Spray type saturator

Abstract

The utility model relates to a spray type saturator which comprises a separation chamber and a crystallization chamber which are communicated through a downcomer, a reverse spraying pipe and an empty spraying pipe are arranged at the upper part of the separation chamber; the upper end of the reverse spraying pipe is a coal gas inlet, and the lower end is internally provided with a primary mother liquor nozzle; the inlet of the pipeline extends out of the side part of the separation chamber; a coal gas outlet is formed in the upper end of the air spray pipe, and a secondary mother liquor spray head and a demister are sequentially arranged in the air spray pipe from bottom to top; the inlet of the pipeline extends out of the side part of the empty spraying pipe; and the primary mother liquor spray head is a dynamic wave spray head. The demister has the advantages of low power consumption, high demisting efficiency, high deamination efficiency and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven gas purification, in particular to a spray type saturator. Background Art

[0002] The spray saturator is a common device that uses sulfuric acid to absorb ammonia in the gas to produce ammonium sulfate. The device integrates absorption, demisting and crystallization, and has significant advantages such as high equipment integration, convenient operation, and low gas resistance. It is particularly suitable for removing ammonia from coke oven gas.

[0003] The existing spray saturator is mainly composed of an upper spray chamber and a lower crystallization chamber. The upper spray chamber is composed of a body, an outer sleeve and an inner sleeve. A cyclone separator is formed between the outer sleeve and the inner sleeve, which acts as an acid remover. The coal gas enters the body from the upper front chamber of the saturator, and then goes down into the annular spray chamber formed between the body and the outer sleeve on both sides. There are multiple nozzles with a certain inclination in each spray chamber to ensure that the sprayed ammonium sulfate mother liquor in the front chamber is fully in contact with the coal gas. The coal gas coming out of the annular spray chamber merges into one stream in the rear chamber of the saturator, and after being sprayed by the ammonium sulfate mother liquor in the rear chamber, it enters the cyclone separator in the tangential direction at the top, and after removing the entrained mother liquor, it enters the central pipe, and leaves the saturator through the top coal gas outlet. The lower part of the spray chamber is the crystallization chamber, which is connected to the spray chamber by a downcomer. The mother liquor sprayed in the spray chamber flows into the crystallization chamber through the downcomer, and then returns upward from the bottom of the crystallization chamber to stir the mother liquor, and the ammonium sulfate crystal nuclei are continuously generated and grown, and the particles are graded to complete the circulation and stirring process. The crystals formed at the bottom of the crystallization chamber are pumped out by the pump through the crystallization outlet.

[0004] Although the existing spray saturator has significant advantages and is widely used, it also has its disadvantages, such as large amount of mother liquor circulation spraying and high power consumption; low demisting efficiency of cyclone separator and large amount of mother liquor entrainment in the outlet gas; and low deammoniation efficiency. Summary of the invention

[0005] The utility model provides a spray type saturator and a working method thereof. The utility model has the advantages of low power consumption, high demisting efficiency and high deammoniation efficiency.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A spray-type saturator comprises a separation chamber and a crystallization chamber, wherein the separation chamber and the crystallization chamber are connected via a downcomer; a reverse spray pipe and an empty spray pipe are arranged at the upper portion of the separation chamber; the upper end of the reverse spray pipe is a gas inlet, and a primary mother liquor nozzle is arranged inside the lower end; the primary mother liquor nozzle is connected to a pipeline, and the pipeline inlet extends out of a side portion of the separation chamber; the upper end of the empty spray pipe is a gas outlet, and a secondary mother liquor nozzle and a demister are arranged in sequence inside the empty spray pipe from bottom to top; the secondary mother liquor nozzle is connected to the pipeline, and the pipeline inlet extends out of a side portion of the empty spray pipe; the primary mother liquor nozzle is a dynamic wave nozzle.

[0008] A manhole, a cleaning liquid inlet and a mother liquid full flow outlet are arranged on the side of the separation chamber.

[0009] The side of the crystallization chamber is provided with a manhole, a mother liquor reflux inlet, a mother liquor heating outlet, a crystallization mother liquor outlet and a mother liquor circulation outlet; the upper part of the crystallization chamber is provided with a cleaning liquid inlet and a venting port; the bottom of the crystallization chamber is provided with a drain port.

[0010] A thermometer interface is provided on the side of the crystallization chamber.

[0011] A cleaning liquid nozzle is arranged inside the empty nozzle, the cleaning liquid nozzle is connected with a pipeline, an inlet of the pipeline extends out of the side of the empty nozzle, and the cleaning liquid nozzle is located above the demister.

[0012] The demister is a baffle type demister or a wire mesh type demister.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1) In the utility model, by adopting a reverse nozzle and a dynamic wave type primary mother liquid nozzle, the coal gas and the primary mother liquid move toward each other in the reverse nozzle and generate a strongly turbulent foam zone. In the foam zone, the contact surface area between the coal gas and the primary mother liquid is large and rapidly renewed, achieving the effect of efficient mass transfer and enabling the primary mother liquid to quickly and efficiently absorb ammonia in the coal gas.

[0015] 2) In the utility model, a demister is provided in the air spray pipe. After the coal gas and the secondary mother liquor are sprayed for the second time to remove ammonia, the coal gas can pass through the demister to remove the mother liquor entrained in the coal gas, thereby improving the demisting effect.

[0016] 3) Compared with the existing spray-type saturator, the utility model adopts reverse nozzle and empty nozzle for spraying ammonia removal, which can reduce the spraying space, reduce the mother liquor circulation spraying volume, and reduce the power consumption; and the small space can increase the relative movement speed of the primary mother liquor, the secondary mother liquor and the coal gas, thereby increasing the impact force, so that the mass transfer effect is good, which is conducive to deammoniation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Description of reference numerals:

[0020] In the figure: 1-separation chamber 2-crystallization chamber 3-downcomer 4-reverse nozzle 5-empty nozzle 6-primary mother liquor nozzle 7-secondary mother liquor nozzle 8-demister 9-manhole 10-cleaning liquid inlet 11-mother liquor full flow outlet 12-mother liquor reflux inlet 13-mother liquor heating outlet 14-crystallization mother liquor outlet 15-mother liquor circulation outlet 16-venting port 17-draining port 18-thermometer interface 19-cleaning liquid nozzle DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0023] As seen Figure 1 As shown, the utility model provides a spray-type saturator, including a separation chamber 1 and a crystallization chamber 2, wherein the separation chamber 1 and the crystallization chamber 2 are connected via a downcomer 3. A reverse spray pipe 4 and an empty spray pipe 5 are provided at the upper portion of the separation chamber 1. The upper end of the reverse spray pipe 4 is a gas inlet, and a primary mother liquid nozzle 6 is provided inside the lower end. The primary mother liquid nozzle 6 is connected to a pipeline, and the pipeline inlet extends out of the side of the separation chamber 1. The upper end of the empty spray pipe 5 is a gas outlet, and a secondary mother liquid nozzle 7 and a demister 8 are provided inside the empty spray pipe 5 from bottom to top. The secondary mother liquid nozzle 7 is connected to a pipeline, and the pipeline inlet extends out of the side of the empty spray pipe 5. The primary mother liquid nozzle 6 is a dynamic wave nozzle.

[0024] The side of the separation chamber 1 is provided with a manhole 9, a cleaning liquid inlet 10 and a mother liquid full flow outlet 11. The side of the crystallization chamber 2 is provided with a manhole 9, a mother liquid reflux inlet 12, a mother liquid heating outlet 13, a crystallization mother liquid outlet 14 and a mother liquid circulation outlet 15. The upper part of the crystallization chamber 2 is provided with a cleaning liquid inlet 10 and a vent 16. The bottom of the crystallization chamber 2 is provided with a drain port 17. The side of the crystallization chamber 2 is provided with a thermometer interface 18.

[0025] A cleaning liquid spray head 19 is provided inside the air spray pipe 5. The cleaning liquid spray head 19 is connected to a pipeline. The pipeline inlet extends out of the side of the air spray pipe 5. The cleaning liquid spray head 19 is located above the demister 8. The demister 8 is a baffle type demister or a wire mesh type demister. When a baffle type demister is used, the baffle type demister can be regularly rinsed with warm water or hot water. If the demister 8 is set outside the spray saturator, the demister 8 can be a centrifugal or electric demister.

[0026] The specific working process of the utility model is as follows:

[0027] (1) The coal gas enters the reverse spray pipe 4 from top to bottom through the coal gas inlet, and the primary mother liquid is sprayed into the reverse spray pipe 4 from bottom to top through the primary mother liquid nozzle 6; the coal gas and the primary mother liquid collide with each other at high speed in the reverse spray pipe 4, and when the two reach momentum equilibrium, a strongly turbulent foam zone will be generated, floating in the coal gas flow; in this foam zone, the coal gas and the primary mother liquid are in high-speed countercurrent contact, the contact surface area is large and quickly renewed, achieving the effect of efficient mass transfer, and realizing that the primary mother liquid quickly absorbs ammonia in the coal gas.

[0028] (2) The coal gas and the primary mother liquor leave the foam zone and flow downward, entering the separation chamber 1 from the bottom of the reverse nozzle 4 for gas-liquid separation; the coal gas first moves downward, and then moves upward to enter the bottom of the empty nozzle 5; the primary mother liquor falls to the bottom of the separation chamber 1 under the action of gravity.

[0029] (3) The coal gas entering the bottom of the empty nozzle 5 is in convection contact with the secondary mother liquid sprayed from the secondary mother liquid nozzle 7 in the empty nozzle 5, so that the secondary mother liquid absorbs the ammonia in the coal gas, further removes the ammonia in the coal gas, and improves the deammoniation efficiency.

[0030] (4) The coal gas after the secondary deammoniation continues to flow upward in the empty nozzle 5, passes through the demister 8, removes the entrained mother liquor, and leaves the spray saturator from the top of the empty nozzle 5; the secondary mother liquor falls to the bottom of the separation chamber 1 under the action of gravity.

[0031] (5) The mixed mother liquor of the primary mother liquor and the secondary mother liquor at the bottom of the separation chamber 1 flows through the downcomer 3 to the crystallization chamber 2 at the bottom of the saturator, and then flows upward from the bottom of the crystallization chamber 2 to stir the mother liquor, so that the ammonium sulfate crystal nuclei are continuously generated and grown, and the particles are classified. A part of the mixed mother liquor at the top of the crystallization chamber 2 flows out through the mother liquor circulation outlet 15 and is sent to the pipeline connected to the primary mother liquor nozzle 6 to circulate and spray the coal gas; a part of it is sent to the mother liquor heater through the mother liquor heating outlet 13 for heating, and then merged into the circulation system to ensure that the temperature of the circulating mother liquor is within the set range.

[0032] The separation chamber 1 is provided with a mother liquor full flow outlet 11 to keep the liquid level at a certain height, seal the coal gas, and prevent the coal gas from entering the crystallization chamber 2. The mixed mother liquor overflowing from the mother liquor full flow outlet 11 overflows to the external liquid seal tank, then flows to the external full flow tank, and is then pumped by a pump to the pipeline connected to the secondary mother liquor nozzle 7 for secondary circulation spraying. The free acid content of the secondary mother liquor is higher than that of the primary mother liquor. The free acid content of the primary mother liquor is 2.5-3%wt, and the free acid content of the secondary mother liquor is 5-6%wt. The fresh concentrated sulfuric acid required for deamination can be continuously added to the inlet or outlet of the external liquid seal tank and mixed with the old mother liquor to ensure that the free acid content of the secondary mother liquor is 5-6%wt.

[0033] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the idea of ​​the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A spray type saturator, characterized in that: It comprises a separation chamber and a crystallization chamber, which are connected via a downcomer; a reverse spray pipe and an empty spray pipe are arranged at the upper part of the separation chamber; the upper end of the reverse spray pipe is a gas inlet, and a primary mother liquid nozzle is arranged inside the lower end; the primary mother liquid nozzle is connected to a pipeline, and the pipeline inlet extends out of the side of the separation chamber; the upper end of the empty spray pipe is a gas outlet, and a secondary mother liquid nozzle and a demister are arranged in sequence from bottom to top inside the empty spray pipe; the secondary mother liquid nozzle is connected to the pipeline, and the pipeline inlet extends out of the side of the empty spray pipe; the primary mother liquid nozzle is a power wave nozzle.

2. A spray type saturator according to claim 1, characterized in that: A manhole, a cleaning liquid inlet and a mother liquid full flow outlet are arranged on the side of the separation chamber.

3. A spray type saturator according to claim 1, characterized in that: The side of the crystallization chamber is provided with a manhole, a mother liquor reflux inlet, a mother liquor heating outlet, a crystallization mother liquor outlet and a mother liquor circulation outlet; the upper part of the crystallization chamber is provided with a cleaning liquid inlet and a venting port; the bottom of the crystallization chamber is provided with a drain port.

4. A spray type saturator according to claim 1, characterized in that: A thermometer interface is provided on the side of the crystallization chamber.

5. A spray type saturator according to claim 1, characterized in that: A cleaning liquid nozzle is arranged inside the empty nozzle, the cleaning liquid nozzle is connected with a pipeline, an inlet of the pipeline extends out of the side of the empty nozzle, and the cleaning liquid nozzle is located above the demister.

6. A spray type saturator according to claim 5, characterized in that: The demister is a baffle type demister or a wire mesh type demister.

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