Ammonia washing device

Abstract

According to the ammonia washing device, heat exchange is carried out on absorption units one by one through external heat exchangers connected in parallel, the ammonia washing efficiency is improved, the concentration of ammonia water obtained after ammonia gas of an upper section is absorbed is improved through the set height of the upper filler section, and the effect that ammonia water of a lower section rapidly reaches the set concentration can be achieved. And the standard requirements of industrial ammonia water are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to ammonia gas absorption device technical field, concretely is a kind of ammonia washing device. BACKGROUND

[0002] Ammonia gas containing exhaust gas is generated in the process of synthetic ammonia, and ammonia gas is oxidized to form NOx in the atmosphere, form acid rain, and further oxidized to nitrate, enter water cycle system, pollute groundwater. Ammonia is an important raw material for agriculture and chemical industry, and recycling ammonia in ammonia gas containing exhaust gas is an important link for industrial production to improve economic benefit and environmental benefit.

[0003] The prior art usually uses ammonia washing tower for absorption, ammonia-containing waste gas enters the ammonia washing tower absorption zone through the bottom flue gas inlet, soft water enters the ammonia washing tower absorption zone from the upper part of the ammonia washing tower, and the waste gas and the soft water are fully contacted in the absorption zone. Ammonia in waste gas is absorbed by water, and accumulates in the storage area at the bottom of the ammonia washing tower. When it is about to be full, the transportation of soft water and waste gas is stopped. At this time, if the ammonia water concentration reaches the standard, the ammonia water is transported to the ammonia water storage device. If the ammonia water concentration does not reach the standard, the waste gas is continuously transported, but the water sprayed by the spraying device at this time comes from the ammonia water that does not reach the standard, and continues to dissolve ammonia gas until the ammonia water concentration reaches the standard.

[0004] Disadvantages of the prior art: ammonia gas dissolving in water is an exothermic reaction, and the higher the temperature of ammonia water, the more difficult it is to absorb ammonia gas. The prior art does not take this factor into account, so the efficiency of the recovery device for recycling ammonia gas in waste gas is not high, and the concentration of ammonia water obtained is also difficult to meet the requirements of industrial sales.

[0005] Therefore, it is necessary to provide an ammonia washing device to solve the defects of low ammonia washing efficiency and low ammonia water concentration of the existing absorption device. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing an ammonia washing device to solve the defects of low ammonia washing efficiency and low ammonia water concentration of the existing absorption device.

[0007] Therefore, the utility model provides the following scheme:

[0008] An ammonia washing device includes an absorption tower for reverse absorption of ammonia gas containing gas from bottom to top. An upper section of the absorption tower is provided with an absorption unit, and a lower section is provided with a plurality of absorption units connected in series. Each absorption unit includes a liquid distributor, a filler and a support plate arranged from top to bottom. Heat exchangers are connected in parallel between any adjacent absorption units outside the absorption tower. The filler height in the upper section of the absorption tower is greater than or equal to the sum of the filler heights in the lower section.

[0009] Further, the lower section of the absorption tower is provided with three absorption units connected in series.

[0010] Further, the input end of the heat exchanger is arranged above the support plate, and the output end is communicated to the adjacent liquid distributor below.

[0011] Further, all the heat exchange medium channels of the heat exchanger are connected in parallel.

[0012] Further, the bottom of the absorption tower is provided with an ammonia gas pipe and a pressure gauge; the top of the absorption tower is provided with an absorption liquid pipe, and the absorption liquid pipe is provided with a control valve one; the control valve one is interlocked with the pressure gauge.

[0013] Further, the bottom of the absorption tower is provided with an ammonia gas pipe and a pressure gauge; the top of the absorption tower is provided with an absorption liquid pipe, and the absorption liquid pipe is provided with a control valve one; the control valve one is interlocked with the pressure gauge.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The ammonia washing device improves the ammonia washing efficiency by arranging the external parallel heat exchanger to heat the absorption units one by one, and improves the ammonia water concentration after the ammonia gas absorption of the upper section by arranging the height of the upper section filler section, so that the ammonia water of the lower section can quickly reach the set concentration to meet the standard requirements of industrial ammonia water. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The utility model provides a kind of ammonia washing device overall schematic view.

[0017] Wherein: 100, first absorption unit;200, second absorption unit;300, third absorption unit;400, fourth absorption unit;E1, heat exchanger one, E2, heat exchanger two;E3, heat exchanger three;T1, absorption tower;L1, ammonia gas pipe;L2, ammonia water output pipe;L3, absorption liquid pipe;L4, circulating water inlet pipe;L5, circulating water return pipe;LT1, liquid level meter, LD1, liquid distributor;F1, filler;SP1, support plate;P1, delivery pump;PT1, pressure gauge;K1, control valve one;K2, control valve two. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0019] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not 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.

[0020] It should be further understood that unless otherwise explicitly specified and limited, the terms "mounting", "communication", "connection", "fixing", "setting" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication or interaction relationship between two components. 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.

[0021] In one embodiment, as shown in Figure 1 An ammonia washing device is provided, which comprises an absorption tower T1, an ammonia gas pipe L1 arranged at the bottom of the absorption tower T1, and an absorption liquid pipe L3 arranged at the top of the absorption tower T1 and used for reverse absorption of ammonia-containing gas from bottom to top. The upper section of the absorption tower T1 is provided with a first absorption unit 100, and the lower section is provided with a second absorption unit 200, a third absorption unit 300 and a fourth absorption unit 400. Taking the first absorption unit 100 as an example, each absorption unit comprises a liquid distributor LD1, a filler F1 and a support plate SP1 arranged from top to bottom. Heat exchangers are connected in parallel outside the absorption tower T1 between any adjacent absorption units. The height of the filler in the first absorption unit of the absorption tower T1 is greater than or equal to the sum of the heights of the fillers in all absorption units in the lower section.

[0022] In the above embodiment, the ammonia washing device is provided with heat exchangers connected in parallel outside the absorption tower T1 to heat each absorption unit, thereby improving the ammonia washing efficiency. The height of the filler in the upper section is set to improve the ammonia water concentration after ammonia gas absorption in the upper section, so that the ammonia water in the lower section can quickly reach the set concentration to meet the standard requirements of industrial ammonia water.

[0023] In the preferred embodiment, the first absorption unit 100, the support plate is provided with a pipeline connected to the heat exchanger E1 outside, and further connected to the liquid distributor in the second absorption unit 200; the second absorption unit 200, the support plate is provided with a pipeline connected to the heat exchanger E2 outside, and further connected to the liquid distributor in the third absorption unit 300; the third absorption unit 300, the support plate is provided with a pipeline connected to the heat exchanger E3 outside, and further connected to the liquid distributor in the fourth absorption unit 400. By the above layer-by-layer external parallel heat exchanger, the next stage of ammonia water can be cooled by the heat exchanger, and returned to the upper stage absorption unit by the action of its own liquid level static pressure difference, so as to continue to contact with the upward ammonia gas in the filler, promote the absorption of ammonia gas, and improve the absorption efficiency.

[0024] In the more preferred embodiment, the ammonia washing device is connected with an external circulating water pipeline, and the circulating water inlet pipe L4 is connected to the heat exchange medium layer input end of the heat exchanger E1, the heat exchanger E2 and the heat exchanger E3 through branch pipes after being connected from the outside, and the heat exchange medium layer output end is collected to the circulating water return pipe L5 through branch pipes, so as to realize the parallel connection of the heat exchange medium layer of the heat exchanger E1, the heat exchanger E2 and the heat exchanger E3, and improve the heat exchange efficiency of each heat exchanger.

[0025] In the preferred embodiment, the ammonia gas pipe L1 is provided with a pressure gauge PT1; the control valve K1 is arranged on the absorption liquid pipe L3, and the control valve K1 is interlocked with the pressure gauge PT1, so as to realize the proportional control of the ammonia gas inlet amount and the absorption liquid inlet amount.

[0026] In the preferred embodiment, the absorption tower T1 is provided with an ammonia water output pipe L2 and a liquid level meter LT1; the ammonia water output pipe L2 is connected with a delivery pump P1, and the output end of the delivery pump P1 is provided with a control valve K2; the control valve K2 is interlocked with the liquid level meter LT1, so as to control the output amount of ammonia water according to the liquid level height of the absorption tower T1.

[0027] In the above embodiment, the crystallization device further comprises other valves, instruments and meters commonly used in the art, and the setting and function thereof belong to the conventional means, which will not be described here.

[0028] Since the ammonia gas absorption process is an exothermic process, the ammonia washing device in the above embodiment is cooled to a suitable temperature, such as 37℃, by the external setting of each heat exchanger, so as to improve the ammonia gas absorption efficiency; through the step-by-step reverse absorption of desalted water and ammonia gas, the ammonia water concentration at the bottom of the absorption tower can quickly reach the industrial ammonia water concentration standard.

[0029] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ammonia washing installation comprising an absorption column (T1) for countercurrent absorption of an ammonia-containing gas from below; characterized in that, The upper section of the absorption tower (T1) is provided with an absorption unit, and the lower section is provided with a plurality of absorption units in series, each absorption unit comprising a liquid distributor, a packing and a support plate arranged from top to bottom; a heat exchanger is connected in parallel outside the absorption tower (T1) between any adjacent absorption units; the packing height in the upper section of the absorption tower (T1) is greater than or equal to the sum of the packing heights in the lower section.

2. The apparatus of claim 1, wherein The lower section of the absorption tower (T1) is provided with three absorption units in series.

3. The apparatus of claim 1 wherein, The input end of the heat exchanger is arranged above the support plate, and the output end is communicated to the liquid distributor below.

4. The apparatus of claim 1 wherein, The heat exchange medium channels of all the heat exchangers are connected in parallel.

5. A device for washing ammonia as claimed in claim 1, characterized in that The bottom of the absorption tower (T1) is provided with an ammonia gas pipe (L1) provided with a pressure gauge (PT1); the top of the absorption tower (T1) is provided with an absorption liquid pipe (L3) provided with a control valve one (K1); the control valve one (K1) is interlocked with the pressure gauge (PT1).

6. A device for washing ammonia as claimed in claim 1, characterized in that The bottom of the absorption tower (T1) is provided with an ammonia water output pipe (L2) and a liquid level gauge (LT1); the ammonia water output pipe (L2) is communicated with a delivery pump (P1), and the output end of the delivery pump (P1) is provided with a control valve two (K2); the control valve two (K2) is interlocked with the liquid level gauge (LT1).

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