Self-cleaning spraying type saturator

Abstract

The utility model provides a self-cleaning spraying type saturator. The self-cleaning spraying type saturator comprises an annular spraying pipe, an annular spraying pipe support, an ammonia mother liquor heat exchanger and a cleaning connector. The annular spraying pipe is made of a 316L stainless steel pipe with the diameter of 65 mm, the annular spraying pipe is connected into two semicircular rings through flanges, the diameter of the annular spraying pipe is 2000 mm, and 16 spraying holes and evenly-distributed nozzles are formed in the annular spraying pipe. And the bracket is welded at a position 30-40mm away from the bottom of the saturator for fixing. The heat exchanger is made of 316L stainless steel, the heat exchange area is 200 m < 3 >, and the heat exchanger is connected to an outlet pipeline of the crystallization pump through a three-way pipeline and a valve. High-temperature ammonia distillation wastewater enters the heat exchanger, mother liquor exchanges heat with the wastewater, the high-temperature mother liquor is used for washing ammonium sulfate accumulated at the bottom of the saturator, meanwhile, the flow and angle of the nozzle can be adjusted through the intelligent nozzle flow adjusting device, and the flow and flow velocity of the ammonia distillation wastewater and the mother liquor are adjusted based on feedback data of a heat exchange efficiency monitoring sensor. And normal production of the saturator is recovered.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal smoke deamination equipment, and particularly relates to a self-cleaning spray type saturator. BACKGROUND

[0002] The ammonia content in the raw coal gas generated by the coke oven is generally 2-6g / m3, and this part of ammonia needs to be removed in the coal gas purification process, otherwise, the ammonia in the coal gas will cause corrosion to the coal gas equipment and facilities, and will seriously affect the normal production of the rear crude benzene process.

[0003] At present, the saturator method is mainly used for producing ammonium sulfate by removing ammonia from the coke oven gas. The specific process is as follows: the coal gas from the desulfurization tower and the ammonia gas at 85-90 DEG C from the ammonia evaporation tower enter the saturator through the central guide pipe, NH3 in the saturator reacts with free acid to produce ammonium sulfate, the reaction formula is 2NH3+H2SO4→(NH4)2SO4, and the remaining components are sent into the coal gas pipeline after leaving the saturator. The ammonium sulfate mother liquor in the saturator is stirred by the large circulating pump, so that the ammonium sulfate crystals precipitated at the bottom of the saturator are in a suspended state, which is beneficial to the growth of the crystals. With the continuous generation of ammonium sulfate, when the crystal ratio reaches 30%, the crystals are sent to the crystallization tank by the crystallization pump, the large particle crystals enter the centrifuge, and the small particle crystals are returned to the saturator together with the mother liquor through the reflux tank. The wet ammonium sulfate from the centrifuge is sent to the drying cooler through the screw conveyor, and the ammonium sulfate dried by air is sent into the storage hopper through the screw conveyor. After being weighed and packaged, the ammonium sulfate is sent to the storage warehouse by the forklift.

[0004] The saturator is the main equipment for producing ammonium sulfate. In actual production, due to the influence of operating conditions and air temperature, ammonium sulfate is often accumulated at the bottom of the saturator. In severe cases, the mother liquor will block the central coal gas guide pipe of the saturator, which not only affects the normal production of the saturator, but also affects the normal transportation of the coal gas. The usual treatment method is to stop the production of the saturator, to flush the accumulated ammonium sulfate in the saturator by heating and adding water at the bottom of the saturator, and to vent at the bottom venting point. If the situation is serious, the coal gas blind plate needs to be blocked, and the personnel need to clean the bottom of the saturator. UTILITY MODEL CONTENTS

[0005] In view of the above technical problems, a self-cleaning spray type saturator is provided. The utility model solves the problem of ammonium sulfate accumulation at the bottom of the spray type saturator and affects the normal production of the saturator without stopping production based on the annular spray pipe.

[0006] To achieve the above purpose, the utility model provides a self-cleaning spray type saturator, which comprises: an annular spray pipe, an annular spray pipe support, an ammonia water mother liquor heat exchanger and a cleaning interface.

[0007] The annular spraying pipe is made of a Φ65mm 316L stainless steel pipe, the diameter of the annular spraying pipe is smaller than the diameter of the bottom of the saturator, 16 spraying holes with a diameter of Φ15mm are arranged on the annular spraying pipe in two rows, and nozzles are welded on the holes;

[0008] The annular spraying pipe support is welded at a position 30-40mm from the bottom of the saturator and is used for fixing the annular spraying pipe;

[0009] The ammonia liquor heat exchanger is made of 316L stainless steel and has a heat exchange area of 200m 3 , which is used for heat exchange between high-temperature ammonia distillation wastewater under the ammonia distillation tower and the mother liquor at the outlet of the crystallization pump.

[0010] The cleaning interface is connected to the ammonia liquor heat exchanger through a DN65 316L stainless steel pipe and is used for introducing the high-temperature mother liquor into the bottom of the saturator for flushing.

[0011] Further, the annular spraying pipe is connected into two semicircles through flanges, the diameter of the annular spraying pipe is 2000mm, and the nozzles on the annular spraying pipe are uniformly distributed, so that the high-temperature mother liquor can be uniformly sprayed on the bottom of the saturator.

[0012] Further, the ammonia liquor heat exchanger is connected to the outlet pipeline of the crystallization pump through a three-way pipeline and a valve, which is used for heat exchange between the high-temperature ammonia distillation wastewater and the mother liquor at the outlet of the crystallization pump, so as to improve the temperature of the mother liquor.

[0013] Further, the intelligent nozzle flow adjusting device is arranged at the nozzle of the annular spraying pipe, which can adjust the flow and angle of the nozzle in real time according to the information fed back by the ammonium sulfate accumulation detection system at the bottom of the saturator.

[0014] Compared with the prior art, the self-cleaning spraying type saturator has the following advantages:

[0015] 1. The self-cleaning spraying type saturator can solve the problem of ammonium sulfate accumulation at the bottom of the spraying type saturator without stopping production.

[0016] 2. The self-cleaning spraying type saturator can reduce the temperature of the 90℃ high-temperature ammonia distillation wastewater after ammonia distillation and reduce the heat load of the circulating water for cooling the high-temperature ammonia distillation wastewater.

[0017] 3. The self-cleaning spraying type saturator can be used as a mother liquor auxiliary heating device, which can heat the mother liquor of the saturator together with the coal gas preheater, so as to ensure that the temperature of the mother liquor is above 55℃ and stabilize the production of ammonium sulfate in the saturator.

[0018] Based on the above reasons, the self-cleaning spraying type saturator can be widely popularized in the field of coal smoke ammonia removal equipment. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Fig. 1 is a self-cleaning spray type saturator structure schematic diagram of the present application;

[0021] Fig. 2 is a self-cleaning spray type saturator annular spray pipe structure schematic diagram of the present application.

[0022] In the figure: 1, secondary spraying mother liquor pump; 2, full tank; 3, emptying pipe; 4, annular spraying device; 5, crystallization pump; 6, mother liquor circulating pump; 7, saturator spraying box; 8, gas outlet; 9, gas inlet; 10, overflow pipe; 11, ammonia water mother liquor heat exchanger; 12, mother liquor inlet valve of heat exchanger; 13, mother liquor to crystallization tank valve; 14, remaining ammonia water inlet valve of heat exchanger; 15, remaining ammonia water heat exchanger outlet valve; 16, connecting flange; 17, spraying hole. DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] It is to be understood that the terms so far as the language goes are used herein only to describe specific embodiments and not intended to limit the example embodiments according to the present application. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0026] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless otherwise specifically stated. It should be apparent that the dimensions of the various parts shown in the drawings are not to scale as the purpose of the drawings is to convey an understanding of the application. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail in order to avoid obscuring the application. In all examples shown and discussed herein, any specific numerical value should be interpreted as merely an example, and not as a limitation. Other examples of the example embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0027] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0028] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0030] like Figs. 1-2 As shown, this utility model discloses a self-cleaning spray saturator, comprising: an annular spray pipe, an annular spray pipe support, an ammonia mother liquor heat exchanger 11, and a cleaning interface.

[0031] The annular spray pipe is made of 316L stainless steel pipe with a diameter of Φ65mm and a diameter smaller than the bottom diameter of the saturator. The annular spray pipe has 16 spray holes 17 in two rows of Φ15mm, and nozzles are welded on the holes.

[0032] A ring-shaped spray pipe support is welded to the bottom of the saturator 30-40mm away to fix the ring-shaped spray pipe.

[0033] Ammonia mother liquor heat exchanger 11, the heat exchanger is made of 316L stainless steel, and the heat exchange area is 200m². 3 It is used to exchange heat between the high-temperature ammonia stripping wastewater under the ammonia stripping tower and the mother liquor at the outlet of crystallization pump 5;

[0034] The cleaning interface is connected to the ammonia mother liquor heat exchanger 11 via a DN65 316L stainless steel pipe, and is used to introduce the high-temperature mother liquor into the bottom of the saturator for flushing.

[0035] Furthermore, the annular spray pipe is connected into two semi-circular rings by connecting flange 16. The diameter of the annular spray pipe is 2000mm, and the nozzles on the annular spray pipe are evenly distributed to ensure that the high-temperature mother liquor can be evenly sprayed onto the bottom of the saturator.

[0036] Further, the ammonia liquor heat exchanger 11 is connected to the outlet pipeline of the crystallization pump 5 through a three-way pipeline and a valve, for heat exchange between the high-temperature ammonia distillation wastewater and the mother liquor at the outlet of the crystallization pump 5, so as to improve the temperature of the mother liquor.

[0037] Further, during the operation of the saturator, when it is detected that the ammonium sulfate is accumulated at the bottom of the saturator, the cleaning operation of the self-cleaning spray saturator is started. First, the inlet valve and the outlet valve of the ammonia distillation wastewater are opened, so that the high-temperature ammonia distillation wastewater at 90°C from the ammonia tower enters the ammonia liquor heat exchanger 11. At the same time, the inlet valve of the mother liquor into the heat exchanger is opened, and the valve of the mother liquor to the crystallization tank is closed, so as to ensure that the mother liquor at the outlet of the crystallization pump 5 can enter the heat exchanger for heat exchange.

[0038] The high-temperature ammonia distillation wastewater and the mother liquor at the outlet of the crystallization pump 5 are heat exchanged in the ammonia liquor heat exchanger 11, and the temperature of the mother liquor gradually rises. With the progress of the heat exchange process, the temperature of the mother liquor at the outlet of the crystallization pump 5 continuously rises, so as to ensure that the temperature of the mother liquor reaches a level at which the ammonium sulfate can be effectively dissolved.

[0039] The high-temperature mother liquor at the outlet of the crystallization pump 5 is sprayed to the bottom of the saturator through an annular spray pipe. The annular spray pipe is made of a Φ65mm 316L stainless steel pipe, and the diameter is smaller than the diameter of the bottom of the saturator. There are 16 holes with a diameter of Φ15mm on the annular spray pipe, and nozzles are welded on the holes. The high-temperature mother liquor is uniformly sprayed to the bottom of the saturator through the nozzles, so as to flush the accumulated ammonium sulfate.

[0040] By using the principle that the solubility of ammonium sulfate increases with the increase of the temperature of the mother liquor, the high-temperature mother liquor continuously flushes the ammonium sulfate at the bottom of the saturator, so that the ammonium sulfate is gradually dissolved. Through the continuous spraying of the annular spray pipe, the accumulated ammonium sulfate is completely dissolved, and the unobstructed state of the bottom of the saturator is restored.

[0041] The flushing operation can be intermittent, and the flushing is performed once every shift, and the time is not less than 30 minutes. Through intermittent flushing, it is ensured that the ammonium sulfate will not be accumulated at the bottom of the saturator again, and the normal operation of the saturator is ensured.

[0042] In winter, when the temperature is low, the temperature of the mother liquor of the saturator may drop below 45°C, which affects the dissolution effect of ammonium sulfate. At this time, the valve from the crystallization pump 5 to the crystallization tank is opened by half, and all the valves of the heat exchanger are fully opened for continuous operation. Through continuous heat exchange, it is ensured that the temperature of the mother liquor is maintained above 55°C, and the yield of ammonium sulfate produced by the saturator method is stabilized.

[0043] During the flushing process, the saturator gas straight-through valve is kept at an opening degree of 30%-50% to prevent the accumulation of ammonium sulfate and ensure the normal delivery of gas. After the flushing is completed, the saturator gas straight-through valve is slowly closed, the resistance of the saturator is monitored, and it is ensured that the resistance is reduced to below 2000Pa to restore the normal production state.

[0044] After the flushing operation is completed, the temperature change of the bottom of the saturator is checked, the temperature of the bottom of the saturator is increased from 15 DEG C to 60 DEG C, the overall temperature of the saturator mother liquor is increased to 50 DEG C, it is ensured that the ammonium sulfate is completely dissolved, and the resistance of the saturator is reduced to below 2000 Pa, and the normal production is restored.

[0045] Further, the coal gas enters the saturator from the coal gas inlet 9, the mother liquor is pumped out from the bottom of the saturator by the mother liquor circulating pump 6, is sprayed through the annular spraying device 4, and circulates in the saturator, and the mother liquor circulating pump 6 plays a key role in circulating power; the secondary spraying mother liquor pump 1 delivers the mother liquor to the upper part of the saturator to perform secondary spraying, and it is ensured that the coal gas and the mother liquor are fully contacted, the coal gas rises in the saturator, and is fully contacted with the mother liquor sprayed by the annular spraying device 4 and the saturator spraying box 7, in this process, the ammonia in the coal gas is absorbed by the mother liquor to form ammonium sulfate crystals.

[0046] After the ammonium sulfate crystals are formed in the saturator, the crystals are pumped out from the bottom of the saturator by the crystallization pump 5, the crystals are delivered to the subsequent processing process, the liquid level of the mother liquor is controlled through the overflow pipe 10 and the full tank 2, it is ensured that the liquid level of the mother liquor in the saturator is stable, and the coal gas after being contacted with the mother liquor and absorbing ammonia is discharged from the saturator through the coal gas outlet 8.

[0047] The mother liquor inlet valve 12 controls the flow of the mother liquor into the ammonia water mother liquor heat exchanger 11, in the heat exchanger, the mother liquor exchanges heat with the remaining ammonia water to adjust the temperature of the mother liquor, the remaining ammonia water inlet valve 14 and the remaining ammonia water heat exchanger outlet valve 15 control the flow of the remaining ammonia water into and out of the heat exchanger to ensure the normal operation of the heat exchange process, the mother liquor to crystallization tank valve 13 controls the flow of the mother liquor to the crystallization tank to ensure the smooth progress of the crystallization process, and the vent pipe 3 is used to vent the liquid or gas in the saturator when the equipment is overhauled or other needs to ensure the safety of the equipment operation.

[0048] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A self-cleaning spray-type saturator, characterized in that, Comprise: Annular spray pipe, annular spray pipe support, ammonia water mother liquor heat exchanger, cleaning interface; The annular spray pipe is made of Φ65mm 316L stainless steel pipe, the diameter is less than the diameter of the saturator bottom, 16 spray holes with Φ15mm are opened on the annular spray pipe, and nozzles are welded on the holes; The annular spray pipe support is welded at 30-40mm of the saturator bottom, which is used for fixing the annular spray pipe; Ammonia liquor heat exchanger, the heat exchanger adopts 316L stainless steel material, and the heat exchange area is 200m 3 For heat exchange between high-temperature ammonia evaporation wastewater under the ammonia evaporation tower and the mother liquor at the outlet of the crystallization pump; The cleaning interface is connected to the ammonia water mother liquor heat exchanger through DN65 316L stainless steel pipe, which is used for introducing high-temperature mother liquor into the saturator bottom for flushing.

2. A self-cleaning spray-type saturator according to claim 1, characterized in that The annular spray pipe is connected into two semicircles through flanges, the diameter of the annular spray pipe is 2000mm, the nozzles on the annular spray pipe are uniformly distributed, which ensures that the high-temperature mother liquor can be uniformly sprayed on the saturator bottom.

3. A self-cleaning spray-type saturator according to claim 1, characterized in that The ammonia water mother liquor heat exchanger is connected to the crystallization pump outlet pipeline through a three-way pipeline and a valve, which is used for heat exchange between high-temperature ammonia vapor waste water and mother liquor at the outlet of the crystallization pump, and improves the temperature of the mother liquor.

4. A self-cleaning spray-type saturator according to claim 1, characterized in that The intelligent nozzle flow adjusting device is arranged at the nozzle head of the annular spray pipe, which adjusts the nozzle flow and angle in real time according to the information fed back by the ammonium sulfate accumulation detection system at the bottom of the saturator.

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