Oxygen-enriched combustion system in dry-method acid making process

Abstract

The utility model relates to the technical field of sulfur burning, in particular to an oxygen-enriched combustion system in a dry-method acid making process, which comprises a blast channel communicated with one side of the bottom of a sulfur burning furnace and an oxygen-enriched channel communicated with the blast channel, and a low-position air inlet pipeline communicated with the blast channel is arranged on one side of the bottom of the sulfur burning furnace. The air blowing channel comprises an air conveying pipeline connected with the low-position air inlet pipeline, a primary air blower is arranged on the air conveying pipeline, and a secondary air blower located between the low-position air inlet pipeline and the primary air blower is further arranged on the air conveying pipeline. The oxygen-enriched channel comprises an oxygen-enriched pipeline, a manual stop valve is arranged on the oxygen-enriched pipeline, and safety interlocking assemblies are arranged on the air conveying pipeline and the oxygen-enriched pipeline in a matched mode. According to the sulfur burning furnace, the burning speed in the sulfur burning furnace is increased, ammonium salt substances and solid blocks which are difficult to burn are fully burnt, and the problems of poor safety, environmental protection and field operation environment caused by incomplete burning in the furnace are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sulfur burning, in particular to an oxygen-enriched combustion system in a dry acid making process. Background Art

[0002] The main purpose of the coking plant desulfurization waste liquid acid production process is to treat the desulfurization liquid and sulfur foam produced in the coking desulfurization process, and at the same time, comprehensively utilize the sulfur resources in it to convert it into sulfuric acid, so as to realize the resource utilization of waste. Since the desulfurization liquid contains a large amount of ammonium salt substances, the composition is complex and it is also highly corrosive, the treatment of waste liquid has become a major problem that troubles many coking enterprises. The sulfur foam produced in the desulfurization process also contains a large amount of salt impurities and is not of high purity, which seriously affects the comprehensive utilization of sulfur foam.

[0003] The dry acid production process of desulfurization waste liquid is to make solid sulfur powder by concentrating, filtering, drying and other methods of sulfur foam, and then use the common sulfur acid production process to burn-two-turn-two-absorption process to produce acid. However, since the recovered sulfur contains more or less impurities such as ammonium salts, and the produced sulfur powder contains hard lumps. Therefore, due to the presence of a large number of difficult-to-burn ammonium salts and a large number of hard lumps of different sizes in the sulfur powder, the combustion is unstable and the efficiency is low when the sulfur is burned by the sulfur incinerator. A large number of unburned ammonium salt impurities and solid lumps melt in the high temperature environment of the furnace and flow out of the furnace bottom in liquid form, emitting a strong stench, which needs to be cleaned up manually regularly. In addition, a large number of salt crystals are produced in the subsequent waste heat boiler system and adhere to the tube wall to corrode the boiler tube. The sulfuric acid product produced may appear red due to the dissolution of nitrogen oxides. Due to the existence of this problem, a large amount of waste liquid discharged from the desulfurization system of the previous process cannot be treated, which directly has a very adverse impact on the production process of the previous desulfurization process. It also seriously affects the environmental protection site, product quality and production continuity and stability of the acid production process. Utility Model Content

[0004] The utility model provides an oxygen-enriched combustion system in a dry acid-making process to solve the technical problems of unstable combustion, low efficiency and incomplete combustion in a sulfur incinerator during sulfur burning in the prior art, such as safety, environmental protection and poor on-site operating environment.

[0005] In order to solve the above problems, the utility model provides an oxygen-enriched combustion system in a dry acid production process, which adopts the following technical solutions:

[0006] It comprises an air blast channel connected to one side of the bottom of the sulfur incinerator and an oxygen-enriched channel connected to the air blast channel. One side of the bottom of the sulfur incinerator is provided with a low-position air inlet duct connected to the air blast channel.

[0007] The blast air passage includes an air delivery pipe connected to the low-position air inlet pipe. An primary air blower is provided on the air delivery pipe, and a secondary air blower is also provided on the air delivery pipe between the low-position air inlet pipe and the primary air blower.

[0008] The oxygen-enriched passage includes an oxygen-enriched pipe connected to the air delivery pipe and between the secondary air blower and the low-position air inlet pipe. A manual cut-off valve is provided on the oxygen-enriched pipe, and a safety interlock assembly is cooperatively provided on the air delivery pipe and the oxygen-enriched pipe.

[0009] Further, the safety interlock assembly includes an oxygen content monitor provided on the air delivery pipe between the oxygen-enriched pipe and the low-position air inlet pipe. An automatic regulating valve and an electric quick cut-off valve interlocked with the oxygen content monitor are provided on the oxygen-enriched pipe.

[0010] Further, the electric quick cut-off valve is provided on the side of the manual cut-off valve close to the air delivery pipe, and the automatic regulating valve is provided between the electric quick cut-off valve and the manual cut-off valve.

[0011] Further, a high-position air inlet pipe above the low-position air inlet pipe is provided on one side of the sulfur-burning furnace. The high-position air inlet pipe is communicated with the primary air blower.

[0012] Further, the high-position air inlet pipes are multiple and vertically spaced apart. The spacing between the low-position air inlet pipe and the adjacent high-position air inlet pipe and the spacing between adjacent two high-position air inlet pipes are equal.

[0013] Further, a feed hopper is provided on one side of the sulfur-burning furnace. The feed hopper is above the topmost high-position air inlet pipe. A flap valve is provided on the feed hopper. Both the feed hopper and the flap valve are communicated with the primary air blower.

[0014] Further, the pressure at the outlet of the primary air blower is less than the pressure at the outlet of the secondary air blower.

[0015] The beneficial effects of an oxygen-enriched combustion system in a dry-process sulfuric acid process provided by the present utility model are as follows: By cooperating the blast air passage with the oxygen-enriched passage, the oxygen content of the air supplied to the sulfur-burning furnace is increased from 21% of the oxygen content in the air to 27% - 30%. By increasing the oxygen content of the supplied air, the combustion speed is greatly improved, and the rapid combustion of salts and solid lumps that are difficult to burn is realized, solving the problems of safety, environmental protection, and poor on-site operation environment caused by incomplete combustion in the furnace. In addition, an upper and lower stratified air supply system is formed by the high and low positions, which helps to form a more uniform air flow distribution in the sulfur-burning furnace, thereby reducing local high-temperature or low-temperature regions and improving the combustion efficiency. Description of the Drawings

[0016] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understandable. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, where:

[0017] Figure 1 It is a schematic diagram of an oxygen-enriched combustion system in the dry acid-making process of the present utility model;

[0018] Figure 2 is Figure 1 a partial enlarged view of the shown area A;

[0019] Figure 3 It is a schematic diagram of a safety interlock assembly in the present utility model.

[0020] Explanation of reference numerals:

[0021] 1, sulfur-burning furnace; 11, low-position air inlet pipe; 12, high-position air inlet pipe; 13, feed hopper; 131, slide valve; 2, air-blowing channel; 21, air delivery pipe; 22, primary air blower; 23, secondary air blower; 3, oxygen-enriched channel; 31, oxygen-enriched pipe; 311, manual cut-off valve; 32, safety interlock assembly; 321, oxygen content monitoring meter; 322, automatic regulating valve; 323, electric quick cut-off valve. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Those skilled in the art should know that the following described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present utility model.

[0023] The quantity of any element in the drawings is for illustration rather than limitation, and any naming is only for distinction and does not have any limiting meaning.

[0024] Next, with reference to several representative embodiments of the present utility model, the principles and spirits of the present utility model will be elaborated in detail.

[0025] An embodiment of an oxygen-enriched combustion system in the dry acid-making process provided by the present utility model:

[0026] As Figures 1 to 3 shown, it includes an air-blowing channel 2 connected to one side of the bottom of the sulfur-burning furnace 1 and an oxygen-enriched channel 3 connected to the air-blowing channel 2. A low-position air inlet pipe 11 connected to the air-blowing channel 2 is provided on one side of the bottom of the sulfur-burning furnace 1.

[0027] The blast air passage 2 includes an air delivery pipe 21 connected to the low-level air inlet pipe 11. An primary air blower 22 is provided on the air delivery pipe 21, and a secondary air blower 23 is also provided on the air delivery pipe 21 between the low-level air inlet pipe 11 and the primary air blower 22.

[0028] The pressure at the outlet of the primary air blower 22 is less than the pressure at the outlet of the secondary air blower 23. In this embodiment, the pressure at the outlet of the primary air blower 22 is 0.33 KPa, and the pressure at the outlet of the secondary air blower 23 is 2.12 KPa.

[0029] By connecting the primary air blower 22 and the secondary air blower 23 in series, the air flow disturbance in the sulfur-burning furnace 1 can be further enhanced, promoting the full combustion of the fuel and improving the combustion efficiency.

[0030] In this embodiment, a high-level air inlet pipe 12 is further provided on one side of the sulfur-burning furnace 1 above the low-level air inlet pipe 11, and the high-level air inlet pipe 12 is communicated with the primary air blower 22.

[0031] Among them, there are three high-level air inlet pipes 12 vertically spaced apart. The distance between the low-level air inlet pipe 11 and the adjacent high-level air inlet pipe 12 and the distance between two adjacent high-level air inlet pipes 12 are equal.

[0032] Specifically, the combination of the high-level air inlet pipe 12 and the low-level air inlet pipe 11 forms an upper and lower stratified air supply system. This design helps to form a more uniform air flow distribution in the sulfur-burning furnace 1, thereby reducing local high-temperature or low-temperature areas and improving the combustion efficiency.

[0033] In addition, the three vertically spaced high-level air inlet pipes 12 can ensure that air enters the furnace from different heights, further promoting the full combustion of the fuel.

[0034] Among them, a feed hopper 13 is provided on one side of the sulfur-burning furnace 1 above the uppermost high-level air inlet pipe 12. A slide valve 131 is provided on the feed hopper 13, and both the feed hopper 13 and the slide valve 131 are communicated with the primary air blower 22.

[0035] During feeding, introducing an appropriate amount of air helps to quickly preheat and preliminarily burn the fuel.

[0036] In this embodiment, the oxygen-enriched passage 3 includes an oxygen-enriched pipe 31 connected to the air delivery pipe 21 and between the secondary air blower 23 and the low-level air inlet pipe 11. A manual cut-off valve 311 is provided on the oxygen-enriched pipe 31, and a safety interlock assembly 32 is provided on the air delivery pipe 21 and the oxygen-enriched pipe 31 in cooperation.

[0037] Among them, the safety interlock component 32 includes an oxygen content monitoring meter 321 disposed on the air supply pipeline 21 and between the oxygen-enriched pipeline 31 and the low-position air inlet pipeline 11. An automatic regulating valve 322 and an electric quick cut-off valve 323 which are interlocked with the oxygen content monitoring meter 321 are disposed on the oxygen-enriched pipeline 31.

[0038] Among them, the electric quick cut-off valve 323 is disposed on one side of the manual cut-off valve 311 close to the air supply pipeline 21, and the automatic regulating valve 322 is disposed between the electric quick cut-off valve 323 and the manual cut-off valve 311.

[0039] Through the cooperative action of the oxygen content monitoring meter 321 and the automatic regulating valve 322, the oxygen content at the oxygen content monitoring meter 321 is controlled to be 27%-30%. When the oxygen content monitoring meter 321 detects that the oxygen content is too high, the oxygen-enriched pipeline is quickly cut off by cooperating with the electric quick cut-off valve 323. At the same time, the oxygen content monitoring meter 321 emits an alarm signal, and the alarm signal reminds the operator to take corresponding measures, thereby avoiding potential safety accidents caused by too high oxygen content.

[0040] Among them, the oxygen content of the gas in the oxygen-enriched pipeline 31 is 30%-40%. The oxygen content of the air supply to the sulfur-burning furnace 1 is increased from 21% of the oxygen content in the air to 27% - 30%. By increasing the oxygen content of the air supply, the combustion speed is greatly improved, and the rapid combustion of salts and solid lumps that are difficult to burn is realized, solving the problems of safety, environmental protection and poor on-site operation environment caused by incomplete combustion in the furnace.

[0041] According to the above description of this specification, those skilled in the art can also understand the following terms used. For example, terms indicating orientation or position relationship such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or position relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in the specific orientation. Therefore, the above orientation or position relationship terms cannot be understood or interpreted as a limitation to the solution of the present invention.

[0042] In addition, in the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically and clearly defined.

Claims

1. An oxygen-enriched combustion system in a dry acid production process, characterized in that: It comprises an air blast channel (2) connected to one side of the bottom of the sulfur incinerator (1) and an oxygen-enriched channel (3) connected to the air blast channel (2); one side of the bottom of the sulfur incinerator (1) is provided with a low-position air inlet duct (11) connected to the air blast channel (2); The air blast channel (2) comprises an air delivery duct (21) connected to the low-position air inlet duct (11), a primary air blower (22) being provided on the air delivery duct (21), and a secondary air blower (23) being provided on the air delivery duct (21) and being located between the low-position air inlet duct (11) and the primary air blower (22); The oxygen-enriched passage (3) comprises an oxygen-enriched pipeline (31) connected to the air delivery pipeline (21) and located between the secondary air blower (23) and the low-position air inlet pipeline (11); a manual shut-off valve (311) is provided on the oxygen-enriched pipeline (31); and a safety interlocking assembly (32) is provided on the air delivery pipeline (21) and the oxygen-enriched pipeline (31).

2. The oxygen-enriched combustion system in the dry acid production process according to claim 1, characterized in that: The safety interlock assembly (32) comprises an oxygen-enriched content monitoring meter (321) disposed on the air delivery pipeline (21) and located between the oxygen-enriched pipeline (31) and the low-position air inlet pipeline (11); the oxygen-enriched pipeline (31) is provided with an automatic regulating valve (322) and an electric quick shut-off valve (323) interlocked with the oxygen-enriched content monitoring meter (321).

3. The oxygen-enriched combustion system in the dry acid production process according to claim 2, characterized in that: The electric quick shut-off valve (323) is arranged on a side of the manual shut-off valve (311) close to the air delivery pipeline (21), and the automatic regulating valve (322) is arranged between the electric quick shut-off valve (323) and the manual shut-off valve (311).

4. The oxygen-enriched combustion system in the dry acid production process according to claim 1, characterized in that: A high-position air inlet duct (12) located above the low-position air inlet duct (11) is also provided on one side of the sulfur incinerator (1), and the high-position air inlet duct (12) is connected to the primary air blower (22).

5. The oxygen-enriched combustion system in the dry acid production process according to claim 4, characterized in that: The high-position air inlet ducts (12) are multiple and distributed at intervals in a vertical direction, and the spacing between a low-position air inlet duct (11) and an adjacent high-position air inlet duct (12) and the spacing between two adjacent high-position air inlet ducts (12) are equal.

6. The oxygen-enriched combustion system in the dry acid production process according to claim 4, characterized in that: A feed hopper (13) is provided on one side of the sulfur incinerator (1). The feed hopper (13) is located above the uppermost high-level air inlet duct (12). A gate valve (131) is provided on the feed hopper (13). Both the feed hopper (13) and the gate valve (131) are connected to a primary air blower (22).

7. The oxygen-enriched combustion system in the dry acid production process according to claim 1, characterized in that: The pressure at the air outlet of the primary air blower (22) is lower than the pressure at the air outlet of the secondary air blower (23).

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