Desulfurization system

Abstract

The utility model discloses a desulfurization system, barren liquor in a desulfurization tower absorbs sulfur-containing gas and then is converted into desulfurization rich liquor, the desulfurization rich liquor flows out of a desulfurization rich liquor outlet of the desulfurization tower and enters a rich liquor tank, an alkali liquor supply port of an alkali liquor container is communicated with a receiving port of the rich liquor tank, and alkali liquor in the alkali liquor container enters the rich liquor tank and reacts with the desulfurization rich liquor to form barren liquor; and the barren liquor sequentially passes through the desorption tower, the barren liquor pump and the desulfurization tower. An input port in the barren liquor pump is communicated with a discharge port of the desorption tower and an alkali liquor supply port, alkali liquor enters the barren liquor pump to react, the conveying path is short, barren liquor can be rapidly conveyed to the desulfurization tower after reaching the standard, the desulfurization efficiency is improved, the alkali liquor directly enters the barren liquor pump, and the concentration of potassium carbonate or sodium carbonate in the barren liquor pump can be increased; the sulfur content possibly existing in the barren liquor pump is reduced, the quality of barren liquor can also be improved, the absorption effect on sulfur-containing gas can also be improved when the barren liquor with high quality enters the desulfurization tower, and the desulfurization effect on coke oven gas is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coke oven gas desulfurization system, and particularly relates to a desulfurization system. BACKGROUND

[0002] Coke oven gas is a byproduct of coking industry, which can be used as industrial raw material or fuel gas. However, coke oven gas may carry harmful gases such as hydrogen sulfide during preparation process, and it is necessary to remove hydrogen sulfide and other harmful gases from coke oven gas.

[0003] At present, the sulfur-containing harmful gas in coke oven gas is absorbed by lean liquid in a desulfurization tower. After the lean liquid in the desulfurization tower absorbs the sulfur-containing gas, the desulfurization rich liquid is converted into the desulfurization rich liquid through the internal process of the desulfurization tower. The desulfurization rich liquid is mixed with alkali liquor and regenerated to form lean liquid through a stripping tower and other devices. The lean liquid reenters the desulfurization tower for recycling. In this coke oven gas treatment process, the desulfurization rich liquid regeneration to form lean liquid has a long cycle, and the quality of the final lean liquid is not good enough, which may affect the desulfurization efficiency and effect of coke oven gas. CONTENT OF THE INVENTION

[0004] The application aims to at least solve the technical problem that the desulfurization efficiency and effect of coke oven gas are affected to some extent. To this end, the application provides a desulfurization system.

[0005] The application provides a desulfurization system, which comprises:

[0006] The desulfurization tower is provided with a lean liquid inlet and a desulfurization rich liquid outlet which are spaced apart.

[0007] The alkali liquor container is provided with an alkali liquor supply port.

[0008] The rich liquid tank is provided with a first inlet, a receiving port and an outlet which are spaced apart. The first inlet is in communication with the desulfurization rich liquid outlet. The receiving port is in communication with the alkali liquor supply port.

[0009] The stripping tower is provided with a stripping inlet in communication with the outlet, and a discharge port spaced apart from the stripping inlet.

[0010] The lean liquid pump is provided with a chamber for containing liquid, an input port and an output port which are spaced apart and communicated to the chamber. The input port is in communication with the alkali liquor supply port and the discharge port. The output port is in communication with the lean liquid inlet.

[0011] In some or certain embodiments, the desulfurization system comprises at least two lean liquid pumps. The input port of each lean liquid pump is in communication with the alkali liquor supply port and the discharge port. The output port of each lean liquid pump is in communication with the lean liquid inlet.

[0012] In some or certain embodiments, the desulfurization system further comprises:

[0013] A reversing valve is disposed between the alkali supply port and the at least two input ports, and is used to control the medium flowing out of the alkali supply port to enter different input ports.

[0014] In some or certain embodiments, the lean liquid pump is a centrifugal pump.

[0015] In some or certain embodiments, the desulfurization system further comprises:

[0016] An alkali pump, an input end of the alkali pump is communicated with the alkali supply port, and an output end of the alkali pump is communicated with the first inlet and the input end of the lean liquid pump.

[0017] In some or certain embodiments, the desulfurization system further comprises:

[0018] A control valve is disposed between the input end and the alkali supply port, and is used to control the on-off of the input end and the alkali supply port.

[0019] In some or certain embodiments, the desulfurization system further comprises:

[0020] A flow meter is disposed between the input end and the alkali supply port, and is used to measure the flow of the medium flowing into the input end.

[0021] In some or certain embodiments, the desulfurization system further comprises:

[0022] A rich liquid pump is communicated between the flow outlet and the desorption inlet.

[0023] In some or certain embodiments, the rich liquid tank is provided with a second inlet spaced from the first inlet, and the desulfurization system further comprises:

[0024] A buffer container is provided with a buffer inlet communicated with the desulfurization rich liquid outlet, and a buffer outlet spaced from the buffer inlet and communicated with the second inlet.

[0025] In some or certain embodiments, the desulfurization system further comprises:

[0026] A delivery pump is communicated between the buffer outlet and the second inlet.

[0027] The beneficial effects provided according to one or more embodiments of the present application are:

[0028] The lean liquid in the desulfurization tower absorbs the sulfur-containing gas and is converted into desulfurization rich liquid, which flows out of the desulfurization rich liquid outlet of the desulfurization tower, enters the rich liquid tank through the first inlet of the rich liquid tank, and the alkali liquid supply port of the alkali liquid container is communicated with the receiving port of the rich liquid tank. The alkali liquid in the alkali liquid container can react with the desulfurization rich liquid in the rich liquid tank to form a potassium carbonate or sodium carbonate solution, which enters the analysis tower through the outlet of the rich liquid tank and the analysis inlet of the analysis tower for treatment in the analysis tower. The lean liquid obtained after treatment in the analysis tower enters the lean liquid pump through the discharge port of the analysis tower. The lean liquid pump sends the lean liquid to the lean liquid inlet of the desulfurization tower for absorption treatment of the sulfur-containing gas. The lean liquid pump is provided with a chamber for containing liquid, an input port and an output port spaced apart and communicated to the chamber. In addition to the discharge port of the analysis tower, the input port is also communicated with the alkali liquid supply port, so that the alkali liquid in the alkali liquid container can directly react in the lean liquid pump, the reaction efficiency is high, and the quality of the lean liquid in the lean liquid pump can quickly reach the standard under the addition of the alkali liquid, realizing the rapid delivery of the lean liquid to the desulfurization tower, which is beneficial to improve the desulfurization efficiency. The alkali liquid directly enters the lean liquid pump and can be mixed and reacted with the original lean liquid in the chamber of the lean liquid pump, thereby increasing the concentration of potassium carbonate or sodium carbonate in the lean liquid pump, increasing the proportion of alkali liquid in the lean liquid, and reducing the sulfur content in the lean liquid entering the desulfurization tower under the condition that the flow rate of the lean liquid entering the desulfurization tower is constant. The quality of the lean liquid can also be improved, and the absorption effect of the sulfur-containing gas in the desulfurization tower can also be improved to improve the desulfurization effect of the coke oven gas. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0030] Figure 1 The structure of a desulfurization system in some embodiments or certain embodiments of the present application is shown.

[0031] Figure 2 The structure of a desulfurization system in some embodiments or certain embodiments of the present application is shown.

[0032] Figure 3 The structure of a desulfurization system in some embodiments or certain embodiments of the present application is shown. Figure 2 The structure of a desulfurization system in some embodiments or certain embodiments of the present application is shown.

[0033] Figure 4 The structure of a desulfurization system in some embodiments or certain embodiments of the present application is shown. Figure 2 The structure of a desulfurization system in some embodiments or certain embodiments of the present application is shown.

[0034] Explanation of reference signs: 1, desulfurization tower; 101, lean liquid inlet; 102, desulfurization rich liquid outlet; 2, alkali liquid container; 201, alkali liquid supply port; 3, rich liquid tank; 301, first inlet; 302, receiving port; 303, flow outlet; 304, second inlet; 4, stripping tower; 401, stripping inlet; 402, discharge port; 5, lean liquid pump; 501, input port; 502, output port; 6, reversing valve; 7, alkali liquid pump; 701, input end; 702, output end; 8, control valve; 9, flow meter; 10, rich liquid pump; 11, buffer container; 1101, buffer inlet; 1102, buffer outlet; 12, delivery pump. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative positional relationship, movement condition and the like between components in a certain specific posture, and if the specific posture changes, the directional indications also change accordingly.

[0037] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0039] In the related art, the sulfur-containing harmful gas in the coke oven gas is absorbed by the lean liquid in the desulfurization tower, the desulfurization rich liquid is formed after the sulfur-containing gas is absorbed by the lean liquid in the desulfurization tower, the desulfurization rich liquid is mixed with the alkali liquid in the rich liquid tank, and then flows through the stripping tower, and finally is regenerated in the lean liquid tank to form the lean liquid. The process of regenerating the lean liquid from the desulfurization rich liquid is relatively long, which affects the regeneration efficiency of the lean liquid, and affects the efficiency of the lean liquid entering the desulfurization tower to absorb the sulfur-containing gas in the coke oven gas, thereby affecting the desulfurization efficiency of the coke oven gas. In addition, the desulfurization rich liquid mixed with the alkali liquid may be slightly absorbed by the sulfur-containing gas when passing through the stripping tower, and the mixing of the solution flowing out of the stripping tower in the lean liquid tank may also not be sufficient enough, which may result in that the quality of the obtained lean liquid is not good enough. The poor quality of the lean liquid also affects the desulfurization effect of the coke oven gas in the desulfurization tower, and there is a technical problem that the desulfurization efficiency and effect of the coke oven gas are not good enough. The embodiments of the present application provide a desulfurization system which can at least solve the above technical problems to some extent.

[0040] The present application will be described below with reference to the accompanying drawings:

[0041] Figure 1 The structure of a desulfurization system in some embodiments or certain embodiments of the present application is shown, Figure 2 The partial structure of a desulfurization system in some embodiments or certain embodiments of the present application is shown, with reference to Figure 1 、 2 The embodiments of the present application provide a desulfurization system, which comprises:

[0042] The desulfurization tower 1 is provided with a lean liquid inlet 101 and a desulfurization rich liquid outlet 102 which are spaced apart.

[0043] The alkali liquid container 2 is provided with an alkali liquid supply port 201.

[0044] The rich liquid tank 3 is provided with a first inlet 301, a receiving port 302 and a flow port 303 which are spaced apart from each other, the first inlet 301 is in communication with the desulfurization rich liquid outlet 102, and the receiving port 302 is in communication with the alkali liquid supply port 201.

[0045] The stripping tower 4 is provided with a stripping inlet 401 in communication with the flow port 303, and a discharge port 402 spaced apart from the stripping inlet 401.

[0046] The lean liquid pump 5 is provided with a chamber (not shown in the figure) for containing liquid, an input port 501 and an output port 502 which are spaced apart and communicated to the chamber, the input port 501 is in communication with the alkali liquid supply port 201 and the discharge port 402, and the output port 502 is in communication with the lean liquid inlet 101.

[0047] The lean liquid in the desulfurization tower 1 absorbs the sulfur-containing gas and is converted into desulfurization rich liquid, which flows out of the desulfurization rich liquid outlet 102 of the desulfurization tower 1, enters the rich liquid tank 3 from the first inlet 301 of the rich liquid tank 3, the alkali liquid supply port 201 of the alkali liquid container 2 is communicated with the receiving port 302 of the rich liquid tank 3, and the alkali liquid in the alkali liquid container 2 can enter the rich liquid tank 3 to react with the desulfurization rich liquid to form a potassium carbonate or sodium carbonate solution. The potassium carbonate or sodium carbonate solution enters the stripping inlet 401 of the stripping tower 4 from the flow outlet 303 of the rich liquid tank 3 to enter the stripping tower 4 for treatment. The lean liquid obtained after being treated in the stripping tower 4 enters the lean liquid pump 5 from the discharge outlet 402 of the stripping tower 4. The lean liquid pump 5 sends the lean liquid to the lean liquid inlet 101 of the desulfurization tower 1 for absorption treatment. The lean liquid pump 5 is provided with a chamber for containing liquid and an input port 501 and an output port 502 spaced apart and communicated to the chamber. In addition to the discharge outlet 402 of the stripping tower 4, the input port 501 is also communicated with the alkali liquid supply port 201, so that the alkali liquid in the alkali liquid container 2 can directly enter the lean liquid pump 5 for reaction, the conveying path is short and the reaction efficiency is high. The quality of the lean liquid in the lean liquid pump 5 can quickly reach the standard under the addition of alkali liquid to realize the rapid conveying of the lean liquid to the desulfurization tower 1, which is beneficial to improve the desulfurization efficiency. Moreover, the alkali liquid directly enters the lean liquid pump 5 and can be mixed and reacted with the original lean liquid in the chamber of the lean liquid pump 5, thereby improving the concentration of potassium carbonate or sodium carbonate in the lean liquid pump 5, increasing the proportion of alkali liquid in the lean liquid, and under the condition that the flow rate of the lean liquid entering the desulfurization tower 1 is constant, the sulfur content in the lean liquid entering the desulfurization tower 1 can be diluted and reduced by the alkali liquid, which can also improve the quality of the lean liquid. The lean liquid with high quality entering the desulfurization tower 1 can also improve the absorption effect of the sulfur-containing gas, thereby improving the desulfurization effect of the coke oven gas.

[0048] It should be noted that the lean liquid is a mixed solution mainly composed of sodium carbonate or potassium carbonate. In this application, the communication between different devices or openings can be achieved by pipes, pipe joints and valve structures provided on the pipes.

[0049] Figure 3 The structure of the alkali liquid pump is shown in Figure 2 The structure of the lean liquid pump is shown in Figure 3 In some or certain embodiments, the alkali liquid container 2 can be a tank containing potassium hydroxide or a tank containing sodium hydroxide.

[0050] Figure 4 The structure of the alkali liquid pump is shown in Figure 2 The structure of the lean liquid pump is shown in Figure 4 In some or certain embodiments, the desulfurization system includes at least two lean liquid pumps 5, the input port 501 of each lean liquid pump 5 is communicated with the alkali liquid supply port 201 and the discharge outlet 402, and the output port 502 of each lean liquid pump 5 is communicated with the lean liquid inlet 101.

[0051] The desulfurization system is provided with at least two lean liquid pumps 5, which can increase the upper limit of the lean liquid output to the desulfurization tower 1, and can also improve the fault tolerance of the desulfurization system, and can ensure the stable desulfurization of the coke oven gas.

[0052] In some or certain embodiments, the desulfurization system further comprises:

[0053] The reversing valve 6 is arranged between the alkali liquid supply port 201 and the at least two input ports 501, and is used to control the medium flowing out of the alkali liquid supply port 201 to enter different input ports 501.

[0054] The reversing valve 6 is arranged between the alkali liquid supply port 201 and the input ports 501 of the at least two lean liquid pumps 5, which can control the medium flowing out of the alkali liquid supply port 201 to flow to the input ports 501 of different lean liquid pumps 5, and is beneficial to improve the emergency of the desulfurization system, and is also convenient for adjusting the flow direction of the alkali liquid to adapt to different working conditions.

[0055] It should be noted that the medium involved in the present application can be lean liquid or desulfurization rich liquid or alkali liquid, and the medium flowing out of different devices can be different. The reversing valve 6 and the alkali liquid supply port 201 of the alkali liquid container 2 or the input port 501 of the lean liquid pump 5 can be communicated through a corresponding pipeline. For example, the reversing valve 6 can have one input valve port and two different output valve ports, the input valve port can be communicated with the alkali liquid supply port 201, and the two output valve ports can be communicated with the input ports 501 of the two different lean liquid pumps 5.

[0056] In some or certain embodiments, the lean liquid pump 5 is a centrifugal pump. The alkali liquid or lean liquid entering the lean liquid pump 5 is stirred and mixed by the impeller, which improves the mixing effect of the lean liquid and the alkali liquid and improves the quality of the lean liquid entering the desulfurization tower 1.

[0057] In some or certain embodiments, the desulfurization system further comprises:

[0058] The alkali liquid pump 7 is arranged between the input end 701 and the alkali liquid supply port 201, and is used to control the input end 701 and the alkali liquid supply port 201.

[0059] The addition of the alkali liquid pump 7 can facilitate the pumping of the alkali liquid in the alkali liquid container 2 from the alkali liquid supply port 201 to the rich liquid tank 3 or the lean liquid pump 5, and improve the pumping efficiency of the alkali liquid.

[0060] In some or certain embodiments, the desulfurization system further comprises:

[0061] The control valve 8 is arranged between the input end 701 and the alkali liquid supply port 201 and is used to control the on-off of the input end 701 and the alkali liquid supply port 201.

[0062] The control valve 8 can control the connection and disconnection between the alkali container 2 and the alkali pump 7, so as to control the delivery of the alkali.

[0063] In some or certain embodiments, the control valve 8 can be a mechanical valve or an electromagnetic valve, etc. All of them can realize the connection and disconnection between the alkali container 2 and the alkali pump 7.

[0064] In some or certain embodiments, the control valve 8 can be arranged between the alkali pump 7 and the rich liquid tank 3, between the alkali pump 7 and different lean liquid pumps 5, and between the lean liquid pump 5 and the desulfurization tower 1. This is conducive to improving the stable delivery of the desulfurization system.

[0065] In some or certain embodiments, the desulfurization system further comprises:

[0066] The flow meter 9 is arranged between the input end 701 and the alkali supply port 201 and is used to measure the flow of the medium flowing into the input end 701.

[0067] The flow meter 9 can control the flow of the medium entering the alkali pump 7, so as to monitor the delivery of the alkali.

[0068] In some or certain embodiments, the design range of the flow meter 9 can be 0-2m 3 / h. The use effect is better.

[0069] In some or certain embodiments, the desulfurization system further comprises:

[0070] The rich liquid pump 10 is connected between the flow outlet 303 and the analysis inlet 401.

[0071] The rich liquid pump 10 can facilitate the delivery of the lean liquid in the rich liquid tank 3 to the analysis tower 4, so as to speed up the reaction efficiency.

[0072] In some or certain embodiments, the rich liquid tank 3 is provided with a second inlet 304 spaced from the first inlet 301, and the desulfurization system further comprises:

[0073] The buffer container 11 is provided with a buffer inlet 1101 connected with the desulfurization rich liquid outlet 102, and a buffer outlet 1102 spaced from the buffer inlet 1101 and connected with the second inlet 304.

[0074] The buffer container 11 can store the desulfurization rich liquid, control the flow of the desulfurization rich liquid entering the rich liquid tank 3 from the desulfurization tower 1, control the capacity of the lean liquid obtained by subsequent mixing, and improve the flexibility of the desulfurization system.

[0075] In some or certain embodiments, the desulfurization system further comprises:

[0076] The delivery pump 12 is connected between the buffer outlet 1102 and the second inlet 304.

[0077] The delivery pump 12 can deliver the desulfurization rich solution in the buffer container 11 to the rich solution tank 3, cooperate with the alkali solution container 2 to adjust the ratio of the desulfurization rich solution and the alkali solution in the rich solution tank 3, realize the rapid mixing of the two to form the lean solution.

[0078] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0079] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not within the scope of protection required by the present application.

[0080] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, the scope of the present application is defined by the claims and their equivalents.

Claims

1. A desulfurization system characterized by, The desulfurization system comprises: a desulfurization tower provided with a lean liquid inlet and a desulfurization rich liquid outlet; a lye container provided with a lye supply port; a rich liquid tank provided with a first inlet, a receiving port and a flow outlet, the first inlet being communicated with the desulfurization rich liquid outlet, the receiving port being communicated with the lye supply port; a stripping tower provided with a stripping inlet communicated with the flow outlet, and a discharge outlet spaced from the stripping inlet; a lean liquid pump provided with a chamber for containing liquid, an input port and an output port spaced from the chamber, the input port being communicated with the lye supply port and the discharge outlet, the output port being communicated with the lean liquid inlet.

2. The desulfurization system according to claim 1, characterized by, The desulfurization system comprises at least two lean liquid pumps, the input port of each lean liquid pump being communicated with the lye supply port and the discharge outlet, and the output port of each lean liquid pump being communicated with the lean liquid inlet.

3. The desulfurization system of claim 2, wherein, The desulfurization system further comprises: a reversing valve arranged between the lye supply port and the input ports, and used for controlling the medium flowing out of the lye supply port to enter different input ports.

4. The desulphurisation system according to any one of claims 1 to 3, characterised in that, The lean liquid pump is a centrifugal pump.

5. The desulphurisation system according to any one of claims 1 to 3, characterised in that, The desulfurization system further comprises: a lye pump, the input end of the lye pump being communicated with the lye supply port, and the output end of the lye pump being communicated with the first inlet and the input port of the lean liquid pump.

6. The desulfurization system according to claim 5, wherein The desulfurization system further comprises: a control valve arranged between the input end and the lye supply port, and used for controlling the opening and closing of the input end and the lye supply port.

7. The desulfurization system according to claim 5, wherein The desulfurization system further comprises: a flow meter arranged between the input end and the lye supply port, and used for measuring the flow of the medium flowing into the input end.

8. The desulphurisation system according to any one of claims 1 to 3, characterised in that, The desulfurization system further comprises: a rich liquid pump communicated with the flow outlet and the stripping inlet.

9. The desulphurisation system according to any one of claims 1 to 3, characterised in that, The rich liquid tank is provided with a second inlet spaced from the first inlet, and the desulfurization system further comprises: a buffer container provided with a buffer inlet communicated with the desulfurization rich liquid outlet, and a buffer outlet spaced from the buffer inlet and communicated with the second inlet.

10. The desulfurization system according to claim 9, characterized by, The desulfurization system further comprises: a delivery pump communicated with the buffer outlet and the second inlet.

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