Ammonia-containing non-condensable gas delivery sulfur recovery acid making equipment

Abstract

The utility model relates to the technical field of waste gas treatment, in particular to ammonia-containing non-condensable gas delivery sulfur recovery acid making equipment, which comprises a controllable heat transfer conversion furnace, the bottom of the controllable heat transfer conversion furnace is communicated with a gas delivery pipe, and the top of the controllable heat transfer conversion furnace is communicated with a first flow guide pipe. One end, far away from the controllable heat transfer shift converter, of the first flow guide pipe is communicated with a non-condensable gas stripping separator, the top of the non-condensable gas stripping separator is communicated with a second flow guide pipe, and one end, far away from the non-condensable gas stripping separator, of the second flow guide pipe is communicated with a sulfuric acid steam condenser. Under the action of the controllable heat transfer conversion furnace and the sulfur recovery acid making device, the equipment has the advantages of resource recycling and environmental protection, and solves the problems that the non-condensable gas often contains a certain amount of sulfide and other harmful gases, environmental pollution is caused if the non-condensable gas is directly discharged into the atmosphere, and the equipment is environment-friendly. Useful resources are wasted due to direct combustion in a torch.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas treatment technical field, concretely is a kind of ammonia-containing non-condensable gas external sending sulfur recovery equipment for making acid. BACKGROUND

[0002] In chemical production process, isothermal shift process is common chemical reaction process, a large amount of ammonia-containing non-condensable gas is produced in this process.

[0003] At present, these non-condensable gas often contains a certain amount of sulfide and other harmful gases, if directly discharged into atmosphere can cause environmental pollution, send into torch direct combustion wastes useful resources therein, for this, we propose a kind of ammonia-containing non-condensable gas external sending sulfur recovery equipment for making acid. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of ammonia-containing non-condensable gas external sending sulfur recovery equipment for making acid, with the advantages of resource recycling and environmental protection, solve the problem that non-condensable gas often contains a certain amount of sulfide and other harmful gases, if directly discharged into atmosphere can cause environmental pollution, send into torch direct combustion wastes useful resources therein.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of ammonia-containing non-condensable gas external sending sulfur recovery equipment for making acid, including controllable heat transfer shift converter, the bottom of the controllable heat transfer shift converter is communicated with gas pipe, the top of the controllable heat transfer shift converter is communicated with first flow guide pipe, the first flow guide pipe is communicated with non-condensable gas stripping separator at the end away from controllable heat transfer shift converter, the top of the non-condensable gas stripping separator is communicated with second flow guide pipe, the end away from non-condensable gas stripping separator of the second flow guide pipe is communicated with sulfuric acid steam condenser, the right end of the sulfuric acid steam condenser is communicated with sulfur recovery equipment for making acid, the outer surface of controllable heat transfer shift converter and non-condensable gas stripping separator and sulfuric acid steam condenser is all provided with heat exchange cover.

[0006] Preferably, the left end of the gas pipe is provided with a valve body.

[0007] Preferably, the front of the heat exchange cover is communicated with a conveying pipe, the end away from the heat exchange cover of the conveying pipe is provided with a pump, the rear end of the heat exchange cover is communicated with a liquid discharge pipe, the end away from the heat exchange cover of the liquid discharge pipe is communicated with a shunt box.

[0008] Preferably, the rear side of the shunt box is communicated with a shunt pipe, one end of which is provided with an adjusting valve.

[0009] Preferably, the heat exchange cover comprises an inner shell, a first thermal insulation layer, a second thermal insulation layer and an outer shell from inside to one side, and the second thermal insulation layer comprises a mineral fiber cotton layer and a nai-based heat insulation soft felt layer.

[0010] Preferably, the first and second heat preservation layers are made of the same material.

[0011] Preferably, the nanometer-based heat insulation soft felt layer is located between the two mineral fiber cotton layers.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1. The utility model discloses a recovery isothermal conversion procedure produces industrial waste gas, including ammonia containing noncondensable steam, can reduce environmental pollution, and make tail gas emission index reach national environmental protection requirement, and the process of burning ammonia containing noncondensable steam to prepare sulfuric acid not only realizes waste utilization, and reduces the production cost of enterprise.

[0014] 2. The utility model discloses a mineral fiber cotton layer and nanometer-based heat insulation soft felt layer's setting can improve the heat insulation performance of first and second heat preservation layers, through the setting of heat exchange cover, under the auxiliary of inner shell, first heat preservation layer, second heat preservation layer and outer shell, can improve the heat insulation performance of heat exchange cover, avoid the rapid loss of heat, improve the ratio of heat recovery, save energy. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the first visual angle structure schematic drawing of the utility model;

[0016] Figure 2 It is the second visual angle structure schematic drawing of the utility model;

[0017] Figure 3 It is the heat exchange cover structure schematic drawing of the utility model;

[0018] Figure 4 It is the second heat preservation layer structure schematic drawing of the utility model.

[0019] In the drawing: 1, controllable heat transfer converter;2, noncondensable gas stripping separator;3, conveying pipe;4, sulfuric acid steam condenser;5, sulfur recovery acid making device;6, pump machine;7, gas conveying pipe;8, first flow guide pipe;9, shunt box;10, second flow guide pipe;11, shunt pipe;12, heat exchange cover;121, inner shell;122, first heat preservation layer;123, second heat preservation layer;1231, mineral fiber cotton layer;1232, nanometer-based heat insulation soft felt layer;124, outer shell;13, valve body;14, liquid discharge pipe. DETAILED DESCRIPTION

[0020] 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 of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0021] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. 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.

[0023] The controllable heat transfer conversion furnace 1, the non-condensable gas stripping separator 2, the conveying pipe 3, the sulfuric acid vapor condenser 4, the sulfur recovery acid making device 5, the pump 6, the gas conveying pipe 7, the first flow guide pipe 8, the flow distribution box 9, the second flow guide pipe 10, the flow distribution pipe 11, the heat exchange cover 12, the inner shell 121, the first heat preservation layer 122, the second heat preservation layer 123, the mineral fiber cotton layer 1231, the soft felt layer 1232, the outer shell 124, the valve body 13 and the liquid discharge pipe 14 parts of the present application are all general standard parts or parts known to those skilled in the art, and their structures and principles can be known by the technical personnel through technical manuals or through conventional experimental methods.

[0024] Embodiment one

[0025] Please refer to Figures 1-4The utility model provides a technical scheme: a kind of ammonia containing non-condensable gas external sending sulfur recovery equipment for making acid, including controllable heat transfer converter 1, the bottom of controllable heat transfer converter 1 is communicated with gas pipe 7, the left end of gas pipe 7 is provided with valve body 13, the top of controllable heat transfer converter 1 is communicated with first flow guide pipe 8, the end of first flow guide pipe 8 away from controllable heat transfer converter 1 is communicated with non-condensable gas stripping separator 2, the top of non-condensable gas stripping separator 2 is communicated with second flow guide pipe 10, the end of second flow guide pipe 10 away from non-condensable gas stripping separator 2 is communicated with sulfuric acid steam condenser 4, the right end of sulfuric acid steam condenser 4 is communicated with sulfur recovery equipment for making acid 5, the outer surface of controllable heat transfer converter 1 and non-condensable gas stripping separator 2 and sulfuric acid steam condenser 4 is all provided with heat exchange cover 12, the front of heat exchange cover 12 is communicated with conveying pipe 3, the end of conveying pipe 3 away from heat exchange cover 12 is provided with pump 6, the rear end of heat exchange cover 12 is communicated with liquid discharge pipe 14, the end of liquid discharge pipe 14 away from heat exchange cover 12 is communicated with shunt box 9, the rear side of shunt box 9 is communicated with shunt pipe 11, and one end of shunt pipe 11 is provided with regulating valve.

[0026] Need to be explained, controllable heat transfer converter 1, non-condensable gas stripping separator 2, sulfuric acid steam condenser 4 and sulfur recovery equipment for making acid 5 in the present sulfur recovery equipment for making acid are all mature products that can be directly purchased in market, and the self-properties that the corresponding products have can be directly searched or corresponding literature is searched to direct product structure, so here is not described in detail.

[0027] The technical scheme is as follows: The wet-process sulfuric acid process uses H2S in acid gas as raw material to produce sulfuric acid products through a series of reactions, and its characteristic is wet-process technology.

[0028] The wet-process sulfuric acid process mainly includes the following process steps:

[0029] (1) acid gas combustion;

[0030] (2) SCR denitration reaction;

[0031] (3) SO2 catalytic oxidation;

[0032] (4) sulfuric acid steam condensation;

[0033] (5) sulfuric acid cooling and conditioning;

[0034] (6) heat recovery of the device;

[0035] (7) tail gas deep treatment.

[0036] The specific reaction principle and process are described as follows:

[0037] 1. Acid gas combustion

[0038] When the H2S concentration in the acid gas reaches a certain value, the combustion reaction can be maintained at a high temperature, and H2S can be completely converted to SO2:

[0039]

[0040] The combustion reaction is fast, and H2S can be completely converted to SO2 in a short time, while releasing heat.

[0041] If the acid gas contains trace amounts of CH3OH and hydrocarbon substances (CnHm), the following reactions will occur:

[0042]

[0043] The combustion reaction temperature is determined by the H2S concentration in the acid gas, the CnHm concentration, and the combustion air ratio. NH3 contained in the acid gas is also a combustible material, with an ignition point of about 651°C, and burns in an oxygen-rich environment, with the following reaction:

[0044] 4NH3 + 5O2 → 6H2O + 4NO + reaction heat (4)

[0045] 4NH3 + 7O2 → 6H2O + 4NO2 + reaction heat (5)

[0046] 2. SCR denitration reaction

[0047] 4NO + 4NH3 + O2 → 4N2 + 6H2O + reaction heat (6)

[0048] 6NO + 4NH3 → 5N2 + 6H2O + reaction heat (7)

[0049] When there is oxygen in the process gas, reaction (6) occurs preferentially, so the ammonia consumption is in an equivalent relationship with NO. In addition, under normal circumstances, there is still a small amount of NO2 in the process gas, which reacts as follows:

[0050] 2NO2 + 4NH3 + O2 → 3N2 + 6H2O + reaction heat (8)

[0051] 6NO2 + 8NH3 → 7N2 + 12H2O + reaction heat (9)

[0052] 3. SO2 catalytic oxidation

[0053]

[0054] In the above combustion reaction, SO2 obtained by burning H2S is catalytically converted into SO3, and reaction (10) is a chemical equilibrium reaction. Considering factors such as reaction rate and equilibrium conversion, the step reaction is carried out in stages, and the reaction heat is removed by inter-stage heat exchangers between stages to reduce the reaction temperature of the process gas, taking into account the reaction rate while improving the reaction equilibrium conversion.

[0055] It can be understood that the gas entering the controllable heat transfer reformer 1 through the gas pipe 7 is the gas after the combustion reaction, and the controllable heat transfer reformer 1 provides a stable and suitable reaction temperature environment for the SCR denitration system by adjusting the flue gas temperature. By precisely controlling the flue gas temperature, the controllable heat transfer reformer 1 helps to improve the efficiency of the SCR denitration system and ensures the smooth progress of the denitration reaction. The controllable heat transfer reformer 1 provides a suitable temperature environment to support the efficient operation of the SCR denitration system during combustion, but the actual denitration reaction is completed in the SCR reactor (not shown in the figure). The catalytic oxidation of SO2 in step 3 can be completed in the controllable heat transfer reformer 1, because the controllable heat transfer technology of the controllable heat transfer reformer 1 realizes heat transfer by adjusting the transformation of the medium, which has the advantages of high efficiency, energy saving, environmental protection, and strong controllability. This technology is widely used in the field of chemical industry, especially in the case of heating or cooling of reaction liquids, which can improve energy utilization efficiency and reduce environmental pollution.

[0056] 4. Sulfuric acid vapor condensation

[0057] H2O produced by the H2S combustion reaction (1) will react with SO3 obtained by catalytic conversion as follows:

[0058] SO3(g) + H2O(g) → H2SO4(g) + reaction heat (11)

[0059] Then the sulfuric acid vapor separated in the non-condensable gas stripper 2 is sent to the sulfuric acid vapor condenser 4 for cooling and condensation, while releasing condensation heat:

[0060] H2SO4(g) → H2SO4(l) + reaction heat (12)

[0061] 5. Sulfuric acid cooling and conditioning

[0062] The concentrated sulfuric acid produced by sulfuric acid vapor condensation has a high temperature, and is cooled to 40°C by mixing with cold sulfuric acid and heat exchange, and then sent out after cooling circulation.

[0063] 6. Heat recovery of the device

[0064] The above reactions 1-12 are all exothermic reactions, and the device uses heat exchanger 12 to produce saturated steam in the boundary zone and overheat the subsequent steam to remove the reaction heat of each stage, maintain the thermal balance of the equipment, and produce high-quality medium-pressure superheated steam as a byproduct.

[0065] 7. Deep exhaust gas treatment

[0066] Using 10wt% ammonia water as a reaction reagent, trace amounts of SO2 pollutants in the exhaust gas are removed, and sulfur oxides are converted into ammonium sulfite and ammonium bisulfite.

[0067] SO2(g) + NH3·H2O → NH4HSO3 + Heat of reaction (13)

[0068] SO2(g) + NH3·H2O → (NH4)2SO3(g) + heat of reaction (14)

[0069]

[0070] It should be noted that the deep treatment of exhaust gas is a step within the sulfur recovery and acid production unit, and is existing technology, as shown in the figure.

[0071] Example 2

[0072] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, the heat exchange cover 12 includes an inner shell 121, a first insulation layer 122, a second insulation layer 123 and an outer shell 124 from the inside to the outside. The second insulation layer 123 includes a mineral fiber cotton layer 1231 and a nano-based heat insulation soft felt layer 1232. The first insulation layer 122 and the second insulation layer 123 are made of the same material. The nano-based heat insulation soft felt layer 1232 is located between the two mineral fiber cotton layers 1231.

[0073] This technical solution: By setting the mineral fiber cotton layer 1231 and the nano-based heat insulation soft felt layer 1232, the heat insulation performance of the first insulation layer 122 and the second insulation layer 123 can be improved. By setting the heat exchange cover 12, with the assistance of the inner shell 121, the first insulation layer 122, the second insulation layer 123 and the outer shell 124, the heat insulation performance of the heat exchange cover 12 can be improved, avoiding rapid heat loss, increasing the heat recovery rate and saving energy.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. An ammonia-containing non-condensable gas external sulfur recovery acid making plant comprising a controllable heat removal converter (1), characterized in that: The bottom of the controllable heat transfer converter (1) is communicated with a gas conveying pipe (7), the top of the controllable heat transfer converter (1) is communicated with a first flow guide pipe (8), one end of the first flow guide pipe (8) away from the controllable heat transfer converter (1) is communicated with a non-condensable gas stripping separator (2), the top of the non-condensable gas stripping separator (2) is communicated with a second flow guide pipe (10), one end of the second flow guide pipe (10) away from the non-condensable gas stripping separator (2) is communicated with a sulfuric acid vapor condenser (4), the right end of the sulfuric acid vapor condenser (4) is communicated with a sulfur recovery acid making device (5), the outer surfaces of the controllable heat transfer converter (1), the non-condensable gas stripping separator (2) and the sulfuric acid vapor condenser (4) are all provided with heat exchange covers (12).

2. An ammonia-containing non-condensable gas externally fed sulphur recovery acid plant according to claim 1, characterized in that: The left end of the gas conveying pipe (7) is provided with a valve body (13).

3. An ammonia-containing non-condensable gas externally fed sulphur recovery acid plant according to claim 1, characterized in that: The front of the heat exchange cover (12) is communicated with a conveying pipe (3), one end of the conveying pipe (3) away from the heat exchange cover (12) is provided with a pump (6), the back end of the heat exchange cover (12) is communicated with a liquid discharge pipe (14), one end of the liquid discharge pipe (14) away from the heat exchange cover (12) is communicated with a shunt box (9).

4. An ammonia-containing non-condensable gas externally fed sulphur recovery acid plant according to claim 3, characterized in that: The back side of the shunt box (9) is communicated with a shunt pipe (11) with an adjusting valve arranged at one end.

5. An ammonia-containing non-condensable gas externally fed sulphur recovery acid plant according to claim 1, characterized in that: The heat exchange cover (12) comprises, from inside to outside, an inner shell (121), a first heat preservation layer (122), a second heat preservation layer (123) and an outer shell (124), the second heat preservation layer (123) comprises a mineral fiber cotton layer (1231) and a naki thermal insulation soft felt layer (1232).

6. An ammonia-containing non-condensable gas externally fed sulphur recovery acid plant according to claim 5, characterized in that: The first heat preservation layer (122) and the second heat preservation layer (123) are made of the same material.

7. An ammonia-containing non-condensable gas externally fed sulphur recovery acid plant according to claim 6, characterized in that: The naki thermal insulation soft felt layer (1232) is located between the two mineral fiber cotton layers (1231).

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