Integrated small cold box with double liquid pumps and double expansion machines

Abstract

The utility model discloses an integrated small cold box with double liquid pumps and double expansion machines, which comprises a main cold box, an expansion machine gap bridge cold box and a liquid pump gap bridge cold box, the expansion machine gap bridge cold box and the liquid pump gap bridge cold box are respectively fixed on two adjacent side walls of the main cold box, two groups of expansion systems are arranged in the expansion machine gap bridge cold box, and the expansion systems are respectively connected with the expansion machine gap bridge cold box and the liquid pump gap bridge cold box. Two sets of pumping systems are arranged in the liquid pump gap bridge cold box, the main cold box is at least matched with one expansion system and one pumping system to operate, two sets of expansion machine bodies and pipelines of the expansion machine bodies are uniformly and intensively arranged in the expansion machine gap bridge cold box, and two sets of liquid pump bodies and pipelines of the liquid pump bodies are uniformly and intensively arranged in the liquid pump gap bridge cold box. The expansion machine bridge cooling box and the liquid pump bridge cooling box are separated through the partition plates, the expansion machine bodies and the liquid pump bodies can be used and standby respectively, continuous and stable operation of equipment is guaranteed, the expansion machine bridge cooling box and the liquid pump bridge cooling box are separated through the partition plates, and the adjacent expansion machine bodies and the adjacent liquid pump bodies can be placed independently.

Description

Technical Field

[0001] The utility model relates to the technical field of high-nitrogen air separation, in particular to an integrated small cold box with a double liquid pump and a double expander. Background Art

[0002] In recent years, with the rapid development of high-tech industries such as semiconductors, optoelectronics, and new energy in China, the demand for high-purity nitrogen has been increasing day by day, which has promoted the rise of domestic small high-nitrogen air separation processes. Among them, the double-column process with a liquid pump is particularly numerous. In the design of the cold box of the conventional double-column process with a liquid pump, in order to save the manufacturing cost of production, equipment manufacturers often integrate a single expander and a single liquid pump in a cross-over cold box, resulting in the inability to perform maintenance without shutting down the machine when the expander or the liquid pump fails;

[0003] In the later production process, in order to achieve maintenance without shutting down the machine when the expander or the liquid pump fails, an additional cross-over cold box needs to be added to achieve one standby for the expander and the liquid pump. However, this leads to a complex pipeline connection between the expander and the liquid pump, and it is easy for operators to make misoperations, resulting in inconvenient maintenance. Therefore, the utility model discloses an integrated small cold box with a double liquid pump and a double expander to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an integrated small cold box with a double liquid pump and a double expander to solve the problem that in order to achieve maintenance without shutting down the machine when the expander or the liquid pump fails, an additional cross-over cold box needs to be added to achieve one standby for the expander and the liquid pump, which leads to a complex pipeline connection between the expander and the liquid pump, and it is easy for operators to make misoperations, resulting in inconvenient maintenance as mentioned in the above background art.

[0005] To achieve the above purpose, the solution of the utility model to solve the above technical problems is as follows:

[0006] An integrated small cold box with a double liquid pump and a double expander includes a main cold box, an expander cross-over cold box, and a liquid pump cross-over cold box. The expander cross-over cold box and the liquid pump cross-over cold box are respectively fixed on two adjacent side walls of the main cold box. The expander cross-over cold box is internally provided with two groups of expansion systems, and the liquid pump cross-over cold box is internally provided with two groups of pumping systems. The main cold box operates in cooperation with at least one expansion system and one pumping system.

[0007] As a further scheme of the utility model, the expansion system at least includes an expander body and its pipelines.

[0008] As a further scheme of the utility model, the pumping system at least includes a liquid pump body and its pipelines.

[0009] As a further solution of the present utility model, a first partition is embedded in the middle of the expansion engine cross-over cold box, and the two groups of expansion systems are respectively located on both sides of the first partition.

[0010] As a further solution of the present utility model, a second partition is embedded in the middle of the liquid pump cross-over cold box, and the two groups of pumping systems are respectively located on both sides of the second partition.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. The integrated small cold box of the double liquid pumps and double expansion engines of the present utility model has the two groups of expansion engine bodies and their pipelines uniformly and centrally arranged in the expansion engine cross-over cold box, and the two groups of liquid pump bodies and their pipelines uniformly and centrally arranged in the liquid pump cross-over cold box, so that the expansion engine body and the liquid pump body can both achieve a relationship of one in use and one in reserve, ensuring the continuous and stable operation of the equipment;

[0013] 2. The integrated small cold box of the double liquid pumps and double expansion engines of the present utility model has the middle parts of the expansion engine cross-over cold box and the liquid pump cross-over cold box separated by partitions, and the adjacent expansion engine bodies and adjacent liquid pump bodies can be placed separately, enabling the pipelines to be separately arranged without interference, and making it easier for subsequent separate maintenance work of the liquid pumps and expansion engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present utility model will be further described below with reference to the drawings and embodiments:

[0015] Figure 1 FIG. is the external view of an integrated small cold box of a double liquid pump and a double expansion engine of the present utility model.

[0016] In the drawings, the list of components represented by each reference numeral is as follows:

[0017] 1, main cold box; 2, expansion engine cross-over cold box; 21, first partition; 3, liquid pump cross-over cold box; 31, second partition; 4, expansion system; 5, pumping system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model will be further described below with reference to the embodiments.

[0019] Please refer to Figure 1 , the present utility model provides an integrated small cold box of a double liquid pump and a double expansion engine, including a main cold box 1, an expansion engine cross-over cold box 2 and a liquid pump cross-over cold box 3. The expansion engine cross-over cold box 2 and the liquid pump cross-over cold box 3 are respectively fixed on two adjacent side walls of the main cold box 1;

[0020] Specifically, placing the expansion engine cross-over cold box 2 and the liquid pump cross-over cold box 3 closer to each other makes it easier to connect the pipelines and also reduces the trouble of walking back and forth during maintenance.

[0021] Further, two sets of expansion systems 4 are built inside the expander crossover cold box 2. The expansion system 4 at least includes an expander body and its pipelines. A first partition 21 is embedded in the middle of the expander crossover cold box 2, and the two sets of expansion systems 4 are respectively located on both sides of the first partition 21;

[0022] Specifically, the first partition 21 physically isolates the two sets of expansion systems 4, reduces the mutual interference between them, and improves the stability of the system. When maintenance or repair is required for one of the expansion systems 4, the first partition 21 can provide certain protection to avoid affecting the other set of operating systems.

[0023] Further, two sets of pumping systems 5 are built inside the liquid pump crossover cold box 3. The pumping system 5 at least includes a liquid pump body and its pipelines. A second partition 31 is embedded in the middle of the liquid pump crossover cold box 3, and the two sets of pumping systems 5 are respectively located on both sides of the second partition 31;

[0024] Specifically, the second partition 31 physically isolates the two sets of pumping systems 5, reduces the mutual interference between them, and improves the stability of the system. When maintenance or repair is required for one of the pumping systems 5, the second partition 31 can provide certain protection to avoid affecting the other set of operating systems.

[0025] Further, the main cold box 1 operates in cooperation with at least one expansion system 4 and one pumping system 5;

[0026] Specifically, by having one expansion system 4 and one pumping system 5 in a standby mode, during the later production process, it is possible to perform non-stop maintenance on the expander or liquid pump in case of a failure.

[0027] Working principle: During use, the operating states of the two sets of expansion systems 4 can be switched, and the operating states of the two sets of pumping systems 5 can be switched, which is convenient for the maintenance of the expansion system 4 or pumping system 5 after they are shut down.

Claims

1. An integrated small cold box of a dual-liquid pump and a dual-expander, comprising a main cold box (1), an expander crossover cold box (2) and a liquid pump crossover cold box (3). The expander crossover cold box (2) and the liquid pump crossover cold box (3) are respectively fixed on two adjacent side walls of the main cold box (1), and it is characterized in that, The expansion engine cross-over cold box (2) is internally provided with two sets of expansion systems (4), the liquid pump cross-over cold box (3) is internally provided with two sets of pumping systems (5), and the main cold box (1) operates in cooperation with at least one expansion system (4) and one pumping system (5).

2. The integrated small cold box of a dual liquid pump and a dual expander according to claim 1, characterized in that: The expansion system (4) at least includes an expansion engine body and its pipelines.

3. The integrated small cold box of a dual liquid pump and a dual expander according to claim 1, characterized in that: The pumping system (5) at least includes a liquid pump body and its pipelines.

4. An integrated small cold box of a dual liquid pump and a dual expander according to claim 1, characterized in that: A first partition plate (21) is embedded in the middle of the expansion engine cross-over cold box (2), and the two sets of expansion systems (4) are respectively located on both sides of the first partition plate (21).

5. An integrated small cold box of a dual liquid pump and a dual expander according to claim 1, characterized in that: A second partition plate (31) is embedded in the middle of the liquid pump cross-over cold box (3), and the two sets of pumping systems (5) are respectively located on both sides of the second partition plate (31).

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