Device for automatically controlling chlorine and hydrogen flow ratio of hydrochloric acid synthesis furnace

Abstract

The utility model relates to the technical field of chemical engineering, provides an automatic chlorine-hydrogen flow ratio control device for a hydrochloric acid synthesis furnace, and solves the problem that the ratio of hydrogen to chlorine in the hydrochloric acid synthesis furnace cannot reach a theoretical set value due to design defects of the conventional device. Comprising a hydrochloric acid synthesis furnace, a hydrogen buffer tank and a chlorine buffer tank, the hydrogen buffer tank and the chlorine buffer tank are connected with the hydrochloric acid synthesis furnace, a hydrogen flow meter and a hydrogen purity detector are arranged between the hydrogen buffer tank and the hydrochloric acid synthesis furnace, and a chlorine flow meter and a chlorine purity detector are arranged between the chlorine buffer tank and the hydrochloric acid synthesis furnace. The online hydrogen purity detector and the chlorine purity detector are additionally arranged, the flow of hydrogen and chlorine is subjected to proportional control, the adding amount of hydrogen and chlorine is automatically adjusted, automatic adjustment is achieved, it is guaranteed that the ratio of hydrogen to chlorine reaches a theoretical set value, and then it is guaranteed that the concentration of finished hydrochloric acid is qualified.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to an automatic control device for the chlorine-hydrogen flow ratio of a hydrochloric acid synthesis furnace. Background Art

[0002] Chinese patent announcement number CN 209213444 U discloses a chlorine liquefaction system capable of saving alkali solution consumption, comprising an acid condenser, a dry chlorine pipeline, a chlorine compressor, a first raw chlorine distribution platform, a second tail chlorine distribution platform, a first tail chlorine circulating liquefaction pipeline, a raw chlorine pipeline, and a second tail chlorine circulating liquefaction pipeline, wherein the inlet end of the acid condenser is connected to a hydrochloric acid synthesis furnace, one end of the dry chlorine pipeline is connected to an air outlet of the acid condenser, the other end of the dry chlorine pipeline is connected to an air inlet of the chlorine compressor, the air outlet of the chlorine compressor is connected to a chlorine liquefaction mechanism through a first raw chlorine distribution platform, the chlorine liquefaction mechanism is connected to a second tail chlorine circulating liquefaction pipeline through a second tail chlorine distribution platform, the second tail chlorine circulating liquefaction pipeline is connected to a first tail chlorine circulating liquefaction pipeline through a raw chlorine pipeline, and the first tail chlorine circulating liquefaction pipeline is connected to the dry chlorine pipeline.

[0003] Industrial hydrochloric acid is produced by using a hydrochloric acid synthesis furnace, where chlorine and hydrogen are burned in the furnace to generate hydrogen chloride gas. When producing hydrochloric acid, the chlorine introduced into the hydrochloric acid synthesis furnace mainly comes from the original chlorine (≥98%) compressed by the chlorine compressor, and partly comes from the liquid chlorine tail gas (≥75%). The chlorine liquefaction system proposed in the utility model is used to treat the liquid chlorine tail gas to improve the efficiency of the liquid chlorine. However, during normal production of hydrochloric acid, the purity of the liquid chlorine tail gas is not fixed and will change with the self-regulation of the liquefaction device (such as air intake adjustment, heat exchange medium temperature adjustment, etc.). The chlorine liquefaction system proposed in the utility model also has this problem, resulting in the hydrogen and chlorine ratio in the hydrochloric acid synthesis furnace being unable to truly reach the theoretical set value, resulting in the purity of the hydrogen chloride gas produced by the hydrochloric acid synthesis furnace being unable to meet the index, and ultimately resulting in the concentration of the finished hydrochloric acid being unqualified. Utility Model Content

[0004] Therefore, in view of the above problems, the utility model provides a chlorine-hydrogen flow ratio automatic control device for a hydrochloric acid synthesis furnace, which solves the problem that the ratio of hydrogen to chlorine in the hydrochloric acid synthesis furnace cannot reach the theoretical set value due to design defects of the existing device.

[0005] In order to achieve the above object, the utility model is realized by the following technical solutions:

[0006] A hydrochloric acid synthesis furnace chlorine-hydrogen flow ratio automatic control device comprises a hydrochloric acid synthesis furnace, the hydrochloric acid synthesis furnace comprises a shell, a spacer cover is arranged in the shell, a spacer ring is arranged outside the spacer cover, the spacer ring divides the shell into an upper combustion chamber and a lower air intake chamber, a plurality of air intake pipes are arranged in the spacer cover, each of the air intake pipes communicates with the combustion chamber and the air intake chamber, a gas expansion port is arranged at the top of the spacer cover, each of the air intake pipes is arranged around the gas expansion port at intervals, a gas collecting cover is arranged in the combustion chamber, the bottom of the gas collecting cover extends into the gas expansion port, a plurality of gas collecting pipes are arranged in the gas collecting cover, and the top of each of the gas collecting pipes passes through the top of the gas collecting cover and the top of the shell;

[0007] It also includes a hydrogen buffer tank and a chlorine buffer tank connected to the hydrochloric acid synthesis furnace. A hydrogen flowmeter and a hydrogen purity detector are provided between the hydrogen buffer tank and the hydrochloric acid synthesis furnace, and a chlorine flowmeter and a chlorine purity detector are provided between the chlorine buffer tank and the hydrochloric acid synthesis furnace.

[0008] Furthermore, the hydrogen buffer tank is connected to each of the air inlet pipes, and the chlorine buffer tank is connected to each of the gas collecting pipes.

[0009] Furthermore, an air baffle plate is provided below the air collecting hood, and the air baffle plate is mounted on each of the air inlet pipes.

[0010] Furthermore, the cross section of the air blocking plate is V-shaped.

[0011] Furthermore, the cross-section of the bottom end of the air collecting hood gradually increases from top to bottom.

[0012] Furthermore, an air outlet is provided on the top of the shell.

[0013] Furthermore, an air intake ring and a plurality of connecting pipes are provided on the outside of the air intake cavity, the air intake cavity and the air intake ring are connected through the connecting pipes, and at least two air intake ports are provided on the air intake ring.

[0014] Furthermore, the ratio of the sum of the flow rates in each of the collecting pipes to the sum of the flow rates in each of the intake pipes is 1:1.05-1.2.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model forms proportional control on the flow of hydrogen and chlorine by adding online hydrogen purity detector and chlorine purity detector, automatically adjusts the amount of hydrogen and chlorine added, realizes automatic adjustment, ensures that the ratio of hydrogen and chlorine reaches the theoretical set value, and further ensures that the concentration of finished hydrochloric acid is qualified.

[0017] 2. The utility model adds an online hydrogen purity detector and a chlorine purity detector, which eliminates the need for manual analysis, saves labor costs and reduces the harm of sample testing to the human body.

[0018] 3. The utility model makes the hydrogen and chlorine introduced into the hydrochloric acid synthesis furnace fully contact and react by arranging the spacer cover, the spacer ring, the air inlet pipe, the air collecting cover and the air collecting pipe, thereby improving the generation rate of hydrogen chloride gas, reducing the burden of the tail gas treatment device, and saving energy and reducing consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of a hydrochloric acid synthesis furnace according to an embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of a hydrochloric acid synthesis furnace according to an embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the top view of the hydrochloric acid synthesis furnace according to an embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the air intake pipe structure of an embodiment of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the air blocking plate in an embodiment of the utility model;

[0025] Figure 7 It is a schematic diagram of the structure of the gas collecting hood according to an embodiment of the utility model.

[0026] Description of Figure Numbers

[0027] Hydrochloric acid synthesis furnace 1;

[0028] Shell 2; air outlet 21;

[0029] Spacer cover 3; air inlet pipe 31; air expansion port 32; connecting plate 33;

[0030] Spacer ring 4;

[0031] Combustion chamber 5; gas collecting cover 51; gas collecting pipe 52; air blocking plate 53;

[0032] Inlet cavity 6; Inlet ring 61; Connecting pipe 62; Inlet port 63;

[0033] Hydrogen buffer tank 7; hydrogen flow meter 71; hydrogen purity detector 72;

[0034] Chlorine gas buffer tank 8; chlorine gas flow meter 81; chlorine gas purity detector 82. DETAILED DESCRIPTION

[0035] The following will describe the implementation methods of the present invention in detail in conjunction with specific embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0036] Example

[0037] like Figures 1 to 7 As shown, a chlorine-hydrogen flow rate ratio automatic control device for a hydrochloric acid synthesis furnace comprises a hydrochloric acid synthesis furnace 1, wherein the hydrochloric acid synthesis furnace 1 comprises a shell 2, wherein the top of the shell 2 is provided with an air outlet 21, wherein a spacer cover 3 is provided inside the shell 2, wherein a spacer ring 4 is provided outside the spacer cover 3, wherein the spacer ring 4 divides the shell 2 into an upper combustion chamber 5 and a lower air intake chamber 6, wherein a plurality of air intake pipes 31 are provided inside the spacer cover 3, wherein each of the air intake pipes 31 communicates with the combustion chamber 5 and the air intake chamber 6, wherein an air expansion port 32 is provided at the top of the spacer cover 3, wherein each of the air intake pipes 31 is spaced around the air expansion port 32, wherein an air collecting cover 51 is provided inside the combustion chamber 5, wherein the bottom of the air collecting cover 51 extends into the air expansion port 32, wherein a plurality of air collecting pipes 52 are provided inside the air collecting cover 51, wherein the top end of each of the air collecting pipes 52 passes through the top of the air collecting cover 51 and the top of the shell 2;

[0038] It also includes a hydrogen buffer tank 7 and a chlorine buffer tank 8 connected to the hydrochloric acid synthesis furnace 1, a hydrogen flowmeter 71 and a hydrogen purity detector 72 are provided between the hydrogen buffer tank 7 and the hydrochloric acid synthesis furnace 1, and a chlorine flowmeter 81 and a chlorine purity detector 82 are provided between the chlorine buffer tank 8 and the hydrochloric acid synthesis furnace 1;

[0039] The hydrogen flow meter 71, hydrogen purity detector 72, chlorine flow meter 81 and chlorine purity detector 82 can all be purchased from the market and will not be described in detail here;

[0040] The present application does not specifically limit the number of the air intake pipes 31 and the air collecting pipes 52. The numbers are adjusted according to the actual situation. In this embodiment, the number of the air intake pipes 31 is twelve, and the number of the air collecting pipes 52 is two.

[0041] By adding an online hydrogen purity detector 72 and a chlorine purity detector 82, the flow rates of hydrogen and chlorine are proportionally controlled, the amount of hydrogen and chlorine added is automatically adjusted, and automatic adjustment is achieved to ensure that the ratio of hydrogen and chlorine reaches the theoretical set value, thereby ensuring that the concentration of finished hydrochloric acid is qualified; by adding an online hydrogen purity detector 72 and a chlorine purity detector 82, the frequency of manual analysis is not required, which saves labor costs and reduces the harm of sample testing to the human body;

[0042] By arranging the spacer cover 3, the spacer ring 4, the air inlet pipe 31, the air collecting cover 51 and the air collecting pipe 52, the hydrogen gas introduced into the hydrochloric acid synthesis furnace 1 is fully contacted and reacted with the chlorine gas, thereby increasing the generation rate of hydrogen chloride gas, reducing the burden of the tail gas treatment device, and saving energy and reducing consumption;

[0043] The cross section of the bottom end of the gas collecting hood 51 gradually increases from top to bottom, so as to diffuse the chlorine in the gas collecting hood 51 as much as possible so that it can fully react with the hydrogen. A baffle plate 53 is provided below the gas collecting hood 51, and the baffle plate 53 is mounted on each of the air inlet pipes 31, and the cross section of the baffle plate 53 is V-shaped; a connecting plate 33 is provided between each of the air inlet pipes 31, and each of the connecting plates 33 is arranged around the gas collecting hood 51;

[0044] By setting the air blocking plate 53, part of the chlorine gas flowing out from the bottom of the gas collecting cover 51 is blocked by the air blocking plate 53 and flows upward, while part of the chlorine gas flows into the spacer cover 3 along the gaps between the air inlet pipes 31, and flows upward after contacting the bottom of the shell 2, thereby increasing the retention time of the chlorine gas in the shell. Due to the setting of the connecting plate 33, the chlorine gas flowing upward flows out from the gap between the gas collecting cover 51 and the connecting plate 33, thereby increasing the contact area between the chlorine gas and the hydrogen gas.

[0045] An intake ring 61 and four connecting pipes 62 are provided outside the intake cavity 6. The intake cavity 6 and the intake ring 61 are connected through the connecting pipes 62. Two intake ports 63 are provided on the intake ring 61. The arrangement of the intake ring 61 can ensure that the flow rate of hydrogen flowing into each intake pipe 31 is consistent.

[0046] The hydrogen buffer tank 7 is connected to each of the intake pipes 31 and each of the connecting pipes 62 via an intake ring 61, and the chlorine buffer tank 8 is connected to each of the collecting pipes 52; the ratio of the sum of the flow rates in each of the collecting pipes 52 to the sum of the flow rates in each of the intake pipes 31 is 1:1.05-1.2.

[0047] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A chlorine-hydrogen flow rate ratio automatic control device for a hydrochloric acid synthesis furnace, comprising a hydrochloric acid synthesis furnace, characterized in that: The hydrochloric acid synthesis furnace comprises a shell, a spacer cover is arranged in the shell, a spacer ring is arranged on the outer side of the spacer cover, the spacer ring divides the shell into an upper combustion chamber and a lower air intake chamber, a plurality of air intake pipes are arranged in the spacer cover, each of the air intake pipes connects the combustion chamber and the air intake chamber, an air expansion port is arranged at the top of the spacer cover, each of the air intake pipes is arranged around the air expansion port at intervals, an air collecting cover is arranged in the combustion chamber, the bottom of the air collecting cover extends into the air expansion port, a plurality of air collecting pipes are arranged in the air collecting cover, and the top of each of the air collecting pipes passes through the top of the air collecting cover and the top of the shell; It also includes a hydrogen buffer tank and a chlorine buffer tank connected to the hydrochloric acid synthesis furnace. A hydrogen flowmeter and a hydrogen purity detector are provided between the hydrogen buffer tank and the hydrochloric acid synthesis furnace, and a chlorine flowmeter and a chlorine purity detector are provided between the chlorine buffer tank and the hydrochloric acid synthesis furnace.

2. The automatic control device for the ratio of chlorine to hydrogen flow in a hydrochloric acid synthesis furnace according to claim 1, characterized in that: The hydrogen buffer tank is connected to each of the air inlet pipes, and the chlorine buffer tank is connected to each of the gas collecting pipes.

3. The automatic control device for the ratio of chlorine to hydrogen flow in a hydrochloric acid synthesis furnace according to claim 1, characterized in that: An air blocking plate is arranged below the air collecting hood, and the air blocking plate is mounted on each of the air inlet pipes.

4. The automatic control device for the ratio of chlorine to hydrogen flow in a hydrochloric acid synthesis furnace according to claim 3, characterized in that: The cross section of the air blocking plate is V-shaped.

5. The automatic control device for the ratio of chlorine to hydrogen flow in a hydrochloric acid synthesis furnace according to claim 1, characterized in that: The cross section of the bottom end of the gas collecting hood gradually increases from top to bottom.

6. The automatic control device for the ratio of chlorine to hydrogen flow in a hydrochloric acid synthesis furnace according to claim 1, characterized in that: An air outlet is arranged on the top of the shell.

7. The automatic control device for the ratio of chlorine to hydrogen flow in a hydrochloric acid synthesis furnace according to claim 1, characterized in that: An air intake ring and a plurality of connecting pipes are arranged outside the air intake cavity. The air intake cavity and the air intake ring are communicated with each other through the connecting pipes. The air intake ring is provided with at least two air intake ports.

8. The automatic control device for the ratio of chlorine to hydrogen flow in a hydrochloric acid synthesis furnace according to claim 1, characterized in that: The ratio of the sum of the flow rates in each of the collecting pipes to the sum of the flow rates in each of the intake pipes is 1:1.05-1.2.

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