A water-sealed tank for safe incineration of asphalt smoke and tail gas

Abstract

The present invention relates to the field of coking production technology, and in particular to a water seal tank for safe incineration of asphalt smoke exhaust. It includes a water seal tank body, a cyclone separator, a flue gas cooler and a reducer. The top of the water seal tank body is provided with an asphalt smoke exhaust inlet and a smoke outlet. An inlet pipe is provided below the asphalt smoke exhaust inlet. The bottom of the cyclone separator is connected to the water seal tank body, and the upper part of the cyclone separator is connected to the smoke outlet on the water seal tank body; one end of the smoke cooler is connected to the smoke connecting pipe, and the other end is connected to the smoke outlet; the reducer is fixed to the bottom end of the central pipe of the cyclone separator; a circle of holes is opened around the bottom of the inlet pipe below the asphalt smoke exhaust inlet. The asphalt smoke exhaust inlet pipe buried under the liquid is made to bubble evenly along the surrounding smoke, so as to avoid the danger of water entering the subsequent incineration pipeline, and to avoid the violent fluctuation of the liquid level caused by the gas and liquid being blown vertically to the water surface during the gas-liquid separation at the lower end of the cyclone separator, so as to reduce the influence of the liquid level fluctuation on the floating oil separation.

Description

Technical Field

[0001] The invention relates to the technical field of coking production, and in particular to a water-sealed tank for safe incineration of asphalt smoke tail gas. Background Art

[0002] At present, the following processes are commonly used in the coking industry for asphalt smoke exhaust incineration:

[0003] The asphalt fume tail gas collected by the flue gas main is directly connected to the jet mixer on the oil washing tank. The low naphthalene washing oil distilled from tar is used as the absorbent. The negative pressure generated by the circulating washing oil passing through the nozzle of the jet mixer at high speed is used to suck the asphalt fume gas into the jet mixer and mix it strongly with the washing oil. Most of the harmful substances are absorbed to achieve the purpose of cleaning. The gas-liquid mixture coming out of the jet mixer is separated into gas and liquid in the oil washing tank, and the gas is then sent to the exhaust washing tower connected to the oil washing tank. After being washed again by the circulating spraying of the washing oil, the exhaust tail gas is sent to the incinerator through the exhaust fan to completely remove the remaining harmful substances by combustion.

[0004] In the actual application of the above-mentioned asphalt flue gas incineration process, it was found that combustion sometimes occurs in the flue gas duct that introduces it into the furnace. The reason for this phenomenon is that the asphalt flue gas in the coking industry (including the tail gas generated by processes such as liquid loading and asphalt molding) is mixed with a large amount of air. After being cleaned by the jet mixer, the amount of asphalt flue gas is still large. When it passes through the exhaust washing tower with washing oil spray at the back at high speed, it will carry away a certain amount of washing oil droplets, which will condense on the inner wall of the flue gas duct connected to the incinerator. After a long period of accumulation, it will be ignited at the entrance of the pipe leading to the incinerator furnace, causing danger.

[0005] In order to reduce the possibility of this danger, it is necessary to add a water seal tank near the incinerator on the flue gas pipe connected to the incinerator; however, conventional water seal tanks, such as the gas water seal tanks currently commonly used in coking plants, are only used to discharge gas condensate and overpressure protection, and have no effect on eliminating the above phenomenon. In the ordinary partition-type water seal tanks often used in on-site renovation, the droplets will gather on the liquid surface in the water seal tank, be carried out by the flue gas bubbles, and condense on the pipe leading to the incinerator at the back. Internal combustion still often occurs inside the pipe, but the scope is reduced to the flue gas pipe behind the water seal tank.

[0006] CN201810216581.0 discloses a "safety water seal tank for safe incineration of asphalt smoke exhaust and its working method". Although it overcomes various defects existing in the use of ordinary partition-type water seal tanks and solves the problem of subsequent oil content in flue gas to a certain extent, after production practice, it is found that there are the following deficiencies: the flue gas bubbling of the asphalt smoke exhaust inlet pipe buried under the liquid is uneven, causing violent fluctuations in the liquid level, affecting the sealing effect and the separation and full flow of floating oil, and will cause further vaporization of water; in addition, due to the accompanying heating of the asphalt smoke exhaust pipeline, the flue gas temperature is very high, which will cause the water in the safety water seal tank to vaporize, resulting in the danger of water entering the subsequent incineration pipeline; thirdly, when the gas and liquid are separated at the lower end of the cyclone separator, the gas and liquid are blown vertically to the water surface, which will cause violent fluctuations in the liquid level and affect the separation and full flow of floating oil. Summary of the invention

[0007] In order to overcome the shortcomings of the prior art, the present invention provides a water seal tank for the safe incineration of asphalt smoke exhaust, so that the smoke around the asphalt smoke exhaust inlet pipe buried under the liquid can be evenly bubbled, thereby avoiding the danger of water entering the subsequent incineration pipeline, and avoiding the violent fluctuation of the liquid level caused by the gas and liquid being blown vertically to the water surface during gas-liquid separation at the lower end of the cyclone separator, thereby reducing the influence of liquid level fluctuation on floating oil separation.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A water seal tank for safe incineration of asphalt fume tail gas, comprising a water seal tank body and a cyclone separator, wherein the water seal tank body is a closed tank body, and an asphalt fume tail gas inlet and a smoke outlet are arranged on the top thereof, an inlet pipe is arranged below the asphalt fume tail gas inlet and is inserted below the liquid level in the water seal tank body, the bottom of the cyclone separator is connected with the water seal tank body, a smoke inlet is arranged on the top of the cyclone separator, and the smoke outlet on the water seal tank body is connected through a smoke connecting pipe, and a tail gas outlet is arranged on the top of the cyclone separator;

[0010] It also includes a flue gas cooler and a reducer, one end of the flue gas cooler is connected to the flue gas connecting pipe, and the other end is connected to the flue gas outlet; the reducer is fixed to the bottom end of the central pipe of the cyclone separator; a circle of holes is opened around the bottom of the inlet pipe below the asphalt smoke exhaust inlet.

[0011] The inlet pipe below the asphalt fume exhaust inlet is a detachable insertion pipe.

[0012] The hole is a gate-shaped hole.

[0013] The reducer is in a trapezoidal shape, and the diameter of one end of the reducer connected to the central pipeline is smaller than the diameter of the other end of the reducer.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1) The present invention has a circle of door-shaped holes around the bottom of the asphalt fume exhaust gas inlet pipe, so that the asphalt fume exhaust gas inlet pipe buried under the liquid has uniform fume bubbling along the periphery, and the original fixed insertion pipe is changed to a detachable insertion pipe, which is convenient for future improvement of the opening and change of the buried depth;

[0016] 2) The present invention adds a flue gas cooler to the flue gas connection pipe to condense and cool the water vapor in the safety water seal tank caused by bubbling and evaporation of high-temperature flue gas, and separates it in a cyclone separator to avoid the danger of water entering the subsequent incineration pipe;

[0017] 3) The present invention adds a reducer at the bottom end of the central pipe of the cyclone separator to make the air flow blow obliquely toward the periphery, thereby avoiding the violent fluctuation of the liquid level caused by the gas and liquid being blown vertically toward the water surface during gas-liquid separation at the lower end of the cyclone separator, thereby reducing the influence of liquid level fluctuation on floating oil separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure and process principle of the present invention.

[0019] In the figure: 1. Water seal tank body 2. Liquid seal baffle 3. Cyclone separator 4. Flue gas connecting pipe 5. Exhaust gas incinerator 6. Flue gas cooler 7. Reducer A. Asphalt flue gas inlet B. Industrial water inlet C. Exhaust gas outlet D. Vent E. Flue gas outlet F1. Full flow port 1 F2. Full flow port 2 L1. Liquid level meter interface 1 L2. Liquid level meter interface 2 K. Manhole G. Circulating water inlet H. Circulating water return port DETAILED DESCRIPTION

[0020] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0021] [Example]

[0022] like Figure 1 As shown, a water seal tank for safe incineration of asphalt smoke tail gas includes a water seal tank body 1, a cyclone separator 3, a smoke cooler 6 and a reducer 7.

[0023] The water seal tank body 1 is a closed tank body, and an industrial water inlet B, an asphalt fume exhaust inlet A and a fume outlet E are arranged on the top thereof. The asphalt fume exhaust inlet A is arranged near one end of the water seal tank body 1, and an inlet pipe is arranged below the asphalt fume exhaust inlet A to be inserted below the liquid level in the water seal tank body 1; a cyclone separator 3 is arranged above the water seal tank body 1 near the other end, and the bottom of the cyclone separator 3 is connected to the water seal tank body 1; the fume outlet E is arranged near one side of the asphalt fume exhaust inlet A, and the fume outlet E is connected to the cyclone A liquid seal baffle 2 is provided in the water seal tank body 1 between the air separators 3. The top and both sides of the liquid seal baffle 2 are fixedly connected to the inner wall of the water seal tank body 1. The bottom of the liquid seal baffle 2 is located below the liquid surface, and a water flow channel is provided between it and the bottom surface of the water seal tank body 1. A smoke inlet is provided at the top of the cyclone separator 3, which is connected to the smoke outlet on the water seal tank body 1 through a smoke connecting pipe 4. An exhaust gas outlet C is provided at the top of the cyclone separator 3. A full flow port F1 and a full flow port F2 are provided on both sides of the water seal tank body 1. A vent D is provided at the bottom of the water seal tank body 1, and a manhole K is provided at the top. A liquid level gauge interface L1 and a liquid level gauge interface L2 are provided in the water seal tank body 1.

[0024] The top of the flue gas cooler 6 is connected to the flue gas connecting pipe 4, and the bottom is connected to the flue gas outlet E. The reducer 7 is fixed to the bottom end of the central pipe of the cyclone separator 3. The reducer 7 is truncated, and the diameter of the top of the reducer 7 connected to the central pipe is smaller than the diameter of the bottom of the reducer 7. The inlet pipe below the asphalt flue gas inlet A is a detachable insertion pipe, which is convenient for future improvement of the opening and change of the buried depth. A circle of door-shaped holes is opened around the bottom of the inlet pipe below the asphalt flue gas inlet A.

[0025] The working principle and working process of the present invention are as follows:

[0026] 1) The cleaned asphalt fume exhaust gas pumped by the exhaust fan enters the safety water seal tank through the asphalt fume exhaust gas inlet A. The fume connecting pipe penetrates 200 to 400 mm below the liquid surface. A circle of door-shaped holes or other serrated openings are opened around the bottom of the asphalt fume exhaust gas inlet A to facilitate uniform bubbling of the fume;

[0027] 2) The asphalt flue gas entering the water enters the upper space of the water seal tank body through the liquid seal in a bubbling manner. Since the flue gas pipeline basically adopts accompanying heating, the temperature of the flue gas is very high. When the high-temperature flue gas is bubbling, part of the water vapor will evaporate and enter the flue gas;

[0028] 3) The flue gas containing water vapor enters the flue gas cooler 6 through the flue gas connecting pipe 4 riser. After being condensed and cooled by the circulating water of the flue gas cooler 6, most of the liquid water falls into the safety water seal tank by gravity, and a small amount of water mist enters the cyclone separator 3 along with the flue gas through the flue gas connecting pipe;

[0029] 4) In the cyclone separator 3, the asphalt flue gas is separated into gas and liquid by high-speed rotation. The separated liquid droplets adhere to the wall of the device and flow downward into the water seal tank body on the other side of the liquid seal baffle along with the flue gas flow. Then the flue gas turns back 180 degrees and rises through the central pipe of the cyclone separator, and is sent out from the tail gas outlet at the top of the cyclone separator to the furnace of the tail gas incinerator 5 for incineration;

[0030] 5) In the water seal tank body 1, the droplets separated by the cyclone separator 3 and the trace droplets entrained in the asphalt smoke exhaust captured by the water seal form a layer of floating oil on the liquid surface in the water seal tank body. Industrial water is regularly added to above the full flow port, and it is intermittently discharged through the full flow port 1 F1 and the full flow port 2 F2 for later treatment.

[0031] The present invention opens holes around the bottom of the asphalt smoke tail gas inlet A pipe so that the buried submerged smoke inlet pipe can bubble evenly around the smoke, thereby reducing the impact of liquid level fluctuations on sealing and floating oil separation; a smoke cooler 6 is added to the smoke connecting pipe to condense and cool the water vapor in the safety water seal tank evaporated by the bubbling of high-temperature smoke, and separates it in the cyclone separator 3 to avoid the danger of subsequent incineration pipelines; a reducer 7 is added to the bottom end of the central pipe of the cyclone separator 3 to make the air flow blow obliquely toward the periphery, thereby avoiding the violent fluctuation of the liquid level caused by the gas and liquid blowing vertically toward the water surface when the gas and liquid are separated at the lower end of the cyclone separator 3, thereby reducing the impact of liquid level fluctuations on floating oil separation.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A water seal tank for safe incineration of asphalt fume tail gas, comprising a water seal tank body and a cyclone separator, wherein the water seal tank body is a closed tank body, and an asphalt fume tail gas inlet and a smoke outlet are arranged on the top thereof, an inlet pipe is arranged below the asphalt fume tail gas inlet and is inserted below the liquid level in the water seal tank body, the bottom of the cyclone separator is connected with the water seal tank body, a smoke inlet is arranged on the top of the cyclone separator, and the smoke outlet on the water seal tank body is connected through a smoke connecting pipe, and a tail gas outlet is arranged on the top of the cyclone separator; Features: It also includes a flue gas cooler and a reducer, one end of the flue gas cooler is connected to the flue gas connecting pipe, and the other end is connected to the flue gas outlet; the reducer is fixedly connected to the bottom end of the central pipe of the cyclone separator; a circle of holes is opened around the bottom of the inlet pipe below the asphalt flue gas inlet, and the holes are door-shaped holes; The inlet pipe below the asphalt fume exhaust inlet is a detachable insertion pipe; The reducer is in a trapezoidal shape, and the diameter of one end of the reducer connected to the central pipeline is smaller than the diameter of the other end of the reducer.

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