Tail chlorine utilization device of hydrogen chloride graphite synthesis furnace

Abstract

The utility model relates to a tail chlorine utilization device of a hydrogen chloride graphite synthesis furnace, which comprises a chlorine buffer tank and a graphite synthesis furnace, a pure chlorine conveying pipeline is arranged between the top of the chlorine buffer tank and the bottom of the graphite synthesis furnace, and the chlorine buffer tank is provided with a pure chlorine inlet. The tail end of the pressure supplementing branch is connected with a tail chlorine buffer tank, the tail chlorine buffer tank is provided with a tail chlorine inlet and a pure chlorine inlet connected with the pressure supplementing branch, a tail chlorine conveying pipeline is arranged between the top of the tail chlorine buffer tank and the bottom of the graphite synthesis furnace, and the tail ends of the pure chlorine conveying pipeline and the tail chlorine conveying pipeline are intersected and communicated with the graphite synthesis furnace; the pure chlorine conveying pipeline is provided with a first flow meter in front of the intersection, and the tail chlorine conveying pipeline is provided with a second flow meter in front of the intersection. The device balances tail chlorine generated in the starting and stopping stages of a chlor-alkali plant, improves the chlor-alkali production load, generates hydrochloric acid for sale, and increases economic benefits.

Description

Technical Field

[0001] The utility model relates to the technical field of polyvinyl chloride production equipment, in particular to a chlorine utilization device at the tail end of a hydrogen chloride graphite synthesis furnace. Background Art

[0002] At present, the domestic polyvinyl chloride industry mainly produces polyvinyl chloride through suspension polymerization of calcium carbide acetylene, in which acetylene and hydrogen chloride gas react in the converter to produce crude vinyl chloride. The crude vinyl chloride is compressed after water washing and alkali washing, and then enters the full condenser for cooling, and then enters the tail gas condenser for deep cooling. The condensed liquid enters the water separator and the coarse tank, and after pressure distillation in the low-boiling point tower and the high-boiling point tower, it is condensed into liquid monomer through the finished product condenser and enters the monomer tank.

[0003] However, the following problems exist in the production process: hydrogen chloride gas is generated by the combustion of hydrogen and chlorine sent from the chlor-alkali plant at the graphite furnace lamp head. The low-concentration chlorine gas (hereinafter referred to as tail chlorine) produced during the start-up and shutdown stages of the chlor-alkali plant needs to be recovered and processed in the downstream process, otherwise it will cause waste of resources. Utility Model Content

[0004] The purpose of the utility model is to provide a device for utilizing chlorine at the tail end of a hydrogen chloride graphite synthesis furnace to solve the above-mentioned problem, balance the tail chlorine generated during the start-up and shutdown stages of a chlor-alkali plant, increase the chlor-alkali production load, avoid wasting resources, and at the same time generate hydrochloric acid for sale, thereby increasing economic benefits.

[0005] The technical solution of the utility model is:

[0006] A device for utilizing tail chlorine in a hydrogen chloride graphite synthesis furnace comprises a chlorine buffer tank and a graphite synthesis furnace, wherein a pure chlorine gas delivery pipeline is provided between the top of the chlorine buffer tank and the bottom of the graphite synthesis furnace, and the chlorine buffer tank is provided with a pure chlorine gas inlet for receiving pure chlorine gas from a chlor-alkali plant. The technical key points are: a pressure-compensating branch is provided on the pure chlorine gas delivery pipeline, the end of the pressure-compensating branch is connected to the tail chlorine buffer tank, the tail chlorine buffer tank is provided with a pure chlorine gas inlet connected to the pressure-compensating branch and a tail chlorine gas inlet for receiving tail chlorine gas from the chlor-alkali plant, a tail chlorine delivery pipeline is provided between the top of the tail chlorine buffer tank and the bottom of the graphite synthesis furnace, the pure chlorine gas delivery pipeline and the end of the tail chlorine delivery pipeline intersect and are connected to the graphite synthesis furnace, a first flowmeter is provided on the pure chlorine gas delivery pipeline before the intersection, and a second flowmeter is provided on the tail chlorine delivery pipeline before the intersection.

[0007] The above-mentioned hydrogen chloride graphite synthesis furnace tail chlorine utilization device has a first drain port at the bottom of the chlorine buffer tank, a first pressure measuring port, a first safety valve port and a first chlorine absorption port connected to the chlorine absorption tower at the top.

[0008] The above-mentioned hydrogen chloride graphite synthesis furnace tail chlorine utilization device has a second drain port at the bottom of the tail chlorine buffer tank, a second pressure measuring port, a second safety valve port and a second chlorine absorption port connected to the chlorine absorption tower at the top.

[0009] In the above-mentioned hydrogen chloride graphite synthesis furnace tail chlorine utilization device, the chlorine buffer tank is provided with a heating interlayer, the bottom of the heating interlayer is provided with a hot water inlet, and the upper part is provided with a hot water outlet.

[0010] In the above-mentioned hydrogen chloride graphite synthesis furnace tail chlorine utilization device, the tail chlorine buffer tank is provided with a heating interlayer, the bottom of the heating interlayer is provided with a hot water inlet, and the top is provided with a hot water outlet.

[0011] In the above-mentioned hydrogen chloride graphite synthesis furnace tail chlorine utilization device, a first thermocouple is provided in the chlorine buffer tank.

[0012] In the above-mentioned hydrogen chloride graphite synthesis furnace tail chlorine utilization device, a second thermocouple is provided in the tail chlorine buffer tank.

[0013] The beneficial effects of the utility model are:

[0014] This utility model adds a tail chlorine buffer tank. When tail chlorine is generated during the start-up and shutdown phases of the chlor-alkali plant, the tail chlorine is received from the chlor-alkali plant and transported to the graphite synthesis furnace through a tail chlorine delivery pipeline. Simultaneously, pure chlorine gas is transported to the graphite synthesis furnace through a pure chlorine delivery pipeline. The ratio is adjusted using a first flowmeter, a second flowmeter, and a control valve to achieve the purpose of simultaneously burning pure chlorine and tail chlorine. The tail chlorine is mixed with high-concentration pure chlorine gas and, in a specific ratio, undergoes a combustion reaction with hydrogen in the graphite synthesis furnace to produce low-concentration hydrogen chloride, which is then absorbed with water to produce hydrochloric acid. This not only balances the tail chlorine, increasing the chlor-alkali production load, but also produces hydrochloric acid for sale, increasing economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a process flow chart of the utility model.

[0016] In the figure: 1. pure chlorine inlet, 2. chlorine buffer tank, 3. first chlorine absorption port, 4. pure chlorine delivery pipeline, 5. pressure supplement branch, 6. tail chlorine inlet, 7. hot water inlet, 8. hot water outlet, 9. hot water inlet, 10. hot water outlet, 11. tail chlorine buffer tank, 12. second chlorine absorption port, 13. tail chlorine delivery pipeline, 14. second flowmeter, 15. graphite synthesis furnace, 16. first flowmeter. DETAILED DESCRIPTION

[0017] The utility model is described in detail according to the accompanying drawings.

[0018] like Figure 1As shown, the chlorine utilization device at the tail end of a hydrogen chloride graphite synthesis furnace includes a chlorine buffer tank 2 and a graphite synthesis furnace 15. A pure chlorine delivery pipeline 4 is provided between the top of the chlorine buffer tank 2 and the bottom of the graphite synthesis furnace 15. The chlorine buffer tank 2 is provided with a pure chlorine inlet 1 for receiving pure chlorine from the chlor-alkali plant. A control valve N1 is installed at the pure chlorine inlet. A control valve N2 is installed at the beginning of the pure chlorine delivery pipeline 4, and a control valve N4 is installed at the end.

[0019] Wherein: the pure chlorine gas delivery pipeline 4 is provided with a pressure-compensating branch 5, the end of the pressure-compensating branch 5 is connected to the tail chlorine buffer tank 11, a control valve N5 is provided on the pressure-compensating branch 5, the tail chlorine buffer tank 11 is provided with a pure chlorine gas inlet connected to the pressure-compensating branch 5 and a tail chlorine gas inlet 6 for receiving tail chlorine gas from the chlor-alkali plant, and a control valve N6 is provided at the tail chlorine gas inlet 6.

[0020] A tail chlorine delivery pipeline 13 is provided between the top of the tail chlorine buffer tank 11 and the bottom of the graphite synthesis furnace 15. A control valve N7 is provided at the starting section of the tail chlorine delivery pipeline 13, and a control valve N9 is provided at the tail end. The pure chlorine gas delivery pipeline 4 and the tail chlorine delivery pipeline 13 intersect at their ends and are connected to the graphite synthesis furnace 15. A first flowmeter 16 is provided before the intersection of the pure chlorine gas delivery pipeline 4, and a second flowmeter 14 is provided before the intersection of the tail chlorine delivery pipeline 13. In this embodiment, the first flowmeter 16 is located between the control valve N4 and the starting point of the pressure compensation branch 5, and the second flowmeter 14 is located between the control valves N7 and N9.

[0021] In this embodiment, the chlorine buffer tank 2 is provided with a first drain port F at the bottom, a first pressure measuring port P, a first safety valve port A, and a first chlorine absorption port 3 connected to the chlorine absorption tower at the top, and a control valve N3 is provided at the first chlorine absorption port 3. The tail chlorine buffer tank 11 is provided with a second drain port F1 at the bottom, a second pressure measuring port P1, a second safety valve port A1, and a second chlorine absorption port 12 connected to the chlorine absorption tower at the top, and a control valve N8 is provided at the second chlorine absorption port 12.

[0022] The chlorine buffer tank 2 is equipped with a heating interlayer with a hot water inlet 7 at the bottom and a hot water outlet 8 at the top. The tail chlorine buffer tank 11 is equipped with a heating interlayer with a hot water inlet 9 at the bottom and a hot water outlet 10 at the top. A first thermocouple T is installed in the chlorine buffer tank 2. A second thermocouple T1 is installed in the tail chlorine buffer tank 11.

[0023] Working principle:

[0024] During the production process, pure chlorine and hydrogen sent from the chlor-alkali plant are pressure-stabilized in the chlorine buffer tank 2 and the hydrogen buffer tank before entering the lamp head of the graphite synthesis furnace 15 for combustion, where they react to generate hydrogen chloride gas. When tail chlorine is generated during the start-up and shutdown phases of the chlor-alkali plant, the tail chlorine from the chlor-alkali plant is received and delivered to the graphite synthesis furnace 15 via the tail chlorine delivery pipeline 13. When the pressure in the tail chlorine buffer tank 11 is low, the control valve N5 is opened to replenish the pressure in the tail chlorine buffer tank 11. When the furnace is just started, the control valve N4 needs to be opened to ignite the furnace with pure chlorine. The amount of pure chlorine and tail chlorine entering the graphite synthesis furnace 15 is then controlled by the control valves N9, N4, the first flowmeter 16, and the second flowmeter 14. A combustion reaction occurs within the graphite synthesis furnace 15, producing low-concentration hydrogen chloride, which is then absorbed with water to produce hydrochloric acid.

[0025] The above detailed description of the embodiments of the present invention is intended to be a preferred embodiment of the present invention and should not be construed as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made within the scope of the present invention shall still fall within the scope of this patent.

Claims

1. A chlorine utilization device at the tail end of a hydrogen chloride graphite synthesis furnace, comprising a chlorine buffer tank and a graphite synthesis furnace, wherein a pure chlorine delivery pipeline is provided between the top of the chlorine buffer tank and the bottom of the graphite synthesis furnace, and the chlorine buffer tank is provided with a pure chlorine inlet for receiving pure chlorine from a chlor-alkali plant, characterized in that: A pressure-compensating branch is provided on the pure chlorine gas delivery pipeline, and the end of the pressure-compensating branch is connected to a tail chlorine buffer tank. The tail chlorine buffer tank is provided with a pure chlorine gas inlet connected to the pressure-compensating branch and a tail chlorine gas inlet for receiving tail chlorine gas from the chlor-alkali plant. A tail chlorine delivery pipeline is provided between the top of the tail chlorine buffer tank and the bottom of the graphite synthesis furnace. The pure chlorine gas delivery pipeline and the end of the tail chlorine delivery pipeline intersect and are connected to the graphite synthesis furnace. A first flow meter is provided on the pure chlorine gas delivery pipeline before the intersection, and a second flow meter is provided on the tail chlorine delivery pipeline before the intersection.

2. The chlorine utilization device at the tail end of the hydrogen chloride graphite synthesis furnace according to claim 1, characterized in that: The chlorine buffer tank is provided with a first drain port at the bottom, and a first pressure measuring port, a first safety valve port and a first chlorine absorption port connected to the chlorine absorption tower at the top.

3. The chlorine utilization device at the tail end of the hydrogen chloride graphite synthesis furnace according to claim 1, characterized in that: The tail chlorine buffer tank is provided with a second drain port at the bottom, and a second pressure measuring port, a second safety valve port and a second chlorine absorption port connected to the chlorine absorption tower at the top.

4. The chlorine utilization device at the tail end of a hydrogen chloride graphite synthesis furnace according to claim 1, characterized in that: The chlorine buffer tank is provided with a heating interlayer, a hot water inlet is provided at the bottom of the heating interlayer, and a hot water outlet is provided at the top.

5. The chlorine utilization device at the tail end of the hydrogen chloride graphite synthesis furnace according to claim 1, characterized in that: The tail chlorine buffer tank is provided with a heating interlayer, a hot water inlet is provided at the bottom of the heating interlayer, and a hot water outlet is provided at the top.

6. The chlorine utilization device at the tail end of the hydrogen chloride graphite synthesis furnace according to claim 1, characterized in that: A first thermocouple is provided in the chlorine buffer tank.

7. The chlorine utilization device at the tail end of the hydrogen chloride graphite synthesis furnace according to claim 1, characterized in that: A second thermocouple is provided in the tail chlorine buffer tank.

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