1100 °C, and after coke quenching, the temperature is reduced to below 250 °C or even lower. Most coke quenching adopts the method of wet coke quenching, which consumes a large amount of water, obtains coke with a relatively high humidity, and needs to be dried subsequently. At the same time, a large amount of flue gas, steam and wastewater are generated, which contain a large amount of highly polluting and difficult-to-degrade substances such as tar, seriously polluting the environment. Some coking plants also adopt the method of dry coke quenching, using cold inert gas to exchange heat with the hot red coke in the dry coke quenching furnace to cool the red coke, and also generating a large amount of flue gas and steam, which will also pollute the environment. In order to meet the actual production needs, some coking plants will also adopt the method of low-moisture wet coke quenching for coke quenching, adopting the combination of inert gas spraying on coke + low-moisture wet spraying coke quenching. After coke quenching, the moisture content in the coke is relatively low, and the coke output and quality can be guaranteed. However, inevitably, a large amount of harmful flue gas and steam will still be generated. In order to protect the environment, these flue gas and steam must be purified.

[0003] As can be seen from the above, the method of low-moisture wet coke quenching is different from separate wet coke quenching and dry coke quenching. If the existing wet coke quenching flue gas treatment system or dry coke quenching flue gas treatment system is directly used to treat the flue gas, it will inevitably cause problems such as low treatment efficiency and poor treatment effect. Moreover, the quenching steam discharged into the atmosphere wastes water, and some particulate matters attached to the steam are also discharged into the atmosphere together with the steam, causing pollution to the atmospheric environment, and cannot better meet the needs of coking plants for environmental protection and flue gas purification. Therefore, it is objectively necessary to develop a low-moisture wet coke quenching flue gas purification system with high working efficiency, good treatment effect and meeting the treatment requirements. Content of the Utility Model

[0004] The purpose of the utility model is to provide a low-moisture wet coke quenching flue gas purification system with high working efficiency, good treatment effect and meeting the treatment requirements.

[0005] The object of the present utility model is achieved as follows. It includes a sedimentation tank and two vertical plates arranged inside it. The vertical plates sequentially divide the internal space of the sedimentation tank into three chambers: a steam inlet sedimentation chamber, a middle sedimentation chamber, and a smoke inlet sedimentation chamber. There is a flow passage connecting each chamber left between the lower end of the vertical plate and the bottom of the sedimentation tank. At the tops of the three chambers, a wire mesh filter, a middle cyclone filter, and a dry cyclone filter that are connected are respectively arranged. At the lower part of the wire mesh filter, there is a steam inlet. Above the steam inlet, a plurality of filter wire mesh layers are arranged at intervals. A spiral coiled pipe is arranged in each filter wire mesh layer. The top of the wire mesh filter is tangentially connected to the inlet of the middle cyclone filter through a pipeline. Heat exchange elbow pipes are arranged in both the middle cyclone filter and the dry cyclone filter. The water outlet end of the heat exchange elbow pipe in the middle cyclone filter is connected to each spiral coiled pipe through a pipeline. At the upper part of the dry cyclone filter, a smoke inlet is tangentially arranged.

[0006] Further, an activated carbon filter is arranged on the exhaust pipes of the middle cyclone filter and the dry cyclone filter.

[0007] Further, a reheater is arranged on the exhaust pipe of the dry cyclone filter.

[0008] Further, an anti-cleaning spray head is arranged in the steam inlet sedimentation chamber above each filter wire mesh layer. The upper part of the sedimentation tank is connected to the anti-cleaning spray head through a return pipe.

[0009] Further, an air distributor connected to the steam inlet is arranged in the wire mesh filter.

[0010] Further, the mesh sizes of the plurality of filter wire mesh layers gradually decrease from bottom to top.

[0011] Further, a temperature regulator is arranged on one side of the sedimentation tank. The outlet ends of the spiral coiled pipes and the outlet ends of the heat exchange elbow pipes in the dry cyclone filter are both connected to the temperature regulator.

[0012] When the utility model is in operation, first connect the steam inlet to the exhaust pipeline of low-moisture wet coke quenching, and connect the smoke inlet to the smoke exhaust port of inert gas jet coke quenching. The smoke and steam generated during the low-moisture wet coke quenching process enter the wire mesh filter and then flow upward, passing through each filter wire mesh layer in turn. Various impurities in the smoke and steam are blocked and intercepted. At the same time, cold water is introduced into the spiral coil. The cold water absorbs the heat in the smoke and steam, and the temperature of the water vapor decreases and condenses into water droplets. The water droplets and impurities together fall into the steam inlet sedimentation chamber. The smoke and steam after filtering impurities enter the middle cyclone filter. On the one hand, the remaining impurities and moisture in the smoke and steam are separated by centrifugal force, and on the other hand, the heat in the smoke and steam is absorbed by the heat exchange elbow pipe to further promote the condensation of water vapor in the smoke and steam. The condensed water droplets and the separated impurities fall into the middle sedimentation chamber, completing the purification treatment of the smoke and steam generated during low-moisture wet coke quenching. At the same time, the flue gas generated by inert gas jet coke quenching enters the dry cyclone filter, and the impurities and a small amount of moisture in the flue gas are separated and removed by centrifugal force and fall into the smoke inlet sedimentation chamber. The heat in the flue gas is absorbed by the heat exchange elbow pipe to promote the condensation of moisture in it, completing the purification treatment of the flue gas generated by inert gas jet coke quenching. According to the characteristics of low-moisture wet coke quenching, the utility model specifically treats the flue gas in the process of inert gas jet coke quenching and the water vapor in low-moisture wet spray coke quenching respectively. Among them, the wire mesh filter and the middle cyclone filter are used to filter and condense the smoke and steam generated by low-moisture wet spray coke quenching. The smoke and steam are filtered and condensed in two stages, which not only reduces the water consumption per ton of coke and reduces the waste of water resources, but also can efficiently remove the particulate impurities attached to the steam, and the treatment effect is good, which can reduce environmental pollution. At the same time, the dry cyclone filter is used to centrifugally filter the flue gas generated in the process of inert gas jet coke quenching, efficiently removing the particulate impurities in the flue gas, and cold water is introduced into the heat exchange elbow pipe to reduce the temperature of the flue gas. While recovering the waste heat, it promotes the condensation of a small amount of moisture in the flue gas and recovers water resources. In this way, the water and impurities separated in the wire mesh filter, the middle cyclone filter and the dry cyclone filter fall into the sedimentation tank. After precipitation, the recycling of water resources is realized, and the whole system can meet the purification treatment of the smoke and steam in the low-moisture wet coke quenching process and the requirements of environmental protection. To sum up, the utility model has the advantages of high working efficiency, good treatment effect and meeting the treatment requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0014] In the figure: 1 - sedimentation tank, 2 - vertical plate, 3 - steam inlet sedimentation chamber, 4 - middle sedimentation chamber, 5 - smoke inlet sedimentation chamber, 6 - wire mesh filter, 7 - middle cyclone filter, 8 - dry cyclone filter, 9 - steam inlet, 10 - filter wire mesh layer, 11 - spiral coil pipe, 12 - heat exchange elbow, 13 - smoke inlet, 14 - activated carbon filter, 15 - recooler, 16 - backwashing nozzle, 17 - return pipe, 18 - air distributor, 19 - temperature regulator. Detailed implementation mode

[0015] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any change or improvement based on the present invention falls within the protection scope of the present invention.

[0016] As Figure 1 shown, the present invention includes a sedimentation tank 1 and two vertical plates 2 arranged inside it. The vertical plates 2 divide the internal space of the sedimentation tank 1 into three chambers: a steam inlet sedimentation chamber 3, a middle sedimentation chamber 4, and a smoke inlet sedimentation chamber 5 in sequence. A flow passage communicating with each chamber is left between the lower end of the vertical plate 2 and the bottom of the sedimentation tank 1. A connected wire mesh filter 6, a middle cyclone filter 7, and a dry cyclone filter 8 are respectively arranged at the tops of the three chambers. The middle cyclone filter 7 and the dry cyclone filter 8 are of the structure of existing cyclone filters, and the purpose of removing impurities is achieved by using centrifugal force. A steam inlet 9 is arranged below the wire mesh filter 6, and a plurality of filter wire mesh layers 10 are arranged at intervals above the steam inlet 9. A spiral coil pipe 11 is arranged in each filter wire mesh layer 10. The top of the wire mesh filter 6 is tangentially connected to the inlet of the middle cyclone filter 7 through a pipeline. Heat exchange elbows 12 are arranged in both the middle cyclone filter 7 and the dry cyclone filter 8. The water outlet end of the heat exchange elbow 12 in the middle cyclone filter 7 is connected to each spiral coil pipe 11 through a pipeline. A smoke inlet 13 is tangentially arranged at the upper part of the dry cyclone filter 8.

[0017] When the utility model is in operation, first, the steam inlet 9 is connected to the exhaust pipeline of low-moisture wet coke quenching, and the smoke inlet 13 is connected to the smoke exhaust port of inert gas jet coke quenching. The smoke and steam generated during the low-moisture wet coke quenching process enter the wire mesh filter 6, then flow upward and pass through each filter wire mesh layer 10 in sequence. Various impurities in the smoke and steam are blocked and intercepted. At the same time, cold water is introduced into the spiral coil 11, and the cold water absorbs the heat in the smoke and steam, and the temperature of the water vapor decreases and condenses into water droplets. The water droplets, together with the impurities, fall into the steam inlet sedimentation chamber 3. The smoke and steam after filtering the impurities enter the middle cyclone filter 7. On the one hand, the remaining impurities and moisture in the smoke and steam are separated by centrifugal force, and on the other hand, the heat exchange elbow 12 is used to absorb the waste heat in the smoke and steam, further promoting the condensation of the water vapor in the smoke and steam. The condensed water droplets, together with the separated impurities, fall into the middle sedimentation tank 4, completing the purification treatment of the smoke and steam generated during low-moisture wet coke quenching. At the same time, the flue gas generated by inert gas jet coke quenching enters the dry cyclone filter 8. The impurities and a small amount of moisture in the flue gas are separated and removed by centrifugal force and fall into the smoke inlet sedimentation chamber 5. The heat exchange elbow 12 is used to absorb the heat in the flue gas, promoting the condensation of the moisture therein, and completing the purification treatment of the flue gas generated by inert gas jet coke quenching. According to the characteristics of low-moisture wet coke quenching, the utility model specifically treats the flue gas during inert gas jet coke quenching and the water vapor during low-moisture wet spray coke quenching. Among them, the wire mesh filter 6 and the middle cyclone filter 7 are used to filter and condense the smoke and steam generated by low-moisture wet spray coke quenching. The smoke and steam are filtered and condensed at two levels, which not only reduces the water consumption per ton of coke and reduces the waste of water resources, but also can efficiently remove the particulate impurities attached to the steam, and the treatment effect is good, which can reduce environmental pollution. At the same time, the dry cyclone filter 8 is used to centrifugally filter the flue gas generated during inert gas jet coke quenching, efficiently removing the particulate impurities in the flue gas, and cold water is introduced into the heat exchange elbow 12 to reduce the temperature of the flue gas. While recovering the waste heat, it promotes the condensation of a small amount of moisture in the flue gas and recovers water resources. In this way, the water and impurities separated in the wire mesh filter 6, the middle cyclone filter 7 and the dry cyclone filter 8 fall into the sedimentation tank. After sedimentation, the recycling of water resources is realized, and the whole system can meet the purification treatment of the smoke and steam during low-moisture wet coke quenching and the requirements of environmental protection.

[0018] An activated carbon filter 14 is provided on the exhaust pipes of the middle cyclone filter 7 and the dry cyclone filter 8. The activated carbon filter 14 is an existing filtration technology, in which activated carbon is provided, which can adsorb various organic substances, odors, colors, heavy metals and other substances, improving the purification effect of the smoke and steam. During actual operation, a sterilization device can also be installed therein to kill microorganisms, viruses, bacteria, etc. in the smoke and steam.

[0019] A reheater 15 is provided on the exhaust pipe of the dry cyclone filter 8. The reheater 15 is an existing heat exchange device used to cool the flue gas. During the operation of the present utility model, the flue gas enters the dry cyclone filter 8 for impurity filtration, and at the same time, cold water is used to absorb the waste heat in the flue gas. However, since the flow rate of the flue gas in the dry cyclone filter 8 is often relatively fast and the heat exchange time is short, the flue gas still contains a relatively large amount of waste heat when it is discharged. At this time, the reheater 15 is used to absorb the waste heat in the flue gas again to further reduce the heat content in the flue gas. In actual use, the reheater 15 can be a plate heat exchanger or a shell-and-tube heat exchanger and other heat exchange structures as long as the heat exchange requirements are met.

[0020] An anti-cleaning spray head 16 is provided in the steam inlet sedimentation chamber 3 above each filter wire mesh layer 10. The upper part of the sedimentation tank 1 is connected to the anti-cleaning spray head 16 through a return pipe 17. During actual operation, as the use time prolongs, more and more impurities will adhere to the wire meshes of the filter wire mesh layer 10, resulting in the reduction of the effective filtration area and the decrease of the filtration efficiency of the flue gas. To prevent this problem, when necessary, the clarified hot water in the sedimentation tank 1 can be extracted as the anti-cleaning water and sprayed onto each filter wire mesh layer 10 from top to bottom to wash away the impurities adhering to the wire meshes and keep the wire meshes unobstructed.

[0021] An air distributor 18 is provided in the wire mesh filter 6 below the filter wire mesh layer 10. The air distributor 18 is connected to the steam inlet 9. The air distributor 18 is an existing technology used to average the distribution of the flue gas on the internal cross-section of the wire mesh filter 6, so that the flue gas can pass through the filter wire mesh layer 10 evenly and improve the filtration efficiency of the flue gas.

[0022] The mesh sizes of the multiple filter wire mesh layers 10 gradually decrease from bottom to top. The flue gas enters the lower part of the wire mesh filter 6 and then flows upward, passing through each filter wire mesh layer 10 in turn, and gradually filtering the impurities and moisture in the flue gas, which can effectively improve the filtration efficiency and filtration effect of the flue gas.

[0023] A thermostat 19 is provided on one side of the sedimentation tank 1. The thermostat 19 is a prior art device used to stir and mix hot water to average the water temperature, so as to provide warm water with relatively stable temperature for later heating and other uses. The outlet end of the spiral coiled pipe 11 and the outlet end of the heat exchange elbow 12 in the dry cyclone filter 8 are both connected to the thermostat 19. During the use of the present utility model, according to the structure of flue gas purification, two streams of hot water will be generated: one comes from the treatment process of low-moisture wet coke quenching flue gas. Cold water first enters the heat exchange elbow 12 in the middle cyclone filter 7, then enters the spiral coiled pipe 11 in the wire mesh filter 6, absorbs the waste heat in the flue gas twice successively, and finally passes into the thermostat 19; the other comes from the treatment process of coke quenching flue gas with inert gas injection. Cold water is passed into the heat exchange elbow 12 in the dry cyclone filter 8 to absorb the waste heat in the flue gas to obtain hot water, which is discharged into the thermostat 19. From the above sources of hot water, it can be seen that the two streams of hot water come from different sources and have different temperatures. They are passed into the thermostat 19 for mixing to average the temperature of the hot water. In the actual production process, the water temperature can be reduced by adding new cold water, or the hot water can be heated to obtain hotter hot water, which can be determined according to actual needs.

Claims

1. A low-moisture wet quenching fume purification system, comprising a sedimentation tank (1) and two vertical plates (2) arranged inside the sedimentation tank, characterized in that The vertical plate (2) divides the internal space of the sedimentation tank (1) into three chambers, namely, a steam inlet sedimentation chamber (3), a middle sedimentation chamber (4) and a smoke inlet sedimentation chamber (5). A flow channel connecting the chambers is left between the lower end of the vertical plate (2) and the bottom of the sedimentation tank (1). The tops of the three chambers are respectively provided with a connected wire mesh filter (6), a middle cyclone filter (7) and a dry cyclone filter (8). A steam inlet (9) is provided at the lower part of the wire mesh filter (6). A plurality of spaced-apart filters are provided above the steam inlet (9). A filter mesh layer (10), each filter mesh layer (10) is provided with a spiral coil (11), the top of the mesh filter (6) is tangentially connected to the inlet of the middle cyclone filter (7) through a pipeline, the middle cyclone filter (7) and the dry cyclone filter (8) are both provided with a heat exchange elbow (12), the water outlet end of the heat exchange elbow (12) in the middle cyclone filter (7) is connected to each spiral coil (11) through a pipeline, and the upper part of the dry cyclone filter (8) is tangentially provided with a smoke inlet (13).

2. A low-moisture wet quenching flue gas purification system according to claim 1, characterized in that An activated carbon filter (14) is provided on the exhaust pipe of the middle cyclone filter (7) and the dry cyclone filter (8).

3. A low-moisture wet quenching flue gas purification system according to claim 1, characterized in that A subcooler (15) is provided on the exhaust pipe of the dry cyclone filter (8).

4. A low-moisture wet quenching flue gas purification system according to claim 1, characterized in that A backwash nozzle (16) is provided in the steam inlet settling chamber (3) above each filter screen layer (10), and the upper part of the settling tank (1) is connected to the backwash nozzle (16) via a return pipe (17).

5. The low-moisture wet quenching flue gas purification system according to claim 1 is characterized in that An aerator (18) is arranged in the wire mesh filter (6) below the filter wire mesh layer (10), and the aerator (18) is connected to the steam inlet (9).

6. The low-moisture wet quenching flue gas purification system according to claim 1 is characterized in that : The mesh sizes of the multiple filter screen layers (10) gradually decrease from bottom to top.

7. The low-moisture wet quenching flue gas purification system according to claim 1 is characterized in that A thermostat (19) is provided on one side of the sedimentation tank (1), and the outlet end of the spiral coil (11) and the outlet end of the heat exchange elbow (12) in the dry cyclone filter (8) are both connected to the thermostat (19).

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