Salt-containing waste liquid and waste gas heat treatment device

Abstract

The utility model discloses a salt-containing waste liquid and waste gas heat treatment device which comprises a hearth a and a waste heat boiler and further comprises a hearth b, the hearth a, the hearth b and the waste heat boiler are vertically arranged in parallel, the side face of the lower portion of the hearth a is connected with the lower end of the hearth b through an inclined pipe, the hearth b is communicated with the upper end of the waste heat boiler, and a top cover is arranged at the upper end of the hearth a. A burner a is installed on the top cover, a slag discharging pool is arranged at the lower end of the hearth a, an annular air bellow a is concentrically installed on the upper portion of the hearth a, the inner side of the air bellow a is communicated to the hearth a through a through hole in the side wall of the hearth a, and a plurality of inwards-inserted waste liquid spray guns are evenly arranged on the outer wall of the air bellow a along the circumference. An annular air bellow b is fixedly installed in the middle of the hearth b, a plurality of waste gas spray guns are installed on the air bellow b, and the air bellow b is located above the combustor b.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater and waste gas treatment, in particular to a heat treatment device for saline waste liquid and waste gas. Background Technique

[0002] With the improvement of environmental protection requirements, in many chemical production processes, various types of saline waste liquids are often discharged, including high-concentration waste liquids and waste water with a small amount of organic waste liquids. In many cases, organic waste gases are also discharged simultaneously. At present, there are many devices for treating saline organic waste liquids by incineration. A relatively typical example is Patent CN115682000A - A saline organic waste liquid incinerator, which adopts a vertical U-shaped furnace chamber. The flue gas after the saline waste liquid is incinerated from top to bottom enters the upper-stage waste heat boiler. This layout structure is compact and efficient, but the biggest problem is that the slag discharge process is prone to blockage, affecting the long-term operation of the furnace. Patent CN218787558U - A high-saline organic waste liquid incineration device adopts a two-stage furnace chamber, and the lower slag outlet adopts solid slag discharge, but the incineration treatment efficiency is not high, and blockage also occurs. At present, the problem of slag discharge blockage is common in saline waste liquid furnaces. In many cases, in order to avoid blockage of the slag discharge port, a supplementary combustion burner is added nearby to increase the outlet temperature to make the slag molten to avoid blockage, but the effect is not obvious. The existence of negative pressure makes the liquid slag and ash slag at the lower slag outlet position unable to fall into the lower slag pool in time. It seriously affects the operation cycle. Generally, the furnace needs to be shut down for treatment every 3 - 10 days. If the waste liquid and waste gas are incinerated simultaneously, the waste gas needs to be treated separately during the furnace shutdown period, increasing the cost. Content of the Utility Model

[0003] The purpose of the utility model is to provide a heat treatment device for saline waste liquid and waste gas to solve the problems put forward in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A heat treatment device for saline waste liquid and waste gas, including furnace chamber a and waste heat boiler. The lower port of furnace chamber a1 is the lower slag outlet. It also includes furnace chamber b. The furnace chamber a, furnace chamber b, and waste heat boiler are arranged vertically and parallel to each other. The lower side of the lower part of furnace chamber a is connected to the lower end of furnace chamber b through an inclined pipe. The upper ends of furnace chamber b and the waste heat boiler are connected and communicated. Both furnace chamber a and furnace chamber b are cylindrical structures. The upper end of furnace chamber a is provided with a top cover, and a burner a is installed on the top cover. A lower slag pool is arranged at the lower end of furnace chamber a. An annular air box a is concentrically installed in the upper part of furnace chamber a. The inner side of air box a is connected to furnace chamber a through a through hole on the side wall of furnace chamber a. A plurality of waste liquid spray guns inserted inward are evenly arranged along the circumference on the outer wall of air box a. The front end of the waste liquid spray gun is inserted into the through hole. A burner b is installed at the bottom of the side of furnace chamber b. An annular air box b is fixedly installed in the middle of furnace chamber b. A plurality of waste gas spray guns are installed on air box b. Air box b is located above burner b.

[0005] Preferably, the number of the waste liquid spray guns is less than that of the through holes, and the through holes are inclined holes with a lower inner part and a higher outer part.

[0006] Preferably, the lower end of the waste heat boiler is connected to a horizontal ash discharging section, and a vertical chimney is installed on the upper side of the other end of the ash discharging section.

[0007] Preferably, heat exchangers are installed in the furnace b, the waste heat boiler and the chimney, and a horizontal distribution plate 11 is installed in the inner cavity of the furnace b6.

[0008] Compared with the prior art, the beneficial effects of the present utility model are as follows: adopting a two-stage vertical furnace mode, the furnace a is a reduction furnace responsible for treating the salt-containing waste liquid, and it is a positive-pressure furnace. At this stage, after the combustion gasification reaction of the salt-containing waste liquid, it is all converted into reducing gas, and the salt-containing slag is discharged into the water seal slag pool at the bottom of the furnace in a liquid state under positive pressure, avoiding blockage caused by cooling and covering at the slag discharging port. The reducing gas enters the furnace b obliquely through a pipe. The furnace b serves as a thermal oxidation furnace, and thermal reactions occur with the incoming waste gas, supplementary combustion fuel gas and air and are completely treated, realizing the environmental protection and efficient treatment of waste liquid and waste gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic structural diagram of the present utility model;

[0010] Figure 2 It is an installation schematic diagram of the air box a and the waste liquid spray gun on the furnace a.

[0011] In the figure: 1, furnace a; 2, burner a; 3, air box a; 4, slag pool; 5, waste liquid spray gun; 6, furnace b; 7, waste heat boiler; 8, ash discharging section; 9, chimney; 10, burner b; 11, distribution plate; 12, air box b; 13, heat exchanger; 14, through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0013] Please refer to Figure 1-2 , the present utility model provides a technical solution: a heat treatment device for salt-containing waste liquid and waste gas, including a furnace a1 and a waste heat boiler 7. The lower port of the furnace a1 is a slag discharging port. It further includes a furnace b6. The furnace a1, the furnace b6 and the waste heat boiler 7 are arranged vertically and parallel to each other. The lower part side of the furnace a1 is connected to the lower end of the furnace b6 through an inclined pipe. The upper ends of the furnace b6 and the waste heat boiler 7 are communicated with each other. The furnace a1 and the furnace b6 are both cylindrical structures, and the upper end of the furnace a1 is provided with a top cover.

[0014] A burner a2 is installed on the top cover. A slagging pit 4 is provided at the lower end of the furnace a1. A certain height of water is poured into the slagging pit 4. A sewage valve is installed at the lower end of the slagging pit 4 ( Figure 1 not shown in the figure). An annular air box a3 is concentrically installed in the upper part of the furnace a1. The outer air inlet of the air box a3 is used to connect to a blower. The inner side of the air box a3 is connected to the furnace a1 through a through hole 14 on the side wall of the furnace a1. A plurality of waste liquid spray guns 5 inserted inward are evenly arranged along the circumference on the outer wall of the air box a3. The front end of the waste liquid spray gun 5 is inserted into the through hole 14. The number of the waste liquid spray guns 5 is less than that of the through holes 14. The through holes 14 are inclined holes with a lower inner side and a higher outer side. The waste liquid spray guns 5 are used to spray the waste liquid to be treated into the furnace a1. The plurality of waste liquid spray guns 5 spray obliquely downward in a centripetal manner.

[0015] The burner a2 serves as a heat source for stabilizing combustion and can use natural gas with stable calorific value, etc. to provide the initial heat source and the heat required for the reduction reaction of the waste liquid. The oxygen supplied by the burner a2 and the air box a3 is not sufficient to oxidize C and H in the waste liquid into CO2 and H2O, but it ensures that the gasification reduction reaction can continue, and all C and H in the waste liquid are converted into gases such as CO, H2, CO2, and H2O. The furnace a1, as a gasification reduction furnace, should maintain a positive pressure state. It is recommended that the positive pressure value be between 10 and 100 KPa. A positive pressure state of the furnace is more conducive to the progress of the reduction reaction and the efficient combustion reaction of the waste liquid; the molten slag generated falls into the slagging pit 4. The steam generated by the contact between the high-temperature molten slag and the water in the water seal is directly discharged to the inclined pipe under the action of the positive pressure along with the reducing flue gas, avoiding the blockage caused by the contact and cooling of the water vapor and the molten slag at the slag outlet. The positive pressure brings the reducing flue gas with calorific value into the furnace b6 (i.e., the oxidation reaction furnace), avoiding the occurrence of backfire. At the same time, the positive pressure furnace will reduce the size of the equipment.

[0016] A burner b10 is installed at the bottom side of the furnace b6. A transverse distribution plate 11 is installed in the inner cavity of the furnace b6. The distribution plate 11 is a circular plate and is provided with a number of round holes. After the air flow passes through the distribution plate 11, uniform divergence is achieved. The burner b10 is used for afterburning the waste gas. An annular air box b12 is fixedly installed in the middle of the furnace b6. The air box b12 has the same structure as the air box a3 and is used to provide the oxygen required for the oxidation reaction. A plurality of waste gas spray guns are installed on the air box b12. The air box b12 is located above the burner b10. The lower end of the waste heat boiler 7 is connected to a transverse ash discharge section 8. The ash discharge section 8 is a section of pipeline. A flip-type or push-pull type ash removal door is provided on the lower side of the pipeline. The ash discharge section 8 is used to accumulate and discharge the ash and slag in the flue gas. A vertical chimney 9 is installed on the upper side of the other end of the ash discharge section 8. Heat exchangers 13 are installed in the furnace b6, the waste heat boiler 7, and the chimney 9.

[0017] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A heat treatment device for waste gas from a salt-containing waste liquid, comprising a furnace a (1) and a waste heat boiler (7), characterized in that: It further includes a furnace b (6). The furnace a (1), the furnace b (6) and the waste heat boiler (7) are arranged vertically and parallel to each other. The lower side of the furnace a (1) is connected to the lower end of the furnace b (6) through an inclined pipe. The upper ends of the furnace b (6) and the waste heat boiler (7) are communicated with each other. Both the furnace a (1) and the furnace b (6) are cylindrical structures. The upper end of the furnace a (1) is provided with a top cover, and a burner a (2) is installed on the top cover. The lower end of the furnace a (1) is provided with a slagging pit (4). An annular air box a (3) is concentrically installed in the upper part of the furnace a (1). The inner side of the air box a (3) is connected to the furnace a (1) through a through hole (14) on the side wall of the furnace a (1). A plurality of waste liquid spray guns (5) inserted inward are uniformly arranged on the outer wall of the air box a (3) along the circumference. The front end of the waste liquid spray gun (5) is inserted into the through hole (14). A burner b (10) is installed at the bottom of the side of the furnace b (6). An annular air box b (12) is fixedly installed in the middle of the furnace b (6). A plurality of waste gas spray guns are installed on the air box b (12). The air box b (12) is located above the burner b (10).

2. The heat treatment device for waste gas from saline waste liquid according to claim 1, wherein: The number of the waste liquid spray guns (5) is less than the number of the through holes (14). The through holes (14) are inclined holes with a lower inner side and a higher outer side.

3. The heat treatment device for waste gas from saline waste liquid according to claim 2, wherein: The lower end of the waste heat boiler (7) is connected to a horizontal ash discharging section (8), and a vertical chimney (9) is installed on the upper side of the other end of the ash discharging section (8).

4. An apparatus for heat treatment of waste gas from a salt-containing waste liquid according to claim 3, characterized in that: Heat exchangers (13) are installed in the furnace b (6), the waste heat boiler (7) and the chimney (9). A horizontal distribution plate (11) is installed in the inner cavity of the furnace b (6).

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