Ammonium sulfate mother liquor acid tar separation device and operation method thereof

Abstract

The present invention relates to an ammonium sulfate mother liquor acid tar separation device and an operation method thereof, belonging to the technical field of chemical equipment, comprising a full flow tank, a mother liquor storage tank, an air spray tower, a spray pump, an exhaust gas fan and a small mother liquor pump, a sealing top cover is installed on the top of the full flow tank, a water seal structure is arranged on the sealing top cover, a concentrated sulfuric acid feeding pipe and a saturator full flow mother liquor feeding pipe are arranged above the full flow tank, the concentrated sulfuric acid feeding pipe and the saturator full flow mother liquor feeding pipe are connected with the water seal structure together and inserted into the bottom of the full flow tank, the small mother liquor pump is connected with the acid tar pipeline via a second valve, and the full flow tank acid tar outlet is connected with the air spray tower via the acid tar pipeline. The present invention realizes the sealing of the top space of the full flow tank, effectively solves the problem of full flow tank tail gas recovery and acid tar separation, has a simple structure, low equipment investment and operation cost, high waste gas treatment efficiency, good acid tar separation effect, and has significant application and promotion value.

Description

Technical Field

[0001] The invention relates to an ammonium sulfate mother liquor acid tar separation device and an operation method thereof, belonging to the technical field of chemical equipment. Background Art

[0002] Ammonia produced in the coking process is generally converted into solid ammonium sulfate product by absorption with dilute sulfuric acid in a saturator, that is, ammonium sulfate mother liquor (mainly composed of dilute sulfuric acid) is directly sprayed on coal gas in the saturator to produce ammonium sulfate. In order to further reduce the ammonia content of coal gas, part of the mother liquor containing less ammonium sulfate crystals in the middle of the saturator overflows through the full flow port of the saturator and flows into the full flow trough, and then is pumped into the back chamber of the saturator by a small mother liquor pump for secondary spraying. In the actual production process, since coal gas also contains a small amount of tar, dust and other impurities, a large amount of foamy acid tar is accumulated on the top of the mother liquor in the full flow trough. In order to avoid affecting the quality of ammonium sulfate products, it is necessary to manually remove it regularly and send it to the acid tar slag box through the acid tar outlet at the top of the full flow trough. The removed acid tar is sent to coal blending treatment.

[0003] At present, the conventional full-flow trough is an open design. On the one hand, part of the CO dissolved and entrained in the mother liquor is emitted into the surrounding atmosphere, causing the alarm to alarm frequently and posing a safety hazard. On the other hand, the overflow of acid gas and ammonia leads to a poor operating environment and seriously pollutes the atmospheric environment of the plant, becoming one of the pollution sources of the coking plant that needs to be solved urgently. In addition, due to the continuous flow of ammonium sulfate mother liquor and the constant stirring of the liquid surface, the tar and mother liquor are not completely separated, and the acidity of the mother liquor is relatively high. The density of the acid tar foam varies greatly, the foam is fine, and it is very difficult to manually collect it, which is labor-intensive. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies in the prior art and to provide an ammonium sulfate mother liquor acid tar separation device and an operating method thereof.

[0005] The present invention is achieved through the following technical solutions:

[0006] That is, an ammonium sulfate mother liquor acid tar separation device, comprising a full flow tank, a mother liquor storage tank, an air spray tower, a spray pump, an exhaust fan and a small mother liquor pump, a sealing top cover is installed on the top of the full flow tank, a water seal structure is arranged on the sealing top cover, a concentrated sulfuric acid feeding pipe and a saturator full flow mother liquor feeding pipe are arranged above the full flow tank, the concentrated sulfuric acid feeding pipe and the saturator full flow mother liquor feeding pipe are connected with the water seal structure and inserted into the bottom of the full flow tank, the upper part of the full flow tank is connected with the mother liquor storage tank through a pipeline, the inlet of the small mother liquor pump is connected with the mother liquor storage tank and the outlet at the bottom of the full flow tank through a pipeline, and the small mother liquor pump is connected with the acid tar pipeline through a second valve;

[0007] The acid tar outlet of the full flow tank is connected to the lower inlet of the air spray tower through the acid tar pipeline, the full flow tank is connected to the sealing top cover through a flange, the tail gas interface on the sealing top cover is connected to the upper inlet of the air spray tower through a pipeline, the tail gas outlet at the top of the air spray tower is connected to the tail gas fan inlet through a pipeline, and the tail gas fan outlet is connected to the dry coke quenching air introduction pipeline through a pipeline, a fourth valve and a flame arrester;

[0008] The liquid phase outlet at the bottom of the air spray tower is connected to the spray pump through a pipeline, and the outlet of the spray pump is connected to the spray port of the air spray tower through a pipeline on one side and connected to the acid-making device through a third valve on the other side.

[0009] The present invention realizes the sealing of the top space of the full flow tank, effectively solves the problem of tail gas recovery and acid tar separation in the full flow tank, has a simple structure, low equipment investment and operating costs, high waste gas treatment efficiency, good acid tar separation effect, and has significant application and promotion value.

[0010] A further improvement of the present invention is that the sealing top cover is provided with an opening, the water seal structure includes an outer ring plate and an inner ring plate fixedly arranged on the edge of the opening, and the water seal structure also includes a cover, the cover includes a water seal cover and an annular folded edge arranged around the water seal cover, and the annular folded edge is located between the outer ring plate and the inner ring plate. The sealing of the top space of the full flow slot adopts a water seal method, the sealing structure is simple, and the sealing effect is good.

[0011] A further improvement of the present invention is that the outer ring plate is higher than the inner ring plate, which prevents the sealing water from rushing out of the water seal and polluting the internal environment.

[0012] A further improvement of the present invention is that the inner ring plate is hollowed out to ensure that the space at the top of the full flow slot is connected to the atmosphere.

[0013] A further improvement of the present invention is that a nitrogen feeding pipe is provided above the full flow tank, and the nitrogen feeding pipe passes through the sealing top cover and extends into the full flow tank. Using nitrogen purging instead of traditional manual scooping of acid tar greatly reduces the labor intensity of scooping acid tar from the full flow tank and improves the efficiency. At the same time, nitrogen acts as an isolation gas, effectively reducing the oxygen content in the tail gas of the full flow tank, avoiding the safety risks caused by carbon monoxide diffusion or gas leakage, and having good safety benefits.

[0014] A further improvement of the present invention is that a blowing structure is installed on the tail end of the nitrogen feeding pipe, and at least one blowing structure installation port is provided on the sealing top cover away from the acid tar outlet, and the blowing structure is connected to the blowing structure installation port through a flange. Nitrogen is sprayed out through the blowing structure, which can achieve better purging and isolation effects.

[0015] A further improvement of the present invention is that the spraying structure includes a short joint, a blind plate cover, a straight joint and a universal nozzle, the nitrogen feeding pipe is connected to the top flange of the short joint through a flange, the short joint passes through and is fixed on the blind plate cover, and the blind plate cover is connected to the sealing top cover flange.

[0016] The present invention also provides an operating method of an ammonium sulfate mother liquor acid tar separation device, comprising the following steps:

[0017] S1: Tightly connect the sealing top cover and the full flow tank through the flange, inject enough clean water into the water seal tank, and close the water seal cover;

[0018] S2: Open the fourth valve, start the exhaust fan, adjust the frequency conversion of the exhaust fan, and control the pressure at the top of the full flow tank to be in a slightly negative pressure state;

[0019] S3: Open the second valve, inject a small amount of mother liquid into the air spray tower, close the third valve, start the spray pump, and close the second valve after the air spray tower circulates and sprays normally;

[0020] S4: Open the first valve, introduce nitrogen into the full flow tank, observe the nitrogen purge angle and the effect of acid tar blowing out, and adjust the blowing nozzle angle to ensure the acid tar flows out stably if necessary;

[0021] S5: When the liquid level at the bottom of the air spray tower reaches the upper limit, open the third valve and send the acid tar to the acid-making device for incineration to produce concentrated sulfuric acid again. When the liquid level at the bottom of the air spray tower drops to the specified range, close the third valve.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention realizes the sealing of the top space of the full flow tank, and uses nitrogen purging instead of traditional manual scooping of acid tar, which effectively solves the problem of tail gas recovery and acid tar separation in the full flow tank, greatly reduces the labor intensity of scooping acid tar in the full flow tank, and has obvious environmental benefits.

[0024] 2. The present invention uses nitrogen as the insulating gas, which effectively reduces the oxygen content in the tail gas of the full flow tank, avoids the safety risks caused by carbon monoxide diffusion or gas leakage, and has good safety benefits.

[0025] 3. The treatment system of the present invention has a simple structure, low equipment investment and operating costs, high waste gas treatment efficiency, good acid tar separation effect, and has significant application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of a specific implementation mode of the present invention.

[0028] Figure 2 It is a schematic diagram of the top structure of the sealing top cover according to a specific embodiment of the present invention.

[0029] Figure 3 It is a structural schematic diagram of the blowing structure of a specific embodiment of the present invention.

[0030] Figure 4 It is a structural schematic diagram of a water seal structure according to a specific embodiment of the present invention.

[0031] In the figure: 1. full flow trough; 2. mother liquid storage tank; 3. sealing top cover; 4. air spray tower; 5. spray pump; 6. exhaust gas fan; 7. spray structure; 8. first valve; 9. water seal cover; 10. water seal trough; 11. small mother liquid pump; 12. second valve; 13. third valve; 14. fourth valve; 15. flame arrester; 16. remote level gauge; 17. remote pressure gauge; 31. exhaust gas interface; 32. mother liquid full flow pipe installation port; 33. spray structure installation port; 71. short joint; 72. blind plate cover; 73. direct joint; 74. universal nozzle; 91. annular folded edge; 101. outer ring plate; 102. inner ring plate. DETAILED DESCRIPTION

[0032] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0033] like Figures 1 to 4 The ammonium sulfate mother liquor acid tar separation device shown comprises a full flow tank 1, a mother liquor storage tank 2, an air spray tower 4, a spray pump 5, an exhaust fan 6 and a small mother liquor pump 11. A sealing top cover 3 is installed at the top of the full flow tank 1. A remote pressure gauge 17 is arranged on the sealing top cover 3, and a high limit and a low limit pressure alarm are arranged. A water seal structure is also arranged on the sealing top cover 3. A concentrated sulfuric acid feeding pipe and a saturator full flow mother liquor feeding pipe are arranged above the full flow tank 1. The concentrated sulfuric acid feeding pipe and the saturator full flow mother liquor feeding pipe are connected to the water seal structure and inserted into the bottom of the full flow tank 1. The upper part of the full flow tank 1 is connected to the mother liquor storage tank 2 through a pipeline. The inlet of the small mother liquor pump 11 is connected to the mother liquor storage tank 2 and the bottom outlet of the full flow tank 1 through a pipeline respectively. The small mother liquor pump 11 is connected to the acid tar pipeline through a second valve 12.

[0034] The acid tar outlet of the full flow tank 1 is connected to the lower inlet of the air spray tower 4 through the acid tar pipeline, the full flow tank 1 is connected to the sealing top cover 3 through a flange, the exhaust gas interface 31 on the sealing top cover 3 is connected to the upper inlet of the air spray tower 4 through a pipeline, the exhaust gas outlet at the top of the air spray tower 4 is connected to the inlet of the exhaust gas fan 6 through a pipeline, the outlet of the exhaust gas fan 6 is connected to the dry quenching air introduction pipeline through the pipeline, the fourth valve 14 and the flame arrester 15, and a remote liquid level gauge 16 is provided at the bottom of the air spray tower 4, and the liquid level gauge is provided with high and low limit alarms.

[0035] The liquid phase outlet at the bottom of the air spray tower 4 is connected to the spray pump 5 via a pipeline. The outlet of the spray pump 5 is connected to the spray port of the air spray tower 4 via a pipeline on one side and is connected to the acid-making device via a third valve 13 on the other side.

[0036] Among them, an opening is provided on the sealing top cover 3, and the water seal structure includes an outer ring plate 101 and an inner ring plate 102 fixedly arranged on the edge of the opening. The water seal structure also includes a cover, which includes a water seal cover 9 and an annular folding edge 91 arranged around the water seal cover 9. The annular folding edge 91 is located between the outer ring plate 101 and the inner ring plate 102. The outer ring plate 101 is higher than the inner ring plate 102 to prevent the sealing water from rushing out of the water seal and polluting the internal environment. The inner ring plate 102 is hollowed out to connect the top space of the full flow groove 1 with the atmosphere. Clean water is injected into the space between the inner and outer ring plates to form an annular water seal groove 10. The water seal cover 9 is a square or circular transparent cover plate. The height of the annular folding edge 91 is greater than the height of the inner ring plate 101 of the annular water seal, and the annular folding edge 91 can fall freely into the annular water seal groove 10.

[0037] A nitrogen feeding pipe is arranged above the full flow tank 1, and the nitrogen feeding pipe passes through the sealing top cover 3 and extends into the full flow tank 1. A first valve 8 is arranged on the nitrogen feeding pipe, and a blowing structure 7 is installed on the tail end of the nitrogen feeding pipe. At least one blowing structure installation port 33 is arranged on the sealing top cover 3 away from the acid tar outlet. The blowing structure 7 is connected to the blowing structure installation port 33 through a flange. The blowing structure 7 includes a short joint 71, a blind plate cover 72, a straight joint 73 and a universal nozzle 74. The nitrogen feeding pipe passes through the method The flange is connected to the top flange of the short joint 71, the short joint 71 passes through and is fixed on the blind cover 72, the gap between the short joint 71 and the blind cover 72 is filled with sealing material, the blind cover 72 is connected to the sealing top cover 3 flange, the bottom of the short joint 71 is a 90° elbow, the end of the elbow is connected to the universal nozzle 74 through a straight joint 73, the installation height of the universal nozzle 74 is higher than the acid tar outlet height of the full flow tank 1 by 0-20cm, and the blowing angle of the universal nozzle 74 is adjustable within 90° vertically and horizontally.

[0038] Among them, a mother liquid full flow pipe installation port 32 is provided on the sealing top cover 3, and the mother liquid full flow pipe installation port 32 extends deep into the bottom of the full flow tank. The gap between the sealing top cover 3 and the mother liquid full flow pipe installation port 32 is sealed with a sealing material.

[0039] The present invention also provides an operating method of an ammonium sulfate mother liquor acid tar separation device, comprising the following steps:

[0040] S1: Tightly connect the sealing top cover 3 and the full flow groove 1 through the flange, inject enough clean water into the water seal groove 10, and close the water seal cover 9;

[0041] S2: Open the fourth valve 14, start the exhaust fan 6, adjust the frequency conversion of the exhaust fan 6, and control the pressure at the top of the full flow tank 1 to be in a slightly negative pressure state;

[0042] S3: Open the second valve 12, inject a small amount of mother liquid into the air spray tower 4, close the third valve 13, start the spray pump 5, and close the second valve 12 after the air spray tower 4 circulates and sprays normally;

[0043] S4: Open the first valve 8, introduce nitrogen into the full flow tank 1, observe the nitrogen purge angle and the effect of acid tar blowing out, and adjust the blowing nozzle angle if necessary to make the acid tar flow out stably;

[0044] S5: After the liquid level at the bottom of the air spray tower 4 reaches the upper limit, the third valve 13 is opened to send the acid tar to the acid-making device for incineration to produce concentrated sulfuric acid again. After the liquid level at the bottom of the air spray tower 4 drops to the specified range, the third valve 13 is closed.

[0045] Working principle:

[0046] The present invention realizes the sealing of the top space of the full flow tank, effectively solves the problem of tail gas recovery and acid tar separation in the full flow tank, has a simple structure, low equipment investment and operating costs, high waste gas treatment efficiency, good acid tar separation effect, and has significant application and promotion value.

[0047] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0048] The terms "upper", "lower", "outer side", "inner side", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish the relative relationship in position if they exist, and do not need to be qualitative. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0049] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ammonium sulfate mother liquor acid tar separation device, comprising a full flow tank (1), a mother liquor storage tank (2), an air spray tower (4), a spray pump (5), an exhaust gas fan (6) and a small mother liquor pump (11), characterized in that: A sealing top cover (3) is installed at the top of the full flow tank (1), and a water seal structure is provided on the sealing top cover (3). A concentrated sulfuric acid feeding pipe and a saturator full flow mother liquor feeding pipe are provided above the full flow tank (1). The concentrated sulfuric acid feeding pipe and the saturator full flow mother liquor feeding pipe are connected to the water seal structure and inserted into the bottom of the full flow tank (1). The upper part of the full flow tank (1) is connected to the mother liquor storage tank (2) through a pipeline. The inlet of the small mother liquor pump (11) is connected to the mother liquor storage tank (2) and the bottom outlet of the full flow tank (1) through a pipeline respectively. The small mother liquor pump (11) is connected to the acid tar pipeline through a second valve (12); The acid tar outlet of the full flow tank (1) is connected to the lower inlet of the air spray tower (4) through the acid tar pipeline, the full flow tank (1) is connected to the sealing top cover (3) through a flange, the tail gas interface (31) on the sealing top cover (3) is connected to the upper inlet of the air spray tower (4) through a pipeline, the tail gas outlet at the top of the air spray tower (4) is connected to the inlet of the tail gas fan (6) through a pipeline, and the outlet of the tail gas fan (6) is connected to the dry quenching air introduction pipeline through a pipeline, a fourth valve (14) and a flame arrester (15); The liquid phase outlet at the bottom of the air spray tower (4) is connected to the spray pump (5) via a pipeline, and the outlet of the spray pump (5) is connected to the spray port of the air spray tower (4) via a pipeline on one side, and is connected to the acid-making device via a third valve (13) on the other side; A nitrogen feeding pipe is provided above the full flow tank (1), and the nitrogen feeding pipe passes through the sealing top cover (3) and extends into the full flow tank (1); A blowing structure (7) is installed on the tail end of the nitrogen feeding pipe, and at least one blowing structure installation port (33) is provided on the sealing top cover (3) away from the acid tar outlet, and the blowing structure (7) is connected to the blowing structure installation port (33) via a flange; The spray structure (7) comprises a short joint (71), a blind plate cover (72), a straight joint (73) and a universal nozzle (74); the nitrogen feeding pipe is connected to the top flange of the short joint (71) via a flange; the short joint (71) passes through and is fixed on the blind plate cover (72); the blind plate cover (72) is connected to the flange of the sealing top cover (3).

2. The ammonium sulfate mother liquor acid tar separation device according to claim 1, characterized in that: The sealing top cover (3) is provided with an opening, and the water seal structure comprises an outer ring plate (101) and an inner ring plate (102) fixedly arranged on the edge of the opening. The water seal structure also comprises a cover, and the cover comprises a water seal cover (9) and an annular folded edge (91) arranged around the water seal cover (9), and the annular folded edge (91) is located between the outer ring plate (101) and the inner ring plate (102).

3. A kind of ammonium sulfate mother liquor acid tar separation device according to claim 2, characterized in that, The outer ring plate (101) is higher than the inner ring plate (102).

4. The ammonium sulfate mother liquor acid tar separation device according to claim 2, characterized in that: The inner ring plate (102) is hollowed out inside.

5. An operating method for an ammonium sulfate mother liquor acid tar separation device, characterized in that: The following steps are involved: S1: Tightly connect the sealing top cover (3) and the full flow groove (1) through the flange, inject sufficient clean water into the water seal groove (10), and close the water seal cover (9); S2: Open the fourth valve (14), start the exhaust fan (6), adjust the frequency conversion of the exhaust fan (6), and control the pressure at the top of the full flow tank (1) to be in a slightly negative pressure state; S3: Open the second valve (12), inject a small amount of mother liquid into the air spray tower (4), close the third valve (13), start the spray pump (5), and close the second valve (12) after the air spray tower (4) circulates and sprays normally; S4: Open the first valve (8), introduce nitrogen into the full flow tank (1), observe the nitrogen purge angle and the effect of acid tar blowing out, and adjust the blowing nozzle angle to ensure that the acid tar flows out stably; S5: After the liquid level at the bottom of the air spray tower (4) reaches the upper limit, the third valve (13) is opened to send the acid tar to the acid production device for incineration to produce concentrated sulfuric acid again. After the liquid level at the bottom of the air spray tower (4) drops to the specified range, the third valve (13) is closed.

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